Research on Offline Parameters Estimation of Induction Motors

doi:10.11985/2016.07.003

Abstract

Abstract:

A parameter identification method of induction motors under the static state was proposed, which was based on PWM inverter-motor platform. The appropriate frequency and method was selected by analyzing the equivalent circuit of induction motor under different frequency of input current. Instead of the traditional current loop controller, a simple open-loop control strategy was adopted at the single-phase test. The stator current was upraised by adding DC offset voltage until the DC component of stator current is greater than the amplitude of the fundamental component, which effectively solves the influence of dead zone and other nonlinear factors. Finally, the identification algorithm was proved to accurately identify all the parameters of the induction motors.

Key words: Parameter identification, equivalent circuit, open-loop control strategy, DC offset voltage

CLC Number:

TM346 ⁺.2

Xiaobing Xu,Xiaojia Qin,Jianping Wang. Research on Offline Parameters Estimation of Induction Motors[J]. Journal of Electrical Engineering, 2016, 11(7): 18-22.

Figures/Tables 6

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Tab.1

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Tab.2

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频率/Hz	0	0.1	3	50
近似条件	X_m′ =X_σ= 0	X_m′<<R_r′	X_m′ ≈R_r′	X_m′>>R_r′
R_eq	R_s	R_s	R_s+ $\frac{R'^{2}_{r}X'^{2}_{m}}{R'^{2}_{r}+X'^{2}_{m}}\qquad$	R_s+ R_r
X_eq	0	X_σ+ X_m′	X_σ + $\frac{R'^{2}_{r}X'_{m}}{R'^{2}_{r}+X'^{2}_{m}}\qquad$	X_σ

参数	真实值	辨识值	误差（%）
R_s/mΩ	86.0	85.7	0.35
σL_s/mH	2.41	2.42	0.41
R_r/mΩ	53.7	52.0	3.17
L_m/mH	28.9	29.6	2.42

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