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A METHOD OF ADJUSTING FULL SCALE RANGE AND INTERMEDIATE ACCURACY OF FULLY ASSEMBLED AIR CORE MOVEMENTS

IP.com Disclosure Number: IPCOM000005768D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-05
Document File: 1 page(s) / 75K

Publishing Venue

Motorola

Related People

Eugene L. Wineinger: AUTHOR

Abstract

Air core movements utilize a resultant vector from drive coils, to which a movable magnet on ashaft aligns. At any intended angular position of the rotating shaft, manufacturing tolerances result in a range of ratios for the drive coil magnetic vector magnitudes. This equates to a range of angular positions and thereby gives rise to the inaccuracy of intermediate (i.e. neither minimum nor maximum) shaft positions.

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M MOTOROLA Technical Developments Volume 9 August 1969

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A METHOD OF ADJUSTING FULL SCALE RANGE AND INTERMEDIATE ACCURACY OF FULLY ASSEMBLED AIR CORE MOVEMENTS

by Eugene L. Wineinger

   Air core movements utilize a resultant vector from drive coils, to which a movable magnet on ashaft aligns. At any intended angular position of the rotating shaft, manufacturing tolerances result in a range of ratios for the drive coil magnetic vector magnitudes. This equates to a range of angular positions and thereby gives rise to the inaccuracy of intermediate (i.e. neither minimum nor maximum) shaft positions.

   If the ratio of the vector magnitudes of the driven coils could be adjusted relative to each other, then there would be an increase of intermediate accuracy (i.e. obtaining the optimum ratio for that system design). The least improvement occurs when the vector magnitude ratio is very large or very small, and accuracy is aided most when the vector magnitude ratio is close to 1:l.

   Also, if the drive coils are not perfectly wound at the correct angle relative to each other, there are full scale range and intermediate errors due to this fact. If the coils could be magneticly aligned closer to their intended angle of separation, then these error factors would be decreased.

   A simple method of either changing the vector ratio or magneticly fine tuning the alignment of the coils relative to each other is to alter the magnetic path 1 (reluctance) of one coil 2 or more coils. This can be ac- complished after the air core movement has been fully assembled, and no matter how t...