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. 03, 1992
Filed:
Oct. 24, 1990
Robert Hammer, Brookfield, CT (US);
IBM Corporation, Armonk, NY (US);
Abstract
A combined linear-rotary direct drive step motor, having a rotary section and a linear section in a single housing, comprising a cylindrically shaped variable reluctance linear step motor; a modified hybrid permanent-magnet rotary step motor; and a common shaft shared by said linear step motor and said rotary step motor. The teeth of the rotary motor are circumferentially spaced around the stator pole faces and rotor; while in the linear portion of the motor, the teeth are longitudinally spaced along the face of the stator poles and rotor. Except for the teeth, the shape of the stator poles in the rotary and linear sections are identical. The laminated stators and rotors reduce eddy current losses at high stepping speeds. The stator coils of both motor sections are separate and can be energized independently allowing any combination of rotary or linear motion. According to alternate embodiments of the invention, the rotor is fabricated from stacked laminations, in a waffle board like configuration.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile