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:
Feb. 07, 1995
Filed:
Mar. 31, 1993
Applicant:
Inventor:
Michael Mann, Berlin, DE;
Assignee:
Otis Elevator Company, Farmington, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; H02P / ; H02M / ;
U.S. Cl.
CPC ...
364483 ; 318800 ; 318805 ; 187391 ; 363 98 ;
Abstract
All N parameters of an induction machine equivalent circuit may be determined by providing a stator voltage such that the induction machine produces no torque, measuring a stator current for at least N-1 frequencies, determining the tangent of the angle .phi. between the stator voltage and stator current at said frequencies, and solving N-1 equations R(.omega.)tan.phi.+X(.omega.)=0, given one of the parameters, said frequency values and said associated values for tangent .phi., where R(.omega.) and X(.omega.) are the real and imaginary components of the complex stator impedance of the induction machine.