公开(公告)号：US20240113646A1

公开(公告)日：2024-04-04

申请号：US18098121

申请日：2023-01-18

Applicant: DELTA ELECTRONICS, INC.

Inventor： Yen-Yang CHEN ,  Jen-Chih TSENG ,  Lei-Chung HSING

IPC: H02P21/22 ,  H02P21/14

CPC classification number: H02P21/22 ,  H02P21/14 ,  H02P2207/05

Abstract: A method of obtaining a parameter of a synchronous motor is disclosed and includes: setting an operating current of the motor; providing a positive fixed voltage to the motor and monitoring a feedback current from the motor; recording a triggering time for the feedback current to reach the operating current; providing a negative fixed voltage to the motor for the triggering time; obtaining a square-wave voltage with a fixed frequency based on the positive fixed voltage and the negative fixed voltage being provided; providing the square-wave voltage with the fixed frequency to one axis of the motor; transforming three-phase current from the motor into an axial current; computing an inductance value of this axis based on the fixed frequency, the square-wave voltage and the axial current; and, creating an inductance-current parameter table based on a plurality of the inductance values and the axial currents correspondingly.