In this paper, a new type of electrical actuator, an electromagnetic force driving actuator (EMFA), has a high performance, durability, and accuracy of its operation for high-voltage vacuum circuit breaker (HVCB) is presented. Transient analysis is performed to obtain the dynamic characteristics of the EMFA connected three-link type of free body frame. The distribution of static magnetic flux is obtained by using the finite element method (FEM). The coupled problems of electrics and mechanics, what equilibrium of a rigid body, are solved by using the time difference method (TDM). Fabrication and experiments were performed to prove its applicability for HVCB. In comparing optimized simulation with experiment data, it is confirmed that EMFA is appropriate actuator for HVCB. XXIII-rd Int. Symp. on Discharges and Electrical Insulation in Vacuum -Bucharest -2008 978-1-4244-2841-0/08/$25.00 ©2008 IEEE

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This paper presents a 2-D analysis of synchronous reluctance motors (SynRMs) considering the end-plate effect. In an electric machine with a laminated steel core, an end-plate is often attached to the rotor core to support the structural robustness of the machine. End-plates occasionally comprise carbonsteel, which changes the magnetic behavior of the electric machine. Thus, an electric machine that utilizes the 3-D finite element analysis (FEA) should be designed to consider the comprehensive magnetic flux path. However, the application of 3-D FEA for the whole design process is computationally expensive. Therefore, we proposed a 2-D FEA-based design strategy that can consider the additional magnetic path of the endplate for SynRMs. The proposed analysis method was developed based on the magnetic equivalent circuit analysis and d-and q-axis flux linkage calculation. The effectiveness of the proposed method was verified by presenting the actual design case of a SynRM and via an experimental study.INDEX TERMS End-plate, finite element analysis (FEA), magnetic equivalent circuit (MEC), synchronous reluctance motor (SynRM).