Displacement Control Strategy of AC Contactor Based on Sensorless Technology

doi:10.16628/j.cnki.2095-8188.2024.10.001

Abstract

Abstract:

Aiming at the problems of low reliability and poor precision of traditional contactor control model,a dynamic simulation and analysis method of AC contactor suction process based on sensorless technology is proposed.Firstly,according to the magnetic circuit model of AC contactor,the displacement formula of moving iron core of AC contactor is deduced,and the displacement estimator is formed.Based on the displacement estimator,the suction force is predicted,and a closed-loop controller is designed according to the control model.Then,the dynamic closed-loop control simulation model of AC contactor is established,and the closing time of AC contactor in three modes of uncontrolled,PWM time-sharing control and displacement feedback closed-loop control is compared and analyzed,which proves that the displacement closed-loop control scheme has remarkable effectiveness.Finally,the experimental results confirm the accuracy of the model and the practicability of the control strategy,and provide some ideas for the intelligent control of AC contactor.

Key words: AC contactor, dynamic characteristic simulation, suction prediction, PWM control, closed-loop control

CLC Number:

TM572.2

ZHANG Junhui, LIU Shuxin, LIU Yang, XING Chaojian. Displacement Control Strategy of AC Contactor Based on Sensorless Technology[J]. LOW VOLTAGE APPARATUS, 2024, 0(10): 1-6.

Figures/Tables 14

References 12

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线圈电压/V	合闸时间/ms
线圈电压/V	未控制	PWM分时控制	闭环控制
180	22.48	23.82	21.32
190	21.51	23.72	21.12
200	21.49	22.58	20.92
210	21.38	22.12	20.73
220	20.72	21.22	20.68
230	20.16	20.95	20.40
240	19.58	20.70	20.58
250	18.93	20.45	20.65

线圈电压/V	闭合末速度/(m·s^-1)
线圈电压/V	未控制	PWM分时控制	闭环控制
180	1.18	0.86	0.89
190	1.39	0.84	0.92
200	1.42	0.91	0.86
210	1.48	0.94	0.72
220	1.58	0.98	0.77
230	1.65	1.08	0.74
240	1.73	1.12	0.85
250	1.76	1.23	0.82

控制电压/ V	闭合末速度/ (m·s^-1)	弹跳时间/ ms	合闸时间/ ms
180	0.89	0.71	20.6
190	0.92	0.75	21.4
200	0.86	0.81	21.3
210	0.72	0.77	20.9
220	0.77	0.76	20.7
230	0.74	0.68	20.4
240	0.85	0.72	20.5
250	0.82	0.66	20.6

负载条件	闭合末速度/ (m·s^-1)	弹跳时间/ ms	合闸时间/ ms
恒定负载	0.94	0.71	20.8
可变负载	0.87	0.68	21.5

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