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Title:
MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2019/151200
Kind Code:
A1
Abstract:
[Problem] To provide: a motor control device based on a vector control method, said motor control device improving the strain of a current waveform and enhancing responsiveness to current control by compensating for a dead time of an inverter and estimating a disturbance that cannot be compensated for through the dead time compensation, thus suppressing sound, vibration, and torque ripple of a motor; and an electric power steering device equipped with the same. [Solution] The present invention is a motor control device that performs vector control of a three-phase brushless motor on the basis of dq-axis current command values and that performs vector control via an inverter by converting three-phase current detection values of the three-phase brushless motor into dq-axis feedback currents and feeding the dq-axis feedback currents back to the dq-axis current command values, converting deviation voltages of the feedback into two-phase duty command values, and converting the two-phase duty command values into three phases. The motor control device is provided with: a dq-axis dead time compensation unit that calculates dead time compensation values of the inverter and that performs dead time compensation; and a dq-axis disturbance estimation observer that inputs the dq-axis current command values, a motor revolving speed, the dq-axis feedback currents, and the deviation voltages and that calculates and outputs dq-axis disturbance compensation values. The motor control device adds the dq-axis disturbance compensation values to the deviation voltages and estimates a disturbance that cannot be compensated for through the dead time compensation.

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Inventors:
TAKASE HIROAKI (JP)
MINAKI RYO (JP)
SUGAWARA TAKAYOSHI (JP)
Application Number:
PCT/JP2019/002845
Publication Date:
August 08, 2019
Filing Date:
January 29, 2019
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
H02P21/13; B62D5/04; B62D6/00; H02P21/05; H02P27/08; B62D101/00; B62D113/00; B62D119/00
Domestic Patent References:
WO2018016476A12018-01-25
WO2017098840A12017-06-15
Foreign References:
JP2004064948A2004-02-26
JP2005124359A2005-05-12
JP2013215064A2013-10-17
JP4681453B22011-05-11
JP2015171251A2015-09-28
JP2007252163A2007-09-27
JP2017070066A2017-04-06
Other References:
See also references of EP 3598632A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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