Electricity: measuring and testing – Magnetic – Displacement
Patent
1989-04-07
1991-11-19
Wieder, Kenneth A.
Electricity: measuring and testing
Magnetic
Displacement
32420712, 324225, G01B 714
Patent
active
050669117
ABSTRACT:
A transformer and method for sensing displacement, A linear variable displacement transformer (LVDT) 50, 100, 150, 200, and 250) is disclosed with respect to several embodiment,s each including a core (52, 102, 152, 202, and 252) having a primary leg (56, 104, 154, 204, and 254), and two secondary legs (58 and 60, 106 and 108, 158 and 160, 206 and 208, and 258 and 260). A primary coil (54, 110, 156, 210, and 264) is disposed on the primary leg, and secondary coils (62 and 64, 112 and 114, 162 and 164, 212 and 214, and 266 and 268) are disposed on the secondary legs. Pole pieces (70 and 72, 120 and 122, 170 and 172, 222 and 224, and 274 and 276) are disposed in gaps between the primary leg and each secondary leg, so that they control the reluctance to a magnetic flux produced by an electric current flowing thorugh the primary coil. Displacement of the two pole pieces within the gaps separating facing surfaces of the primary and secondary legs changes the proportion of the magnetic flux through each of the secondary legs and thus varies an electrical signal induced in each of the secondary coils. A differential between the electrical signals thus corresponds to the differential displacement of the pole pieces in each of the embodiments.
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Edmonds W. S.
Sundstrand Data Control Inc.
Wieder Kenneth A.
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