Apparatus for positioning a rotating element

Details Apparatus for positioning a rotating element Apparatus for positioning a rotating element

1986-10-09

1987-11-10

Dobeck, Benjamin

Electricity: motive power systems

Having rotor element biased against rotation

By resilient biasing means

318600, 318640, 250237G, G05B 106

Patent

active

047059966

ABSTRACT:
The position of a rotating element is controlled by a galvanometer and a servo system. The position of the rotating element is determined by using a two-grating moire pattern. Movement of the element causes a projected scale image representing radiation reflected from the element to shift relative to a fixed grating thereby generating moire fringes. The accumulated fringes serve to measure absolute position and motion of the element. The servo digitally processes the measured position to generate several force components which are then combined to control the amount of force applied by the galvanometer to rotate the element.

REFERENCES:
patent: 3922603 (1975-11-01), Lesur
patent: 3956682 (1976-05-01), Van Dyck
patent: 4180774 (1979-12-01), Odone et al.
patent: 4236105 (1980-11-01), Wilkinson
patent: 4655587 (1987-04-01), Wijhtjes

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