Design Of Multi-phase Slotless High-speed Permanent Magnet Motor

To keep pace with the development of electric propulsion,high-speed permanent magnet motors must maintain high speed and high efficiency while improving power density and reliability.According to the application requirements of electric propulsion occasions,this paper proposes a multi-phase slotless high-speed Halbach permanent magnet motor design,and studies its electromagnetic design and optimization.The specific works are as follows.1.This paper studies the multi-phase structure,and analyzes the performance of different slot-pole structure to improve the reliability of the motor.To raise power density,reduce losses,and improve operational reliability,the structure and the material of the stator and the rotor are discussed,then a specific design of the motor is determined.2.Based on an analytical method,this paper proposes a modified sub-domain algorithm for Halbach magnetized structure slotless motor to calculate and optimize the electromagnetic performance of the motor.The slotless vector magnetic potential expression,the continuity boundary equation,and the residual Halbach magnetic components in different magnetization directions are derived in detail,which increases the accuracy and efficiency of the algorithm.By comparing the electromagnetic results of the analytical algorithm with that of the finite element algorithm,the effectiveness of the new algorithm is verified.Its electromagnetic performance calculation results also contribute to proving the accuracy of several loss models in this paper.3.This paper proposes an improved particle swarm optimization algorithm for motor optimization.By combining the Taguchi algorithm with particle swarm algorithm,the randomness in initializing the swarm,which is proportional to the possibility of falling into a local optimal solution due to random assignment,is reduced.Exploiting the combination of Taguchi-particle swarm algorithm and the analytical algorithm on the optimization of the motor parameter,the optimal result will be obtained with high calculation speed,convergence speed,and low probability of falling into the local optimal solution.4.A prototype is made and a platform for experiments is built.The writer conducts the winding test experiment,the no-load experiment,the static torque experiment,and the load experiment to verify the electromagnetic performance of the motor.