Electrical generator or motor structure – Dynamoelectric – Oscillating
Patent
1974-09-23
1976-04-20
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Oscillating
310115, 310116, 350 6, 178 76, 335230, H02K 3312
Patent
active
039522172
ABSTRACT:
A drive system for causing a relatively massive scanning element, such as a mirror, to rotate back and forth about a scan axis, with minimum disturbance of the space vehicle which carries it, includes a counterbalance which oscillates about an axis parallel to axis of the element in the opposite direction and 180.degree. out of phase so that the net angular momentum of the system is zero. One or more buffer springs attached to the element encounter limit stops on the counterbalance, or vice versa, at the ends of the scan to stop and reverse the motions of both the element and counterbalance without reaction on the supporting members. For a given rate of scan, the energy of the system remains substantially constant but changes twice per cycle from kinetic energy during the coasting period (i.e., between contacts with the springs) to potential energy stored in the springs during reversal. Proper attention to the design of the bearings and of the springs and stops ensures minimum loss of energy. An electromagnetic torque motor is provided to drive the mirror, and react on the counterbalance, to make up energy losses as required and to initiate the oscillation. A second torque motor may be provided to drive the counterbalance and react on the supporting structure to change the mean anglular position of the mirror with respect to the support.
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patent: 3642344 (1972-02-01), Corker
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patent: 3678308 (1972-07-01), Howe
patent: 3847466 (1974-11-01), Forse
Conant J. K.
Duggan Donovan F.
Giarratana S. A.
Masselle F. L.
The Perkin-Elmer Corporation
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