Research On The Control Solution Of Permanent Magnet Linear Synchronous Motor

With the development of the CNC machine tools in the world, How to improve the production rate and how to reduce the cost is the most important issue of the machinery processing industry.In recent 10 years, the servo system with linear motor was preferred to be used in the CNC machine tools because of cost-reducing, high speed, high acceleration and high accuracy.The dissertation based on a Permanent Magnet Linear Synchronous Motor (PMLSM) which is developed for a high level CNC machine tool. With the co-simulation of simulink and Magnet, the problems of the PMLSM controlling are analyzed to fufill the performance destination. All of the work provide guidance to the circuit designing and the software designing.The dissertation takes account into the end effect and the field harmonics of PMLSM with the consideration of the model of the synchronous rolling machine, presents the overall mathematic model, which includs the flux equation, voltage equation, and magnetic force equation. The model exhibts highly-coupled, nonlinear, multi-variable structure. Then the dissertation presents the decouple model with the current vectors control solution.Based on the engineering drawings of PMLSM, the finite element model is created in Magnet. With the co-simulation of simulink and Magnet, the finite element model is decoupled and different control solutions are applied on it. The voltage source SVPWM is applied to drive the motor. And a new method to get the parameters of the d-q axis inductance is presented. Phase indentification of PMLSM with the position orientation is presented too, and it estimates the error of the method and the actual method.Designing the positon cycle, velocity cycle, current cycle with the PID method and get the parameters with Kessler form.Direct thrust ripple compensation, current hamonics compensation and disturbance observer are expectively applied to solve the thrust ripple problem and present the analysis.