The linear variable differential transformer (LVDT) (also called just a differential transformer,is a type of electrical transormer used for measuring linear displacement (position). A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer (RVDT).
The linear variable differential transformer has three solenoid coils placed end-to-end around a tube. The center coil is the primary, and the two outer coils are the top and bottom secondaries. A cylindrical ferromagnetic core, attached to the object whose position is to be measured, slides along the axis of the tube. An A.C drives the primary and causes a voltage to be induced in each secondary proportional to the length of the core linking to the secondary.The frequency is usually in the range 1 to 10 khz.
The linear variable differential transformer has three solenoid coils placed end-to-end around a tube. The center coil is the primary, and the two outer coils are the top and bottom secondaries. A cylindrical ferromagnetic core, attached to the object whose position is to be measured, slides along the axis of the tube. An A.C drives the primary and causes a voltage to be induced in each secondary proportional to the length of the core linking to the secondary.The frequency is usually in the range 1 to 10 khz.
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