The 3D Steady Temperature Field Analysis And Structure Optimization Of The Driving Motor For Helium Circulator

As the high temperature air cooled reactor of nuclear power station essential equipment, the main helium fan is installed at the output end of the steam generator in a loop, which is the only power equipment in a loop system of nuclear reactor, it drives the helium gas through the helium circulation in the reactor system and in loop-loop to remove the heat generated in the reactor cores. Finally to achieve the goal of energy exchange. Because the main helium fan is a vertical large-scale frequency conversion electrical machinery,this motor does not dispose the spare electrical machinery, the request has the long service life and the very high security reliability. Therefore it is necessary to conduct a deep study of the 3D steady temperature field of the driving motor for helium circulator,the data can improve the safety performance of the main helium fan, prolong the service life and ensure hightemperature gas cooled reactor safety.The developing background and study state at home and abroad were introduced in this dissertation, the basic theory of related for the cooling structure of motor was described detailed. Theoretical basis was provided for the calculation of motor physical fields.This dissertation compared different types of motor ventilation system and its characteristics, the fluid characteristics of cooling medium in cooling structure was analysed. The 3D model was established according to the motor size data, considered the influence of fluid field of the windage loss, Based on the physical characteristics of helium, The ventilation loss of the motor was calculated according to the structure of the stator and rotor of the motor. The distribution of fluid in the ventilation system was obtained. Besides, the fluid field of different cooling medium were compared, The conclusion proved the physical properties of fluid have an effect on the distribution.Based on the fluid mechanics and thermodynamics principle, numerical calculation of the motor temperature field was carried out with the fluid solid coupling method. Stator-rotor coupled thermal field numerical calculation of the driving motor for helium circulator was obtained. In order to further study the ventilation structure of the motor, the heat dissipation capability of the motor was optimized, The optimization scheme of 2 types of ventilation structure was proposed, and the effect of the geometrical dimension of the ventilation channel on the cooling performance of the motor was obtained.In the end the dissertation compared Different plan, It is concluded that the optimal solution.The research results for motor temperature rise calculation and optimization of ventilation system can improve the safety performance and prolong the service life of motor.