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Questions and Answers
LVDT is a type of transformer.
LVDT is a type of transformer.
False (B)
LVDT is a type of inductive transducer.
LVDT is a type of inductive transducer.
True (A)
LVDT contains electronic components inside it.
LVDT contains electronic components inside it.
False (B)
LVDT measures physical quantities directly without the need for a primary transducer.
LVDT measures physical quantities directly without the need for a primary transducer.
LVDT consists of a primary coil wound over the whole length of a ferromagnetic cylinder.
LVDT consists of a primary coil wound over the whole length of a ferromagnetic cylinder.
LVDT's electrical output is obtained due to the difference in primary voltages.
LVDT's electrical output is obtained due to the difference in primary voltages.
The primary winding is connected to a DC source, not an AC source.
The primary winding is connected to a DC source, not an AC source.
The iron core inside the former is generally of low permeability.
The iron core inside the former is generally of low permeability.
The LVDT is placed inside an aluminum housing for electrostatic and electromagnetic shielding.
The LVDT is placed inside an aluminum housing for electrostatic and electromagnetic shielding.
The amplitude of the differential output voltage (Va-Vb) is not proportional to the core position.
The amplitude of the differential output voltage (Va-Vb) is not proportional to the core position.
The phase shift of (Va-Vb) with reference to the excitation determines the direction towards the zero position.
The phase shift of (Va-Vb) with reference to the excitation determines the direction towards the zero position.
The null position is defined as the core position where the phase shift of the (Va-Vb) differential output is 180 degrees.
The null position is defined as the core position where the phase shift of the (Va-Vb) differential output is 180 degrees.
The differential output between the two secondary outputs (Va-Vb) when the core is at null position is called the Null Voltage.
The differential output between the two secondary outputs (Va-Vb) when the core is at null position is called the Null Voltage.
The residual voltage, known as quadrature voltage, is high due to the simple nature of the LVDT electrical model.
The residual voltage, known as quadrature voltage, is high due to the simple nature of the LVDT electrical model.
AC excitation of 20-25 Volts at a frequency of 40-350Hz is applied to the primary winding.
AC excitation of 20-25 Volts at a frequency of 40-350Hz is applied to the primary winding.
The working principle of LVDT is based on Faraday's law of electromagnetic induction.
The working principle of LVDT is based on Faraday's law of electromagnetic induction.
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Study Notes
LVDT Overview
- LVDT stands for Linear Variable Differential Transformer, a type of transformer and inductive transducer.
- Functions as a direct measurement device for physical quantities without requiring a primary transducer.
Construction and Components
- Features a primary coil that wraps around the length of a ferromagnetic cylinder.
- Contains electronic components for its operation.
- Housed in aluminum for protection against electrostatic and electromagnetic interference.
Operation Principles
- Operates using DC excitation rather than AC, which is connected to the primary winding.
- The core typically has low permeability, affecting the magnetic field interaction.
- Voltage output arises from the differential in primary voltages due to core position changes.
Output Characteristics
- The amplitude of the differential output voltage (Va - Vb) does not accurately represent core position.
- The phase shift of the output voltage (Va - Vb) relative to the excitation signal indicates the direction of movement toward the null position.
- Null position is defined where the phase shift between (Va - Vb) is 180 degrees.
Key Measurements
- At the null position, the output difference (Va - Vb) is termed Null Voltage.
- Quadrature voltage refers to the residual voltage at the null position and can be significant due to the LVDT's basic electrical design.
Excitation and Operating Conditions
- AC excitation voltage of 20-25 Volts, at frequencies between 40-350 Hz, is applied to the primary winding during operation.
- The working principle is anchored in Faraday's law of electromagnetic induction, highlighting the transformer’s reliance on electromagnetic principles.
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