Design And Control Of High Salient Non-rare Earth PM Motor For Air Conditioner Compressor Application

As a climate adjustment device for human quality life,air conditioners have entered thousands of households and play an important role in human production and life.With the intensification of global warming and environmental pollution,high efficiency and energy saving have become an important issue in the human world.Therefore,whether it is household air conditioners,commercial air conditioners and car air conditioners,highly efficient and energy-saving air-conditioning systems have received widespread attention.Aiming at the motor system for the on-board air-conditioning compressor of electric vehicles,this paper studies a850 W,9-slot/8-poles high salient-rate non-rare-earth permanent magnet motor system.From the theoretical and practical aspects,the non-rare-earth permanent magnet motor is deeply studied.Design,optimization,mathematical model,control,etc.The main work of this paper is the following aspects.1)Analyze the research status of non-rare earth permanent magnet motors at home and abroad,reveal the research difficulties of non-rare earth permanent magnet motors and the research significance of this article.On this basis,the design characteristics of two V-type and spoke-type motors with rotor structure are studied,and the electromagnetic properties of the two motors are carried out by finite element method,including magnetic field distribution,flux linkage,back EMF,inductance,torque,efficiency,etc.Analysis and comparison are carried out to lay the foundation for the optimization and control of this type of motor.2)In view of the excellent performance of the spoke-type non-rare earth permanent magnet motor,the salient pole characteristics of the motor are analyzed,and the relationship between the salient pole rate and the permanent magnet parameters of the motor is revealed.Based on the multi-objective optimization method,the optimal design model of the motor is constructed.Taking the motor torque,torque ripple and salient poles as the optimization targets,according to the constraints,the optimal motor parameters are given,and the finite element analysis is carried out according to the design results,and the optimization algorithm is compared to verify the effectiveness of the optimization algorithm.3)Construct a non-rare earth permanent magnet motor control system,and analyze the structure of a typical permanent magnet motor drive control system.MTALB is used to establish the control system model of non-rare-earth permanent magnet motors,and a control strategy of feedforward control + MTPA + field weakening control is proposed to study the driving characteristics of this type of motor.On this basis,based on the TMS320F28335 control core,the controller of this type of motor is constructed,and the control program is written according to the control strategy,which provides the basis for the experimental research of this type of motor.4)According to the optimized design results,the experimental prototype is manufactured,the controller is made,and the experimental system platform is built.Conduct related static and dynamic experimental studies to verify the effectiveness and reliability of the system.