| CPC H02K 1/28 (2013.01) [H02K 1/2791 (2022.01); H02K 21/22 (2013.01); H02K 2213/03 (2013.01)] | 15 Claims |
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1. A rotating electrical machine comprising:
a field generator that includes a magnet unit, the magnet unit having a plurality of magnetic poles whose polarities are alternately arranged in a circumferential direction; and
an armature that includes a multi-phase armature winding, one of the field generator and the armature serving as a rotor of the rotating electrical machine, wherein:
the magnet unit comprises:
a plurality of magnets arranged in the circumferential direction; and
a holder member that is made of a magnetic material and has a plurality of magnet installation holes in which the magnets are respectively installed;
each of the magnet installation holes is formed to be in conformity with a radial cross-sectional shape of a corresponding one of the magnets to be installed therein;
each of the magnets and the corresponding magnet installation holes has opposite peripheral surfaces, one of the opposite peripheral surfaces serving as a far-stator peripheral surface located to be farther from the stator than the other of the opposite peripheral surfaces;
the far-stator peripheral surface of each of the magnets and the corresponding magnet installation holes has a circumferential end and a circumferential middle;
the magnet unit has a first radial dimension defined from the circumferential end of the far-stator peripheral surface to the stator, and a second radial dimension defined from the circumferential middle of the far-stator peripheral surface to the stator;
the first radial dimension is less than the second radial dimension;
each of the magnets has a d-axis side region on or adjacent to a corresponding d-axis and a q-axis side region adjacent to a corresponding q-axis, the d-axis of each of the magnets being a center of a corresponding one of the magnetic poles, the q-axis being a boundary between a corresponding adjacent pair of the magnetic poles;
each of the magnets has a first length in the circumferential direction and a second length in a corresponding radial direction, the first length being longer than the second length;
each of the magnets is magnetically oriented to have:
a first set of easy axes of magnetization formed in the d-axis side region and arranged to intersect with the radial direction;
a second set of easy axes of magnetization formed in the q-axis side region and arranged to intersect with the radial direction, the easy axes of magnetization formed in the d-axis side region being more parallel to the d-axis than the easy axes of magnetization formed in the q-axis side region;
first magnetic paths created along the respective easy axes of magnetization formed in the d-axis side region; and
second magnetic paths created along the respective easy axes of magnetization formed in the q-axis side region; and
each adjacent pair of the magnets is separated from one another with respect to a corresponding one of the d-axes or a corresponding one of the q-axes.
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