US 9,812,913 B2
Electric machine with Q-offset grooved interior-magnet rotor and vehicle
Yasuyuki Saito, Hitachinaka (JP); Tsuyoshi Goto, Hitachinaka (JP); Kenichi Nakayama, Hitachinaka (JP); Noriaki Hino, Hitachi (JP); and Shinji Sugimoto, Hitachi (JP)
Assigned to Hitachi Automotive Systems, Ltd., Hitachinaka-shi (JP)
Filed by Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki (JP)
Filed on Feb. 18, 2016, as Appl. No. 15/46,813.
Application 15/046,813 is a continuation of application No. 13/124,502, granted, now 9,300,176, previously published as PCT/JP2009/067795, filed on Oct. 14, 2009.
Claims priority of application No. 2008-266952 (JP), filed on Oct. 16, 2008.
Prior Publication US 2016/0164354 A1, Jun. 9, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. H02K 1/27 (2006.01); B60L 11/14 (2006.01); B60L 15/02 (2006.01); H02P 27/06 (2006.01); H02K 7/00 (2006.01); B60L 11/12 (2006.01); B60L 15/20 (2006.01); H02K 1/24 (2006.01); B60K 1/02 (2006.01); B60K 6/26 (2007.10); B60K 6/445 (2007.10); H02K 29/03 (2006.01); B60L 15/00 (2006.01)
CPC H02K 1/276 (2013.01) [B60L 11/123 (2013.01); B60L 11/14 (2013.01); B60L 15/025 (2013.01); B60L 15/20 (2013.01); H02K 1/24 (2013.01); H02K 1/2766 (2013.01); H02K 7/006 (2013.01); H02P 27/06 (2013.01); B60K 1/02 (2013.01); B60K 6/26 (2013.01); B60K 6/445 (2013.01); B60L 15/007 (2013.01); B60L 2210/10 (2013.01); B60L 2210/40 (2013.01); B60L 2220/14 (2013.01); B60L 2240/421 (2013.01); B60L 2240/423 (2013.01); B60L 2240/429 (2013.01); B60L 2240/443 (2013.01); B60L 2240/547 (2013.01); B60L 2240/549 (2013.01); B60L 2270/142 (2013.01); B60L 2270/145 (2013.01); H02K 29/03 (2013.01); H02K 2201/06 (2013.01); Y02T 10/6217 (2013.01); Y02T 10/6239 (2013.01); Y02T 10/641 (2013.01); Y02T 10/643 (2013.01); Y02T 10/7077 (2013.01); Y02T 10/7216 (2013.01); Y02T 10/7241 (2013.01); Y02T 10/7275 (2013.01)] 6 Claims
OG exemplary drawing
 
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, wherein
the 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 τg/τp is set from 0.5 to 0.9, wherein τp indicates pole pitch of the permanent magnet and τg indicates an angle for the magnet and the first magnetic air gaps on both sides thereof.