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Permanent magnet motor
| Details |
Inventors: Nakano, Masatsugu; Tominaga, Tsutomu; Megata, Hideki;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Mullins; Burton S.
Assistant Examiner:
Attorney, Agent or Firm: Leydig, Voit & Mayer, Ltd.
A permanent magnet motor having a rotor with permanent magnets disposed on the outer circumferential face at a predetermined interval in a peripheral direction, and a stator with magnetic pole pieces arranged at a predetermined spacing in the peripheral direction, the magnetic pole pieces being opposed to the permanent magnets, the stator surrounding the rotor, wherein auxiliary grooves are provided on a face of each magnetic pole piece of the stator opposed to the permanent magnets of the rotor, and a skew having an electric angle of 72.degree. is provided relatively between the rotor and the stator. |
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DETAILED DESCRIPTION This invention has been achieved to solve the above-mentioned problem, and it is an object of the invention to provide a permanent magnet motor of high performance in which the cogging torque is reduced and the torque ripple is also reduced.
According to a first aspect of the invention, there is provided a permanent magnet motor having a rotor with a plurality of permanent magnets disposed at a predetermined interval in a peripheral direction, and a stator with a plurality of magnetic pole pieces arranged at a predetermined spacing in the peripheral direction, the magnetic pole pieces of the stator being opposed to the permanent magnets of the rotor, wherein the auxiliary grooves are provided on a face of each magnetic pole piece of the stator that is opposed to the permanent magnets of the rotor, and a skew having an electric angle of 72.
degree.
is provided relatively between the rotor and the stator.
According to a second aspect of the invention, there is provided the permanent magnet motor, wherein a skew having an electric angle of 72.
degree.
is provided relatively between the rotor and the stator, where the number of poles is equal to 2N, and the number of slots is equal to 3N (N is an integer greater than or equal to 1).
According to a third aspect of the invention, there is provided the permanent magnet motor, wherein a skew having an electric angle of 72.
degree.
is provided relatively between the rotor and the stator, where the number of poles is equal to N, and the number of slots is equal to 3N (N is an integer greater than or equal to 2).
According to a fourth aspect of the invention, there is provided the permanent magnet motor according to claim 1, wherein a skew having an electric angle of 72.
degree.
is provided relatively between the rotor and the stator, where the number of poles is equal to 4N, and the number of slots is equal to 3N (N is an even number greater than or equal to 1).
According to a fifth aspect of the invention, there is provided the permanent magnet motor, wherein a skew is disposed on either one of the rotor and the stator
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Generators or Motors 
