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:
Sep. 07, 1982
Filed:
Mar. 24, 1980
Applicant:
Inventor:
Donald E Fulton, Stoneham, MA (US);
Assignee:
The Charles Stark Draper Laboratory, Inc., Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318807 ; 318809 ; 318811 ;
Abstract
A control system for an induction machine. The system includes a multiphase variable frequency oscillator adapted to provide at least one pair of signals having frequencies proportional to the sum of a desired slip frequency and the frequency of rotation of the induction motor shaft, where the signals are in phase quadrature. A weighting network amplitude-scales one of each pair of signals by a factor related to the desired slip frequency. A summing network then generates an excitation signal for each stator winding by summing the amplitude-scaled signal and its associated quadrature signal corresponding to that stator winding.