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:
Jan. 12, 1999
Filed:
Jun. 09, 1997
Applicant:
Inventors:
Assignee:
Fuji Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ; H02P / ;
U.S. Cl.
CPC ...
318809 ; 318804 ; 318805 ;
Abstract
To provide a trans-vector controller for an alternating current ('AC') motor that facilitates operating the secondary resistance of the AC motor without experimentally rotating the AC motor. In a preferred embodiment, the variable speed control circuit, including a secondary resistance value generating device, changes the direct current ('DC') exciting current and operates the secondary resistance of an induction motor by superimposing an AC signal with small amplitude outputted from a AC signal generator onto a reference current value immediately before the start of the induction motor in the state of DC excitation.