Optimization Of Speed Regulation Response Of Ultra-high Speed Permanent Magnet Synchronous Motor For Fuel Cell Electric Air Compressor

Fuel cell vehicle has the advantages of zero emission and no pollution,which is an important direction of the development of new energy vehicles.As an important part of the fuel cell vehicle gas supply system,the role of the electric air compressor is to pressurize the air and transport it to the fuel cell stack,which generates electricity by electrochemical reaction with hydrogen and provides energy for the fuel cell vehicle.In order to meet the needs of fuel cell vehicles with multiple working conditions and wide power range,fuel cell stacks are gradually developing in the direction of high power,which requires improving the air supply flow rate and pressure ratio of fuel cell electric air compressor.Fuel cell electric air compressor is composed of compressor and permanent magnet synchronous motor.At present,there is no significant breakthrough in compressor structure design,the speed of permanent magnet synchronous motor used in fuel cell electric air compressor must develop to the direction of high speed and ultrahigh speed,which brings new challenges to the speed response ability of ultra-high speed permanent magnet synchronous motor.In order to improve the speed regulation response ability of ultra-high speed permanent magnet synchronous motor,this study started from the construction of the mathematical model of speed regulation response of ultra-high speed permanent magnet synchronous motor,and carried out research work on the ontology design and vector control of ultra-high speed permanent magnet synchronous motor.The main research contents are as follows:(1)The mathematical model and design objectives of ultra-high speed permanent magnet synchronous motor based on speed regulation response ability are studied,the electromagnetic design method suitable for ultra-high speed permanent magnet synchronous motor is explored,and the electromagnetic design scheme of ultra-high speed permanent magnet synchronous motor is given.Electromagnetic simulation results show that the maximum magnetic density of ultra-high speed permanent magnet synchronous motor is 1.34 T,which meets the requirements of electromagnetic design.Under the rated condition,the electromagnetic power and mechanical power are 29.01 k W and 28.66 k W,and the electromagnetic torque is 3.42 N·m,which meets the design objectives of ultra-high speed permanent magnet synchronous motor.(2)Stator parameters of the motor were selected as optimization variables,and taguchi method was applied to the electromagnetic finite element simulation of ultra-high speed permanent magnet synchronous motor,and the influence of optimization variables on the torque characteristics of the motor was summarized and the optimization scheme was given.Simulation results of ultra-high speed permanent magnet synchronous motor before and after optimization show that the average electromagnetic torque corresponding to the peak current of the optimized motor increases by 6.59%,and the groove torque decreases by 30.51%,which verifies the effectiveness of the optimization scheme of ultrahigh speed permanent magnet synchronous motor.(3)Based on the voltage mathematical model of ultra-high speed permanent magnet synchronous motor considering the transient changes of current,a transient current injection(TCI)control method considering the transient effects of current was designed.Compared with the current harmonic injection(CHI)control method,the simulation results show that the speed response time of ultra-high speed permanent magnet synchronous motor using TCI control method is shortened from 2.060 s to 1.465 s,which verifies the effectiveness of TCI control method.(4)An experimental bench for speed control response control of ultra-high speed permanent magnet synchronous motor was built considering the transient action of current.The experimental scheme of speed control response control experiment under two different control methods was formulated and the bench experiment was carried out.The experimental results show that: In the three groups of experiments with target speed of 110000 r/min,125000 r/min and 140000 r/min,the speed response time of TCI control speed regulation response experiment was shortened by 0.086 s,0.106 s and 0.196 s,respectively,compared with that of CHI control speed regulation response experiment,which verified the effectiveness of TCI control method.