Transmission Mechanism And Optimization Design Of Double Stator Permanent Magnet Vernier Motor

As a permanent magnet motor that has ability to achieve "low speed and large torque",permanent magnet vernier motor has high torque density,good reliability,simple structure and process,and has advantages in volume and weight.Because of its good grid-connected compatibility and overload capacity,it has broad development prospects in the field of wind power and other new energy,and has become a research hotspot at home and abroad.With the emergence of new structures of permanent magnet vernier motors,the researches on new permanent magnet vernier motors are insufficient,which hinders the development of the motor from theory to practice.In this paper,the parameters analysis,mathematical model,loss and temperature rise of a double stator permanent magnet vernier motor are studied.The details are as follows:The working principle and parameter design principle of double stator permanent magnet vernier motor are expounded,and the electromagnetic performance of double stator permanent magnet vernier motor is analyzed.The parametric model of double stator permanent magnet vernier motor is established,the cogging torque and cogging torque weakening mechanism are clarified,and the cogging torque weakening method which could be used for double stator permanent magnet vernier motor is defined.The structure of double stator permanent magnet vernier motor is optimized and the torque stability of double stator permanent magnet vernier motor is improved effectively.A two-dimensional subdomain model of double stator permanent magnet vernier motor is established,the simplified assumptions and subdomain division are defined,the Laplace equation or Poisson equation is established for each subdomain magnetic field,the boundary conditions of the subdomain are given,and the general solution expression of each subdomain is determined.The mathematical model of the double stator permanent magnet vernier motor is obtained,and the accuracy of the subdomain method is verified.The loss of double stator permanent magnet vernier motor is calculated,and the influence factors and characteristics of the loss are analyzed.The efficiency and torque density of the motor are determined.It is clear that the double stator structure can effectively improve the efficiency of the motor.The assembly model of the motor is designed,the internal air velocity and flow path are calculated,the heat dissipation coefficient is determined,and the electromagnetic field temperature field two-way coupling simulation is carried out.The results show that the temperature rise of the motor is within a reasonable range.The prototype structure of double stator permanent magnet vernier motor is designed,the prototype assembly is carried out and the test bench is built.The back electromotive force and cogging torque of the double stator permanent magnet vernier motor prototype are tested,the experimental data and the finite element calculation results are compared and analyzed,and the accuracy of the simulation results is verified.