Research On The STM32 Based Sensorless Air-Conditioner Compressor Vector Control System

In recent years, with the development of economics, energy issues and environmental issues are becoming increasingly serious, the country more and more attention to energy saving. Many scholars and researchers of home and oversea have attached importance to PMSM because of its small volume, high power density, high efficiency and power factor, More and more air conditioning manufacturers to the permanent magnet synchronous motor applied in variable frequency air conditioner compressor. Variable frequency drive compressor is the mainstream of development direction of home air-conditioning energy-saving technologies, with the automotive comfort requirements, the improvement of automotive air conditioning systems is becoming a major concern of the major car manufacturers. In the new energy vehicles and engineering vehicles in the urgent need for electrically driven air conditioning system. Automotive electric air conditioning compressor drive system generally consists of three parts (ie motors, drives and compressors).In order to adapt to the development of electric vehicles requirements, at the same time the solution of automobile air conditioning system existing problem of low efficiency in driving, This study is a air-conditioning drive system for electric car.Traditional permanent magnet synchronous motor drive control system, generally requires the rotor position and velocity information as a feedback signal, the rotor position, the speed of acquisition almost all of the optical encoder, resolver and other precision mechanical device to obtain. Air conditioning compressor due to the strong corrosion of the refrigerant, the conventional position sensor is difficult to work properly, so the study of a reliable, low-cost sensorless control method has become the permanent magnet motor controller hot spots.The main content of this paper include: Depth analysis of the surface-mount permanent magnet synchronous motor (SPMSM, non-saliency) and embedded (IPM, saliency) in a different coordinate system,permanent magnet synchronous motor mathematical model and conversion method. Permanent magnet synchronous motor vector control theory and voltage space vector modulation technique and a single resistor link current sampling methods.The theory of sliding mode observer and Luenberger observer is analyzed in detail.Using theαβreference frame, real-time online estimations of SPMSM rotor position and speed. Meanwhile, taking into account the more complex model of the IPM motor in theαβcoordinates, to simplify the application, we take an average of direct axis inductance method to obtain the inductance of theαβcoordinate system model, the use of rotor position estimation method based on the combination of the luenberger observer and the phase-locked loop, while meeting the rotor position and speed detection (SPMSM and IPM motor). Finally, the MATLAB/Simulink platform based on sliding mode observer and the luenberger observer for PMSM rotor position estimation algorithm simulation, to verify the feasibility of the proposed two control methods.On the basis of simulation experiments, the introduction of low cost, high performance based on arm-cortex-m3 core of STM32 microprocessor as control core, Design a control circuit and external auxiliary circuits, write software. The results show that the drive system to meet the automotive air conditioning operating requirements.