2004 Volume 124 Issue 6 Pages 859-865
Electromagnetic field analysis coupled with motion using the tableau approach has been applied to high speed circuit breakers of eddy current repulsion mechanisms. This breaker has an opening time of 1ms and a break time less than 1 cycle (20ms). The driving part of the breaker is composed of electromagnetic repulsion mechanisms and disk springs with nonlinear characteristics. The mechanisms are composed of two fixed coils and one repulsive plate. A numeric experiment has been applied about the dynamic behavior of the electromagnetic repulsion mechanism using the equivalent circuit method. Calculation results were good agreement with both of measurement results and calculation results by FEM on an experimental model. In addition, repulsion forces depending on material conductivities have been researched.