Inductive transducer for converting the linear stroke movements of a sensor of mechanical measuring instruments into electrical measurement signals

摘要

For converting the linear stroke movements of a sensor of mechanical measuring instruments into electrical measurement signals, an inductive transducer is provided, the rod-shaped iron core 1 of which is connected to the sensor of the relevant measuring instrument and is axially carried inside two primary coils 2,3 arranged at a distance from one another. Furthermore, one or more coaxially arranged secondary coils 4,5 are provided and all coils are located in a return-path shell 6 of ferromagnetic material. The primary coils 2,3 fed with alternating voltage are polarised in opposite directions. To simplify the structure of the inductive transducer whilst maintaining high linearity, and to improve assembly and disassembly, the length b of the rod-shaped iron core 1 is greater than the sum of the axial distance a of the primary coils 2,3 and the maximum stroke length and the length c of the return-path shell 6 is greater than the sum of the length b of the iron core 1 and the maximum stroke length. The single-layer coils can be constructed as saddle coils and the return-path shell can have the form of two half shells. IMAGE