Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-05-21
1982-04-27
Miller, J. D.
Electrical generator or motor structure
Dynamoelectric
Rotary
310112, H02K 3700
Patent
active
043272991
ABSTRACT:
A stepping motor having a first and a coaxially disposed second annular stator section, which stator sections are axially spaced by a coaxially disposed permanent-magnetic ring. Each stator section terminates on the inner side in two coaxially disposed annular systems of teeth. The systems of teeth of each stator section have been mutually shifted nominally by 1/2 tooth pitch relative to the rotor toothing and the systems of teeth situated on the outer side relative to the permanent-magnetic ring as well as the systems of teeth situated on the inner side relative to the permanent-magnetic ring exhibit a mutual shift relative to the rotor toothing of nominal 1/4 tooth pitch. In this stepping motor stepping-angle errors can be nearly eliminated for a specific energization by selecting the teeth geometries in such a way that the amplitude of the permeances of the air gap between the inner systems of stator teeth and the cooperating rotor toothing as a function of the rotor position is smaller than the amplitude of the permeance of the air gap between the outer systems of stator teeth and the cooperating rotor toothing as a function of the rotor position.
REFERENCES:
patent: 3549918 (1969-05-01), Groymans
patent: 3671841 (1972-06-01), Hoffman
patent: 4206374 (1980-06-01), Goddijn
Miller J. D.
Rebsch D. L.
Smith Robert S.
U.S. Philips Corporation
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