Permanent magnet synchronous motor (PMSM) has the advantages of small size, light weight, simple structure, reliable operation, high power factor, easy heat dissipation and easy maintenance. It has become the best choice for electric vehicle air conditioner compressors, but in actual working conditions, the air conditioner compressor has the problem of excessive noise and serious system turbulence, which makes the air conditioner compressor unable to work normally, which has serious consequences. The method of using the field oriented control can overcome the problems existing under actual working conditions, so it proposed the design of permanent magnet synchronous motor control system for electric vehicle air conditioner compressor.

The actual working environment temperature of the horizontal well tractor is too high, which leads to position sensor of general brushless DC motor (BLDCM) cannot work normally. Therefore, the position sensorless drive system is designed to overcome the problems caused by the position sensor in the actual working conditions. The principle of sensorless BLDCM work is introduced in detail, And drive system of Sensorless BLDCM was established by using simulation software. The use of three stage start make motor smoothly start, the motor speed detection based on model reference adaptive control (MRAC), ensures accurate commutation. Finally, the hardware and software design of the BLDCM system based on digital signal controller (DSC) is introduced and tested. The experimental results show that the drive system can start the BLDCM smoothly in the high temperature environment, and can quickly track the given speed, which meet the actual work demand of the horizontal well tractor.

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