Invention Grant
- Patent Title: Motor control device, method of estimating initial position of magnetic pole of rotor, and image forming apparatus
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Application No.: US16815588Application Date: 2020-03-11
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Publication No.: US11218101B2Publication Date: 2022-01-04
- Inventor: Yuta Tachibana , Hiroyuki Yoshikawa , Yuji Kobayashi , Kazumichi Yoshida , Daichi Suzuki , Harumitsu Fujimori
- Applicant: Konica Minolta, Inc.
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta, Inc.
- Current Assignee: Konica Minolta, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Cantor Colburn LLP
- Priority: JPJP2019-043944 20190311
- Main IPC: H02P21/00
- IPC: H02P21/00 ; H02P21/18 ; H02P21/22 ; G03G15/00 ; H02P27/12

Abstract:
In a motor control device in one embodiment, an initial position estimation unit estimates an initial position of a magnetic pole of a rotor of a motor in an inductive sensing scheme. At each of energization angles, the initial position estimation unit multiplies a γ-axis current component Iγ corresponding to a peak value of a current flowing through a stator winding by each of a cosine value and a sine value of a correction angle obtained by correcting each of the energization angles. The initial position estimation unit estimates the initial position of the magnetic pole of the rotor based on a ratio between an integrated value of a multiplication result about the cosine value and an integrated value of a multiplication result about the sine value.
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