Design Of Semi-direct Drive Axial Flux Switched Reluctance Motor For Beam Pumping Unit

As the main equipment for oil companies to obtain crude oil,the beam pumping unit has the disadvantages of long transmission chain and low power factor,resulting in huge resource waste.At present,the rare earth permanent magnet motor is mainly used to directly drive the gearbox to save the transmission link.However,rare earth permanent magnet materials cost too much and are often in short supply.The axial flux switched reluctance motor has the advantages of low cost and can work in harsh environment,and can be used to drive the beam pumping unit.Therefore,it is particularly necessary to optimize the design of this type of motor.In this thesis,according to the requirements of motor installation and working environment,an axial flux switched reluctance motor with flat structure is designed.The main research contents are as follows:Firstly,by studying the existing design theory of radial flux switched reluctance motor,the main structural parameters of axial flux switched reluctance motor are determined by analogy.The influence of the air gap length,stator pole arc coefficient,rotor pole arc coefficient and rotor thickness of axial flux switched reluctance motor on the output torque and torque fluctuation is studied.The influence of stator yoke thickness on the average torque of motor is studied.The variation law of motor output torque and iron loss under different stator inner and outer diameter ratios was studied.Secondly,the advantages and disadvantages of non-oriented silicon steel materials,oriented silicon steel materials and soft magnetic composite materials are studied.The magnetization curves of three different electrical materials are compared.The influence of non-oriented silicon steel materials,oriented silicon steel materials and soft magnetic composite materials on the output torque and torque fluctuation of the motor is studied.The influence of three different rotor materials on the air gap magnetic density of the motor and the magnetic density distribution are analyzed.Then,the influence of the thickness and width of the rotor boss on the output torque and torque fluctuation is studied.The output torque,current waveform,copper loss,iron loss and magnetic density distribution of the motor under the boss rotor structure and the non-protrusion rotor structure are compared and analyzed.Finally,The motor model parameters and heat source are solved.The model of the axial flux switched reluctance motor is simplified by Solidworks.The heat dissipation capacity of motor under rated working condition is simulated and analyzed by Fluent simulation software.The internal temperature distribution of the axial flux switched reluctance motor was explored and the thermal stability of the motor is verified.