Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-06-06
1998-06-02
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310235, 310236, H01R 4306
Patent
active
057605173
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a plug-in commutator, and a process for its manufacture.
In a known plug-in commutator of this type (WO 95/14319), the force needed to insert the segment into the groove is so great that disturbances during insertion cannot be ruled out. If one were to reduce this force by reducing either the overdimension of the segments and/or the underdimension of the groove, then a reliable positioning of the segments in the hub body can no longer be guaranteed.
OBJECTS AND SUMMARY OF THE INVENTION
The problem the invention seeks to solve, then, is to create a plug-in commutator in which the segments are positioned in a reliable fashion in the grooves in spite of the fact that the force necessary for the insertion of the segments into the grooves is reduced. The plug-in commutator solves this problem with the properties of the independent apparatus claim, whereby below an overdimension, an underdimension that brings about a clamping force is also understood. A process for the manufacture of the plug-in commutators according to the invention is also the subject of claim 15 the independent process claim. Advantageous designs of the plug-in commutator according to the invention and the manufacturing process according to the invention are the subject matter of the subclaims.
For an exact and reliable positioning of the segments in the grooves, it is completely satisfactory--as has been demonstrated--when the maximum value of the clamping force exerted on the segments is determined by the clamping in the area of the two end sections of the segments. Moreover, the result of this is that the high clamping forces, and in turn, the friction that must be overcome when inserting the segments in the grooves, occurs only in the two end sections, which considerably reduces the force necessary to insert all the segments in the grooves at the same time, whereby the maximum value of this force only occurs when the lagging end of the segments enters into the grooves.
In a preferred working model, the grooves have the necessary overdimension in that end section that takes up the leading end of the segments during insertion; and the segments have the necessary overdimension in the segments in their lagging end sections. The segments, then, can be inserted into the grooves with very little force until the leading end reaches the end section of the grooves displaying the overdimension and the leading end section of the segments enter into the grooves.
The axial extension of the zones that have the overdimension can be different. In this connection, a larger axial extension comes into consideration in both the area of the end section of the segments that lead during insertion and in the area of its lagging end. In the preferred model, the axial extension of the zones displaying the overdimension is around 15% in the area of the leading end section; in the area of the lagging end section it is around 5% of the length of the parts of the segments forming the commutator path.
In the middle section of the segments and grooves that lies between the two end sections a gap can exist between the surface areas of the segments, which overlap in radial direction, and the hub body; relatively speaking, this gap is usually, however, quite small.
In a preferred form of the model, the segments display a middle piece--which extends in wedge-like form from the headpiece to the footpiece--between their headpiece, which forms the commutator path, and a footpiece; this middle piece is clamped in between the sides of the corresponding groove. Thanks to the wedge form of this middle part, the clamping force acting on the sides of the middle part has a radial component, which presses the surfaces of the segments, which are intended for radial positioning, against the surfaces of the hub body corresponding to them.
The radial positioning of the segments can take place by pressing the shoulders against the surface area of the crosspieces turned against them when--as is the case in a preferred working model--the
REFERENCES:
patent: 4983871 (1991-01-01), Strobl
Kirkwood Industries GmbH
Mullins B.
Stephan Steven L.
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