IMPROVED CARTRIDGE-TYPE LINEAR VARIABLE DIFFERENTIAL TRANSFORMER Page: 6 of 18
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AN IMPROVED CARTRIDGE TYPE LINEAR VARIABLE
A linear variable differential transformer was needed that would
operate reliably in the semicorrosive atmosphere sometimes encountered
in gloved boxes. Sufficient strength was required to resist clamping force
deformation to permit increased stability in making set-ups. It was also
necessary to have a free moving bearing providing linear movement of the
core in relation to the transformer coil with no lateral movement.
This report describes the design, development, fabrication and test
results of a transformer cartridge that meets these requirements.
It is believed that transformer cartridges built, using the basic
bearing design described, (with modifications to case and stroke dimensions
to suit various applications) would meet the needs for measuring linear dis-
placement to close tolerance.
Linear variable differential transformers have been used to measure
linear displacements in a variety of applications in gloved boxes for many
years. In some applications the sensing tip is subject to lateral forces that
affect the precision and sensitivity of the LVDT. Gloved box applications and
atmospheres have resulted in the need for frequent maintenance, complicated
by the necessity for performing such maintenance in the gloved box.
Based on an employee's suggestion idea, an improved linear variable
differential transformer (cartridge type) was designed, fabricated, tested, and
placed in service. The suggested idea and main feature of this transformer
cartridge is a preloaded ball, core shaft bearing, Figure 1. A working model
of this bearing arrangement was fabricated and tested for freedom of movement
4 Suggestion HWIR-1667 submitted by C. F. Setbacken, Instrument Technician
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Weihermiller, W.B. IMPROVED CARTRIDGE-TYPE LINEAR VARIABLE DIFFERENTIAL TRANSFORMER, report, January 1, 1965; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1031710/m1/6/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.