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.
Accurate electromechanical representation of a permanent magnet linear actuator using 3D finite element analysis
The increasing performance of simulation platforms coupled to the development of sophisticated numerical analysis tools makes more and more possible an approach to modelling complex electromagnetic devices in an innovative way, alternative to the well consolidated trial and error procedure, based mainly on analytical approaches, experience and prototyping. The design of electromagnetic actuators can be considered an interesting example of how a effective utilization of numerical methods can lead to optimized systems and components. The aim of the present paper is to show how from a simplified simulation model a high accuracy of the final behaviour of a device can be predicted.