For rotating electromagnets (Solenoid/Solenoid, exert positive current) in the upper left in the form of electromagnetic N arc and S very, magnetic Rotor (for its intrinsic magnetic Rotor), in the opposite polarity rejection swinging Rod (Swing driving under the Rod) to spin clockwise, rated load and (in the rated voltage condition from the coil electricity, swinging Rod location to spin to the position of the time response time) then electromagnets (Solenoid/Solenoid) lose current and magnetic, magnetic Rotor inherent microwave absorbing by swinging Rod and help to keep arc. Then give the electromagnet (Solenoid/Solenoid pulse current reverse direction), formed in the opposite arc, S and N a magnetic Rotor (Rotor) swinging Rod Rod Swing (counterclockwise) returns to the state, as shown in the pulse current interrupted by magnetic Rotor intrinsic magnetic after.