| Since this century,electromagnetic actuator has been widely used in switching appliances,and its performance and power consumption are self-evidently important for switching appliances.Because the residual magnetism generated by the hysteresis characteristic of the magnetic material of the electromagnetic actuator will slow down the reset time of the moving iron core of the electromagnetic actuator,or even reject it,in engineering,the residual magnetic gap technology is usually used to suppress the residual magnetism,The key problem of this technology is that the gap size is often set by experience,if it is set too much,it will generate unnecessary power consumption.if it is too small,it will cause the problem of incomplete suppression of residual magnetism.The reason for this problem is that the current electromagnetic calculation of the electromagnetic actuator uses the basic magnetization curve of the magnetically conductive material.Although this calculation method can guarantee a certain accuracy,it cannot accurately analyze the residual magnetism generated by the hysteresis characteristics of the magnetically conductive material.Therefore,the key problem of the design method of the residual magnetic gap of the electromagnetic actuator is how to solve the hysteresis modeling of the magnetic conductive material of the electromagnetic actuator and the electromagnetic calculation under the hysteretic effect.Firstly,this paper analyzes the magnetic properties of the ferromagnetic materials used in the magnets of the electromagnetic actuator,and builds an experimental platform for measuring the magnetic properties of the ferromagnetic materials,thus obtaining the magnetic properties data of the magnetic materials commonly used in electromagnetic actuator.And the JA model is used to model the hysteresis of the ferromagnetic material,and the appropriate optimization algorithm is used to identify and correct the JA model parameters based on the experimental data.Secondly,analyze the working characteristics of the electromagnetic actuator under the hysteresis effect,and use the hysteresis-finite element method combining the JA hysteresis model and the finite element model,the electromagnetic calculation of the typical structure of the electromagnetic mechanism under the hysteresis effect is performed.In addition,a systematic analysis has been made on the influencing factors of the residual magnetism of the electromagnetic actuator and the influence of the residual magnetism on the dynamic characteristics of the electromagnetic actuator.Finally,taking the electromagnetic actuator of a certain type of contactor as an example,a parametric analysis of the size of the residual magnetic gap is established,And an optimized mathematical model was established and the hysteresis-finite element method and grid search method were used to optimize the design of the residual magnetic gap and coil parameters.The results shows that the guaranteed performance based on electromagnetic mechanism effectively reducing the electromagnetic power means,the power consumption of the electromagnetic mechanism is effectively reduced,and the negative effect of the gap size often set by experience is eliminated. |
