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Patent Searching and Data


Title:
MOTOR CONTROL DEVICE AND ELECTRIC PUMP DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/276320
Kind Code:
A1
Abstract:
One embodiment of a motor control device according to the present invention controls a three-phase motor having saliency through a sensorless 120-degree energization method, and is provided with: a drive circuit for converting a direct-current power supply voltage to three-phase alternating-current voltage and supplying the alternating current voltage to a three-phase motor; a current detection unit for detecting the current flowing through the three-phase motor; and a control unit for outputting to the drive circuit a switching control signal with which the energization pattern of the three-phase motor is switched at 60-degree intervals, and a three-phase alternating-current voltage in which a high-frequency voltage having a higher frequency than the frequency of the three-phase alternating-current voltage has been superposed is supplied to the three-phase motor. The control unit generates an inductance change signal correlated with an inductance change, on the basis of a detected current obtained from the current detection unit, and controls the timing for switching of the energization pattern on the basis of the inductance change signal.

Inventors:
KISHIDA HIDEO (JP)
Application Number:
PCT/JP2022/012010
Publication Date:
January 05, 2023
Filing Date:
March 16, 2022
Export Citation:
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Assignee:
NIDEC CORP (JP)
International Classes:
H02P6/185
Foreign References:
CN102780373A2012-11-14
JP2016201923A2016-12-01
JP2016201872A2016-12-01
JP2014079041A2014-05-01
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