Study On Ironless Moving Coil Linear Permanent Magnet Synchronous Motor

Linear Permanent Magnet Synchronous Motor (LPMSM) is one kind of linear motors to which researchers pay more attention in recent years. LPMSM has been applied to linear servo system widely for it's high reliability and advanced dynamic response. The subject of this thesis is to study ironless moving coil linear permanent magnet synchronous motor and the major works in this thesis are summarized as follows:1) Two analytical formulas are derived by concentrated current method and distributed current method to determine the magnetic field due to PM, based on the current model of PM. Besides, two method (magnetic charge method and solution by Laplace equation method) are also introduced with comparing their advantages and disadvantages. Then the effects of the motor parameters on the flux distribution are discussed.2) According to the law of F-BIL, the formula to calculate the thrust of ironless moving coil linear PM synchronous motor is obtained. So that the static characteristic of thrust vs.-displacement may be determined.3) The model for dynamic simulation of LPMSM is realized under MATLAB/SIMULINK. environment. The simulation of starting, steady state characteristics of a test motor under different drive modes are investigated.