SENSOR DETECTING ROTATION NUMBER BY USING MAGNETIC DEFORMABLE MATERIAL AND PIEZOELECTRIC MATERIAL

摘要

PURPOSE: A sensor detecting the ROTATION NUMBER by using a magnetic deformable material and a piezoelectric material is provided to measure the rotation speed number at high temperature such as an engine of an automobile. CONSTITUTION: A sensor detecting the rotation number by using a magnetic deformable material and a piezoelectric material includes a magnet(10), a rotational number detector(20), a magnetic concentration unit(30) and an output unit(50). The magnet(10) changes the direction of the magnetic field in response to the rotation of the rotational object. The rotational number detector(20) is installed between the magnet(10) and the rotational object for changing the magnetic field passing therethrough and for converting the change into the electrical signal. The magnetic concentration unit(30) is installed between the rotational number detector(20) and the rotational object for guiding the passage of the magnetic field. And, the output unit(50) receives the electrical signal from the rotational number detector(20) and outputs the rotational number of the rotational object.