The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2020
Filed:
Aug. 01, 2017
Nidec Corporation, Kyoto, JP;
Ahmad Ghaderi, Kyoto, JP;
NIDEC CORPORATION, Kyoto, JP;
Abstract
A motor control method includes acquiring a component BEMFon an α-axis and a component BEMFon a β-axis of counter electromotive force of a motor in an αβ-fixed coordinate system; performing time differentiation on the component BEMFon the α-axis and the component BEMFon the β-axis; obtaining a difference value between first and second multiplication values, the first multiplication value being obtained by multiplying the component BEMFon the α-axis by a differential value of the component BEMFon the β-axis, the second multiplication value being obtained by multiplying the component BEMFon the β-axis by a differential value of the component BEMFon the α-axis; detecting a rotation direction of the rotor based on the difference value; and controlling the motor based on a detection result of the rotation direction of the rotor.