摘要
Electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility (EMC) in a static magnetic field, dynamic characteristics of a clapper relay in a uniform static magnetic field situation based on the finite element method (FEM) is studied. Influences of the magnetic field on dynamic parameters (delay time, pick-up time, end pressure, and final velocity) as well as a situation in which the relay cannot function normally are analyzed. Simulation reveals that the external magnetic field which weakens the relay’s air-gap field has a greater influence on the relay’s dynamic parameters than the one strengthening the field. The validity of the simulation is verified by measured results of coil current and armature displacement.
Electromagnetic relay is a widely used apparatus which usually works in a magnetic disturbance environment. To evaluate its electromagnetic compatibility （EMC） in a static magnetic field, dynamic characteristics of a clapper relay in a uniform static magnetic field situation based on the finite element method （FEM） is studied. Influences of the magnetic field on dynamic parameters （delay time, pick-up time, end pressure, and final velocity） as well as a situation in which the relay cannot function normally are analyzed. Simulation reveals that the external magnetic field which weakens the relay＇s air-gap field has a greater influence on the relay＇s dynamic parameters than the one strengthening the field. The validity of the simulation is verified by measured results of coil current and armature displacement.
基金
Project (No. 513230502) supported by the PLA General ArmamentDepartment of China
关键词
电器
电磁场
动力系统
静电力学
Dynamic characteristics, Uniform static magnetic field, Electromagnetic relay, Finite element method （FEM）,Electromagnetic compatibility （EMC）
