公开(公告)号：US20180083557A1

公开(公告)日：2018-03-22

申请号：US15674685

申请日：2017-08-11

Applicant: Renesas Electronics Corporation

Inventor： Minoru KUROSAWA ,  Kichiya ITAGAKI ,  Yusuke YASUMA

IPC: H02P6/10 ,  H02P6/15 ,  G11B19/20

CPC classification number: H02P6/10 ,  G11B19/2009 ,  G11B19/28 ,  H02P6/157 ,  H02P6/182

Abstract: There are provided a motor drive device and a motor system that can reduce the torque ripple of a motor. An SPM drive unit includes a plurality of high side transistors and low side transistors coupled to drive terminals of multiple phases respectively, and applies drive voltages to the drive terminals, using a PWM signal. A back electromotive force voltage phase detection unit detects each of back electromotive force voltage phases of the multiple phases. A drive voltage phase generation unit determines one of drive voltage phases in each of the multiple phases at the time of applying the drive voltages so that each of drive current phases of the multiple phases has a phase variation opposite in direction and equal to each of relative phase variations of the back electromotive force voltage phases of the multiple phases.