Temperature compensated differential transformer and a measuring

Details Temperature compensated differential transformer and a measuring Temperature compensated differential transformer and a measuring

1996-10-16

1998-08-04

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

335511, 33556, 32420712, 336136, 336179, G01B 700, G01B 508, H01F 2106, H01F 2728

Patent

active

057899185

ABSTRACT:
A differential transformer includes a primary coil for excitation and first and second secondary coils for detection which can be wound up on an outer surface of a bobbin made of a non-magnetic substance. In the bobbin, i.e., in a differential coil composed of the primary coil and the first and second secondary coils, a core is movably inserted in an axial direction thereof and is made of a magnetic substance. In the differential transformer, when AC current is applied on the primary coil, an induced voltage corresponding to a relative displacement between the core and the differential coil is generated, so that a size of a measured member can be measured by detecting the induced voltage. In the first and second secondary coils, a compound conducting wire is used, which includes two conducting wires which are different from each other in forms of a thermal coefficient of resistivity and are connected by a predetermined rate with regard to their length. Therefore, it is provided that the differential transformer can obtain a detection value corresponding to the relative displacement between the core and the differential coil regardless of a change of the ambient temperature.

REFERENCES:
patent: 3308411 (1967-03-01), Roshala
patent: 3688187 (1972-08-01), Loos
patent: 3694785 (1972-09-01), Chass
patent: 3846916 (1974-11-01), Moriya et al.
patent: 4205217 (1980-05-01), Araya et al.
patent: 5032785 (1991-07-01), Mathis et al.

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