US 12,267,029 B2
Method for obtaining parameter of synchronous motor
Yen-Yang Chen, Taoyuan (TW); Jen-Chih Tseng, Taoyuan (TW); and Lei-Chung Hsing, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Jan. 18, 2023, as Appl. No. 18/098,121.
Claims priority of application No. 202211206154.7 (CN), filed on Sep. 30, 2022.
Prior Publication US 2024/0113646 A1, Apr. 4, 2024
Int. Cl. H02P 21/22 (2016.01); H02P 21/14 (2016.01)
CPC H02P 21/22 (2016.02) [H02P 21/14 (2013.01); H02P 2207/05 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for obtaining a parameter of a motor being applied to an inverter and comprising:
a) setting an operating current value of the motor;
b) providing a positive fixed voltage to the motor and detecting a feedback current of the motor by the inverter;
c) recording a touch time when the feedback current reaches the operating current value, and providing continually a negative fixed voltage to the motor for the touch time, wherein the touch time is a period of time, and the touch time is counted when starting to detect the feedback current and ended counting when the feedback current reaches the operating current value;
d) obtaining a square wave voltage with a fixed frequency based on the positive fixed voltage and the negative fixed voltage;
e) applying the square wave voltage with the fixed frequency to a first axis of the motor;
f) detecting a three-phase current fed back by the motor and converting the three-phase current into an axial current of the first axis;
g) calculating a first inductance value of the first axis based on the fixed frequency, voltage values of the positive fixed voltage and the negative fixed voltage of the square wave voltage, and a current value of the axial current; and
h) establishing and storing a parameter table of inductance versus current according to the first inductance value and the current value of the axial current.