Comprehensive Calculation Of Fluid Field And Temperature Field Of YKK Mediumsized High-voltage Asynchronous Motors

With further increase of extent industrialization, people have a greater demand for the single capacity of the motor. They are used in industrial production and transportation with the people’s lives in various industries. Safe and stable operation of the motor is essential, so that the motor temperature rise limit is an important factor to investigate whether a safe and stable operation of the motor.YKK series motor is with air-air cooling a high power density motor, the internal structure of the ventilation shaft, radial mixing ventilation ditch. This type of motor with a fan on rotor, its role is to make the cooling gas within the internal wind path of the motor can be recycled and heat exchange in the cooler.Motor shaft is mounted centrifugal fan, whose role is to the external cold air into the motor cooling duct, so that the high-temperature gas of internal wind path with the low-temperature gas through the cooling tubes for heat exchange.In this study, using a YKK450-4,500 k W medium size high voltage asynchronous motor as test prototype for numerical simulation. According to the actual size of the prototype, we establish the physical model for the cooler, the end winding, the internal wind path and internal fan. Combined with the actual situation of this study the assumptions and the appropriate boundary conditions are given to link each region. We apply the theory of Computational Fluid Dynamics(CFD) and Numerical Heat Transfer(NHT), to study the prototype.Test show the physical model of establishes and the solution methods are feasibility in this study. From the simulation results of the cooler area, we found that the cooling performance of the prototype cooler does not reach the ideal working conditions. Therefore, improve the structure of cooler and numericalanalysis it again. We found that the cooling performance is improved prototype cooler. The prototype of internal wind path was numerical analyzed, and found that the hottest point. Try changing the prototype ventilation ditch width to found the impact on the prototype the temperature rise, the numerical results show that when the number of prototype for the ventilation ditch is nine, the lowest temperature of the prototype.In this study, we applied the numerical simulation method to analyze temperature distribution and find the hottest point of the prototype. By optimizing the design of each part to decreases hottest point temperature of prototype, thus embedded in the hot spot temperature sensor to monitor the motor to ensure the safe and stable operation.