The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 1987
Filed:
Sep. 29, 1986
Roald A Rindal, Roseville, CA (US);
Bobby D McKee, San Jose, CA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A homopolar dynamoelectric machine is provided with a rotor having a central axis and being mounted for relative rotation with a stator structure that supports a field coil encircling the rotor and has a main pole piece for directing magnetic flux produced by current flowing in the field coil into a first section of the rotor. Brush assemblies which are capable of making sliding electrical contact with a current collection zone of the rotor extend longitudinally adjacent to that current collecting zone and include a plurality of contact elements. These contact elements are packed in an increasing density in a longitudinal direction from one end of the brush assembly to the other end. The use of a variable packing factor for the contact elements of the brush assembly results in more uniform heating of the rotor in the current collecting zone, thereby minimizing the peak rotor temperatures and permitting the machine to operate for longer time periods.