Main pole iron core screw repairing method of traction motor

Abstract

The invention relates to an overhaul method of a traction electric motor in the overhaul industry of rail vehicles, in particular to a repairing method of a screw hole of a main pole core of the traction electric motor, the step thereof is as follows: a broken screw hole on a tension rod of an iron core is expanded and the pore diameter is appropriately processed by taking the thickness of a silicon sheet as a standard; firstly, a 3mm steel washer is arranged at the bottom of the screw hole, and then 70-80A welding current is applied to welding; the part of the screw hole which is welded in a resurfacing way is ground; lineation and drilling are carried out according to drawing paper, and the steel washer additionally arranged at the bottom is removed together; tapping is carried out: after drilling is finished and the tapping is carried out, thus achieving the size requirements stated by the drawing paper; a thermodetector is used for verifying that the heat productivity of the iron core and the other parts of the motor is consistent and not abnormal. The overhaul method can reduce the repairing cost, and the success ratio of the repairing can reach 100 percent; the operation is simple and the repair capability in each month can reach 50, the overhaul efficiency is high; the iron core after being repaired can meet the requirements that the vehicles run at high speed and the traction electric motor is used in a poor condition after overload, without affecting the service life of the motor.

Description

Technical field: [0001] The invention relates to a maintenance method for a traction motor in the railway locomotive maintenance industry, in particular to a method for repairing a screw hole of a main pole iron core damaged during the disassembly process when the stator of the traction motor is disassembled. Background technique: [0002] The traction motor is the power source for locomotive operation, and each locomotive is equipped with six DC traction motors. The main pole iron core is the main part of the magnetic circuit of the traction motor. It is made of laminated silicon steel sheets, and a tie rod with a screw hole is pierced in the middle for fast connection with the machine base. After the stator is assembled, vacuum pressure impregnation is carried out as a whole, and the bolts of each magnetic pole are very tight. In addition, the means of disassembly are not complete, which is easy to cause damage to the threads of the screw holes of the magnetic pole core. ...

AI Technical Summary

Problems solved by technology

The cost of the first method is relatively high, each main pole iron core is about 1200 yuan, there are 24 locomotives, and the trolley replacement rate is about 8%. According to the current annual maintenance of 80 locomotives of this type of motor, the investment cost is about 180,000 yuan; the second method is extremely inefficient in repairing. It is necessary to drill out 12 rivets on both sides of the baffle, and then press out the tie rods. After updating, press in and baffle riveting. Each person can only repair 2- -3