Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-04-26
1991-05-07
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310113, 310 68R, 310171, 324173, H02K 1924, H02K 1100, H02K 2728, G01P 348
Patent
active
050139460
ABSTRACT:
A miniature motor with a frequency generator comprising a motor portion having a stator with a permanent magnet for forming a magnetic field and a rotor with rotor windings wound on a rotor core; electric current being fed to the rotor windings via a commutator making sliding contact with brushes, and a frequency generator for detecting the revolution of the motor, in which the frequency generator comprises a frequency generator rotor, mounted on the motor rotor, having a disc-like rotor portion made of a soft magnetic material and equipped with a plurality of magnetic-pole teeth on the outer periphery thereof, an internal-gear core of an annular disc shape, made of a soft magnetic material, disposed in such a manner as to come in contact with the inside of a motor housing and face the outer circumferential surface of the rotor portion and equipped with a plurality of magnetic-pole teeth on the inner periphery thereof, a permanent magnet forming a magnetic field between the magnetic-pole teeth of the rotor portion and the magnetic-pole teeth of the inner-gear core, and a frequency generator stator having frequency-detecting coils which detect changes in magnetic flux in a magnetic circuit in which the magnetic fluxes caused by the permanent magnet pass, and generate an induced voltage proportional to the revolution of the rotor portion.
REFERENCES:
patent: 3739211 (1973-06-01), Hasler
patent: 3967200 (1976-06-01), Tetsugu et al.
patent: 4237394 (1980-12-01), Aoki
patent: 4259603 (1981-03-01), Uchiyama et al.
patent: 4385249 (1983-05-01), Fukushima
patent: 4501983 (1985-02-01), Schmider
patent: 4829254 (1989-05-01), Baines
LaBalle C.
Mabuchi Motor Co. Ltd.
Stephan Steven L.
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