公开(公告)号：US12267029B2

公开(公告)日：2025-04-01

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

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.

公开(公告)号：US11531067B2

公开(公告)日：2022-12-20

申请号：US17363502

申请日：2021-06-30

Applicant: Delta Electronics, Inc.

Inventor： Shao-Kai Tseng ,  Jen-Chih Tseng ,  Sheng-Han Wu

IPC: G01R31/34 ,  H02K11/21 ,  H02P6/17 ,  G01R33/12

Abstract: A motor demagnetization detection method includes the following steps. The speed of a motor is calculated according to the rotation angle of the motor. When determining that the motor respectively maintains a first and second steady state according to the speed, the three-phase current values of the motor are received to obtain first and second steady-state data. An equivalent magnetic flux is calculated according to the first and second steady-state data. The motor is repeatedly driven to maintain the first and second steady states, the first and second steady-state data are updated according to the three-phase current values, and the equivalent magnetic flux is again calculated to generate equivalent magnetic fluxes. A magnetic flux change is calculated according to equivalent magnetic fluxes. A demagnetization warning is issued according to a comparison of the magnetic flux change and a demagnetization warning value.