公开(公告)号：US20240322724A1

公开(公告)日：2024-09-26

申请号：US18578108

申请日：2022-06-01

Applicant: Hitachi Astemo, Ltd.

Inventor： Hiroaki SATO ,  Daisuke GOTO ,  Katsuya IWASAKI

IPC: H02P21/22 ,  B60T13/74

CPC classification number: H02P21/22 ,  B60T13/74 ,  H02P2207/05

Abstract: A synchronous motor driving device which accurately estimates and limits direct current (DC), without a dedicated current detection sensor. The device includes a first DC calculation unit that calculates a first DC based on a first voltage command value, a current value of a winding of a synchronous motor, and a battery voltage; a second DC calculation unit that calculates a second DC based on a current value of the winding of the synchronous motor, a rotation speed of the synchronous motor, and a predetermined motor characteristic; a model error extraction unit calculating inverter efficiency based on the first and second DC; a DC correction unit that calculates an estimated DC on the basis of the first and second DC, and the inverter efficiency; and a DC limiting unit that corrects a current command value of the winding based on the estimated DC and a predetermined DC limit value.