Direct-current dynamo electric machine, and method of manufacture

US4782254A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Helmut Kreuzer · Schwieberdingen, DE
• Klaus Meier · Geislingen an der Steige, DE

Key dates

• Filing date: Jan 16, 1987
• Grant date: Nov 1, 1988
• Expiry date: Jan 16, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49071
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The commutating poles of vehicular-type d-c motors, for example for trolley buses or trolley cars, are made by winding, on edge, a copper strip, permitting the wound copper strip to resiliently, spring-like expand so that the individual spiral loops thereof will be slightly spaced from each other, and then exposing the copper strip in a fluidized bed to an insulating powder, for example polyethylene or polyurethane, which is subsequently cured in a hardening or sintering process.