DIFFERENTIAL TRANSFORMER TYPE DISPLACEMENT SENSOR

摘要

PROBLEM TO BE SOLVED: To provide a differential transformer type displacement sensor 1B miniaturizable while ensuring a displacement output having linearity. SOLUTION: The respective lengths (lengths in the moving direction of a magnetic core 3A) of a first coil 2a and second coil 2b constituting a secondary coil 2 by partially overlapping and winding the both near the center of a primary coil 4 in the radial direction are set long. Namely, the whole length L2 of the secondary coil 2 can be set short by the portion of the overlap winding length. The whole length LCb of the magnetic core 3A itself in the moving direction thereof is set to a length between 0.8 times and 1.5 times the whole length of the primary coil 4 in the moving direction of the magnetic core 3A. According to such a structure, requirements for both the prevention of the deterioration of noise resistance by reduction in EV output sensitivity (displacement output to the moving quantity of the magnetic core 3A) and the improvement in linearity of displacement output of the magnetic core 3A can be satisfied, and the sensor can be miniaturized.