Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-12-09
2001-07-17
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S214000, C310S215000, C310S071000
Reexamination Certificate
active
06262509
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority of German Patent Application Ser. No. 198 58 208.0, filed on Dec. 17, 1998, the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a protective conductor connection for a laminated stator core of an electric motor.
German Patent DE-U 76 30 468 discloses a protective conductor connection for motors provided with a protective conductor connection that is inserted into a frontal opening of the stator core and/or the end shield and is clamped-in form-fittingly and/or frictionally by this end shield. The disadvantage in this case is that the insertion groove must be milled or otherwise worked into the end shield or the stator core at a later date.
Another protective conductor connection for motors is disclosed in European Patent 0 026 833 B1. The protective conductor in this invention can be inserted with an insulated end into an insertion bore, formed by holes that are located one behind the other and are worked into the individual sheet-metal segments while these are stamped out. The protective conductor is secured in the preferably axially extending insertion bore, which is located directly below the outer circumferential surface of the stator core, in that the insulated end is clamped in by a wedging tool that is arranged on the outside, above the insertion bore. The drawback of such an arrangement is that a defined insertion of the protective conductor connection into the bore is not possible without additional means. In particular, additional work must be done to prevent the protective conductor from being inserted past the insulated part of the end.
It is, therefore, the object of the present invention to provide a protective conductor connection on a laminated stator core of an electric motor, which is easy to produce and ensures secure electrical contacting.
SUMMARY OF THE INVENTION
The above object is achieved by providing one of the two sheet-metal segments that form the frontal sides of the stator core, with a stamped-in grounding tongue, with which a protective conductor can be fixedly connected.
Technologically, the simplest way to produce the protective conductor connection is to produce it solely in one stamping operation, along with the final sheet metal segment for the laminated stator core. Following this, all the sheet-metal segments belonging to the stator core are combined The productive conductor is preferably provided with a pin bushing at its insulated end, which pin bushing can be fitted over the free end of the grounding tongue and can be snapped in.
Additional advantageous embodiments of the subject matter of the invention are described below.
REFERENCES:
patent: 4602178 (1986-07-01), Larsson
patent: 5640064 (1997-06-01), Boyd, Jr. et al.
patent: 5821649 (1998-10-01), Langhorst
patent: 5861689 (1999-01-01), Snider et al.
patent: 7630468 (1977-02-01), None
patent: 0026833 B1 (1981-04-01), None
Hadeler Dieter
Hauke Dieter
Safavi Fereidun
Enad Elvin
FHP Motors GmbH
Kinberg Robert
Lam Thanh
Spencer George H.
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