Design Method of Axial Ventilation Slots for Rotor Gears of AC Traction Motors

Abstract

The invention discloses a design method for the axial ventilation groove of the rotor tooth of an AC traction motor. The axial ventilation groove is opened at the rotor tooth of the AC traction motor, and the rotor end rings with different widths are obtained by mathematical fitting. The average temperature and the average temperature of the stator winding, and analyze the heat dissipation effect of the temperature, so as to obtain the optimal width of the axial ventilation slot. The advantage of this structure is that the ventilation slots are set on the rotor teeth with the highest temperature rise during the operation of the motor, which can greatly improve the ventilation and heat dissipation effect of the rotor teeth, and significantly reduce the temperature of the motor rotor, especially its teeth and end rings, thereby It can significantly reduce the occurrence of faults such as broken rotor bars caused by excessive temperature rise, and achieve the purpose of effectively improving the operating life and reliability of the motor.

Description

technical field [0001] The invention relates to the field of ventilation structure design of an AC traction motor, in particular to an axial ventilation groove of a rotor tooth portion of an AC traction motor. Background technique [0002] AC traction motors are widely used because of their simple structure, low cost, and easy maintenance. However, with the continuous improvement of the power density of the AC traction motor, the unit volume loss generated during its operation also continues to increase, which will cause the motor temperature to rise continuously. If the temperature rise of the motor is too high, it may cause faults such as breakage of the rotor bar of the motor and damage to the winding insulation. Therefore, it is of great significance to optimize the design of the ventilation structure of the AC traction motor to reduce its temperature rise. [0003] The rotor teeth and end ring of the AC traction motor are the highest parts of the temperature rise of th...

AI Technical Summary

Problems solved by technology

However, at present, the axial ventilation slots are generally opened between the rotor teeth and the rotor shaft, and there is still a certain distance from the rotor teeth, thus reducing its cooling effect; obviously, if the ventilation slots are opened closer to the rotor teeth, It is more conducive to its convective heat transfer, and thus more conducive to reducing the temperature rise of its rotor teeth.

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