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Stator for electric moter

A technology of stator and stator teeth, applied in electrical components, electromechanical devices, electric components, etc., can solve problems such as insufficient, and achieve the effect of increasing the surface

Inactive Publication Date: 2007-10-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, cooling through the fan wheel is not enough

Method used

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  • Stator for electric moter
  • Stator for electric moter
  • Stator for electric moter

Examples

Experimental program
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Embodiment Construction

[0024] FIG. 1 shows a universal electric machine 10 according to the prior art in longitudinal section. Only the components of universal motor 10 that are relevant to the invention are described below. The universal electric machine 10 includes a housing 20 in which a stator 30 is mounted in a rotationally fixed manner. An armature 40 is fastened to the armature shaft 22 in a rotationally fixed manner, which has armature teeth 44 and an armature slot 42 therebetween for receiving an armature winding (not shown). On one end side of the armature 40 , a commutator 25 is likewise fixed in a rotationally fixed manner on the armature shaft 22 . On the other end side of the armature 40 , a fan wheel 60 for cooling the universal motor 10 is likewise arranged non-rotatably on the armature shaft 22 . The fan wheel has fan wheel blades 62 which face the armature 40 . In order to generate an axial flow of air in the universal motor 10 (indicated by arrow 64 in FIG. 1 ), an inlet openin...

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PUM

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Abstract

The invention describes a stator (30) for an electric machine, in particular for a universal motor, comprising a return ring (31) and stator teeth (32) for accommodating a stator winding (35). The return ring (31) comprises cooling ribs or fins (50) which may point outward or inward towards the armature.

Description

technical field [0001] The invention relates to a stator for an electric machine, in particular for a universal electric machine. Background technique [0002] Universal motors are widely used, for example, in power tools. Since the current flows not only through the armature winding but also through the field winding in a universal motor, a lot of heat is generated which generally heats the entire motor. In order not to damage the motor due to violent heating, it is necessary to ensure that the motor is sufficiently cooled. In electric tools, air is sucked in from the outside for cooling, for example via a fan wheel, as described, for example, in DE 102 56 805 A. The fan wheel is non-rotatably located on the armature shaft between the armature and the reducer. When rotating, the fan wheel generates an air flow, which flows axially through the power tool and dissipates heat outward. [0003] In order to achieve good cooling, as much air as possible must be conveyed throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/20
CPCH02K1/20H02K5/18H02K9/22H02K1/146H02K7/14H02K9/227
Inventor 于尔根·维克拉尔夫·达默茨
Owner ROBERT BOSCH GMBH