	US 12,227,232 B2
	Phase adjustment method, correction value calculation device, motor control device, electric actuator product, and electric power steering device
Yusuke Nishioka, Maebashi (JP); Yoshihiro Aosaki, Fujisawa (JP); and Hiroyuki Yamamura, Tokyo (JP)
Assigned to NSK LTD., Tokyo (JP)
Appl. No. 17/435,248
Filed by NSK LTD., Tokyo (JP)
PCT Filed Dec. 16, 2020, PCT No. PCT/JP2020/047012 § 371(c)(1), (2) Date Aug. 31, 2021, PCT Pub. No. WO2021/161650, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 2020-022305 (JP), filed on Feb. 13, 2020.
Prior Publication US 2022/0135120 A1, May 5, 2022
Int. Cl. H02P 21/24 (2016.01); B62D 5/04 (2006.01); G01B 7/30 (2006.01); G01D 5/16 (2006.01); G01P 3/487 (2006.01); H02P 6/18 (2016.01); H02P 23/14 (2006.01); H02P 25/03 (2016.01)

CPC B62D 5/0463 (2013.01) [G01B 7/30 (2013.01); G01D 5/16 (2013.01); G01P 3/487 (2013.01); H02P 23/14 (2013.01); H02P 25/03 (2016.02)]

9 Claims

1. A phase adjustment method for a rotation angle sensor configured to detect a rotation angle of a rotor of a brushless motor, the phase adjustment method comprising: measuring a first rotation speed and a second rotation speed when the brushless motor is driven with a same torque command current to rotate clockwise and counterclockwise, respectively, on a basis of the rotation angle of the rotor detected by the rotation angle sensor; calculating a rotation speed difference between a first rotation speed and a second rotation speed; and calculating a correction value to correct a phase of the rotation angle sensor based on the calculated rotation speed difference and a known characteristic between a misalignment amount between a phase of the rotation angle sensor and a phase of the rotor with respect to the rotation speed difference.