US 12,152,914 B2
Multiple-system rotation sensor, and electric power steering device provided with multiple-system rotation sensor
Shohei Fujikura, Tokyo (JP); Hiroko Ikeda, Tokyo (JP); Tatsuya Mori, Tokyo (JP); Kenji Ikeda, Tokyo (JP); Kenta Kubo, Tokyo (JP); and Toshihiro Matsunaga, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/907,858
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Apr. 9, 2020, PCT No. PCT/JP2020/015955
§ 371(c)(1), (2) Date Aug. 29, 2022,
PCT Pub. No. WO2021/205597, PCT Pub. Date Oct. 14, 2021.
Prior Publication US 2023/0078128 A1, Mar. 16, 2023
Int. Cl. G01D 5/20 (2006.01); B62D 5/04 (2006.01)
CPC G01D 5/20 (2013.01) [B62D 5/0481 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multiple-system rotation sensor comprising:
a stator core having S number of magnetic poles arranged at equal intervals (S is a natural number greater than or equal to 4);
stator windings wound on the magnetic poles, the stator windings being formed as system windings of N number of systems, the number of the systems being N (N is a natural number equal to or larger than 2); and
a rotor core disposed so as to face the stator core and having R number of magnetic poles (R is a natural number greater than 2), wherein
each stator winding is composed of an excitation winding and two phases of output windings,
wherein the numbers of magnetic poles of the stator and rotor core are in a relationship of S=nRN (n is a natural number),
system windings of each system are wound so as to be divided for every R magnetic poles among the S magnetic poles of the stator core, and
a winding arrangement of the system windings of each system is made so as to achieve R-times rotational symmetry about a rotor rotation axis.