Electrical generator for vehicle with rotor exciter winding disp

Details Electrical generator for vehicle with rotor exciter winding disp Electrical generator for vehicle with rotor exciter winding disp

1997-04-03

1999-05-04

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310234, 310263, 29605, H02K 1922

Patent

active

059006889

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an electrical machine, in particular a generator for vehicles.


PRIOR ART

In vehicles, such as motor vehicles and railroad cars, it is known to use generators for battery charging and as an on-board power supply. To that end, the generators have a claw pole rotor, rotatably supported in a stator housing. The claw pole rotor has an exciter winding, disposed coaxially to a rotor shaft and in a manner fixed against relative rotation, and pole fingers of the claw poles fit over its circumferential surface. The exciter winding is disposed on a pole core, which is connected to the rotor shaft in a manner fixed against relative rotation. For fixing the exciter winding to the pole core, it is known to bind the exciter winding with bands after the winding operation, so as to achieve a disposition of the exciter winding in a manner fixed against relative rotation. Hooks, adhesive tapes, etc. may be used in addition, which are intended to assure a stable position of the exciter winding in the period until its impregnation and mounting. A disadvantage, however, is that impregnation of the exciter winding is made more difficult by the binding bands, since the impregnating agent is hindered from uniformly entering the exciter winding. Another disadvantage is that because of the additional disposition of fastening means and binding bands, an imbalance of the exciter winding can occur, which can cause vibration especially in extremely high-speed claw pole rotors. The binding bands can also come loose, which can impair the operation, if it does not even cause destruction of the entire-electrical machine.


SUMMARY OF THE INVENTION

In an electrical machine in accordance with the invention, it is possible, unlike the prior art, to dispose the exciter winding on the rotor shaft in a manner that is secure against being shaken and spun apart by centrifugal force. Because the exciter winding is disposed on a winding carrier that has means for firmly clamping the winding ends, it is possible in a simple way to fix the exciter winding without requiring the additional disposition of binding bands or the like. On the one hand, this avoids adding elements that cause imbalance of the exciter winding, and on the other, it assures accessibility of the exciter winding over the entire surface for the introduction of impregnating agents. As a result, improvements in quality of the exciter windings are attained, since better penetration of the impregnating agent is assured over the entire depth of the exciter winding. Because binding bands and additional retaining means are omitted, the production cost for prefabricating the exciter winding can also be reduced, since less time and less material are needed.
In a preferred feature of the invention, it is provided that the winding carrier is formed by an insulating body, which encompasses the exciter winding in U-like fashion and whose flange toward the wiper rings has recesses open at the edges, for receiving the winding beginning and the winding end. As a result it becomes possible in a simple way at the beginning of the winding operation of the exciter winding to extend the winding beginning through a first recess, and after the conclusion of the winding operation to extend the winding end through a second recess. Because the winding ends are fixed in the recesses of the winding carrier, an additional locking of the entire exciter winding is no longer necessary. The recesses are preferably embodied such that they have a radial length such that the winding beginning and the winding end can be clamped in place in alignment with the inside circumference and outside circumference of the exciter winding. By means of a special embodiment of the recesses, preferably by a recess embodied as a notch in the direction of the rotor shaft, a self-inhibiting locking of the winding end is attained, which assures a shakeproof and centrifugal force-proof seating even at high rotary speeds of the rotor assembly.


BRIEF DESCRIPTION OF THE DRAWINGS

The

REFERENCES:
patent: 2339432 (1944-01-01), Stahl
patent: 3603825 (1971-09-01), Sheridan et al.
patent: 3671906 (1972-06-01), Hodges et al.
patent: 5021696 (1991-06-01), Nelson
patent: 5361011 (1994-11-01), York

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