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:
Aug. 30, 1977
Filed:
Jul. 09, 1975
Applicant:
Inventors:
Heinz Lutz, W.i.S.-Breitenstein, DT;
Volker Zimmermann, Schoenaich, DT;
Rainer Zuehlke, Warmbronn, DT;
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 / ; 310266 ;
Abstract
A rotor stator assembly comprising a stepping motor having an improved torque-to-inertia ratio resulting from a substantial reduction in moment of inertia due to the conical shape of the rotor. A core energized by a DC coil is disposed axially of the base of the conical rotor and the magnetic path is through the base of the rotor, out its periphery, through the stator, through conductive members and back to the core. There is a further increase in torque-to-inertia ratio which is due to a decrease in rotating mass when the rotor is hollow.