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:
Jun. 14, 1977
Filed:
Nov. 26, 1975
Hi Dong Chai, Binghamton, NY (US);
Joseph Paul Pawletko, Endwell, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A three phase rotary stepper motor of the variable reluctance type comprises a rotor and an annular stator having three pairs of diametrically opposed stator poles wound with bifilar windings. The stator windings are connected so that opposed poles are energized as a pair having the same polarity. The bifilar winding is connected so that pole pairs are energized with either polarity. A two phase energization scheme is used which causes adjacent poles of two pole pairs to have opposite polarity, while the third pole pair is magnetically neutral. Every three steps of the sequence the magnetically neutral pole pair is magnetized with the reverse polarity.