Efficiency issues in variable-capacitance micromotor drives

Abstract

Efficiency issues of variable-capacitance micromotors are discussed in context of combined drive and motor interaction. It is shown that variable-capacitance motors ideally have nearly perfect energy conversion efficiency and constant torque if constant voltage is applied. However, the drive system consisting of both the motor and electronics is not ideal when considering different methods for charging capacitive devices. Constant-voltage vs. constant-current charging is explored. Simulation is used to clarify the theoretical concepts discussed.