Design And Analysis Of High Efficiency Permanent Magnet Frequency Converter Motor For Air Compressor

Compressors are representative of a typical type of wind turbine and are used in many different applications.From household air conditioners and refrigerators to transportation,industrial production,medical research and development,etc.,there is no need to use compressors.In a very important role.The PMSM has the advantages of high efficiency and low energy consumption,and a large part of the traditional compressor still uses the asynchronous motor as the driving device,resulting in serious energy waste.This topic is designed for the design of three-phase permanent magnet synchronous motor for screw air compressors on the market.First understand the working structure of the compressor and the working environment of the permanent magnet synchronous motor,and determine the relevant technical indicators of the permanent magnet motor according to the work requirements.According to the determined technical indicators,combined with the design requirements to determine the relevant size parameters of the permanent magnet synchronous motor,such as: motor three-circle size,armature length,air gap thickness,pole slot ratio.The electromagnetic calculation of the motor is programmed by MATLAB to complete the accurate motor magnetic circuit calculation and parameter optimization.Determine the final motor design.Then,because the magnetic circuit method can not reflect the difference of different rotor structures in the calculation of the motor,it is necessary to carry out finite element analysis on the rotor structure of the motor.By designing different rotor structures,the model of the motor is established and selected.The V shape is used as the rotor structure of the permanent magnet motor.At the same time,for the angle problem of the V-shaped motor,the control variable method is used to change the angle of the permanent magnet of the motor to compare the performance parameters of the permanent magnet motor under different angles,and analyze the influence of the angle on the V-shaped motor.Since the working environment of the permanent magnet motor is in a closed space,the temperature rise control requirement of the motor is strict.The motor is modeled and analyzed by using Motor-cad,and the magneto-thermal coupling method is adopted.The temperature rise of the motor is analyzed to ensure that the temperature rise is not high during the operation of the motor.Then,because the permanent magnet motor is more noisy than the ordinary motor,and in order to avoid the rated speed of the motor approaching the critical speed,the modal analysis and strength check of the motor are required to ensure smooth running of the motor.Finally,after adjusting the parameters and materials of the motor,the motor prototype is designed.The experimental test is carried out on the motor prototype.Firstly,the temperature rise test is carried out on the motor.The load test of the motor is carried out later,the motor running condition of the motor at different load rates is tested,and then the motor is subjected to no-load test.Test the performance parameters such as the motor back EMF,and finally,test for different emergency conditions to ensure that the motor can run stably in a short time under the condition of overload and overcurrent.