Invention Grant
- Patent Title: Motor control apparatus and motor control method
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Application No.: US16607529Application Date: 2017-10-30
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Publication No.: US10985678B2Publication Date: 2021-04-20
- Inventor: Kazunari Kanazawa , Takeshi Tomizaki , Nobumasa Usiro , Makoto Maruyama , Yuji Ogawa
- Applicant: SINFONIA TECHNOLOGY CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: SINFONIA TECHNOLOGY CO., LTD.
- Current Assignee: SINFONIA TECHNOLOGY CO., LTD.
- Current Assignee Address: JP Tokyo
- Agency: Buchanan Ingersoll & Rooney PC
- Priority: JPJP2017-089095 20170428
- International Application: PCT/JP2017/039138 WO 20171030
- International Announcement: WO2018/198405 WO 20181101
- Main IPC: H02K17/16
- IPC: H02K17/16 ; H02P6/15

Abstract:
A motor control apparatus includes: a motor drive control section that controls driving of a motor using a predetermined phase; a rotation position detecting section that, at every 180 degrees of an electrical angle of the motor, outputs two kinds of detection signals according to the rotation position of the rotor of the motor; a stopped position estimating section that estimates the stopped position at the start of rotation of the rotor using an elapsed time from when rotation the rotor starts until the kind of the detection signal outputted from the rotation position detecting section switches; a rotational speed estimating section that estimates the rotational speed of the rotor using the elapsed time and the stopped position; and an estimated phase calculating section that calculates an estimated phase as the aforementioned predetermined phase using the rotational speed.
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