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. 22, 1988
Filed:
Feb. 05, 1987
Robert C Smith, Hartford, CT (US);
The Superior Electric Company, Bristol, CT (US);
Abstract
A three-phase stepping motor having first, second, and third sets of stator poles, with the first and second sets of stator poles having single coils thereon and the third set having dual or bifilar coils thereon. The coils on the first set of stator poles and one of the coils on each pole of the third set of stator poles are connected to one phase of a two-phase drive. The coils on the second set of stator poles and the other of the coils on each pole of the third set of stator poles are connected to the other phase of a two-phase drive. The currents of the two drive phases are thus magnetically combined in the third set of stator poles to produce energization of the 'third phase'. In one embodiment, a twelve-pole, rotary, three-phase stepping motor with a 50-tooth rotor and a 48- , 50-, or 52-tooth-pitch stator produces a step angle of 1.8.degree. mechanical with a two-phase drive.