Dynamoelectric rotary machine with elements for reducing tonal noises

Abstract

A dynamoelectric rotary machine includes a stator, which has a winding system arranged in grooves disposed between teeth of a magnetically conductive body and a winding head on the end faces of the stator in each case. A rotor with a cage ring is arranged rotatably about an axis and during operation of the dynamoelectric rotary machine is in electromagnetic interaction in a motor-driven or generator-driven manner with the winding system of the stator arranged in the grooves by way of an air gap. Comb-type elements are disposed on the end faces of the stator. The comb-type elements assume an extensive intermediate space between the winding system projecting from the end faces of the stator, so that tonal noises which are produced during operation of such an electric machine are at least reduced.

Claims

1. A dynamoelectric rotary machine, comprising: a stator having a magnetically conductive body with grooves formed therein and teeth and a winding system disposed in said grooves, said grooves disposed between said teeth of said magnetically conductive body; a respective winding head disposed on end faces of said stator; a rotor having a cage ring and is disposed rotatably about an axis, and during operation of the dynamoelectric rotary machine said rotor is in electromagnetic interaction in a motor-driven or generator-driven manner with said winding system of said stator disposed in said grooves by way of an air gap formed between said rotor and said stator; and comb-type elements disposed on said end faces of said stator, and assume an extensive intermediate space between said winding system projecting from said end faces of said stator, so that tonal noises, which are produced during the operation of the dynamoelectric rotary machine, are at least reduced, said comb-type elements being structured segmentally with each segment having multiple tines, and said comb-type elements being formed from an insulating material.

2. The dynamoelectric machine according to claim 1, wherein: said rotor has a rotor magnetically conductive body; and said comb-type elements have an axial thickness which generally corresponds to a distance of said cage ring from an end face of said rotor magnetically conductive body.

3. The dynamoelectric machine according to claim 1, wherein when viewed in a peripheral direction, said comb-type elements on said end faces of said stator are composed in each case of several segments.

4. The dynamoelectric machine according to claim 1, wherein a shape of said teeth of said stator corresponds generally to a comb-type molding of said comb-type elements.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIG. 1 is a diagrammatic, partial cross-sectional view of a dynamoelectric machine according to the invention;

(2) FIG. 2 is a partial longitudinal sectional view of an electric machine;

(3) FIG. 3 is a partial longitudinal sectional view of the electric machine with elements;

(4) FIG. 4 is a partial perspective view of a stator; and

(5) FIG. 5 is a partial perspective view of the stator.

DETAILED DESCRIPTION OF THE INVENTION

(6) Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown in a partial side view, a stator 2 of a dynamoelectric machine 1, in particular an asynchronous machine and a rotor 12. The rotor 12 has conductor rods 13, which, in closed rotor grooves according to FIG. 1 or also half open rotor grooves, point to an air gap 10 in the dynamoelectric rotary machine 1. Furthermore, the rotor 12 has axially running cooling ducts 20, see FIG. 2. Arranged in the stator 2 is a winding system 5, which can be assembled for instance from toothed coils, a single-layer winding system or multi-layer winding system. The stator 2 can also have cooling ducts running axially within or on the surface of the stator 2.

(7) During operation of the dynamoelectric machine 1, an air flow 6, which divides into a radial component 62 and a tangential component 61, takes place on account of a rotation 18 of the rotor 12 about an axis 17 (not shown). The radial component 62 normally runs on end faces of the stator 2. The tangential air flow 61 runs in the air gap 10 or along a cage ring 14 of a squirrel cage of the rotor 12. The radial component 62 of the air flow 6 now causes noises in the region of the exits of the winding system 5 on the end faces of the stator 2.

(8) An axial distance 15 according to FIG. 2 between the cage ring 14 and the end face of the rotor 12 results in the air flow 6 in the region of the winding system 5 of the stator 2 and thus in sound emissions. On account of the inventive elements 9, in accordance with FIG. 3 the radial component 62 of the air flow 6 is now suppressed in its development.

(9) Here the elements 9 are above all arranged in the region between the end face of the stator 2 and the axial height of the cage ring 14 of the rotor 12. The elements 9 here have an axial minimum extension, which extends axially from the end face of the stator 2 up to at least the height of the inner edge of the cage ring 14.

(10) The magnetically conductive body of the stator 2 and rotor 12 are embodied as laminated cores of rotor 12 and stator 2 and in the present case are laminated by thrust plates 4.

(11) Contrary to FIG. 2, FIG. 3 shows in addition elements 9 which are attached in the region between the end face of the laminated core 3 of the stator 2 and the winding head 7. In this way the previously available intermediate spaces are now closed in the region of the teeth, in other words between the axial exit of the winding coils.

(12) FIG. 4 shows, in a partial perspective representation, the stator 2, which is provided on the end face with an element 9, which is positioned on the thrust plate 4. The comb-type embodiment of the element 9, in other words the shape of the “forks”, is essentially geared to the cross-sectional shape of the teeth of the laminated core 3 of the stator 2 and point radially inward to the air gap 10. Furthermore, the groove box insulation for inserting the winding is set up in the left part of this representation.

(13) FIG. 5 shows, in a further partial perspective representation of the stator 2, the element 9 which is embodied as a segment and which is disposed on the end face of the stator 2.

(14) Furthermore, FIG. 4 and FIG. 5 show that these elements 9 are attached preferably by use of a dual-sided adhesive tape, immediately after providing the magnetically conductive body, in other words for instance after sintering the magnetically conductive body or the punch-packaging of the laminated core 3 of the stator 2. This takes place before the groove box insulation is inserted in the grooves 8 and the winding system 5 is in place. An impregnation and curing process is then introduced, which, inter alia, leads to reinforcing the elements 9 on the end faces of the stator 2.

(15) Dynamoelectric machines 1 of this type are above all used in rapidly running dynamoelectric rotary machines, such as e.g. vehicles of all types, such as rail vehicles, E-cars, mining trucks etc.