Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-02-05
1988-03-22
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
318696, H02K 3700
Patent
active
047331135
ABSTRACT:
A three-phase stepping motor having first, second, and third sets of stator poles, with the first and second sets of stator poles having single coils thereon and the third set having dual or bifilar coils thereon. The coils on the first set of stator poles and one of the coils on each pole of the third set of stator poles are connected to one phase of a two-phase drive. The coils on the second set of stator poles and the other of the coils on each pole of the third set of stator poles are connected to the other phase of a two-phase drive. The currents of the two drive phases are thus magnetically combined in the third set of stator poles to produce energization of the "third phase". In one embodiment, a twelve-pole, rotary, three-phase stepping motor with a 50-tooth rotor and a 48- , 50-, or 52-tooth-pitch stator produces a step angle of 1.8.degree. mechanical with a two-phase drive.
REFERENCES:
patent: 3117268 (1964-01-01), Madsen
patent: 3462667 (1969-08-01), Jackson
patent: 3473059 (1969-10-01), Levin et al.
patent: 3509392 (1970-04-01), Snowdon
patent: 3535604 (1970-10-01), Madsen et al.
patent: 3621312 (1971-11-01), Palmoro
patent: 3866104 (1975-02-01), Heine
patent: 4029977 (1977-06-01), Chai et al.
patent: 4100473 (1978-07-01), Lawrenson et al.
Crozier John H.
Duggan Donovan F.
The Superior Electric Company
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