Patent
Motor driving device and motor system
Minoru Kurosawa,Kichiya Itagaki +1 more
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TLDR
In this article, the phase of a drive current of a motor is optimized by using a phase arithmetic unit to converge the phase difference between the reference voltage phase θbemf and the reference current phase ǫ to zero based on a prescribed arithmetic expression.Abstract:
The phase of a drive current of a motor is optimized. The phase arithmetic unit PHCAL calculates a drive voltage phase θdrv to converge the phase difference between the reference voltage phase θbemf and the reference current phase θi to zero based on a prescribed arithmetic expression. The phase correction unit PHCP determines the phase θdrvR after the correction by adding a correction value to the phase θdrv, and the magnitude of the correction value is updated by a feedback control so as to converge to a prescribed value the phase difference between the reference voltage phase θbemf and the reference current phase θi which are inputted. A PWM controller shifts an energization control timing synchronized with the reference voltage phase θbemf based on the corrected phase θdrvR, and generates the PWM signal for controlling the drive voltage to a sine wave shape.read more
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References
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Patent
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TL;DR: In this article, a power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper and lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low.
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