Finite Element Analysis Of Magnetic Levitation Planar Motor

Magnetic levitation planar motor is a new type of drive-component which research is still a blank filed in our country. Without mechanical support-element, the magnetic levitation planar motor has merits at high reliability, varying structural style and advanced dynamic response. This paper researches on moving coil magnetic levitation planar motor for the sake of offering assistance for the design of the planar permanent magnet motor. And the main research are as follows:First,the analytical mathml are deduced by the harmonic analysis to ascertain the magnetic field due to MLPM,and the calculation of formula and torque of the moving coil planar MLPM is obtained. To decouple the control of the 6-DOF motions,this paper presents the current-controlled model of planar motors as the electromagnetic actuators,the decoupled kinetics model based on the modal forces,and the decoupling control strategy of the planar motor.Second,this paper summarized and described systematically the fundamental principles and the development of electromagnetic field in the motor,and adopted 2D/3D whole field finite element method (FEM)based on Ansoft software to calculate the magnetic field distribution and static characteristics of the planar PM motors. According to the results of no-loading and loading electromagnetic analysis,the effects of permanent magnet thickness, magnet material attribute,air-gap height and on the permanent magnet flux linkages and electrical torque are concluded,and the results would be used in optimizing design of the planar permanent magnet motor.Third,this paper described the ideas of the design of a planar motor. The novel structure which one rotor is set between two stators makes the motor gain larger torque output. The magnetic flux density B in the stator with multiple layers is not a constant, which affects the design of main parameters of the planar motor. It was put forward that genetic algorithms (GA) are used for optimization of the parameters to satisfy the constraint satisfaction problems in the design of planar motor. After the simple mathematical models of electromagnetic planar motor being drawn, the objective function that is the only dynamic to guide the search of GA can be defined combining with the specific targets of the design. By the search in the space of parameters, the fittest parameters of the planar motor will be obtained. It has been proved by simulations that satisfactory results can be obtained with the optimal design of planar motor, which has a great significance in the study and the application of planar permanent magnet motor.