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Anti-broken-bar motor rotor

A motor rotor and anti-break technology, which is applied in asynchronous induction motors, electrical components, electromechanical devices, etc., can solve problems such as temperature rise of guide bars and short-circuit rings, broken bars, and distortion of guide bars, so as to reduce welding construction Difficulty, eliminate broken bar failure, improve the effect of welding strength

Active Publication Date: 2019-10-11
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment

[0023] The anti-break bar motor rotor of the present embodiment, as figure 1 and figure 2 , comprising: comprising: a silicon steel sheet iron core 1, a rotor shaft 2 passing through the center hole of the silicon steel sheet iron core 1, a pressing plate 3 pressed on both ends of the silicon steel sheet iron core 1 and a short-circuit ring 4 positioned outside the pressing plate 3. Since the two ends of the silicon steel sheet iron core 1 have the same structure, only one end is used for illustration in the figure.

[0024] The silicon steel sheet iron core 1 has a semi-open core slot, and guide bars 5 are embedded in the iron core slot. There are 12 axial ventilation holes 6 in the silicon steel sheet iron core 1, and the pressure plate 3 has one-to-one correspondence with the ventilation holes 6. Hole 7. In this way, heat dissipation channels can be effectively increased to improve heat dissipation.

[0025] The pressure plate 3 is fixedly connected with three stoppers ...

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Abstract

The invention relates to an anti-broken-bar motor rotor, and the rotor comprises a silicon steel sheet iron core, a rotor shaft passing through a center hole of the silicon steel sheet iron core, pressing plates which press the two ends of the silicon steel sheet iron core, and short circuit rings located at the outer sides of the pressing plates. According to the anti-broken-bar motor rotor provided by the invention, all causes of broken bars can be systematically solved, and the occurrence of broken bar faults is completely eradicated.

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...

Claims

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Application Information

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IPC IPC(8): H02K17/16H02K1/32
CPCH02K1/32H02K17/16
Inventor 王维冷祥洪
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE