LINEAR POSITION DETECTING DEVICE

• Main Authors: ICHIKAWA WATARU, MATSUKI YUUJI
• Format: Patent
• Language: English
• Published: 31.08.1985
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TARIFF METERING APPARATUS; TESTING; TRANSPORTING; VEHICLE SUSPENSION ARRANGEMENTS; VEHICLES IN GENERAL; WEAPONS

PURPOSE:To detect a linear position with high accuracy by detecting a position based on a linear relative displacement position of a rod constituted of a magnetic material part and a good conductive material part, and a detecting coil, through an eddy current generated in the detecting coil. CONSTITUTION:An A phase primary coil and a secondary coil 1A, 2A, and a C phase primary coil and a secondary coil 1C, 2C are contained in a cylindrical magnetic case 4, and in a similar magnetic case 5 separated by a prescribed distance, similar coils 1B and 2B, and 1D and 2D of a B phase and a D phase are contained. In this state, an eddy current corresponding to a linear relative displacement position to a round bar-shaped rod 6 is detected through the coils 2A-2D. This rod 6 is formed by a magnetic material part 6a and an electric conductor part 6b having good conductivity, and by a geometric eddy current by both the parts 6a, 6b, the eddy current detected by the coils 2A-2D becomes large, and the linear relative displacement is detected with high accuracy.