Design And Performance Calculation Of Variable Frequency Asynchronous Traction Motor For Metro

With the development of social economy, traffic congestion is becoming a serious problem for many cities. Therefore, urban rail transit has undergone rapid development due to its advantages in terms of higher speed, less pollution, high punctuality rate and large vehicle capacity. As the key component of driving system in subway train, the variable frequency asynchronous traction motors are of a broad market prospect. This thesis focuses on the investigation of the electromagnetic design and simulation calculation method of variable frequency asynchronous traction motor, which aims to facilitate the R&D level of traction motor competent for booming city track traffic technology.In this thesis, an 180kW variable frequency asynchronous traction motor is studied. According to the performance requirements, a new design method is proposed which reflects the relationship between motor size and power more accurately than the traditional ones. Based on the design principles, the number, shape and dimensions of the rotor slot are determined and optimizaed for reducing the harmonic loss. Then, the internal magnetic field harmonics of the motor is analyzed. The time and space harmonics of the motor driven by a converter are calculated, and their influences on the electromagnetic performance are comprehensively analyzed.Then, ANSYS Maxwell and Simplorer are used to obtain the optimized parameters of the motor. The accuracy of the finite element analysis is verified by comparing test results and simulation results. Finally, an electromagnetic calculation program for the inverter fed traction motor is designed by using Visual Studio 2010. By using accurate equivalent circuit model and a new method analyzing the magnetic leakage of slot, the calculation precision of the program is improved. At the same time, the interface function provided by AutoCAD, ANSYS Maxwell and Microsoft Office are used, so as to automatically generate the geometric drawing, the FEA scripts and the calculation sheets of the designed motor. The program provides convenience for the designers engaged in the variable frequency asynchronous traction motor, which is advantageous for the development of this series of motors.