Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1976-07-23
1979-11-13
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310268, H02K 1100
Patent
active
041744845
ABSTRACT:
A cup-shaped shell with a re-entrant bearing member surrounds the rotor on the bottom side and has a rim which is substantially flush with the top of the rotor. On a balcony or shoulder in the outer portion of the shell, the coils of an iron-less stator winding are affixed by means of an adhesive so that they extend self-supportingly inwards into an air gap between two parts of the rotor that are spaced by a separator piece resisting the magnetic forces tending to attract the two parts of the rotor to each other, which member is mounted on the rotor shaft and surrounds, with an intermediate clearance, the re-entrant bushing of the casing. The casing has a downward tubular extension below its floor which together with a cap forms a chamber for a tachogenerator utilizing a toothed disk and a multi-pole rubber magnet for speed control of the motor in connection with a pair of Hall effect generators located between two of the stator coils of the motor and a transistor circuit for operating the motor as a brushless d.c. motor.
REFERENCES:
patent: 2428781 (1947-10-01), Bowlus
patent: 3189770 (1965-06-01), Henry-Baudot
patent: 3324321 (1967-06-01), Kober
patent: 3482131 (1969-12-01), Lytle
patent: 3845339 (1974-10-01), Merkle et al.
patent: 3953751 (1976-04-01), Merkle et al.
patent: 4007390 (1977-02-01), Muller et al.
Duggan Donovan F.
Papst-Motoren KG
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