Performance of Magnetostrictive Amorphous Wire Sensor in Motor Speed Measurement

Abstract

This paper presents the performance analysis of magnetostrictive amorphous wire in motor speed measurement. The principle of the operation of the sensor is based on Large Barkhausen Jump (LBJ), a unique feature of the wire. A dc motor is used due to the linear relationship between applied voltage and speed. The supply voltage of the dc motor is varied and motor speed measured. The frequency of the signal obtained from the magnetostrictive amorphous wire sensor is measured using an oscilloscope and the motor speed calculated from this frequency. Results obtained from amorphous wire sensor show quite good agreement with that of the digital tachometer.

Keywords:  Large Barkhausen Jump (LBJ), Magnetostrictive Amorphous Wire, Speed sensor