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Design of a Power Amplifier for Magnetic Actuation and Study on Its Actuation Characteristics

A revolving electromagnetic mechanism composed of a stator and rotor has been designed for boring of non-circular hole. While the currents in the pole-pairs coils on the stator change, the actuation force would change correspondingly and drive the rotor to take a wanted micro displacement radialy. To realize the actuation of inductive load in high frequency the key is the design of a power amplifier. A double-coil exciting method has been analyzed, and voltage current amplifier have been designed, and actuation features of the power amplifier have been tested. The relationships among the source voltage, tracing frequencies, control currents and load inductions have been analyzed for the case that the source has a limitation of voltage supply. The performances of the power amplifier such as step response, amplitude frequency characteristic and racking characteristic have been studied experimentally and theoretically, and the results verify the effectiveness of the developed power amplifier.