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.

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Nowadays, horizontal well technology is being applied to the development of oilfield production capacity more and more. The horizontal well tractor can effectively solve the problem that the instrument can not get to the target layer by gravity. However, in actual conditions, Brushless DC motor (BLDCM) there is a large torque ripple problem, resulting in motor running is not smooth, vibration and noise is too large, can not meet the demand. Therefore, propose horizontal well tractor PMSM sine wave drive technology. The paper discusses the mathematical model of permanent magnet synchronous motor, analyzes the working principle of space vector pulse width modulation (SVPWM) technology, and establishes a speed and current double closed-loop space vector control system of the permanent magnet synchronous motor by using PSIM simulation software. Simulation results verify the robustness of the control system, and the torque ripple of the motor is small, in line with the working conditions of horizontal well tractor.