Performance Evaluation of Electromagnetic Safety Mechanisms Under Different Trigger Modes Based on Field-Circuit Coupling Model

Abstract

The surge voltage experienced by the elevator safety gear during operation is unavoidable. Consequently, various trigger modes have been designed to mitigate the surge voltage and improve response time. This paper introduces the principle of electromagnetic trigger mechanism and proposes a corresponding drive circuit. Additionally, a field-circuit coupling model of the electromagnet is established, based on the integration of circuit, electromagnetic field, and mechanical field principles. Simulation results demonstrate the effectiveness of reducing surge voltage by incorporating electronic components like resistor, capacitor, and diode in parallel within the trigger circuit. Furthermore, the PCTM (Parallel Capacitor Trigger Mode) is shown to significantly reduce surge voltage while having minimal impact on the response time. The simulation results are in agreement with experimental findings, which indicate a reduction to 38.5 V in surge voltages using PCTM, with a mere 6.5 ms extension in response time. The widespread application of this model and methodology holds significant value in ensuring the safe and reliable operation of safety gear in elevators.

Keywords

safety gear trigger modes electromagnet surge voltage response time

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