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:
Apr. 30, 1991
Filed:
Mar. 30, 1990
Applicant:
Inventor:
Howard F Hendricks, Harleysville, PA (US);
Assignee:
Penn Engineering & Manufacturing Corp., Danboro, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318254 ; 318138 ;
Abstract
12-step motor commutation is provided by a three-phase sinusoidal signal generator and related circuitry. Circuitry which compares the voltage outputs of two primary signals provides two additional switching points for every 360 electrical degrees. Three comparator circuits provide six additional switching points. Primary voltage outputs are weighted in the ratio of 2:1 prior to comparison.