Actuator Design of a New AC PM Contactor with Energy-Saving and Noise-Free Characteristics
Developments in power electronic switches and lowcost actuator based on an electronic control module (ECM) have made it possible to design and implement modern control strategies for a new AC permanent magnet (PM) contactor. Such an attempt has made in this work for a colenoid actuator controlling the AC PM contactor. Certain important issues in design including the making signal generator and its amplifier, breaking signal generator and its amplifier, exciting coils, and a voltage regulator have been resolved. The proposed scheme is validated through extensive numerical simulations and a laboratory scale implementation.
Static and Dynamic Analysis for Contactor with a New Type of Permanent Magnet Actuator
SUMMARY A new type of permanent magnet actuator driven by elec-tromagnetic repulsive force in breaking course and electromagnetic attrac-tion force during closing course is presented in this paper, and the staticand dynamic characteristics for contactor with this new type actuator aremainly focused on by simulation and experiment simultaneously. Firstly,the static electromagnetic attraction force in closing course and electromag-netic repulsive force in breaking course are studied by FEM simulation andexperiment. Secondly, by coupling of the electrical and mechanical dif-ferential equations, the dynamic electromagnetic attraction force in closingcourse and dynamic electromagnetic repulsive force in breaking course areobtained respectively. Thirdly, by constructing the mechanical model ofcontact system and permanent magnet actuator, the displacements of mov-ing contact and moving core while both contactors’ closing and breakingare obtained by simulation and experimental study. It is indicated that sim-ulation results coincide well with that of experiment.
A study on the permanent magnet overhang effect in permanent magnetic actuator using 3-dimension equivalent magnetic circuit network method
This paper presents the analysis of the permanent magnet overhang effect for permanent magnetic actuator. Generally, The overhang is often used to increase the force density in permanent magnet machineries. The overhang is especially profitable to reduce the volume after increasing the force density per volume when using the overhang effect of the permanent magnet. Therefore, 3D equivalent magnetic circuit network method (3D EMCNM) has been used in this paper. According to the plunger position, flux distribution per the overhang length, and the holding force are quantitatively compared. Furthermore, an appropriate length of the overhang has been proposed. To confirm the accuracy of the analysis method, the results of 2D FEM and 3D FEM are compared for the basic model.