Research On A New Transverse Flux Permanent Magnet Motor With External Rotor

The torque density of the transverse flux permanent magnet motor(TFPMM)is usually 2-5 times of the conventional motor because it can realize the decoupling of the electromagnetic field.The characteristics of high torque density and high power density make experts and scholars at home and abroad done a lot of research work on TFPMM,and achieved some research results.At the same time,they proposed a variety of new TFPMM topology.A new transverse flux permanent magnet motor with external rotor is studied in this paper.Firstly,the equivalent dynamic magnetic network model of TFPMM is built with the Simulink module of MATLAB,and the magnetic circuit is transformed into circuit by electromagnetic analogy.The method simplifies the three-dimensional magnetic field into two-dimensional magnetic field.Under the allowable precision conditions,the simulation time of the motor design is shortened effectively,and the trend of the electromagnetic characteristics with the size of the motor can be found quickly.According to the principle of getting maximum flux linkage,the particle swarm optimization(PSO)algorithm combined with response surface model(RSM)is used to optimize the structure size of the motor,and the optimal size of the motor is obtained finally.Cogging torque is a common falling of all permanent magnet motors.In order to weaken the cogging torque of ERTFPMM,the cogging torque waveform of the motor is analyzed by Fourier transform.On this basis,the cogging torque of the motor is effectively weakened by shifting the one side teeth of each phase rotor to a certain angle.On the basis of the above design,the four-phase TFPMM is simulated and analyzed by ANSYS finite element simulation software,and the electromagnetic characteristics of single-phase,two-phase and four-phase structures of the motor under different loads are studied.After the design of the motor is completed,the corresponding prototype is developed,and a motor experimental platform is built.On this platform,the experimental verification of no-load,load and short-circuit faults in the state of generator is completed.