H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/58
H02K 37/00 (2006.01) H02K 1/12 (2006.01) H02K 1/22 (2006.01) H02K 21/38 (2006.01) H02K 37/20 (2006.01)
Patent
CA 1135760
20.2.1980 1 PHN 9493 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 greatly be eliminated for a specific energisation 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 ampli- tude 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.
354171
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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