Sensorless Control Of Permanent Magnet Synchronous Motor

Because of small size, high efficiency, high power factor, high starting torque,good power and low temperature rise, Permanent magnet synchronous motor is widely used in various fields. With the permanent magnet and permanent magnet synchronous motor control technology is becoming more and more nature, the application of permanent magnet synchronous motor will be more and more extensive.Considering the cost, installation conditions, space constraints and other factors.Sensorless control of permanent magnet synchronous motor is the research topic of this paper.At first, this paper analyzes the background and current situation of the research on this topic, introduced the common control methods of the permanent magnet synchronous motor. Comparing the control method of permanent magnet synchronous motor with the position sensor motor, analyzed the advantages of the synchronous motor control without position sensor, Therefor, there is great significance in the research of permanent magnet synchronous motor without position sensor.Then put forward the main theoretical basis and research methods of this paper. This paper introduces the structure and characteristics of the permanent magnet synchronous motor without position sensor, then puts forward the basic principle of vector control and the means to realize it. As to sensorless permanent magnet synchronous motor Position observer is used to calculate the rotor speed and position,This paper introduces the design principle and construction method of the position observer, In order to improve the control performance of the motor caused by dead time effect and zero current clamping effect, In this paper, we also analyze the key points and difficulties of the classical compensation method for dead-time effect, and a dead time compensation method based on the iterative control theory is proposed.Infineon XMC series chip platform with powerful compiler debugging environment, not only perfectly meet the synchronous motor control requirements, but also the object oriented design environment can greatly save the time and cost of theunderlying driver development, Model simulation technique can be used to visualize complex operation process, At the same time, the simulation process can better find the error and defects of the algorithm design, this paper we use the MATLAB/Simulink simulation platform, which can also directly transform the simulation model algorithm into code, the generated C files combine with the bottom drive perfectly. Building the vector control and position observer algorithm model by MATLAB/Simulink, to realize the high efficiency control of the permanent magnet synchronous motor without position sensor.Model simulation technology for the visualization of complicated operation process is simplified, and the simulation process can better find algorithm design errors and defects, based on the MATLAB /Simulink simulation platform, can also directly to the simulation model of the algorithm code, The speed, torque and power of the motor verify the control performance, and the method of iterative compensation is adopted to reduce the effect of the dead zone. Both the model simulation and the actual motor control effect verify the feasibility of the sensorless control strategy proposed in this paper.Based on the environment of the national energy-saving emission reduction, with the permanent magnet synchronous motor application scope is more and more widely,study of sensorless permanent magnet synchronous motor control and compensation is an important practical value and economic benefit. Finally, this paper analyzes the this kind of control method is of the advantages and disadvantages, pending later researchers correction, and puts forward a direction and vision for the future research work.