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Interior permanent magnet synchronous motor

  • US 20040017123A1
  • Filed: 07/21/2003
  • Published: 01/29/2004
  • Est. Priority Date: 09/13/2000
  • Status: Abandoned Application
First Claim
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1. An interior permanent magnet synchronous motor comprising:

  • a stator including a stator core provided with a plurality of magnetic pole sections having windings of at least one phase wound thereon;

    a rotor having p pole pairs (p;

    a positive integer of 1 or more);

    said rotor including a shaft and a rotor core fixed on said shaft;

    said rotor core having 2p permanent magnets incorporated therein in a manner to be spaced from each other at intervals in a peripheral direction thereof;

    said 2p permanent magnets constituting 2p permanent magnet magnetic pole sections formed on an outer periphery of said rotor core;

    said rotor being formed with 2p magnetic salient pole sections so as to interpose said permanent magnet magnetic pole section therebetween;

    said 2p magnetic salient pole sections consisting of a first and a second groups of magnetic salient pole sections, said first group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of the magnetic salient pole sections of a second group is interposed between two adjacent magnetic salient pole sections and said second group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of magnetic salient pole sections of the first group is interposed between two adjacent magnetic salient pole sections;

    wherein an open angle α

    1 of said p magnetic salient pole sections of said first group is set smaller than an open angle α

    2 of said p magnetic salient pole sections of said second group;

    said open angles α

    1 and α

    2 are determined to satisfy the following expressions;

    α

    2−

    α

    1≈





    (2n−

    1)τ

    s wherein n is a natural number, β

    is an angle between two salient pole section virtual center lines CL1, CL2 which extend from the center of said shaft through the center of said two adjacent magnetic salient pole sections, and τ

    s is the slot pitch of said stator core.

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