Research Of Sensorless Control Technology On Permanent Magnet Linear Synchronous Motor

In the 21st century, with the high-tech rapid rising, the machine’s performance indicators have to usher in rougher standards and face a more serious situation. In our country, motor has experienced the independent innovation development of the electrical machinery structure and the technical unceasing improvement, Because of daily expansion of the industry demand, more and more enterprises and experts are paying attention to linear motor. Along with the continuousness processing technology of the high speed precise numerical control engine bed, the standard of the processing quality and the efficiency is higher, and the traditional type of drive is not satisfied gradually. Permanent magnet linear synchronous motor (PMLSM) has it’s own advantageous in the modernization control system in terms of speed, accuracy and efficiency. At the same time, it also can low speed smooth movement and not be influenced by the thrust force pulsation. The traditional mechanical installment about the sensor can increase the system drives cost. What’s more, it makes the maintenance tedious and causes the work load fill-out. It also can increase the rotation inertia and has certain degree static state and the dynamic friction. In some situation restricted by the temperature, the humidity and the vibration condition, the performance and the precision of the sensor drop, even it is unable to install in some situations. Although above so, the essential of rotor magnetic pole position causes non-sensing control technology of the PMLSM to become a hot spot in the field of motor control. Therefore, how to get the speed and position quickly and accurately is a starting point in this paper.First of all, the basic structure and basic principle of PMLSM was described in this article. Then, the mathematical model of motor is established under the d-q coordinate system on the basis of analyzing the coordinate vector transformations. Secondly, this article detailed vector control principle and the SVPWM modulating technology, as well as the model of the vector control system has completed under the simulation environment. A new solution to speed and position estimation is proposed for a PMLSM based on Fuzzy sliding mode observer, which combines the advantages of sliding mode observer and fuzzy controller respectively based on the vector control system and the traditional sliding mode observer methods. Then, the simulation model of system without position sensor has been established in MATLAB7.1, and has been carried on, which verify the effectiveness of this method. The simulation results show that Fuzzy sliding mode observer is able to find a balance between soft chattering and steady-state error, keep the system robustness and control precision. Finally, on the basis of the theory and simulation analysis, the software and hardware circuit of the system has been designed.