Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-02-20
1982-05-11
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
318696, 368 76, H02K 3700
Patent
active
043296017
ABSTRACT:
A single phase bipolar stepping motor is described wherein the rotor is cble of bidirectional rotation. The rotor is so dimensioned that a combination of its moment of inertia J, its volume V and the number of pole pairs p satisfy the relation J/(V.multidot.p.sup.1,4).gtoreq.5.multidot.10.sup.-3 kg/m. Such a rotor will reliably step in the sense opposite to the preferred sense when the motor winding receives a first pulse of short duration followed by a second pulse of longer duration the polarity of which is inverted relative to that of the first pulse. The invention may find application to timepieces having hours and minutes hands.
REFERENCES:
patent: 3596119 (1971-07-01), Goldmann
patent: 3597915 (1971-08-01), Aizawa et al.
patent: 3979616 (1976-09-01), Stechmann
patent: 3991332 (1976-11-01), Kawamura et al.
patent: 4048548 (1977-09-01), Nakajima et al.
patent: 4055785 (1977-10-01), Nakajima et al.
patent: 4066947 (1978-01-01), Nakajima et al.
Duggan Donovan F.
Societe Suisse pour l'Industrie Horlogere Management Services S.
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