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Induction motor with collar-reinforced end ring

A technology for induction motors and end rings, which is applied to asynchronous induction motors, electric components, electromechanical devices, etc., and can solve problems such as cracks, end ring expansion, and end ring contact

Pending Publication Date: 2022-07-29
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deformation can cause the end ring to expand, potentially leading to cracks
In severe cases, expansion may cause the end rings to contact the inner wall of the stator

Method used

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  • Induction motor with collar-reinforced end ring
  • Induction motor with collar-reinforced end ring
  • Induction motor with collar-reinforced end ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0083] Embodiments of the present disclosure provide a design, a method of operation, and a method for manufacturing an induction motor utilizing a thin-walled collar surrounding the outer diameter of the rotor end ring. The collar on the outer diameter is subjected to high centrifugal forces and stresses at high rotational speeds (eg > 12,000 rpm). The centrifugal force is generated by the rotor conductors and by the contained mass of the end rings. In various embodiments, the conductors are copper rods overcast with aluminum end rings. The collar may be fabricated from stainless steel and then press fit or shrink fit on the end ring. Stainless steel collars allow the use of high-conductivity pure aluminium or pure copper within the high-speed mixing rotor.

[0084] The maximum rotational speed of the die-cast hybrid induction rotor is improved by incorporating a thin-walled collar on the outer diameter of the end ring. The collar enables the end ring to resist higher hoop...

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PUM

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Abstract

The invention discloses an induction motor with a collar reinforced end ring. The induction motor includes a stator and a rotor. The stator is configured to generate a rotating magnetic field. The rotor is disposed inside the stator, separated from the stator by an air gap, and configured to rotate about an axis in response to a rotating magnetic field. The rotor includes a rotor core, a plurality of end rings, and a plurality of collars. The end rings are attached at opposite ends of the rotor core. Each end ring has one of a plurality of regions disposed outside the air gap. Each region has an outer surface. A collar is attached around the outer surface of each region under prestressing conditions. The prestressing condition is configured to maintain compressive stress in the end ring at a maximum design rotational speed of the rotor.

Description

technical field [0001] The present disclosure relates to a system and method for an induction motor having a collar reinforced end ring. Background technique [0002] A die-cast induction motor has a rotor that rotates inside a stator. The rotor includes a plurality of laminations having slots held by end rings. Conductors fill these slots to create a cage configuration. This cage induction machine is widely used in industrial applications. At high operating speeds, the rotor end rings can deform due to centrifugal stress in the end rings. Deformation can cause the end ring to expand, potentially leading to cracks. In severe cases, the expansion may cause the end rings to contact the inner wall of the stator. [0003] It is desirable to devise a technique for manufacturing and / or operating an induction motor with collar reinforced end rings. SUMMARY OF THE INVENTION [0004] An induction motor is provided herein. The induction motor includes a stator and a rotor. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K17/16H02K15/02
CPCH02K17/165H02K15/0012H02K17/20H02K5/15H02K9/22H02K1/2706
Inventor J·S·阿加皮欧E·H·张Y·S·梁
Owner GM GLOBAL TECH OPERATIONS LLC