Synchronous micromotor

Details Synchronous micromotor Synchronous micromotor

1975-11-25

1977-10-04

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310154, H02K 2114

Patent

active

040526305

ABSTRACT:
A synchronous micromotor having a central rotor shaft coaxially surrounded by a permanent magnet structure including a plurality of north poles and a plurality of south poles which circumferentially alternate with the north poles, all of these poles being circumferentially distributed about the rotor shaft and directed outwardly away from the latter. The permanent magnet structure is in turn coaxially surrounded by a cylindrical wall structure which is in turn coaxially surrounded by an annular outer coil structure. The cylindrical wall structure is made of a soft magnetic material and has a pair of annular yoke portions surrounding the rotor shaft and spaced axially one from the other, the cylindrical wall structure having between the annular yoke portions thereof a plurality of elongated apertures each extending from one to the other of the yoke portions helically with respect to the axis of the rotor shaft.

REFERENCES:
patent: 2756357 (1956-07-01), Schaberg
patent: 3004181 (1961-10-01), Noddin
patent: 3319100 (1967-05-01), Erickson
patent: 3479539 (1969-11-01), Brion
patent: 3541410 (1970-11-01), Rothert
patent: 3904902 (1975-09-01), Inariba
patent: 3984709 (1976-10-01), Kuwako et al.

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