Research on energy saving and thermal management of high-efficiency and high-voltage motor based on fluid network decoupling

In order to solve the serious heating problem of high-efficiency high-voltage motor due to high power density and large electromagnetic load, this study carried out a fluid network to investigate the global fluid-solid coupling to predict temperature and analyze motor energy efficiency. Taking a 6 kV, 4-pole, 2500 kW compact high-efficiency high-voltage motor as an example, according to cooling and ventilated structure and fluid flow characteristics in the motor, the fluid flow and heat transfer characteristics can be obtained by solving the global fluid network model which is set up to divide the whole fluid field into several local decoupling zones (sub-models) including external fan, cooler and internal ventilated path. The 3D fluid-solid coupling local models have been established respectively which are effectively coupled to the motor global fluid network by fluid pressure. The model is then used to find the optimized structure to enhance the cooling by changing the height of the wind deflector and adjust the number of wind deflectors and the temperature is lower than when it was not optimized. The maximum temperature of the stator and rotor of the internal ventilated path and the outlet temperature of the internal ventilated path are reduced, which the motor power level can be further improved and the purpose of energy saving can be achieved. (C) 2021 The Authors. Published by Elsevier Ltd.