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Rotor for an electric motor

A technology of rotors and rotor laminations, applied in the manufacture of squirrel cage rotors, motor generators, asynchronous induction motors, etc., can solve the problems of rotor deformation, cracking, and different size changes.

Inactive Publication Date: 2008-12-17
DANFOSS COMPRESSORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the rotor laminations and squirrel cages are made of different materials and have different geometries, the dimensions change differently and this leads to tension, which in the worst case can lead to deformation or cracking of the rotor

Method used

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  • Rotor for an electric motor
  • Rotor for an electric motor
  • Rotor for an electric motor

Examples

Experimental program
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Effect test

Embodiment Construction

[0051] figure 1 A rotor according to the invention is shown. The rotor 1 comprises rotor laminations 2 made of a magnetically conductive material and a squirrel cage 3 made of a conductive material. The squirrel cage forms an elongated conductor 4 which extends through the rotor lamination 2 and terminates in short-circuit rings 5 ​​, 6 on axially opposite sides of the rotor lamination 2 . One of the short-circuit rings 5 ​​, 6 comprises a first element 7 and a second element 8 . The first element 7 is positioned directly adjacent to the end face 10 of the rotor lamination 2 between the second element 8 and the rotor lamination 2 . The second element 8 comprises a peripheral portion 9 which surrounds the first element 7 and from which the elongated conductor extends into the rotor lamination 2 . The second element 8 thus fixes the first element 7 to the rotor lamination 2 .

[0052] figure 2 The squirrel cage 3 is shown, ie the rotor with the rotor laminations removed. ...

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PUM

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Abstract

The invention provides a method of making a squirrel cage rotor for an electrical motor, and to a rotor for such a motor. The rotor comprises a rotor stack of a magnetically conductive material and a squirrel cage of an electrically conductive material. At least one of the short circuit rings is made by compression and sintering of a powder in which a solid element is embedded. The solid element facilitates manufacturing by increasing strength of potentially weak areas of the rotor, e.g. around openings into the shaft bore, rotor slots etc.

Description

technical field [0001] The invention relates to a rotor and a method for manufacturing the rotor of a motor. The rotor is a squirrel-cage rotor with rotor laminations of magnetically conductive material and a partially embedded squirrel cage of conductive material. Background technique [0002] In one type of electric machine commonly used, the stator comprises a stator winding or windings in which an electric field creates a rotating magnetic field. Internally, or in the case of an external rotor located around the outside of the stator, the rotor is rotationally connected to rotate under the action of a magnetic field. There are various principles. In a synchronous motor, the rotor is magnetized, or includes a set of permanent magnets. This type of motor is simple and reliable, the rotational speed of the rotor corresponds to the rotational speed of the electric field in the stator windings. However, in some applications, synchronous motors have poor starting character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K15/00H02K15/09H02K17/16
CPCH02K15/0012Y10T29/49012
Inventor N·C·韦劳克
Owner DANFOSS COMPRESSORS