In order to meet the needs of high position accuracy,fast dynamic response,and short motion travel of the 6-DOF vibration isolation platform(VIP).A novel four-quadrant Lorentz force motor(FQLFM)applied on the 6-DOF VIP is designed.The structure of this LFM has low force fluctuation and low coupling force.First,the basic structure and operating principle of the proposed FQLFM are presented.Second,the expressions of the magnetic field and electromagnetic force are obtained based on an equivalent current model and permanent magnet mirror method.Then,different structural parameters on the distribution of air gap magnetic field and electromagnetic force are analyzed.Third,the parameters for thrust density are optimized based on genetic algorithm considering of force fluctuation and coupling force.Finally,based on the proposed electromagnetic force model of FQLFM,3D finite element simulation and experimental verification are conducted.The experimental results show that the force fluctuation and the coupling force of the designed motor are less than 0.23％and 19.3 mN,respectively,when the coil current of the designed motor is 5 A,and the motion displacement of the displacement machine in y and z direction is-1 mm～l mm.
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