`
`1. A motor comprising:
`
`a stator including3
`
`a stator core including an annular stator yoke, a plurality of
`
`outer teeth projecting outward from the stator yoke and a plurality of inner
`
`teeth, in the same number as the outer teeth, projecting inward from the stator
`
`yoke; and
`
`10
`
`15
`
`a plurality of windings wound on the stator core, and
`
`an outer rotor held by a shaft and confronting the outer teeth
`
`with an air gap therebetween;
`
`an inner rotor held by the shaft and confronting the inner teeth
`
`with an air gap therebetween,
`
`wherein the stator core includes outer slots formed between the
`
`outer teeth and inner slots formed between the inner teeth, and the windings
`
`are wound on the stator yoke between each one of the outer slots and each one
`
`of the inner slots, the windings are wound in a three-phase toroidal method and
`
`connected with one of a star connection and a delta connection,
`
`wherein a cross sectional cut of the stator reveals that a sectional
`
`20
`
`area of the outer slot is equal to that of the inner slot.
`
`2. The motor of claim 1, wherein a radial length of the outer slot is
`
`shorter than a radial length of the inner slot.
`
`25
`
`3. The motor of claim 1, wherein a cross section of the outer slot is equal
`
`to that of the inner slot in shape.
`
`
`
`
`
`10
`
`4. The motor of claim 3, wherein the shape is a rectangular.
`
`5. The motor of claim 1, wherein the winding is wound in an alignment
`
`winding method.
`
`6. The motor of claim 1, wherein the stator core is split into a plurality
`
`of core pieces.
`
`7. An apparatus that employs the motor as defined in any one of claim
`
`10
`
`1 — claim 6.
`
`
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