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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.

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Abstract-The comfort of an ejection seat greatly influences the pilot's flight performance. To achieve the maximum comfort, a pilot needs to adjust the backrest and cushion of an ejection seat by operating its regulating assembly that is based on human-machine function allocation. It is evident that the comfort of an ejection seat has to be determined first before an effective regulating assembly can be designed. In this study, a simulation platform incorporating human body model, ejection seat and aircraft steering control system was established using computer-aided design techniques. With the virtual backrest and cushion obtained through the platform, experiments were conducted to simulate the pilot operation of an ejection seat for comfort. It showed that improving the ejection seat comfort could create an effective and comfortable driving environment for the pilot. The study provided a theoretical basis for designing the regulating assembly.