Title:
MOTOR CONTROL METHOD, MOTOR CONTROL SYSTEM, AND ELECTRIC POWER STEERING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/173587
Kind Code:
A1
Abstract:
The motor control method includes a step for obtaining a component BEMFα on the α axis and a component BEMFβ on the β axis of the counter electromotive force of the motor, a step for differentiating the BEMFα component and the component BEMFβ by time, a step for squaring the differential value of the component BEMFα to obtain the first multiplication value and squaring the differential value of the component BEMFβ to obtain a second multiplication value, a step for finding a square root of the sum of the first multiplication value and the second multiplication value, a step for finding the absolute value of the counter electromotive force on the basis of the component BEMFα and the component BEMFβ, a step for finding at least one of the number of revolutions of the rotor on the basis of the square root value and the absolute value of the counter electromotive force, and a step for controlling the motor on the basis of at least one of the rotational speed and number of revolutions of the rotor.
Inventors:
GHADERI AHMAD (JP)
Application Number:
PCT/JP2018/005800
Publication Date:
September 27, 2018
Filing Date:
February 19, 2018
Export Citation:
Assignee:
NIDEC CORP (JP)
International Classes:
H02P6/182; H02P6/17
Domestic Patent References:
| WO2017025993A1 | 2017-02-16 |
Foreign References:
| JP2011120445A | 2011-06-16 | |||
| JPH05236783A | 1993-09-10 |
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