Abstract
This paper proposes a novel breaking strategy for dramatically shortening the response time of a single, stable electromagnetic contactor. A reverse voltage was applied across the excitation coil to increase the decay velocity of the magnetic field in the iron core, leading to a dramatic reduction of the electromagnetic force when the contactor initiated the breaking process. The applied time of the reverse voltage was determined by numerical computation of circuit, magnetic field, and forces. The polarity of source voltage was overturned by controlling switching devices in the bridge drive circuit. A co-simulation coupling magnetic field, machinery, and circuit was carried out using Maxwell and Circuit Editor software. Experimental results are reported to demonstrate the effectiveness of the proposed breaking strategy for shortening the response time of an electromagnetic contactor.
Highlights
Electromagnetic contactors are widely used in power systems to switch the main circuit on and off, the performance of which directly affects the safety and stability of the power system and the controlled equipment [1,2,3,4]
An experimental setup including a prototype of the single stable electromagnetic contactor, an intelligent control unit, a drive circuit, and some power supplies, was established to verify the effectiveness of the proposed breaking strategy
This paper successfully proposes a novel breaking strategy for shortening the response time of electromagnetic contactors
Summary
Electromagnetic contactors are widely used in power systems to switch the main circuit on and off, the performance of which directly affects the safety and stability of the power system and the controlled equipment [1,2,3,4]. In [6], a nonlinear transient finite element analysis with strong circuit coupling was presented, discussing both current and voltage drive models. In [7,8], a closed-loop control strategy for contactors was proposed, which was based on measuring voltage and current signals; the strategy adopted Pulse Width Modulation (PWM) to flexibly modify the coil energization to effectively control the electromagnetic force. Some sensorless schemes have been proposed to control the closure of contactors to reduce contact bounce [9,10,11]. The current hysteresis-band control has been employed to control the excitation coil current, which can reduce unnecessary energy consumption and ensure the reliable closure of contact during the holding process [12,13]
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