A Calculation Method of Dynamic Characteristics of Contactor Based on Piecewise Linear Kinetic Equation

Abstract

Provided is a method for calculating dynamic characteristics of a contactor based on a piecewise linear kinetic equation, and belongs to the technical field of basic research design of general characteristics of contactors. The method comprises the steps that according to structural features of the contactor, segmentation is conducted on a contactor action process, plane collision and a continuouscollision force model with energy loss considered are used for being equivalent to a collision process, by means of the multi-body system kinematics based on a restrain method and a dynamic method, studying of the collision bounce situation of a contactor mechanical system under the action of external force is completed, and finally, dynamic characteristic calculation of the contactor with collision bounce considered is completed in combination of a coupling calculation method. The method has the advantages that the time-dependent situation of electromagnetic parameters such as the coil current and electromagnetic force in a working process of the contactor can be obtained, the electromagnetic dynamic characteristics of the contactor can be reflected more accurately, and errors are controlled within 5%; the bounce situation of an armature and a moving contact of the contactor can be reflected more really, and errors are controlled within 5%.

Description

technical field [0001] The invention belongs to the technical field of common basic research and design of contactors, and in particular relates to a method for calculating dynamic characteristics of contactors based on piecewise linear dynamic equations. Background technique [0002] Contactors are mainly used for frequent switching on of the main circuit and on-off switching of large-capacity control circuits under normal conditions. The performance of the contactor is related to the stability of the entire circuit system. The dynamic characteristics of the contactor include electromagnetic dynamic characteristics and mechanical structure dynamic characteristics, which are important indicators to measure the reliability of the contactor. Bouncing is an unavoidable phenomenon of switching devices. The short-term separation of moving and static contacts caused by it is very easy to aggravate electrode erosion and deteriorate the contact environment in the case of arcing. It ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the vacancy of multidisciplinary interdisciplinary and multi-field coupling calculation of the current contactor dynamic characteristic modeling; the low efficiency of multi-software joint simulation calculation; the problem of accurate calculation of the dynamic characteristic of the contactor considering the impact and bounce, to provide a The calculation method of the dynamic characteristics of the contactor based on the piecewise linear dynamic equation specifically relates to a calculation method of the abstract mathematical model of mechanics based on practical problems. Based on the piecewise linear dynamic equation and the continuous collision force theory of multiple rigid bodies, the constrained method is adopted. The kinematics and dynamics calculation method, combined with the electromagnetic finite element model for coupling solution, can visualize the movement process of the contactor, and can reflect the bouncing situation of the contactor, which can be used for subsequent research and verification. Impact provides a fast and reliable method for calculating dynamic characteristics

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