Design and Analysis of the High Torque Density Circumferentially Excited Permanent Magnet Motor Based on PSO

In order to further improve the torque density of the permanent magnet motor, a novel 650 kW circumferentially excited permanent magnet (CEPM) motor is proposed and designed. The response surface method and particle swarm optimization (PSO) algorithm are used to obtain the optimal design of the circumferentially excited permanent magnet motor. The electromagnetic performance is analyzed under the different operating conditions. The mathematical model of three-dimensional end transient electromagnetic filed is calculated to obtain the end leakage magnetic flux and end component losses, which provides the heat source for thermal analysis. Novel air-water cooling dual self-circulation ventilation system with the axial-flow fan is proposed. The complex fluid flow and the temperature distribution of each component are determined in the circumferentially excited permanent magnet motor based on three-dimensional fluid-solid thermal coupled model. The highest temperature of the components is determined. This novel ventilation cooling system can effectively take away the heat in the circumferentially excited permanent magnet motor. A prototype of circumferentially excited permanent magnet motor is manufactured. The designs and analyses are validated.