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PERMANENT MAGNET ROTATING ELECTRIC MACHINE AND ELECTRIC POWER STEERING DEVICE USING THE SAME

  • US 20090251023A1
  • Filed: 02/24/2009
  • Published: 10/08/2009
  • Est. Priority Date: 04/04/2008
  • Status: Active Grant
First Claim
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1. A permanent magnet rotating electric machine comprising:

  • a stator including;

    a stator core having a plurality of teeth; and

    an armature winding wound around each of the plurality of teeth to configure the multiple phases; and

    a rotor including;

    a rotor core; and

    a plurality of permanent magnets provided in order in a peripheral direction around the rotor core,wherein the rotor is arranged to be spaced apart from the stator with an air gap therebetween, andwherein each of the permanent magnets has a curved surface opposed to the stator and is configured to satisfy the following relationship;

    0.65

    Rm ×

    h



    1
    W

    ( h



    1
    + g
    )


    1.37
    where Rm denotes a radius of curvature of the curved surface, h1 denotes a thickness of a central portion of the permanent magnet in the peripheral direction, W denotes a width of the permanent magnet in the peripheral direction, and g denotes an air gap length of the air gap.

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