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:
Mar. 18, 1997
Filed:
Nov. 17, 1995
Applicant:
Inventor:
Jinghan Tao, Shorewood, WI (US);
Assignee:
Allen-Bradley Company, Inc., Milwaukee, WI (US);
Primary Examiner:
Int. Cl.
CPC ...
H02M / ; H02P / ;
U.S. Cl.
CPC ...
318805 ; 314802 ; 314808 ; 314138 ;
Abstract
A method and/or apparatus used with a voltage/frequency driver for controlling a motor that maintains a motor driving magnetizing flux at low frequencies and maintains a constant desired motor speed despite relatively high slip at low frequencies. The voltage/frequency driver controls both magnetizing flux and motor speed without requiring sensing or calculating hardware in addition to hardware typically included with a voltage/frequency driver.