Invention Grant
- Patent Title: Method for correcting magnetic field position error in electric motor
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Application No.: US16341348Application Date: 2017-12-12
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Publication No.: US11183955B2Publication Date: 2021-11-23
- Inventor: Kiyoshi Yamamoto
- Applicant: HOKUTO CONTROL Co., Ltd.
- Applicant Address: JP Nagano
- Assignee: HOKUTO CONTROL Co., Ltd.
- Current Assignee: HOKUTO CONTROL Co., Ltd.
- Current Assignee Address: JP Nagano
- Agency: Stites & Harbison, PLLC
- Agent Stephen J. Weyer, Esq.
- Priority: JPJP2016-241599 20161213
- International Application: PCT/JP2017/044528 WO 20171212
- International Announcement: WO2018/110538 WO 20180621
- Main IPC: H02P6/185
- IPC: H02P6/185 ; H02P6/21

Abstract:
The present invention addresses the problem of providing a method which makes it possible to simply evaluate an output of an initial position detection signal for a permanent magnetic field, along with providing a method for correcting errors that occur in the initial position detection signal. As a means for solving said problem, an MPU (51) obtains a correction value in which an offset error has been corrected by multiplying a first measurement value or a second measurement value, which are measured for each conduction pattern when an offset error occurs during position detection of a permanent magnetic field, by a correction coefficient A and estimates the position of the permanent magnetic field on the basis of the correction value.
Public/Granted literature
- US20210297020A1 METHOD FOR CORRECTING MAGNETIC FIELD POSITION ERROR IN ELECTRIC MOTOR Public/Granted day:2021-09-23
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