Variable transformer to detect linear displacement with constant

Details Variable transformer to detect linear displacement with constant Variable transformer to detect linear displacement with constant

1990-02-16

1991-10-29

Wieder, Kenneth

Electricity: measuring and testing

Magnetic

Displacement

32420724, 324233, 336136, 336180, 336224, 34087036, G01B 714, H01F 2106, H01F 2728

Patent

active

050618962

ABSTRACT:
A variable transformer is disclosed. The transducer includes a uniform pitch winding wound on a hollow bobbin with several continuously variable concentric coils wound over it with layers of insulation in between. The variable coils are wound in accordance with true trigonometric functions by adjusting the pitch between adjacent turns and reversing the direction of winding at each maximum pitch point corresponding to the zero crossover. The variable pitch coils are physically wound in quadrature with respect to a reference point on the bobbin. The transducer is finished by placing a magnetic shield over the bobbin which may include magnetic end washers. Lead wire connections are made and the entire unit is placed in a suitable housing. A moveable core, made from a highly permeable material, is placed inside the unit for slidably engaging the bobbin in its hollow. The variable pitch coils may then be excited by separate trigonometric function generators operating in quadrature and the output signal from the secondary has a constant amplitude which changes in phase with respect to one of the excitation sources in direct proportion to the position of the moveable magnetic core. Alternatively, the uniform pitch coil may be excited by a single phase AC source and the amplitude of the output signals from the variable pitch coils in conjunction with their phase relationship to the AC excitation source will indicate displacement of the core.

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"LPDT Preliminary Design Review" Cadillac Gage, May 22, 1985.
Yeaple, "Linear Position Transducer Changes Phase Instead of Amplitude", Design News, Nov. 5, 1984, pp. 180-181.

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