Displacement speed detection device

Abstract

Abstract PURPOSE:To detect a speed signal with a high level, by using a magnet as the core of the magnetic material of a differential transformer where the primary coil is energized by an AC. CONSTITUTION:A high frequency AC voltage 7 is applied to a primary coil 1 of a differential transformer 5. Counter electromotive forces are generated in secondary coils 2 and 3 of the differential transformer 5 by the movement of a magnet core 4 consisting of a ferromagnetic material which is displaced by a material to be measured, and these voltages are rectified synchronously in rectifiers 12 and 13 and are operated in a circuit 14 to take out a displacement voltage. Meanwhile, outputs of secondary coils 2 and 3 are subjected to subtraction in a circuit 17, and the result is allowed to pass through a low-pass filter 18, and a speed voltage signal of the core 4 is obtained. Thus, since a magnetic flux density is taken out with a large value because of the use of the magnet core, the S/N characteristics of the speed signal waveform are improved.

Inventors

• 👤 Yoshito Tanaka
• 👤 義人 田中
• 👤 Takeshi Ichiyanagi
• 👤 健 一柳

Bibliographic Details