Study on the Restarting Method of Induction Motor under Speed-sensorless Control

doi:10.11985/2022.03.015

Abstract

Abstract:

In some special applications, the free-running induction motor needs to be put into operation after short power interruption. In the case of speed-sensorless control, the initial speed of the motor is needed to realize the restarting procedure. Therefore, a single-current closed-loop DC injection method is introduced to obtain the initial speed of induction motor in a short time. The characteristics of free-running induction motor under power interruption are analyzed, the mathematical model of induction motor under signal-current closed-loop DC injection is established, and the method of measuring feedback current frequency to estimate initial speed is analyzed. At the same time, the switching strategy from single-current closed-loop DC injection to full-order adaptive observer is proposed. Finally, the effectiveness of the proposed method is demonstrated by simulation.

Key words: Induction motor, restarting strategy, full-order adaptive observer, DC injection

CLC Number:

TM921

YIN Shaobo. Study on the Restarting Method of Induction Motor under Speed-sensorless Control[J]. Journal of Electrical Engineering, 2022, 17(3): 130-137.

Figures/Tables 10

References 20

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实际电机转速/Hz	观测转速/Hz	观测误差(%)
10	8.86	-11.4
20	19.16	-4.2
30	29.24	-2.5
40	39.37	-1.5
50	49.5	-1.0
60	58.82	-1.9
80	79.37	-0.78
100	98.04	-1.96
120	122	1.6
140	142.9	2.0
160	156.3	-2.3