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Google Patents Inductive angle sensor of the synchro resolver typeÄownload PDF Info Publication number EP1351372A1 EP1351372A1 EP20030290613 EP03290613A EP1351372A1 EP 1351372 A1 EP1351372 A1 EP 1351372A1 EP 20030290613 EP20030290613 EP 20030290613 EP 03290613 A EP03290613 A EP 03290613A EP 1351372 A1 EP1351372 A1 EP 1351372A1 Authority EP European Patent Office Prior art keywords rotor sensor stator armature windings Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents EP1351372A1 - Inductive angle sensor of the synchro resolver type The principle is same but resolvers have 4 secondary windings instead of 3.EP1351372A1 - Inductive angle sensor of the synchro resolver type The coupling of the primary and secondary windings of the transformer varies as the rotor is turned, enabling the angle to be determined by applying an excitation current to the primary coil and reading back the relative magnitudes of the secondary currents. Synchros are a type of transformer often used to measure the angle of a rotating machine. When energized with a fixed AC source, the output signal is linear within a specified range over the angular displacement. Rotational variable differential transformers (RVDT) are electromechanical transducer sensors providing a variable AC output voltage that is linearly proportional to the angular displacement of its input shaft. LVDTs are commonly used for position feedback in servomechanisms, and for automated measurement in machine tools and many other industrial and scientific applications. Driven by an AC excitation source, the LVDT generates a pair of AC output signals that are modulated according to the mechanical position (displacement) of the core. Linear variable differential transformers (LVDT) are electrical transformer sensors to measure linear displacement. To read the sensor measurement data, and also to test potentially damaging or dangerous operational limits and test fault conditions, the I/O modules include a mix of both measurement channels and stimulus outputs. Speedgoat offers support for measuring and simulation of LVDT, RVDT, Synchro and Resolver sensor signals with dedicated I/O modules.