The Design,Optimization And Analysis Of Synchronous Reluctance Motor

In recent years,synchronous reluctance motor(SRM)has attracted many researchers’interest due to their simple structure,low production cost,and good mechanical performance.The electromagnetic design of SRM has a direct impact on their electromagnetic performance,and reasonable electromagnetic design can improve the performance and reliability of the motor.The rotor structure of SRM is closely related to the motor performance.Optimizing the rotor structure is of great significance to improve the motor performance.The rotor of SRM has multiple layers of magnetic barriers and complex internal magnetic circuits.Choosing a suitable analysis method can improve work efficiency when analyzing and calculating its performance.In response to the above issues,this paper will study the design,optimization,and analysis of SRM.At first,the basic principles of SRM are introduced.Introduced the structure,working principle,voltage equation,phasor diagram,and electromagnetic power equation of SRM.SRM has the characteristic of good speed regulation performance,and its main control strategies are introduced and analyzed.Finally,for the performance calculation of SRM based on FEM,methods for calculating the performance of synchronous reluctance motors under current source and voltage source excitation are provided.This paper presents an electromagnetic design of an 18.5kW,1500r/min SRM based on performance requirements.Through the power equation of the SRM,the relationship between the main dimensions of the motor and the motor power and rated speed is obtained.According to the derived formula,determine the basic size of SRM.The influence of armature winding,air-gap size and core length on motor performance is analyzed.Based on FEM calculation results,analyze the electromagnetic performance of the motor and select a suitable design scheme.After completing the design work,the electromagnetic performance of SRM is obtained by FEM.This article also optimized the rotor of SRM.First,FEM is used to calculate the influence of the number of magnetic barriers,the occupancy of the magnetic barrier,the shape of the magnetic barrier and the auxiliary slot of the q-axis on the saliency rate.Based on the average torque,torque ripple,power factor and other performance indicators of the motor,the influence of the rotor structure on the motor performance is studied,and appropriate rotor structure parameters are selected for subsequent rotor optimization.Study the effect of changing the width of the magnetic bridge in the rotor of SRM on the saliency rate and magnetic bridge force,and combine the analysis results of the previous text to select a C-shaped magnetic barrier rotor as the basis for optimization work.The rotor structure scheme is designed by changing the width of the rotor magnetic bridge.Calculate and analyze the force acting on the rotor magnetic bridge and the electromagnetic performance of the motor in the design scheme.Finally,with the torque ripple,power factor and the force on the rotor magnetic bridge of the motor as variables,the objective optimization function is established to optimize the rotor structure scheme,and the electromagnetic performance of the optimized SRM is calculated.This paper presents an equivalent reluctance network model(ERNM)for SRM and calculates the motor performance based on this model.Firstly,a method for establishing an ERNM based on the motor structure was proposed,and the d-axis,q-axis,and load models were solved to obtain the air-gap flux density,power factor,and winding induced voltage of the motor.Secondly,calculation process and method for calculating motor performance based on ERNM was introduced.Finally,based on the load ERNM,the motor losses,reaction reactance and magnetic density waveform coefficients of the quadrature and direct axis armature,as well as the output torque and efficiency under different output powers are calculated,and compared with the results of FEM;Conducting prototype tests to compare the motor output performance of ERNM,FEM,and prototype tests can verify the effectiveness of ERNM in calculating motor performance.