Commutator

Details Commutator Commutator

1999-06-08

2001-10-23

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S049540, C310S235000, C310S236000

Reexamination Certificate

active

06307296

ABSTRACT:

PRIOR ART
The invention is based on a commutator as set forth hereinafter. One commutator has already been proposed (German Patent Application 197 06851.0), which beginning at a connecting end face has at least one recess, extending toward a through bore, and in the mounting of the commutator on a rotor shaft, epoxy resin can penetrate this recess and thereby fix the commutator to the rotor shaft. A bead of the epoxy composition forms on the connecting end face of the commutator in the process, but its outer contour is relatively undefined, so that repeatedly problems occur in winding the rotor winding.
ADVANTAGES OF THE INVENTION
The commutator of the invention has the advantage over the prior art that in a simple way, a fixation of the commutator by means of the insulating means (epoxy-based coating powder) applied to the rotor shaft and the rotor core is possible without forming a bead of the insulating means that impairs winding of the rotor winding. To that end, the through bore of the commutator can be made with a clearance fit or transition fit to the rotor shaft, so that when it is mounted, the commutator can be slipped easily onto the rotor shaft, thus avoiding both damage to the surface of the rotor shaft and internal strains in the commutator.
By the provisions recited herein, advantageous refinements of and improvements to the commutator are possible.
It is advantageous to make the receiving bore cylindrical, which creates a large receiving cross section for the bead of insulating means.
It is also advantageous, beginning at the shoulder, to form at least one indentation in the conical bore or to provide at least one indentation in the wall of the receiving bore, in order to assure secure, form-locking fixation of the commutator to the rotor shaft in a manner fixed against relative rotation.


REFERENCES:
patent: 3129350 (1964-04-01), Clark
patent: 3566460 (1971-03-01), Yamaguchi
patent: 3996660 (1976-12-01), Hancosk
patent: 4071796 (1978-01-01), Nippert
patent: 4705977 (1987-11-01), Shibata et al.
patent: 5140213 (1992-08-01), Nettelhoff et al.
patent: 5760517 (1998-06-01), Stoplmann

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