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AssigneeGerhard Berger GmbH & Co. Fabrik Elektrischer Messgerate
InventorsKlaus Geppert, Gunter Heine, Karl Hubner, Gunter Ose, Bernd Seeger, Claus Schaffer, August Spiesberger
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A stepping motor of the homopolar design with a step angle of 3.6.degree. and having a generally cubic form is disclosed. The motor includes a generally square, single-section laminated stator which has only four stator poles extending radially inwardly from the middle regions of the straight sides, and a concentric rotor secured to a shaft journaled in a pair of bearing bells fixed to the stator at the opposite faces thereof and having the same generally square configuration. The rotor includes a disc-shaped permanent magnet of high remanent energy density (B.times.H).sub.max .gtoreq.10.times.10.sup.6 GOe, and a pair of annular steel rotor elements provided at the working air gap with identical numbers Z.sub.r of rotor teeth of pitch .tau..sub.r =360.degree./Z.sub.r. Each stator pole is provided at the working air gap with four or five stator pole teeth of pitch .tau..sub.s =360.degree./Z.sub.s, where Z.sub.s is the theoretically maximum available number of stator pole teeth and must be evenly divisible by 4, and Z.sub.s =Z.sub.r -1.+-.k where k is an even integer and 0.ltoreq.k.ltoreq.6. A special twin-section insulation member adapted to be axially fitted into the stator from the opposite faces thereof and designed to permit simultaneous machine winding of the field windings onto the respective stator poles is also disclosed. This abstract is not to be taken either as a complete exposition or as a limitation of the present invention, however, the full nature and extent of the invention being discernible only by reference to and from the entire disclosure.
In a stepping motor of the homopolar design and having a housing, a shaft journaled in the housing, a rotor secured to the shaft, and a stator connected with the housing and concentrically surrounding the rotor with a working air gap therebetween, wherein the stator is a layered steel structure with a plurality of radially inwardly extending poles for the respective field windings and each of the stator poles is provided on the end face thereof at the working air gap with a plurality of stator pole teeth at a uniform pitch, insulation means is provided for covering the stator poles so as to isolate the field windings electrically therefrom, the rotor includes an axially magnetized permanent magnet and two magnetically conductive annular steel members sandwiching the magnet therebetween and provided on their circumferential faces at the working air gap with respective identical sets of rotor teeth at a uniform pitch but with the rotor teeth on each annular member offset by a half pitch with respect to the rotor teeth on the other annular member, the shaft is magnetically non-conductive, and the housing includes a pair of magnetically non-conductive bearing bells;
Dependencies are inferred from the claim text.