Improvement of Heat Dissipation Structure of Low Speed Permanent-Magnet Motor

A 160kW and 60r/min low speed and high torque permanent-magnet synchronous motor is studied. According to fluid mechanics and heat transfer theories, a motor temperature field calculation model is established. The motor fluid field and temperature field are coupling solved by the finite volume method, and the steady-state temperature distribution of the motor is obtained. In addition, the cooling wind thorn is added on the end face of rotor core in order to solve the high temperature rise problem of permanent magnet. The influences of the geometric parameters of the cooling wind thorn on the fluid field and temperature field are analyzed by simulation, and the optimum size of the wind thorn is obtained for the best thermal performance. As the highest temperature rise is located at the end of the stator winding, the winding temperature rise is reduced by sealing the thermal conductive adhesive between the motor shell and the end of the winding. The influences of different sealing solutions and thermal-conductivity adhesives on motor heat transfer are also simulated.