What is LVDT sensor (Linear Variable Differential Transformer)

understanding:

as the name suggests a linear means straight linear motion, the sensor function to read the movement of the straight line, in a linear fashion.

LVDTTerdiri from:

     * moving iron core
     * Primary Coil
     * A pair of secondary coils

Primary coil

connect to the AC voltage as reference voltage

Secondary coil
Amounted to 2 pieces, located on the left and right primary coils are connected in series with one another.

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Core centered
Flux S1 = S2
voltage induction E1 = E2
Energy = 0

core move to S1 then:
Flux S1 > S2
tegangan induksi E1 > E2,
Energy = E1 - E2

core move to S2 then:
Flux S1 < S2
voltage induction E1 < E2
Energy = E2 – E1
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Parameter Formulas
The voltage generated at the secondary is proportional to the change in position of magnetic core

vo = ve K x
linear relationship when the core is still around the equilibrium position
SCHEME AND FIGURE LVDT---

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LVDT in IC

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Sensor Application Examples

Sensors (displacement, distance, and other mechanical sensors)

     * Fluid Level
     * Automotive Suspension
     * ATM Machines

Advantages and Disadvantages

Excess

     * Without the friction between the iron core transformers
     * Resolution infinite
     * Reliable and durable
     * Can be applied in varying environments
     * Output the absolute (absolute)

weakness

     * relatively expensive price

download file ppt

position.ppt

Fraden, Jacob. 2003. Modern Sensor. San Diego: Advance Monitor Corporation


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