Structure Optimization Design Of A Synchronous Machine Based On Temperature Field And Flow Field

The development of the motor industry has been more than one hundred years, it is not only the key equipment in the national economy, but also widely used in people’s daily life.. Motor in operation in the process of produce a variety of loss, the loss function to the corresponding motor parts the motor temperature rise, which will directly affect the motor output, efficiency and economic and technical indicators, also have a direct impact on the motor running reliability and long service life. Temperature field calculation is one of the main tasks for the design of large-scale synchronous machine. One of the important criteria of the motor condition monitoring and fault diagnosis is temperature rise.. It is very important to predict the temperature distribution of large motor accurately, especially for the numerical budget of the highest temperature point..This paper through numerical simulation analysis of a synchronous machine temperature distribution, a large synchronous machine temperature distribution and the distribution of flow field is simulated by finite volume method of ANSYS fluent, also of the synchronous machine for optimization design and improvement design, and analyzes the simulation results of the design.The results of the simulation of the original structure of the synchronous machine show that the rotor has a large air flow, but the radial ventilation path is very difficult to pass the stator to the periphery.. In the end part of the stator winding, due to the end of space and outer frame has not formed an effective pathway, wind speed in this cycle, can not effectively will hot air away. Temperature field simulation results show that the temperature of the rotor part is obviously higher than the stator part temperature, and the large temperature difference is not good for the effective use of stator winding insulation property..The optimized design of the motor core length shortens 18%, reduces the motor’s production cost, and makes the maximum temperature 2.8% lower, and reduces the temperature difference of stator rotor coil. The improved scheme is based on the optimized scheme, and the ventilation hole is added, and the maximum temperature is reduced by 5.5%, the temperature difference between the stator and rotor coil is reduced to 8K, and the flow rate is increased by 33.6%. And can meet the motor F grade insulation B grade assessment requirements.