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Browse Prior Art Database

Simple Feedback System for Controlling the Motion of Rotary Actuators

IP.com Disclosure Number: IPCOM000122787D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Lebeck, B: AUTHOR [+2]

Abstract

There are many optical instruments to control the position of rotary actuators, but they are generally too costly and complicated. Using all effect sensors, the actuator position can be accurately and easily controlled to a precision of at least 25 um and better that 1 um with some care.

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Simple Feedback System for Controlling the Motion of Rotary Actuators

      There are many optical instruments to control the
position of rotary actuators, but they are generally too costly and
complicated.  Using  all effect sensors, the actuator position can be
accurately and easily controlled to a precision of at least 25 um and
better that 1 um with some care.

      All effect sensor and magnets are used to determine the angular
position of a rotary actuator.  The  all effect sensor is fixed to
the non-moving part of a rotary actuator assembly.  For a large range
of motion, two magnets are mounted on aluminum bars attached to the
rotational axis of the actuator, one on each side of the  all
sensor.  The poles of the magnets are positioned to face each other,
giving linear output as a function of angular position.  For high
position sensitivity, one magnet is used and the all sensor is
mounted as near to the magnet as possible.  The frequency response of
the all sensor is satisfactory from DC to 23k z.
  Reference
  (*) Allegro Microsystems, Inc., "Integrated and Discrete
       Semiconductors Data Book" (1993).