Title:
MAGNETIC FIELD POSITION DETECTION METHOD FOR ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2019/008846
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a magnetic field position detection method that can realize low cost by using simple hardware and software and can detect a rotor position in units of excitation sections in 120° energization without generating sensing noise at the time of initiation. As a solution, an MPU (51) acquires, through calculation, a neutral point potential from an energization-phase voltage measured by an A/D conversion circuit (53), acquires the difference between the neutral point potential and a non-energization-phase voltage, and performs magnitude comparison between the difference and a negative-side threshold in the case where the current position is an odd-numbered section or between the difference and a positive-side threshold in the case where the current position is an even-numbered section, and determines the end point of the 60° energization section when the difference exceeds a threshold in a direction away from the neutral point potential.
Inventors:
YAMAMOTO KIYOSHI (JP)
Application Number:
PCT/JP2018/012759
Publication Date:
January 10, 2019
Filing Date:
March 28, 2018
Export Citation:
Assignee:
HOKUTO CONTROL CO LTD (JP)
International Classes:
H02P6/185
Foreign References:
| JP2017022867A | 2017-01-26 | |||
| JP2013055744A | 2013-03-21 | |||
| JP2007252066A | 2007-09-27 | |||
| JP2009189176A | 2009-08-20 | |||
| JPH10174482A | 1998-06-26 | |||
| JP2006254626A | 2006-09-21 |
Other References:
See also references of EP 3595164A4
Attorney, Agent or Firm:
WATANUKI PATENT SERVICE BUREAU (JP)
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