Matsayin nan ne LVDT?

LVDT tana da nufin?

Takaitaccen LVDT

LVDT ko Linear Variable Differential Transformer, yana cikin hukuma na inductive wanda ke haɗa hakkin line mai girma zuwa siffar mutanen. Yana da muhimmanci saboda tsari da kula da shi.Siffar da aka samu daga secondary ta wannan transformer ita ce differential, saboda haka ana kiran shi. Shi ne inductive transducer da ya fi yawa saboda tsarin da kula da shi a matsayin mafi inganci a cikin wasu inductive transducers.

Kudancin LVDT

Muhimman Nau'o'in Kudancin

• Transformer ya kunshi primary winding P da biyu secondary windings S1 da S2 da ake karfi a cylindrical former (wanda yana da hole da ke da core).

• Duka biyu secondary windings suna da adadin turns masu gaba, da ake sauran su a karkashin primary winding

• Primary winding an kofara da AC source wanda ke bayyana flux a air gap da kuma voltages an fito a secondary windings.

• A kan former an koyar soft iron core da za a canza, da displacement da za a canza a cikin iron core.

• Iron core yana da high permeability wanda ke taimaka wajen rage harmonics da kuma high sensitivity of LVDT.

• LVDT an koyar a stainless steel housing saboda zai ba electrostatic da electromagnetic shielding.

• Duka biyu secondary windings an kofara hakan da fadada akan voltages of two windings.

Principle of Operation and Working

Saboda primary an kofara da AC source, akwai alternating current da voltages an fito a secondary of the LVDT. Fadada a secondary S1 ita ce e1 da a S2 ita ce e2. Saboda haka, differential output ita ce,

Wannan equation ita ce take bayyana principle of Operation of LVDT.

Yanzu, akwai uku wurare da za a bayyana working of LVDT a cikin locations of core, masu:

• CASE I Idan core ya kasance a null position (for no displacement).Idan core ya kasance a null position, flux linking with both the secondary windings ita ce equal, saboda haka, induced emf ita ce equal in both the windings. Saboda haka, for no displacement, fadada eout ita ce zero saboda e1 da e2 suna da gaba. Saboda haka, yana nuna cewa ba displacement ba ya faru.

• CASE II Idan core ya yi canza a upward of null position (For displacement to the upward of reference point)

• A cikin wannan case, flux linking with secondary winding S1 ita ce more as compared to flux linking with S2. Saboda haka, e1 ita ce more as that of e2. Saboda haka, output voltage eout ita ce positive.

• CASE III Idan core ya yi canza a downward of Null position (for displacement to the downward of the reference point). A cikin wannan case, magnitude of e2 ita ce more as that of e1. Saboda haka, output eout ita ce negative and shows the output to downward of the reference point.

Output VS Core Displacement

Fadada voltage of an LVDT displays a linear relationship with the core’s displacement, as represented by a linear curve on a graph.Some important points about magnitude and sign of voltage induced in LVDT

The amount of change in voltage either negative or positive is proportional to the amount of movement of core and indicates amount of linear motion.By noting the output voltage increasing or decreasing the direction of motion can be determinedThe output voltage of an LVDT is linear function of core displacement .

Advantages of LVDT

• High Range – LVDTs can measure a wide range of displacements, from as little as 1.25 mm up to 250 mm, which enhances their versatility in various applications.

• No Frictional Losses – As the core moves inside a hollow former so there is no loss of displacement input as frictional loss so it makes LVDT as very accurate device.

• High Input and High Sensitivity – The output of LVDT is so high that it doesn’t need any amplification. The transducer posseses a high sensitivity which is typically about 40V/mm.

• Low Hysteresis – LVDTs show a low hysteresis and hence repeatability is excellent under all conditions

• Low Power Consumption – The power is about 1W which is very as compared to other transducers.

• Direct Conversion to Electrical Signals – They convert the linear displacement to electrical voltage which are easy to process

Disadvantages of LVDT

• Due to their sensitivity to stray magnetic fields, LVDTs require protective setups to ensure accurate performance and prevent interference.

• LVDT gets affected by vibrations and temperature.

• It is concluded that they are advantageous as compared than any other inductive transducer.

Applications of LVDT

• We use LVDT in the applications where displacements to be measured are ranging from a fraction of mm to few cms. The LVDT acting as a primary transducer converts the displacement to electrical signal directly.

• The LVDT can also act as a secondary transducer. E.g. the Bourbon tube which acts as a primary transducer and it converts pressure into linear displacement and then LVDT coverts this displacement into an electrical signal which after calibration gives the readings of the pressure of fluid.