Synchronous electric motor drive system having slit windings
AssigneePanasonic Corporation
InventorsNoriyoshi Nishiyama, Makoto Kitabatake
Life of this patent
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Abstract
A synchronous motor drive system improves the design flexibility regarding torque characteristics as compared with conventionally available design flexibility. A synchronous motor has a rotor and a stator. Each of at least two adjacent stator teeth has a slit formed at the tip thereof. Each of a plurality of stator teeth has a main coil wound therearound in concentrated winding. Between each two adjacent teeth having a slit, a sub-coil is wound around in a manner of being accommodated in the respective slits. The drive device separately controls electric current supplied to the main coils and electric current supplied to the sub-coil.
Claims20
A synchronous motor drive system comprising a synchronous motor and a drive device for driving the synchronous motor,
- the synchronous motor including:
- a rotor having a plurality of magnetic poles located circumferentially of the rotor at equally spaced intervals;
- a stator having an annular stator yoke and a plurality of stator teeth located circumferentially on the stator yoke at equally spaced intervals, each stator tooth in one or more pairs of two adjacent stator teeth having a slit formed at a tip thereof;
- a plurality of main coils each wound around a different one of the stator teeth in concentrated winding;
- and
- one or more sub-coils each wound between a different pair of the one or more pairs through the slits, wherein
- the drive device is configured to separately control electric current supplied to the main coils and electric current supplied to the sub-coils, and supplies electric current only to the main coils when a requested torque is less than a predetermined value and to both the main coils and the sub-coils when the requested torque is equal to or greater than the predetermined value.
A synchronous motor comprising:
- a rotor having a plurality of magnetic poles located circumferentially of the rotor at equally spaced intervals;
- a stator including an annular stator yoke and a plurality of stator teeth located circumferentially on the stator yoke at equally spaced intervals, each stator tooth having a slit formed at a tip thereof;
- a plurality of main coils each wound around a different one of the stator teeth in concentrated winding;
- and
- a plurality of sub-coils each wound between a different pair of two adjacent stator teeth through the slit, one or more of the stator teeth not provided with any of the sub-coils, wherein
- any slit accommodating none of the sub-coils is smaller in cross-sectional area than any slit accommodating one of the sub-coils.
Dependencies are inferred from the claim text.