Study On Iron Losses And Ventilation Structure Of Helium Fan Drive Motor For High Temperature Gas Cooled Reactor

As a heat transfer working fluid cycle driving equipment in the first circuit of high temperature gas cooled reactor,helium drive motor of high temperature gas cooled reactor requires high reliability and long service life,so it is very important to calculate the loss and temperature field distribution accurately.The high power,variable frequency drive,high speed,fan load,high temperature and high pressure helium as heat transfer working fluid,these characteristics determine that the motor has no mature theory and technical experience to learn from,lack of targeted research on the fluid characteristics and heat transfer characteristics of high pressure helium gas itself,which is not conducive to the design and optimization of the ventilation structure of the drive motor.Therefore,the research on the convection heat transfer coefficient of high temperature and high pressure helium gas and the optimization of ventilation structure of helium drive motor in high temperature gas cooled reactor is of great significance to improve the service life of drive motor and ensure the stable and safe operation of nuclear reactor.This dissertation summarized and analyzed the research status of high temperature gas cooled reactor,helium resistance coefficient and helium convection heat transfer coefficient at home and abroad,and expounded the basic theory of numerical calculation of iron loss,fluid field and temperature field,and established the theoretical basis for the analysis of iron loss of driving motor and the optimization calculation of ventilation structure.The magnetic density distribution of stator and rotor core and the loss distribution of the stator and rotor core were calculated under different operating conditions.The magnetic density distribution was analyzed,and the error between the analytical calculation and the numerical calculation of the core loss was compared by using the simulated magnetic density data.In order to study the design law of motor ventilation structure with helium as cooling medium,the resistance coefficient of helium in circular straight pipe with different pressure,different inlet velocity and different heat flow rate was analyzed,and compared with air under the same conditions.This dissertation revealed the difference between the design of fan-driven motor ventilation structure in helium environment and the air cooling medium,and gave suggestions for the design of drive motor ventilation structure in helium environment.According to the size data of the drive motor,a stator radial ventilation structure was established,and the fluid field distribution and cooling performance in different height ventilation structures under high temperature and high pressure helium gas environment were analyzed.The results of this dissertation filled the blank in the study of resistance coefficient of motor ventilation structure based on high temperature and high pressure helium cooling medium,and provided the design basis for motor ventilation structure under high pressure helium environment.