An anti-broken bar motor rotor

Abstract

The invention relates to an anti-breakage bar motor rotor, comprising: a silicon steel sheet iron core, a rotor shaft passing through a central hole of the silicon steel sheet iron core, pressing plates pressed on both ends of the silicon steel sheet iron core, and a short circuit ring. The anti-broken bar motor rotor provided by the invention can systematically solve all the causes of broken bars and prevent the occurrence of broken bars.

Description

technical field [0001] The invention relates to an anti-breakage bar motor rotor, which belongs to the technical field of asynchronous motors. Background technique [0002] The fracture of the copper guide bars of the squirrel cage rotor of high-voltage large and medium-sized asynchronous motors is a recognized problem in the motor manufacturing industry at home and abroad. From the analysis of the mechanism of fracture, there are the following reasons for the unreasonable structure and process: [0003] 1. The guide bar is loose in the rotor core slot. During the starting process of the motor, its reactance is mainly manifested as the leakage reactance of the stator and rotor. The electromagnetic force generated by the leakage reactance points to the bottom of the slot and pulses at twice the frequency of the bar current. If the guide bar is in a suspended state in the groove, the guide bar will vibrate under the action of pulsating stress, and a 2 times the current fre...

AI Technical Summary

Problems solved by technology

[0004] 2. The guide bar protrudes from the iron core too long

Some motor end rings are more than 70mm away from the iron core (in order to facilitate the "T"-shaped right-angle welding of the guide bar and the short-circuit ring), under the action of torsional vibration torque, the guide bar will be distorted and deformed at the extension end of the iron core. cause broken bars

[0005] 3. The short-circuit ring hangs outside the rotor core and is only supported by guide bars

[0006] 4. There are welding quality defects between the guide bar and the short-circuit ring. Under various stresses, the weld cracks, resulting in broken bars

[0007] 5. Poor heat dissipation of the rotor causes the temperature of the guide bars and short-circuit rings to rise, and the mechanical strength to decrease, resulting in broken bars

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