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Active and Passive Electronic Components
Volume 2009, Article ID 609298, 12 pages
Research Article

Applying Closing Phase-Angle Control Technique in Bounce Reduction of AC Permanent Magnet Contactor

Department of Electrical Engineering, Chienkuo Technology University, No. 1, Chieh Shou N. Road, Changhua City, Taiwan

Received 9 August 2008; Revised 14 February 2009; Accepted 14 May 2009

Academic Editor: Ashok Goel

Copyright © 2009 Chieh-Tsung Chi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A new low-cost electronic control circuit actuator is proposed for minimizing the bouncing times of an AC permanent magnet (PM) contactor after two contacts closing. The proposed new actuator overcomes the bouncing problem of an uncontrollable restrictions imposed by previously conventional AC electromagnetic (EM) contactor based on the minimization of kinetic energy prior to two contacts impact. By choosing the closing phase angle of coil voltage on purpose, the bouncing problems of the movable contact during the closing process are then overcome. The using life of contacts is then prolonged and their operating reliability is improved as well. In order to validate the feasibility and effectiveness of the proposed method here, several simulation and experimental procedures were performed on a prototype of AC PM contactor in the laboratory. Testing results actually showed that bouncing problem of contactor's contacts during the closing process was to be controlled by using the proposed technology.