Structural Optimization Design And Research Of Axial Flux High Speed Switched Reluctance Motor

Switched reluctance motor is also called double salient motor.It is widely used in various fields as a cost-effective motor with simple structure and adaptability to various harsh environments.Although there are many advantages,due to the pulsed power supply current and the saturation characteristics of the magnetic field of the reluctance motor,it is easy to cause serious problems such as excessive torque ripple,vibration and noise.In order to improve its shortcomings,it needs to be solved by optimizing the motor.Motor optimization can be divided into algorithm optimization and structural optimization.Through structural optimization,the shortcomings of SR motors can be fundamentally improved.At present,a large number of researches focus on the design of radially excited SR motors,while the design of axially excited SR motors has received little attention.In this thesis,the structure is optimized on the basis of Axial Flux High Speed Switched Reluctance Motor（AFHSSRM）,aiming to fundamentally improve the problem of excessive torque ripple to meet the needs of many fields.In this thesis,the structure optimization research of AFHSSRM is divided into the preliminary optimization of motor structure design and parameters,and the optimization and analysis of structure improvement,with the goal of reducing torque ripple and improving performance.The main research contents are as follows:First of all,this thesis summarizes the development and application status of classic,high-speed SR motors and axial excitation doubly salient motors at home and abroad,classifies traditional reluctance motors,and compares radial excitation SR motors and axial excitation SR motors.The significance of this chapter to study the axially excited doubly salient high-speed motor.The topological structure and working principle of AFHSSRM are analyzed in detail,the speed control system and operation mode of AFHSSRM are studied,and the mathematical model and basic equations are further deduced.Secondly,combined with the electromagnetic design principle of reluctance motor,this thesis designs a three-phase 6/4-pole AFHSSRM,gives the rated index of the motor and solves the whole design process in detail.The preliminary optimization of the structure is carried out through the RM module,and the size parameters are adjusted repeatedly to finally give the structure size that meets the design requirements.By analyzing the basic performance of the motor and the reasons for the excessive torque ripple of the AFHSSRM,a theoretical foundation is laid for the further optimization of the subsequent structure.Finally,in order to further optimize the motor structure,AFHSSRM adopts the rotor asymmetric sloping pole structure,adopts the analytical method to provide theoretical analysis for the research,and adopts the parametric scanning method to select the optimal rotor sloping pole angle.Through theoretical analysis and ANSYS EM finite element software simulation,the magnetic field,inductance,torque and loss efficiency characteristics of the motor before and after optimization are compared.,the torque ripple is greatly reduced,and the loss is reduced and the motor efficiency is improved.From the aspect of processing technology,a rotor asymmetric segmented sloping pole structure is proposed.The simulation results show that the rotor asymmetric segmented slanted pole also has the effect of reducing torque ripple,reducing loss and improving motor efficiency,but reducing torque ripple.The effect is not as obvious as the continuous slope of the rotor.