Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-01-11
1994-10-04
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310 45, 310198, 310208, 310261, 310270, 310271, H02K 348
Patent
active
053529480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an armature having windings laid in slots of an armature laminate stack, which are held down in the slots by elongated, elastic slot seals and form winding overhangs on the end faces of the armature.
An armature of the general type as that of the invention is disclosed in DE-AS 1,538,908. Although in this armature, the winding transition region between a winding overhang and a commutator is relatively securely fixed and protected against centrifugal forces, the winding overhangs or the windings situated in the slots of the armature laminate stack are not protected by separate means. Armatures configured in this way do not withstand the loads to which modern electric tools are exposed, since excessive demands are made on them by jarring blows and vibrations such as occur, for example, with hammer drills or right angle grinders. In addition, there is the high loading, usual with such machines, due to environmental air, which contains abrasive dust and is used for forced cooling, owing to which the winding overhangs are abraded, with the result that the armature is destroyed.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved armature of the above-described type which does not have the above-described disadvantages.
These objects and others which will be made more apparent hereinafter are attained in an armature for a high-speed electric motor having windings laid in slots of an armature laminate stack, which are held down in the slots by elongated, elastic slot seals and form winding overhangs on the end faces of the armature.
According to the present invention, at least one of the slot seals follows a contour of the winding overhangs in an armature longitudinal direction, especially along the surface, and extends up to the end faces of the armature and is secured or held on the armature there by a cord winding or ring.
The armature according to the invention have the advantage that reinforcement consisting of the slot seals hitherto customary in any case can be produced in a particularly sample way. This reinforcement can absorb the strong mechanical vibrations which loosen or rupture the winding, such as occur, for example, given use in hammer drills or right angle grinders. However, it also protects the winding overhangs both against abrasion by cooling air which contains abrasive dust and against the action of centrifugal forces when the armature is rotating at maximum speeds, and additionally improves the cooling of the electric motor due to the ventilator effect of the rib-like bulges on the winding overhangs.
Advantageously the cord windings extend circumferentially around the armature and can be formed by one or more of the slot seals themselves.
BRIEF DESCRIPTION OF THE DRAWING
The objects, features and advantages of the present invention will now be illustrated in more detail by the following detailed description, reference being made to the accompanying drawing in which:
FIG. 1 is a side elevational view of one embodiment of the armature for a high-speed electric motor according to the invention;
FIG. 2 is a side elevational view of another embodiment of the armature according to the invention; and
FIG. 3 is a side elevational view of an additional embodiment of the armature according to the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
An exemplary embodiment of an armature 1 shown in the drawing consists of an armature shaft 3 which supports an armature laminate stack 5 having slots 7. Guided through the slots 7 are windings 21 which consist of an electrical conductor winding overhangs 9, 11 on the armature end faces are extended in an armature longitudinal direction L to form and are connected with their ends to a collector 13.
The slots 7 are filled with slot seals 15 treated with impregnating resin. In the drawing only the uppermost and lowermost slot seals 15 are shown covering the slots 7 and the windings 21 held in them for simplicity of illustration. The remaining slots 7 are
REFERENCES:
patent: 2078024 (1937-04-01), Roth
patent: 2232812 (1941-02-01), Studer
patent: 2465820 (1949-03-01), Sharrow et al.
patent: 2896100 (1959-07-01), Axelson
patent: 3509621 (1970-05-01), Honsinger
Eule Meinhard
Grammer Werner
Kirn Manfred
Kraemer Gerhard
Robert & Bosch GmbH
Skudy R.
Striker Michael J.
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