Design and Optimization of Lorentz Actuator with Good Linearity, Large Stroke, and Low Heat Dissipation for Micro-vibration Isolation

The maglev technology is an effective way to overcome the adverse influence of micro vibration on space activities, especially in low frequency range. In order to provide quasi static environment, the working principle of a maglev vibration isolation platform with Lorentz actuator was discussed. The parameterized model of the Lorentz actuator was established and the parameters that would affect the mechanical function of the Lorentz force were analyzed by finite element method. To acquire an optimum Lorentz actuator with good linearity, large stroke and low heat dissipation, optimization was carried out and the optimum design parameters of the Lorentz actuator can be obtained. The relationship between the current and the Lorentz force was simulated by Maxwell software. And the linearity of the kind of actuator was verified by comparing the differences of the force constant at different coil locations.