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

  • US 9,812,913 B2
  • Filed: 02/18/2016
  • Issued: 11/07/2017
  • Est. Priority Date: 10/16/2008
  • Status: Active Grant
First Claim
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1. A rotor comprising:

  • a plurality of magnets;

    a rotor core comprising 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; and

    a 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, whereinthe second magnetic air gap is formed independently from the first magnetic air gap;

    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; and

    a magnet hole pole radian τ

    g/τ

    p is set from 0.5 to 0.9, wherein τ

    p indicates pole pitch of the permanent magnet and τ

    g indicates an angle for the magnet and the first magnetic air gaps on both sides thereof.

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