An Extended Model for Ripple Analysis of 2–4 Phase Resonant Electrostatic Induction Motors

Abstract

Electrostatic motors are promising forms of actuation for future robotic devices. The study of their different implementations should accelerate their adoption. Current models for resonant electrostatic induction motors were found not to be able to properly describe their behavior, namely, with regard to changes with position. This paper reports a new analytical model for these motors, aiming to address this issue. The model is based on identification of all capacitance harmonics, through a simplified method. Using these, equations for different motor parameters, notably, thrust force, were obtained and compared to previous literature. The new equations model position dependent properties, such as force ripple. The outputs of this model were validated through experimentation with a prototype, with the results confirming the new model better describes motor behavior. An analysis into how to decrease this ripple was also discussed and tested. We concluded that the use of a higher number of harmonics resulted in a much more accurate model, capable of adequately characterizing motor outputs with changes in position.

Development of Electrostatic Microactuators: 5-Year Progress in Modeling, Design, and Applications

“…A resonant electrostatic induction micromotor with two to four phases was reported in [105]. It consists of two polymeric films with evenly spaced parallel copper electrodes.…”

Slider Sheet Detection in Charge-Induction Electrostatic Film Actuators

“…An electrostatic film actuator is realized using dielectric films, or sheets, that contain multi-phase electrodes. Various different configurations and driving principles have been proposed so far, which include charge induction [ 18 ], synchronous (variable capacitance) [ 10 ], capacitive voltage induction [ 19 ], and LC-resonant voltage induction [ 20 , 21 ]. Among these, the synchronous type showed superior output performance, such as thrust force in the order of a hundred newtons in a linear configuration [ 10 , 14 ].…”