Calculation of the winding data of the on and off coils of a bistable polarized electromagnet for a vacuum medium voltage contactor

Medium voltage vacuum contactors consist of switching and drive modules. When developing or improving the designs of contactors, the switching module must meet the requirements set forth by their manufacturers. In accordance with these requirements, a drive module is being developed, which consists of a mechanical system and an electromagnet. The operation of the mechanical system of the contactor depends on correctly selected contact springs, and the operation of the electromagnet depends on traction forces during switching operations. The design of a vacuum contactor with a bistable polarized electromagnet with two ON and OFF coils is considered in the article. The counteracting characteristic of the mechanical system of the contactor is constructed and the forces acting on the electromagnet in the ON and OFF positions of the contactor are determined. The FEMM model of a bistable polarized electromagnet was developed and the minimum MMF value of the ON and OFF windings was determined. The resulting traction characteristic of a bistable polarized electromagnet is constructed at the minimum MMF value of the ON and OFF winding sand the working gap. It was determined that when performing the switching operation and using the ON and OFF winding at the same time, it was possible to reduce the MMF of the electromagnet operation. The winding data of the ON and OFF coils were calculated at different values of the nominal diameter of the wire and the voltage of the power supply network, and, in accordance with this, the minimum value of the MMF of the windings was determined