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Optimisation of design parameters to improve performance of a planar electromagnetic actuator (2402.13436v1)

Published 21 Feb 2024 in physics.app-ph, cs.SY, and eess.SY

Abstract: Planar electromagnetic actuators based on the principle of linear motors are widely employed for micro and nano positioning applications. These actuators usually employ a planar magnetic platform driven by a co-planar electromagnetic coil. While these actuators offer a large motion range and high positioning resolution, their actuation bandwidth is limited due to relatively small electromagnetic stiffness. We report optimization of the design parameters of the electromagnetic coil and the magnetic assembly to maximize the electromagnetic force and stiffness. Firstly, we derive closed-form expressions for the electromagnetic forces and stiffness, which enable us to express these quantities in terms of the design parameters of the actuator. Secondly, based on these derived expressions, we estimate the optimum values of the design parameters to maximize force and stiffness. Notably, for the optimum design parameters, the force and stiffness per unit volume can be increased by two and three orders of magnitude, respectively by reducing the pitch of the electromagnetic coil by a factor of 10. Lastly, we develop an electromagnetic actuator and evaluate its performance using a Microelectromechanical system (MEMS) based force sensor. By operating the force sensor in a feedback loop, we precisely measure the generated electromagnetic forces for different design parameters of the actuator. The experimental results obtained align closely with the analytical values, with an error of less than 15%.

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