水轮发电机转子系统磁悬浮承重装置散热优化模型设计

Since the excitation coils of electromagnetic levitation bearing system for the axial load of hydraulic turbine generator are almost sealed inside of the system, the heat inside is difficult to be dissipated, and then over high temperature rise would occur there. For solving this problem, it is put forward a new model that comes from the old model devided into four parts same as each other, which called a quarter model, in order to make more space for the air flow in. So as to create a convection heat dissipation on the surface of coils. So far as the design of the model is concerned, suitable numerical models are selected for this model a long with the deduction of the coefficient of convection heat dissipation, and then the simulation analysis on the temperature and the magnetic field is made with the software Ansys. The results show that under the premise to satisfy the bearing requirement of hydraulic turbine generator unit, the temperature of the coils can be greatly lowered with the reasonably designed model, therefore, the application requirement of the system can be met as well.