Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-07-24
1983-07-19
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310156, 310268, 318254, H02K 1100
Patent
active
043945945
ABSTRACT:
Slow-running brushless d.c. motors with a disk rotor, a flat air gap and an iron-free stator winding made up of a number of coils are particularly suitable for direct drive of sound recording and reproducing equipment at a highly steady and controlled speed. The iron-free coils are arranged in a one-layer winding arrangement connected to form a plurality of phase windings, each comprising a pair of magnetically oppositely poled coils and rotor position sensing means, such as a Hall generator, are provided for controlling the currents in the phase winding so as to obtain four-current pulses per rotor rotation angle of 360 electrical degrees and to set up a rotary magnetic field driving the permanent magnet rotor. Two sets of coils are shown in the stator winding, each set comprising at least one pair electrically connected with each other and oppositely poled and spaced from each other by (2n+1).multidot.180 electrical degrees, where n is a low positive integer. Double wound coils are shown with the two wires of the coils of a set being wound bifilarly and connected to form two-phase windings per set, with the width of the individual coils substantially greater than 180 electrical degrees. Embodiments illustrated show the disposition of coils and sensors for various cases in which the rotor has from three to seven pairs of poles.
REFERENCES:
patent: 2296754 (1941-09-01), Wolf et al.
patent: 2428781 (1947-10-01), Bowlus
patent: 2890438 (1959-06-01), Bardeen
patent: 3189770 (1965-06-01), Henry-Baudot
patent: 3324321 (1967-06-01), Kober
patent: 3470399 (1969-09-01), Johnson et al.
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.
patent: 4174484 (1979-11-01), Schnider
Muller Rolf
Schmider Fritz
Duggan Donovan F.
Papst-Motoren KG
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