Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1999-02-16
2001-03-20
Hall, Carl E. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S522100, C310S049540, C310S216055
Reexamination Certificate
active
06202286
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for producing a joint connection, in particular between exciter poles and the pole housing of an electrical machine, as well as an electrical machine produced by that method.
In electrical machines that have an electric excitation, it is known to secure the exciter poles that carry the exciter winding to the inside of a substantially cylindrical pole housing. Securing the exciter poles to the pole housing can be accomplished in a known way, for instance by means of a screw connection, welded connection, or adhesively bonded connection. In addition, a method is known from French Patent Application FR 2 488 749, in which exciter poles are secured to the pole housing by means of a force-locking joint connection, in which material of the pole housing is positively displaced into a conical recess of the exciter poles. A disadvantage of this is that the conical recesses can be produced only with great effort using precision tools. To achieve uniform, reliable positive displacement of the material of the pole housing into the conical recess of the exciter poles, which widens toward the bottom, high-precision and thus complicated and expensive adjustment of the joining tools relative to the recess is necessary.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of making articulated connections between exciter poles and a pole housing of an electrical machine and to provide an electrical machine made by that method which does not have the above-described disadvantage.
The method of making the joint connection between the exciter poles and a pole housing of an electrical machine by means of a joining tool includes providing an exciter pole having a recess at a joining point on a pole housing and positively displacing material of the pole housing pointwise by means of the joining tool into the recess of the exciter pole at the joining point to make a form- and force-locking connection of the exciter pole with the pole housing.
With the method of the invention, it is possible by comparison, in a single way, to establish a form- and force-locking connection between the exciter poles and the pole housing, in which a secondary air gap between the exciter poles and the pole housing is reduced to a minimum. Because the material of the pole housing and of the respective exciter pole is positively displaced by the joining tool pointwise at at least one joining point into a corresponding recess of the exciter pole, a force-locking connection between the exciter poles and the pole housing can be attained by means of simple method steps, which can moreover, be performed using a tool of simple construction. High joining forces are brought to bear, which over the long term assure large-area contact of the exciter poles with the pole housing. By imposition of the high joining forces, the gap between the exciter poles and the pole housing is reduced to its technologically feasible minimum. The merely pointwise positive displacement of the material of the pole housing into a corresponding recess of the exciter poles assures that the material loss of the exciter poles is extremely slight, thereby essentially precluding an impairment of these electromagnetic properties.
Advantageous features of the invention will become apparent from the characteristics recited in the dependent claims.
REFERENCES:
patent: 2488749 (1982-02-01), None
Carrera Serafin Balsa
Franz Peter
Kessler Hans-Juegen
Kopp Wolfgang
Kreter Bernd
Hall Carl E.
Robert & Bosch GmbH
Striker Michael J.
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