Rotor, motor and electrical device including the motor
AssigneeNidec Corporation
InventorsSheng-Chan Yen, Hsin-Nan Lin, Yu-Wei Hsu, Cheng-Tsung Liu
Life of this patent
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Abstract
A motor includes a stator including wound multiphase coils and stator slots that accommodate the multiphase coils, and a rotor provided at an inner side of the stator. Poles are provided in a direction of rotation, and sets of flux barriers are provided on the rotor, each of the poles respectively corresponding to a set of the flux barriers. A ratio between a total number of the stator slots and a product of a total number of poles of the rotor and a phase number of the multiphase coils is a non-integer. With the structure of the motor, a torque ripple is reduced while an output torque is kept unchanged.
Claims7
A motor, comprising:
- a stator including wound multiphase coils and stator slots that accommodate the multiphase coils;
- and
- a rotor provided at an inner side of the stator, a plurality of poles being provided in a direction of rotation, sets of flux barriers being provided on the rotor, each of the plurality of poles respectively corresponding to one of the sets of flux barriers;
- wherein
- a ratio between a total number of the stator slots and a product of a total number of the plurality of poles of the rotor and a phase number of the multiphase coils is a non-integer;
- and
- at least one of the following is true:
- total numbers of the stator slots corresponding to two adjacent ones of the plurality of poles are unequal, and total numbers of the stator slots corresponding to every two nonadjacent ones of the plurality of poles with one of the plurality of poles spaced therebetween are equal;
- or
- total numbers of the stator slots occupied by coils of each phase in two adjacent ones of the plurality of poles are different, and total numbers of the stator slots occupied in every two nonadjacent ones of the plurality of poles with one of the plurality of poles spaced therebetween are equal.
Dependencies are inferred from the claim text.