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.
Study of AC contactors during voltage sags
This paper proposes a model for the dynamic analysis of AC contactors. The model equations are presented and the implementation of the calculation algorithm is discussed. The high calculation speed of the implemented algorithm allows an extensive set of voltage sags to be studied, and their impact on the contactor performance to be analyzed. The contactor sensitivity CBEMA curves are obtained for different initial voltage phases at the voltage drop point. In particular, the CBEMA curve for 90/spl deg/ of initial voltage phase (i.e. when the voltage at the start of the sag is zero) is studied and justified.
Finite element dynamic analysis for the electromagnet of AC contactor
The finite element analysis of the dynamic characteristics for the electromagnet of an AC contactor during its starting process is discussed. This is a coupled problem of electromagnetic fields, transient circuits, and mechanical movement. The parameter coupled method is adopted to resolve differential equations. This method is applied to design a typical 32 A AC contactor. >