公开(公告)号：US11901851B2

公开(公告)日：2024-02-13

申请号：US17660041

申请日：2022-04-21

申请人： MINEBEA MITSUMI Inc.

发明人： Masato Aoki ,  Hiroyuki Kaidu ,  Wataru Nogamida ,  Syu Hayashi ,  Takahiro Asami

IPC分类号： H02P6/08 ,  H02P6/15

CPC分类号： H02P6/153

摘要： A motor drive control device 1_2 includes a target point determination unit 12_2 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 14_2 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 19_2 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 16_2 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.