Research On Non-rare-earth Permanent Magnetic Concentrated Low-cost Single-phase Switched Reluctance Motor

The single-phase switched reluctance motor is a new type of brushless motor.The fixed rotor adopts a double-salient pole structure,the winding uses a concentrated winding,and permanent magnet is provided on the stator.The structure is simple and the operation reliability is high.The characteristics of the motor itself determine its low manufacturing cost,ruggedness,and convenient control.It is very suitable for high-speed operation,so it is widely used in fan and pump load driving occasions.The cost of the motor body is lower than that of single-phase motors and permanent magnet motors of the same power.Single-phase switched reluctance motors need to be used together with the controller.In the case of speed regulation,the cost of the entire system is still lower than other motor systems,such as permanent magnet synchronous motor systems.The low cost is the competitive advantage of the entire single-phase switched reluctance motor speed control system.The single-phase switched reluctance motor with permanent magnets on the stator combines the performance advantages of permanent magnet motors and traditional switched reluctance motors,which can not only achieve high-speed operation,but also significantly reduce the winding copper consumption during motor operation and improve motor operation.Efficiency increases the power/torque density of the motor.This paper mainly did the following work:(1)Introduced the newly proposed new type of concentrated magnetic high power density single-phase high-speed switched reluctance motor system and its hybrid excitation scheme.The topological structure,working principle and operating characteristics of the motors of these two schemes are compared,and the static field finite element analysis method is used to analyze the inductance model and magnetic density distribution of the motor.(2)According to the electromagnetic performance target of the motor,the relevant formula of the motor design is used to establish and solve the dimensional parameter equation of the new magnetic flux type high power density single-phase high-speed switched reluctance motor,and combined with the magnetic circuit analysis The dimensions of the magnet and the magnetic circuit are calculated and optimized,and the determination method and optimization scheme of the key parameters of the motor are given.(3)The static field finite element method is used to analyze the air gap magnetic field distribution of the motor and the static torque changes with rotor position and winding current;the time step finite element method is used to analyze the motor performance and Compared with the performance of the traditional motor under the same operating conditions,it shows the advantages of the motor structure proposed in this paper.The performance of the pure permanent magnet excitation structure of the new type of high power density single-phase high-speed switched reluctance motor and its hybrid excitation scheme were compared,and the performance advantages of its hybrid excitation scheme in wide speed range adjustment were verified.And through the analysis method combining experiment and simulation,the performance of the motor is verified.(4)Stator modal and vibration and deformation analysis of the new type of concentrated magnetic high power density single-phase high-speed switched reluctance motor.In this paper,the three-dimensional modeling software SolidWorks and the finite element simulation software Workbench are used to study the various modes and frequencies of the stator modal under the two schemes with the help of the modal analysis method combining experiment and simulation.Change with deformation under no-load and rated conditions.