Minebea Mitsumi Inc.

Syu Hayashi

Masato Aoki

Hiroyuki Kaidu

Wataru Nogamida

Takahiro Asami

A motor drive control device_includes a target point determination unit_determining a target point P of zero crossing of a coil current Iu of a U phase based on a position detection signal Shu, a current zero crossing point estimation unit_estimating a zero crossing point Q of the coil current Iu of the U phase by detecting a change in a current direction of the coil current Iu of the U phase at a predetermined timing in every cycle of a PWM signal, an adjustment instruction signal generation unit_generating at least one of a phase adjustment instruction signal Sp for instructing phase adjustment of the coil current Iu and a frequency adjustment instruction signal Sf for instructing frequency adjustment of the PWM signal according to a phase difference Δφ between the target point P and the zero crossing point Q such that the phase difference is within a predetermined range, and a drive control signal generation unit_generating a drive control signal Sd based on at least one of the phase adjustment instruction signal Sp and the frequency adjustment instruction signal Sf.

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Chitose, Japan

Syu Hayashi