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.
Heat Transfer Characteristic for a New Plate Metal Hydride Reactor
The property of major metal hydride reactors in the world was analyzed and a new plate metal hydride reactor was designed.An experimental facility to test the metal hydride reactor was also designed correspondingly.The effective thermal conductivity of the plate metal hydride reactor was measured by varying the initial metal hydride packing fraction,the kind of filled gas and the pressure of the filled gas,cycle numbers.The test results show that the effective thermal conductivity of the reactor,has exceeded(7.5) W/(m·K) before activation,which is increased greatly.After alloy activation,the effective thermal conductivity of the reactor has a linear change trend with the hydrogen pressure during the interval 0.1~3.5 MPa.The effective thermal conductivity of the reactor just only decreases quickly at the beginning,but becomes stable after several cycles.