Patent Number: 6,426,635

Title: Galvanometer position detector

Abstract: A capacitive sensing system for detecting the angular position of a rotatable member of a motor. The position detection system includes a cylindrical excitation pin attached to the housing of the motor and a tubular signal plate, having a plurality of sensing surfaces symmetrically arranged about the axis of rotation of the rotatable member, which surrounds the cylindrical excitation pin and, which is also attached to the motor housing. A lobed dielectric is attached to the rotatable member of the motor and inserted between the cylindrical excitation pin and the tubular signal plate. An electric circuit connected to the sensing surfaces of the tubular signal plate calculates the relative angular position of the rotatable member from the amount of energy detected at each of the sensing surfaces.

Inventors: Nussbaum; Michael B. (Newton, MA)

Assignee: GSI Lumonics, Inc.

International Classification: G01D 5/24 (20060101); G01D 5/12 (20060101); G01R 027/26 (); G08C 019/10 ()

Expiration Date: 07/30/2010