Title:
MOTOR DRIVING DEVICE AND WORK MACHINE
Document Type and Number:
WIPO Patent Application WO/2023/243362
Kind Code:
A1
Abstract:
Provided are a motor driving device and a work machine which can stably control a brushless motor in a sensorless driving system. A control unit 41 is configured such that a superposed voltage is superposed on a control command voltage at a cycle that is 1.5 times the cycle of a PWM carrier signal. Specifically, the control unit 41 causes the superposed voltage to be superposed on the control command voltage in a time period corresponding to a predetermined lowering region of the PWM carrier signal, but does not cause the superposed voltage to be superposed on the control command voltage in time periods corresponding to subsequently continuous rising and lowering regions of the PWM carrier signal, and then causes the superposed voltage to be superposed on the control command voltage in a time period corresponding to a further subsequently continuous rising region of the PWM carrier signal.
Inventors:
HARADA KENTA (JP)
Application Number:
PCT/JP2023/019610
Publication Date:
December 21, 2023
Filing Date:
May 26, 2023
Export Citation:
Assignee:
KOKI HOLDINGS CO LTD (JP)
International Classes:
H02P27/08; H02P21/24
Domestic Patent References:
| WO2016067811A1 | 2016-05-06 |
Foreign References:
| JP2008131770A | 2008-06-05 | |||
| JP2016072991A | 2016-05-09 |
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