Electric machine with Q-offset grooved interior-magnet rotor and vehicle

摘要

A rotating electric machine includes a stator having a stator coil and a rotor provided rotatably around a specific rotation axis with respect to the stator. The rotor includes a plurality of magnets, a plurality of magnetically-assisted salient pole members provided between poles of any adjacent two magnets from among the plurality of magnets, and a magnetoresistance variation unit provided in the magnetically-assisted salient pole member along an axial direction of the rotation axis at a position offset in a circumferential direction of the rotation axis from a q-axis passing through a salient pole center of the magnetically-assisted salient pole member. The amount of offset of the magnetoresistance variation unit from the q-axis varies depending on positions of the magnetically-assisted salient pole members so that torque fluctuations cancel each other when power is applied.

主权项

1. A rotating electric machine comprising:
a stator having a stator coil; and a rotor provided rotatably around a specific rotation axis with respect to the stator, wherein the rotor includes:
a plurality of magnets;a plurality of holes in which the magnets are provided;wherein the plurality of magnets are arranged in regions of alternating polarity, wherein each of said regions has at least one magnet;a plurality of magnetically-assisted salient pole members, each of which is provided in a core portion between the regions;a first magnetic air gap formed with an edge of each of the magnets and the holes; anda second magnetic air gap provided in each of the magnetically-assisted salient pole members along an axial direction of the rotation axis at a position offset in a circumferential direction of the rotation axis from a q-axis passing through a salient pole center of each of the magnetically-assisted salient pole members, wherein the second magnetic air gap is formed independently from the first magnetic air gap; and the second magnetic air gap has an amount of offset from the q-axis in a cross section perpendicular to the rotation axis, the amount of offset varying depending on positions of the magnetically-assisted salient pole members so that torque fluctuations in the cross section cancel each other when power is applied.