Claims
- 1. A high performance rotary stepper motor comprising:
- stator means having an active and passive portion, each comprising a plurality of pole positions, each of said pole positions including a plurality of magnetic stator elements on opposite sides of an axial air gap with nonmagnetic material located in the spaces between the extremities of said magnetic stator elements on each of said opposite sides of said air gap;
- winding means associated with said active portion at said pole positions on only one side of said air gap for generating flux paths transverse to said air gap;
- a rotor located within said air gap comprising a plurality of passive magnetic motive elements and nonmagnetic discontinuities including nonmagnetic material separating said motive elements, said motive elements having extremities juxtaposed to the extremities of said stator elements so as to close said transverse flux paths through said motive elements, said motive means and said motive elements having configurations such that all of said motive elements are always confined to said air gap with magnetic force acting on said magnetic motive elements at both sides of said air gap, said rotor further comprising nonmagnetic discontinuities including said nonmagnetic material so as to eliminate any substantial longitudinal flux leakage.
- 2. The stepper motor of claim 1 wherein said rotor comprises a substantially planar rotor adapted for rotary motion through said air gap.
- 3. The stepper motor of claim 2 wherein said motive elements comprise a plurality of discrete magnetic elements and said rotor further comprises a disc comprising nonmagnetic material in which said discrete magnetic elements are mounted.
- 4. The stepper motor of claim 1 wherein said active and passive portions are separated by said axial air gap and having no flux path between active and passive portion except through said motor.
Parent Case Info
This is a divisional, of application Ser. No. 809,646, filed June 24, 1977, now U.S. Pat. No. 4,198,582 issued Apr. 15, 1980.
US Referenced Citations (12)
Divisions (1)
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Number |
Date |
Country |
Parent |
809646 |
Jun 1977 |
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