Patent/Utility Model Document Display | J-PlatPat [JPP]
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`JP,05-292696,A(1993)
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`Primary document | SA)
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`* NOTICE *
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`JPO and INPIT are not responsible for any damages caused by the use of this
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`translation.
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`1. This document has been translated by computer. So the translation may not reflect
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`the original precisely.
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`2. **** Shows a word which cannot be translated.
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`3. In the drawings, any words are not translated.
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`(19) [Publication country] JP
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`(12) [Kind of official gazette] A
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`(11) [Publication number] 05292696
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`(43) [Date of publication of application] 19931105
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`(54) [Title of the invention] DC BRUSHLESS MOTOR
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`(51) [International Patent Classification 5th Edition]
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`HO2K 3/50
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`HO2K 21/22
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`HO2K 29/00
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`(21) [Application number] 04088648
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`Page 2 of 25
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`(22) [Filing date] 19920409
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`(71) [Applicant]
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`[Name] DAIKIN IND LTD
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`(72) [Inventor]
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`[Full name] OCHI JOJI
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`(57) [Overview ]
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`PURPOSE: To improvea structure for connecting a stator with the pattern circuit
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`of a printed board, in a DC brushless motor.
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`CONSTITUTION: The terminals of flexible wires 49 are connected with the connec
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`tors mounted on a printed board 21 respectively. Receptacles 50 are inserted into
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`coil terminal pins 19 through inserting holes and are connected with them respect
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`ively, and flexible wires 49 are routed to the pattern surface of the printed board
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`21. Concurrently, the intermediate parts of the flexible wires 49 are inserted into
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`rubber bushings through slits and held in place.
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`Page 3 of 25
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`8
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`woettet:
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` eC,9BS,
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`40
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`[Patent Claims]
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`[Claim 1] A rotor (8) having a shaft member (4), a stator (7) which has a pluralit
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`y of magnetic pole parts (7 b) and is externally fitted to the shaft member (4) wit
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`h a predetermined gap therebetween, and a plurality of magnetic pole pieces (1
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`Page 4 of 25
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`3) made of a permanent magnet, and a rotor () which is externally fitted to the st
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`ator (7) with a predetermined gap therebetween ; This DC brushless motor is pro
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`vided with a printed circuit board 21 which is arranged opposite to one end face o
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`f the stator 7 and the rotor 8 and has a driving circuit for controlling the energizin
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`g of the coil 18 of the stator 7.
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`A coil terminal pin (19) projecting toward the printed circuit board (21) is provide
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`d on the stator (7), and an insertion hole (21 c) corresponding to the coil terminal
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`pin (19) is formed on the printed circuit board (21). A connector (45,46) is attach
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`ed to the terminal processing pattern circuit of the coil (18), and a terminal of on
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`e end of the flexible wire (49) is connected to the connector (45,46), and the oth
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`er end of the electric wire (49) detoured to the pattern surface of the printed circ
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`uit board (21) is provided. A DC brushless motor is characterized in that a recept
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`acle (50) which is inserted into the insertion hole (21 c) and which can be plugge
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`d into the coil terminal pin (19) is mounted, and a rubber bush (25) with a slit for
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`holding an intermediate portion of the wire (49) is mounted on the printed circuit
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`board (21).
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`[Detailed description of the invention]
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`[0001]
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`[Industrial field of application] The present invention relates to a DC brushless m
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`otor used for driving a fan of an indoor air conditioner.
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`[0002]
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`[Prior art] Conventionally, an AC induction motor for changing the number of win
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`dings and changing the rotation speed has been used for driving such a fan. How
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`ever, the AC induction motor has a drawback that it is inefficient, does not satisfy
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`the requirement of energy saving, and is large in size. Therefore, in recent years,
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`a DC brushless motor has begun to be employed instead of an AC induction moto
`r.
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`[0003]As shown in FIG. 13, in this DC brushless motor, an output shaft 53 is rota
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`tably supported by a housing 51 via a bearing 52, and a stator 54 which has a plu
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`rality of magnetic pole portions around which a coil is wound and which is externa
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`lly fitted on an output shaft 53 with a predetermined gap is integrally fixed in ah
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`ousing by a resin mold (see hatching in the drawing). A rotor casing 57 in which a
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`permanent magnet 58 obtained by magnetizing an annular magnet material to a
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`plurality of poles is fitted and fitted to a stator 54 with a gap is press-fitted into a
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`knurled part of an output shaft 53 at a boss part 57 a at the center.
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`[0004]Then, when a plurality of magnetic pole portions of the inner stator 54 are
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`sequentially excited, an outer permanent magnet 58 is sequentially attracted tot
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`he magnetized magnetic pole portion, the rotor casing 57 rotates, and this rotatio
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`n is transmitted to the output shaft 53 via the boss portion 57 a, whereby the out
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`put shaft 53 rotates.
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`[0005]
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`[Problem to be solved by the invention] However, since the DC brushless motor i
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`ncorporates a driving circuit in an electric motor, it is necessary to mold a resin, r
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`esulting in a higher cost. Moreover, since there is no fin for heat radiation of the
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`driving IC and the temperature of the IC rises, it is necessary to keep the output
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`of the motor small.
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`[OO06]A stator which has a shaft member and a plurality of magnetic pole parts a
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`nd is externally fitted to the shaft member with a predetermined gap therebetwee
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`n ; There has been proposed a DC brushless motor having a plurality of magnetic
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`pole pieces made of a permanent magnet, and a printed circuit board having a ro
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`tor which is externally fitted to the stator with a predetermined gap therebetwee
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`n, and a drive circuit which is disposed opposite one end of the stator and which c
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`ontrols energization of the stator coil.
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`[0007 ]In this DC brushless electric motor, a printed circuit board is fixed to an en
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`d bracket in a housing or a housing by a clip or the like. Since it is not necessary
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`to mold the resin mold as described above and the housing or the end bracket ca
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`n be used for heat radiation of the driving IC, it is possible to reduce the size and
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`cost of the electric motor.
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`[OOO8]It is therefore an object of the present invention to provide a DC brushless
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`motor in which a connecting structure between a stator and a pattern circuit of a
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`printed circuit board is improved.
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`[0009]
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`[Means for solving the problem] To achieve the above object, the present inventi
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`on provides a rotor 8 having a shaft member 4, a stator 7 having a plurality of m
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`agnetic pole portions 7 b and externally fitted to the shaft member 4 with a prede
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`termined gap therebetween, and a plurality of magnetic pole pieces 13 made of a
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`permanent magnet, and a rotor which is externally fitted to the stator 7 with a pr
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`edetermined gap therebetween. This DC brushless motor is provided with a printe
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`d circuit board 21 which is arranged opposite to one end face of the stator 7 andt
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`he rotor 8 and has a driving circuit for controlling energization of the coil 18 of th
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`e stator 7. A coil terminal pin 19 projecting toward the printed circuit board 21 is
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`provided on the stator 7, and a plug 45,46 c corresponding to the coil terminal pi
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`n 19 is formed on the printed circuit board 21, and a connector is attached to a te
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`rminal processing pattern circuit of the coil 18. 21 A terminal of one end of the fle
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`xible cable 49 is connected to the connector 45,46, and the other end of the elect
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`ric wire 49 detoured to the pattern surface of the printed circuit board 21 is provi
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`ded. A receptacle 50 which is fitted into the insertion hole 21 ¢c and can be plugge
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`d and connected to the coil terminal pin 19 is mounted, and a rubber bush with sl
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`it 25 which holds an intermediate part of the electric wire 49 is mounted on the p
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`rinted circuit board 21.
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`[0010]
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`[Action and effect] According to the direct current brushless motor of the present
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`invention, the terminal of the flexible electric wire 4 is connected to the connector
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`45,46 mounted on the printed circuit board 21, and this flexible electric wire 49 is
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`connected.
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`A 9 is detoured to a pattern surface of a printed circuit board 21, a receptacle 50
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`is inserted and connected from an insertion hole 21 c to a coil terminal pin 19, an
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`d an intermediate part of a flexible wire 49 is inserted into a rubber bush 25 thro
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`ugh a slit 25 c and held by a rubber bush 25. Thus, even if the stator 7 vibrates d
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`ue to cogging, the vibration is absorbed by the flexible electric wire 49 and is not
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`transmitted to the printed circuit board 21 side, so that adverse effects such as vi
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`bration of the Hall element 42 for magnetic flux detection attached to the printed
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`circuit board 21 can be prevented.
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`[0011]Further, since the terminal of the flexible electric wire 49 can be connected
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`to the connector 45,46, melting of the insulating coating such as when the electri
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`c wire 49 is soldered and connected can be prevented. Further, since the receptac
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`le 50 of the flexible cable 49 can be plugged into the coil terminal pin 19 of the st
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`ator 7, the connection operation can be easily performed.
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`[0012]Further, since the intermediate portion of the flexible wire 49 can be held o
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`nly by inserting the intermediate portion of the flexible wire 49 into the slit 25 co
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`f the rubber bush 25, it is possible to easily perform the holding work and to prev
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`ent the flexible wire 21 from being broken or damaged at the outer peripheral ed
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`ge portion of the printed circuit board 1. Moreover, since the vibration of the flexi
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`ble electric wire 49 is absorbed by the rubber bush 25, the vibration is not transm
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`itted from the rubber bush 25 to the printed circuit board 21.
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`[0013]
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`[Examples] Hereinafter, the present invention is described in detail according to a
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`n illustrated Example. FIG. 1 is a cross-sectional view showing an example of a D
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`C brushless motor used for driving a fan of an indoor air conditioner.
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`[0014]This DC brushless electric motor has a bottomed cylindrical end bracket 3 f
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`itted and fixed to a vibration isolating rubber 2 mounted on an inner peripheral su
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`rface of a cylindrical housing 1, and a central shaft (shaft member) 4 projected b
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`y press fitting into a center hole 3 a of the end bracket 3. A stator 7 having a ma
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`gnetic pole part 7 b and externally fitted and fixed to the central shaft 4 via a fixe
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`d seat 5 and a vibration-proof rubber cylinder 6 ; This rotor is constituted of a rot
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`or 8 externally fitted to the stator 7 with a slight clearance, and a bearing housin
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`g 9 fixed to a front end plate 8 a of the rotor 8 by a rivet 11 together with an ext
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`ernally fitted vibration isolating rubber joint 10 and rotatably mounted on a centr
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`al shaft 4 of the rotor 8.
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`[0015]The rotor 8 is provided at a position 4 equal equally on the circumference
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`of the inner peripheral surface of the rotor casing 12. A magnetic pole piece 13 m
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`ade of 4 permanent magnets is mounted, a rotor yoke 14 is externally fitted at a
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`rear end of the rotor casing 12, and the pole piece 13 is formed in an arc shape al
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`ong an inner peripheral surface of the rotor casing 12, and an inner peripheral fac
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`e is formed in an arc shape along an outer peripheral surface of the stator 7. The
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`casing 12 and the yoke 14 are fixed by an adhesive 15 filled in the through hole.
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`[0016]A bearing holding ring 16 a is formed at the center of a bottom plate 16 co
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`rresponding to a front end plate 12 a of the rotor 8 of the rotor casing 8, and 4 of
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`them are formed from an outer periphery toward a center.
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`A part is punched radially and inwardly, and 4 pressing spring pieces 16 b for hol
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`ding the pole piece 13 from the inside in the radial direction are formed.
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`[0017]A stator 7 arranged with a gap in the rotor casing 12 comprises a boss par
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`t 7 a and 6 magnetic pole parts 7 b projecting radially outward from the boss part
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`7 aina radial direction, and a coil 18 is wound on each magnetic pole part 7 b, a
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`nd an outer peripheral surface of the magnetic pole part 7 b faces the inner perip
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`heral surface of the magnetic pole piece 13 with a slight gap. In the boss portion
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`7 a, an axial hole corresponding to the position of each magnetic pole portion 7 b
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`is provided, and a coil terminal pin 19 for connecting the coil 18 to the printed cir
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`cuit board 21 is supported in the hole.
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`[0018]The vibration damping rubber cylinder 6 is non-rotatably fitted into the bos
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`Ss portion 7 a of the stator 7, and the vibration damping rubber cylinder 6 is fitted
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`into the fixed seat 5 press-fitted into the central shaft 4 by a key 5 a So as not to
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`be rotatable. A vibration damping rubber disc 20 is fitted in front of the vibration
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`damping rubber cylinder 6 of the central shaft 4, with a slight clearance and abutt
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`ing against the front end of the coil terminal pin 19. The vibration damping rubbe
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`r cylinder 6 and the vibration damping rubber disk 20 are interposed in order to p
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`revent the magnetic flux generated in the coil 18 from becoming sinusoidal due t
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`o the simplification of the structure of the magnetic pole portion 7 b, and thus to
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`prevent the cogging generated in the stator 7 from being transmitted to the drive
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`n fan 40 via the central shaft 4 and the bearing housing 9.
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`[0019]A 2 bearing 32 is fitted in a bearing holding ring 12 a of a bottom plate 16
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`of the rotor casing 16, and a washer 31, a 1 bearing 30 and an intermediate seat
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`33 are housed in the bearing housing 9. The bearing housing 9 is slidably mounte
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`d between the retaining rings 34 a, 34 b of the central shaft 4 with the rotor 8 co
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`upled thereto by the rivet 11. A fixing ring 35 is press-fitted into the center shaft
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`4 at the rear of the retaining ring 34 b, and sandwiches the vibration damping ru
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`bber cylinder 6 and the vibration isolating rubber disk 20 between the fixing seat
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`5 and the center axis.
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`[0020]A vibration isolating rubber joint 10 is fitted on an outer periphery of the b
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`earing housing 9, a flange part of the vibration isolating rubber joint 10 is fixed to
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`a bottom plate 16 of the rotor 8 by a rivet 11, and a center hole of a blind plate 4
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`1 of the fan 40 is fitted and fixed to an outer peripheral surface of the vibration is
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`olating rubber joint 10. Accordingly, when the rotor 8 rotates, the fan 40 is rotate
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`d via the vibration isolation rubber joint 10.
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`[0021]On the other hand, as shown in FIG. 3, on the end bracket 3, 6 long holes
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`3 b for projecting the coil terminal pins 19 of the stator 7 toward the printed circu
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`it board 21 side are provided on the outer peripheral side of the central hole 3 ao
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`f the bottom plate portion at 6 equally divided positions on the same circumferen
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`ce. 3 3 square holes 21 c for projecting the tip 43 a of the Hall element holder 43
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`mounted on the printed circuit board 3 between the stator 7 and the rotor 8 are p
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`rovided at appropriate positions on the same circumference. On the outer periphe
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`ral side of the square hole 3 c, 4 positioning holes 3 d are provided at appropriate
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`positions on the same circumference, and a corner part between the bottom plate
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`part on the outer peripheral side of the positioning hole 3 d and the peripheral wa
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`Il part is provided.
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`4 spring insertion holes 3 corresponding to the respective positioning holes 3 d ar
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`e provided. In the peripheral wall portion, there are provided 2 locking holes 2fi
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`nto which a part of the inner peripheral surface of the vibration isolating rubber 3
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`enters.
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`[0022]As shown in FIG. 1, the printed circuit board 21 is disposed facing the bott
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`om plate portion of the end bracket 3 and is formed in a disk shape having a sligh
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`tly smaller diameter than the bottom plate portion. A surface of the printed circuit
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`board 21 on the bottom plate portion side is a part mounting surface 21 a, and a
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`n opposite surface is a pattern surface 21 b.
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`[0023]As shown in FIG. 4, a printed circuit board 21 is provided. 6 elongated hole
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`s 3 c corresponding to the respective elongated holes 3 b of the bottom plate port
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`ion of the end bracket 21 are provided, and 3 sets of mounting holes 21 d are pro
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`vided on the outer peripheral side of the elongated hole 3 c, each of which has 4
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`holes 1 d for inserting 4 lead wires 42 a of the Hall element 42 (see FIG. 5) corre
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`sponding to each of the square holes c of the bottom plate portion. 21. 4 positioni
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`ng holes 21 e corresponding to the positioning holes 3 d of the bottom plate porti
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`on are provided on the outer peripheral side of the mounting hole 21 d, and sprin
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`g engaging slits 21 f radially penetrating the outer peripheral edge are providedi
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`n the positioning holes 21 e. In addition, 2 semicircular bush fitting recessed porti
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`ons 21 g are provided on the outer peripheral edge of the printed circuit board 2
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`1.
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`[0024]A Hall element holder 43 as shown in FIG. 6 is mounted at a position of a
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`mount hole 21 d of 3 4 holes 1 of the printed circuit board 21, and a 1 connector
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`44 is mounted at an upper position of the Hall element holder 43 at an intermedia
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`te position. The first and 1 connectors 45,46 and are respectively mounted at pos
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`itions close to the bush fitting recess 21 g, and a heald bar IC 2 as shown in FIG.
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`7 is mounted at the positions of the 3 sets of 20 hole 1 sets of mounting holes 21
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`h. 47,
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`[0025]As shown in FIG. 5, the Hall element 42 has 4 lead wires 42 a. Each lead 4
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`2 ais generally not widened as shown, but extends straight from the Hall elemen
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`t 42.
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`[0026]As shown in FIG. 6, the Hall element holder 43 includes a narrow and long
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`front portion 43 a and a wide and short base portion 43 b. A mounting surface 43
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`c of the base portion 43 b is attached to the printed circuit board 21, and a front
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`portion 43 a passes through a square hole 3 c of the end bracket 3 and faces bet
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`ween the coil 18 of the stator 7 and the rotor 8. A housing portion 43 d of the Hal
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`| element 42 is provided in the front portion 43 a.
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`[0027 ]Between a bottom surface of the housing 43 d and an attachment surface
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`43 c of the base portion 43 b, 4 guide holes 43 are provided, which are bent in pa
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`rallel to each other and extend from the bottom surface of the base portion 43 b,
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`and the guide holes 43 are set at the same interval as the mount holes 21 d of th
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`e 4 holes 1 of the printed circuit board 21. In the mounting surface 43 c of the ba
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`se portion 43 b, a cutout recess 43 f is provided at each of the guide holes 43 e.
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`[0028]A front portion 43 a of the Hall element holder 43 and a surface of the bas
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`e portion 43 b on the side of the stator 7 are formed in an arc shape along an out
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`er peripheral surface of the coil 18, and a surface on the side of the rotor 8 is for
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`med in an arc shape along an inner peripheral surface of a pole piece 13 of the ro
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`tor 8. In addition, a surface of the front portion 43 a of the front portion 43 a ont
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`he side of the rotor 8 is formed in an opening (cutout) 43 g.
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`[0029]When each lead wire 42 a is pushed into the guide hole 43 from the housin
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`g portion 42 d of the Hall element holder 43, each of the lead wires 42 a is guided
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`by the guide hole 43 a and is projected from the base portion 43 b side while nat
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`urally widening the distance between the lead holes 43 e. Then, the lead wires 42
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`a are inserted into the mount holes 21 d of the printed circuit board 21, soldered
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`to the pattern circuit of the pattern surface 21 b, and attached to the printed circ
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`uit board 21.
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`[0030]The lead terminals of the 1 connector 44 are passed through the printed ci
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`rcuit board 21, and the projected ends thereof are soldered to the power pattern
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`circuit of the pattern surface 21 b shown in FIG. 12, and are mounted on the prin
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`ted circuit board 21 as shown in FIG. 2. A terminal of an electric wire 48 (see FI
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`G. 1) from an external power source is plugged into the 1 connector 44.
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`[0031]The lead terminals of the 2 and 3 connectors 45,46 and are passed throug
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`h the printed circuit board 21, and the leading ends of the first and second conne
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`ctors 5 and 5 are soldered to the end processing pattern circuit of the coil 18 of t
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`he pattern surface 21 b shown in FIG. 12, and are attached to the printed circuit
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`board 21 as shown in FIG. 2. As shown in FIG. 2 1 terminals of each connector 4
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`5,46 are respectively plugged with terminals of 3 sets of flexible wires 49, andar
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`eceptacle 50 as shown in FIG. 10 is provided at the other end of each of the wires
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`49. Each of the receptacles 50 is connected to the coil terminal pin 19 of the stato
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`r 8 by passing the electric wire 49 toward the pattern surface 21 b of the printed
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`circuit board 21 and then passing through the elongated hole 21 c of the printed
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`circuit board 21 and the elongated hole 3 b of the bottom plate of the end bracke
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`t 3. In addition, the receptacle 50 is covered with a heat-shrinkable insulating tub
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`e. The long hole 21 c of the printed circuit board 21 and the long hole 3 b of the e
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`nd bracket 3 are elongated holes in the circumferential direction to prevent the re
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`ceptacle 50 from coming into contact with the elongated holes 7 c and 21 b duet
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`o the cogging because the stator 3 vibrates due to cogging.
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`[0032]As shown in FIG. 7, the driver IC 47 has 20 lead terminals 47 a, and the le
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`ad terminals 47 a are inserted into the mount holes 4 h of the printed circuit boar
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`d 21 shown in FIG. 21 a, and the protruded tips are soldered to pattern circuits of
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`the pattern surface 21 b to be attached to the printed circuit board 21. As shown
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`in FIG. 1, an IC sheet 23 made of rubber is interposed between the driver IC 47 a
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`nd the printed circuit board 21, and an insulating sheet 24 made of a heat-resista
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`nt polyolefin and an inorganic material is bonded to a heat radiation surface of th
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`e driver IC 47.
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`[0033]As shown in FIG. 11, a semi-circular **** is provided.
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`A shoe 25 is provided, and a recessed groove 25 a on an outer peripheral surfac
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`e, an axial through hole 25 bin an axial direction, and a slit 25 c for inserting ele
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`ctric wire from the through hole 25 b to an outer surface are formed in the rubber
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`bush 25. In this rubber bush 25, a recessed groove 25 a is fitted in 2 bush fitting
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`recessed parts 21 g of the printed circuit board 21 from a radial direction and is
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`mounted on a printed circuit board 21. In the through hole 25 b of each of the ru
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`bber bushings 25, an intermediate portion of the 3 pairs of electric wires 49 of th
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`e 2 and 3 connectors 45,46 and is inserted from the electric wire insertion slit 25
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`c. 1.
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`[0034]A spacer 27,28 having a long arc shape as shown in FIGS. 8 a and 3 b and
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`a spacer 28 having a short arc shape as shown in FIGS. 4c and 4d are provided,
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`and positioning projections 27 a and 28 a are provided on both surfaces of each s
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`pacer 27 and, respectively. In the spacer 27,28, as shown in FIG. 2, the long spa
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`cer 27 is fitted into the 2 positioning holes 21 of the upper of the printed circuit b
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`oard 21 from the part mounting surface 21 a side, and a short spacer 28 is provid
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`ed. 27 One positioning projection 28 a is fitted into the lower 2 positioning holes
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`21 e from the part mounting surface 21 a side.
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`[0035]Then, a part mounting surface 21 a of the printed circuit board 21 is oppos
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`ed to a bottom plate part of the end bracket 3. Byfitting the positioning projectio
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`ns 27,28 a, 27 a of the respective spacers 28 into the positioning holes 3 d of the
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`end bracket 3, the printed circuit board 21 is positioned in a parallel state and in
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`a rotation direction of the bottom plate portion of the end bracket 3. The end surf
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`ace of the rubber bush 25 is in contact with the end bracket 3 and functions as a
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`spacer. Further, the driver IC 47 is pressed by the IC sheet 23, and the insulating
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`sheet 24 comesinto close contact with the bottom plate portion of the end bracke
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`t 3. As a result, the end bracket 3 can be used as a heat radiation fin of the driver
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`IC 47, so that the motor can be made compact.
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`[0036]As shown in FIG. 9, an approximately U-shaped spring clip 37 is provided,
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`and the spring clip 37 is inserted into the insertion hole 3 a of the end bracket 3 t
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`o be inserted into the spring insertion hole 37 e. A presser piece part 37 b is provi
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`ded in contact with an outer peripheral edge part of a pattern surface 21 b of the
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`printed circuit board 21 to press the printed circuit board 21 to the end bracket 3
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`side. In this pressing piece portion 37 b, there are formed a V-shaped central proj
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`ection 37 c which engages with the spring engaging slit 21 f of the printed circuit
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`board 21, and semicircular protrusions 37 d and 21 d which contact the outer peri
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`pheral edges of both sides of the spring engaging slit 37 f. By sharing the spring
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`engaging slit 37 f of the printed circuit board 21 with which the central projection
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`37 c of the spring clip 21 is engaged with the positioning hole 21, warpage of the
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`printed circuit board 21 is reduced.
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`[0037 ]And as shown in Fig.1, it is the above-mentioned end bracket about the pu
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`sh-in piece part 37a of the four spring clips 37.
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`The printed circuit board 21 is attached to the end bracket 3 by inserting the prin
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`ted circuit board 21 into the 3 spring insertion holes and pressing the outer perip
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`heral edge portion of the pattern surface 3 b of the printed circuit board 37 by th
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`e pressing piece portions 21 b.
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`[0038 ]In the above configuration, since the guide hole 43 is provided in the Hall
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`element holder 43, when the Hall element 42 is assembled to the Hall element ho
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`Ider 43, the 4 lead wires 42 a of the Hall element 42 are pushed into the guide ho
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`le 43 from the housing portion 43 d side of the Hall element holder 43. Each lead
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`42 a is guided by a guide hole 43 e, and its interval is naturally widened, and whe
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`n it protrudes from the base 43 b side to the outside, it is spread in parallel with t
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`he same interval as the mount hole 21 d of the printed circuit board 21. Thus, it i
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`s possible to easily attach the lead 42 a to the mount hole 21 d of the printed circ
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`uit board 21 and attach the Hall element holder 43 to the printed circuit board 2
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`1.
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`[0039]Further, since the base portion 43 b of the Hall element holder 43 is forme
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`d to have a wide width, it can be mounted on the printed circuit board 21 in a sta
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`ble and stable state, and reliability of detection accuracy by the Hall element 42 i
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`s improved.
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`[0040]Further, since the recess 43 f is provided on the mounting surface 43 c of t
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`he base portion 43 b of the Hall element holder 43, heat transmitted through the
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`lead wire 43 a is dissipated by the cutout portion 43 f during the soldering operati
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`on of the lead 42 a of the Hall element 42 to the printed circuit board 21, thereby
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`preventing melting of the mounting surface 42 c.
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`[0041 ]Furthermore, since the housing portion 43 d of the tip portion 43 a of the
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`Hall element holder 43 is formed in an arcuate surface, the Hall element 42 can b
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`e faced to a narrow gap between the stator 7 and the rotor 8. Further, by forming
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`an opening 43 g on the surface of the housing portion 43 d on the rotor 8 side, th
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`e housing portion 43 d can be made thinner. When the Hall element 42 is bent in
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`contact with the coil 18, it is preferable to keep the surface of the stator 7 closet
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`o the coil 18 because the magnetic flux cannot be detected.
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`[0042]On the other hand, the terminal of the flexible wire 49 is connected to the
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`2 and 3 connectors 45,46 mounted on the printed circuit board 21, and the flexibl
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`e wire 49 is detoured to the pattern surface 21 b of the printed circuit board 21, a
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`nd the receptacle 50 is inserted and connected from the elongated hole 21 c, 3 b
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`to the coil terminal pin 19. An intermediate part of a flexible wire 49 is inserted in
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`to a through hole 25 b from a wire insertion slit 25 c of a rubber bush 25 and hel
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`d by a rubber bush 25. Thus, even if the stator 7 vibrates due to cogging, the vib
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`ration is absorbed by the flexible electric wire 49 and is not transmitted to the pri
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`nted circuit board 21 side, so that adverse effects such as vibration of the Hall ele
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`ment 42 can be prevented.
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`[0043]In addition, since the terminals of the flexible wire 49 can be pluggedinto
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`the connector 45,46, melting of the insulating coating, such as when the wire is s
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`oldered and connected, is prevented.
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`It cuts. Further, since the receptacle 50 of the flexible cable 49 can be plugged in
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`to the coil terminal pin 19 of the stator 7, the connection operation can be easily
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`performed.
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`[0044]Further, since the intermediate portion of the flexible wire 49 can be held b
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`y the rubber bush 25 only byinserting the intermediate portion of the flexible wir
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`e 25 into the slit 49 c, the holding work can be easily performed, and the flexible
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`wire 21 can be prevented from being loosened or damaged at the outer periphera
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`| edge portion of the printed circuit board 1. Moreover, since the vibration of the f
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`lexible electric wire 49 is absorbed by the rubber bush 25, the vibration is not tra
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`nsmitted from the rubber bush 25 to the printed circuit board 21.
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`[0045]
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`[Effect of the Invention] As is apparent from the above description, the DC brushl
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`ess motor according to the present invention has been described. A flexible electri
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`c wire with a terminal connected to a connector of a printed circuit board is detou
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`red to a pattern surface of a printed circuit board, the receptacle is inserted and c
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`onnected to the coil terminal pin from an insertion hole, and an intermediate part
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`of the flexible wire is held by a rubber bush. Therefore, even if the stator vibrates
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`due to cogging, since the vibration is absorbed by the flexible electric wire and is
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`not transmitted to the printed circuit board side, it is possible to prevent an adver
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`se effect such as vibration of the Hall element mounted on the printed circuit boar
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`d.
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`[0046]Further, since the terminal of the flexible cable can be plugged and connec
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`ted to the connector mounted on the printed circuit board, melting of the insulati
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`ng coating such as when the electric wire is soldered and connected can be preve
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`nted, and further, the receptacle of the flexible wire can be connected and connec
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`ted to the coil terminal pin of the stator, so that the connection work can be easil
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`y performed.
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`[0047 ]In addition, since the intermediate portion of the flexible electric wire can
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`be held by the rubber bush only by inserting the intermediate portion into the sli
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`t, the holding work can be easily performed, and the flexible electric wire can be
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`https://www j-platpat.inpit.go.jp/p0200
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`Page 14 of 25
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`broken and the outer peripheral edge portion of the printed circuit board can bed
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`amaged.
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`It can be prevented. Moreover, since the vibration of the flexible electric wire is a
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`bsorbed by the rubber bush, no vibration is transmitted from the rubber bush to t
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`he printed circuit board.
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`[Brief Description of the Drawings]
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`[Fig. 1]FIG. 1 is a cross-sectional view of a DC brushless motor of the present inv
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`ention ;.
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`[Fig. 2]FIG. 3 is a front view and a side view of a part assembled state of a printe
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`d circuit board ;.
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`[Fig. 3]It is the front view and cross sectional view of an end