Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-08-21
1982-12-28
Miller, J. D.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68R, 318318, 324174, H02K 122, H02K 1100, H02K 1604
Patent
active
043664059
ABSTRACT:
A tachogenerator mounted on the underside of a brushless d.c. motor having an external permanent magnet rotor 11 and ironless stator coils affixed to a return magnetic path plate has a first winding surrounded by a first magnetic circuit for producing an alternating voltage of a frequency dependent upon speed of rotation and a second winding for compensation of the effect of the alternating stray flux penetrating through the tachogenerator, the compensation being provided by superposing the output voltage of the second winding on the output voltage of the first winding. The second winding is arranged in a second magnetic circuit, such that upon revolution of the rotor, useful alternating flux is generated which is synchronous with that generated by the first magnetic circuit, but which is spatially in phase opposition thereto. A common rotor and a common source of magnetomotive force, such as a permanent magnet, are provided for both magnetic circuits, the magnet being an annular magnet with a large number of poles of alternating polarity, which cooperates with a toothed element of which the alternating recesses and projections are the same in number as the alternating poles of the magnet. The configuration is such that with relative movement, one part of the useful alternating magnetic flux generated flows around the winding of the first magnetic circuit in one sense, and another part of the same useful magnetic flux flows around the winding of the second magnetic circuit in the opposite sense. The ring magnet is preferably stationary and the toothed element is constituted by the outer portion of the rotor which revolves just inside the ring magnet. The second return path member carries at its center a bearing for the common shaft of the tachogenerator and the d.c. motor.
REFERENCES:
patent: 3504320 (1970-03-01), Engdahl et al.
patent: 3723862 (1973-03-01), Wentzel et al.
patent: 3816776 (1974-06-01), Chari
patent: 3967200 (1976-06-01), Tetsugu et al.
patent: 3984713 (1976-10-01), Presley
patent: 4045738 (1977-08-01), Buzzell
patent: 4174484 (1979-11-01), Schmider
patent: 4260914 (1981-04-01), Hetrich
Miller J. D.
Papst Motoren KG
Rebsch D. L.
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