Development Of Sensorless Control System For PMSM In Air-condition Compressor

In recent years the inverter air-conditioner has been a mainstream product in the market for its good performance and high efficiency. But in domestic market,most of variable frequency air-condition which apply the inductance motor prevent improvement of its performance because of the disadvantages such as bigger start-up current and lower power factor. This kind of motor can not satisfy air-condition market's need under the condition of energy crisis. Permanent magnet synchronous motor (PMSM) will become the best choice of inverter air-condition compressor motor for its higher running efficiency and no excitation current. This thesis, on the background of application of PMSM in the variable frequency Air-condition, applying the method based on SMO(Sliding Mode Observer), has researched and accomplished the vector control of drive and control system of the sinusoidal PMSM with no sensor.Firstly, the no sensor detecting method of the rotor position of PMSM is analyzed in detail. After that, an estimated method based on SMO is designed and completed, which has strong robustness, simple control algorithm and easy implementation of engineering application.Secondly, on the basis of analyzing the mathematical model and vector control principle of PMSM, the system model of the no sensor control of PMSM based on SMO is established. At the same time, the drive and control system of no sensor PMSM based on SMO is designed. The system design includes hardware circuit design and software program module design.Finally, the drive and control system of PMSM based on SMO is researched by simulation and experiment. Using the MATLAB/Simulink software, the simulation of the system is carried out, and the results of simulation verify the availability of the method of SMO. Then, the drive and control system is experimented on the experimental platform of no sensor PMSM system based on 16-bit MCU XC164CM of Infineon. The experimental results agree with the results of simulation well, and testify the system performance meeting the design requirements.