5.1.3 d. Linear Variable Differential Transformers (LVDT)

5.1.3 Explain the position sensors

d. Linear Variable Differential Transformers (LVDT)

•  An LVDT consists of a magnetic core that moves in a cylinder
• The sleeve of the cylinder contains a primary coil that is driven by an oscillating voltage
• Thesleeve also contains two secondary coils that detec this oscillating voltage with a displacement
• The automatic nulling that can be achieved using two coils makes LVDTs very accurate. (submilimeter)

SPRING LOADED LVDT FOR HYDRAULIC CYLINDERS

FREE CORE LVDT FOR HARSH ENVIRONMENTS AND TOTAL EMERSION APPLICATION

LVDT application

• High accuracy 
• Linear Operation (synchro resolver is equivalent rotary LVDT)
• Harsh Environment
• Analog position control
• Embedding (ex : in cylinder)

 
 
  

 VIDEO: DIY LVDT, CAN YOU CONSTRUCT THIS?? ONLY USING STRAW!