Sensors Linear Variable Differential Transformers (LVDT)

Tuesday, May 28th, 2013 - Sensors/Tranducer

Sensors Linear Variable Differential Transformers (LVDT) is a sensor that works on the principle of differential transformer with variable coupling between the variable coupling between the primary coil and secondary coil. This principle was first suggested by Schaevits in the 1940s.

In the present LVDT sensors have been widely diunakan. In its application the LVDT can be used as proximity sensors, angle sensors, and other mechanical sensors. For this time the sensor is applied as a proximity sensor.

An LVDT is basically composed of a primary coil, two secondary coils, and a core of ferromagnetic material. Coils are wrapped in a sleeve, while the iron core is placed inside the cavity of the sleeve. These casings are made of non-magnetic material. Primary coil wound around the middle shell, while the second secondary coil wound around each side of the primary coil. These two secondary coils are connected in series as opposed to the same number of loops.

Sensors Linear Variable Differential Transformers (LVDT)

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LVDT can be described schematically as shown above. In primary kuparan ujungujung given excitation voltage in the form of alternating voltage (AC). The output of the sensor is taken from the ends of the secondary coil.

Large output voltage depends on the position of the LVDT core. At the core position. At the middle position of the iron core, the emf induced by the secondary coil 1 and 2 at large. But because the two secondary coils connected in opposite series, the output voltage will be equal to zero. If we slide the iron core to the left then the secondary coil will have a meeting of the flux is higher than the secondary coil 2. Consequently induced emf in secondary coil 1 will be greater than the secondary coil 2. The resulting output voltage is the voltage difference between the two secondary coils.

The relationship between output and pergesaran tegagan LVDT core is linear at a certain distance interval. The relationship between the output voltage U x with an iron core linear position when the core at the center sleeve, and when the core is not linear in pinggirpinggir sleeve.

LVDT can be used to measure the shift / change in distance. For this purpose we connect the handle to the LVDT core to be measured movement.

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