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:
Aug. 11, 1981
Filed:
Jun. 28, 1979
Franz Spirk, Berlin, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
In a synchronous electric machine with salient poles in its rotor, which are supported by a lamination chain, one sided large enlargements of the lamination chain deviating from a circular shape are prevented by straps arranged between the hub body and the lamination chain, the attachment of the straps at the lamination chain, with the machine standing still, being with a play which corresponds approximately to the mean expansion of the lamination chain at the runaway speed. If this play is taken up through expansion of the lamination chain due to one-sided forces, then the straps prevent further expansion. The invention is of advantage especially for slowly rotating hydroelectric generators.