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. 09, 1988
Filed:
Feb. 05, 1986
Applicant:
Inventors:
Makoto Nohmi, Kawasaki, JP;
Shoji Miyamoto, Kawasaki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318338 ; 318245 ; 3183 / ;
Abstract
A system for driving a motor, comprising a DC power supply source, a chopper apparatus switching voltage of the DC source to convert it into predetermined voltage and a shunt DC motor, wherein an armature and a field winding are connected in series and both ends of the series circuit are connected to the positive and negative terminals of the DC source and at the same time voltage at the junction point between the armature and the field is controlled by the chopper apparatus, is provided.