Invention Grant
- Patent Title: Motor control method, motor control system, and electric power steering system
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Application No.: US16330844Application Date: 2017-08-01
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Publication No.: US10560044B2Publication Date: 2020-02-11
- Inventor: Ahmad Ghaderi
- Applicant: Nidec Corporation
- Applicant Address: JP Kyoto
- Assignee: NIDEC CORPORATION
- Current Assignee: NIDEC CORPORATION
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett
- Priority: JP2016-174319 20160907
- International Application: PCT/JP2017/027845 WO 20170801
- International Announcement: WO2018/047524 WO 20180315
- Main IPC: H02P21/09
- IPC: H02P21/09 ; H02P23/24 ; H02P6/00 ; H02P21/16 ; H02P21/22 ; B62D5/04

Abstract:
A motor control method includes acquiring a component BEMFα on an α-axis and a component BEMFβ on a β-axis of counter electromotive force of a motor in an αβ-fixed coordinate system; performing time differentiation on the component BEMFα on the α-axis and the component BEMFβ on the β-axis; obtaining a difference value between first and second multiplication values, the first multiplication value being obtained by multiplying the component BEMFα on the α-axis by a differential value of the component BEMFβ on the β-axis, the second multiplication value being obtained by multiplying the component BEMFβ on the β-axis by a differential value of the component BEMFα on 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.
Public/Granted literature
- US20190214928A1 MOTOR CONTROL METHOD, MOTOR CONTROL SYSTEM, AND ELECTRIC POWER STEERING SYSTEM Public/Granted day:2019-07-11
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