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:
Dec. 20, 1988
Filed:
Mar. 18, 1987
Robert C Smith, Hartford, CT (US);
Gary E Horst, Manchester, MO (US);
The Superior Electric Company, Bristol, CT (US);
Abstract
A three-phase stepping motor having magnetically interacting stationary and moving members, the stationary member having first, second, and third sets of stator poles, each stator pole having thereon a coil for magnetic energization thereof. The coils on the first set of stator poles and one-half of the coils on 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 half of the coils on the third set of stator poles are connected to the other phase of a two-phase drive. The fluxes produced by the currents of the two drive phases are, in effect, magnetically combined in the moving member, as if the third set of poles wewre energized by a 'third phase'. In one embodiment, a twelve-pole, rotary, three-phase stepping motor with a 50-tooth rotor and a 48-, 50-, 52-, or variable-tooth-pitch stator produces a step angle of 1.8.degree. mechanical with a two-phase drive.