Accurate Measurements of the Rotational Velocities of Brushless Direct Current-Motors by Using an Ultrasensitive Magnetoimpedance Sensing System.

Tao Wang,Yufeng Luo,Jinjun Rao,Hengyu Li,Zhizheng Wu,Bicong Wang,Mei Liu

doi:10.3390/mi10120859

Abstract

Reports on measurements of the rotational velocity by using giant magnetoimpedance (GMI) sensors are rarely seen. In this study, a rotational-velocity sensing system based on GMI effect was established to measure rotational velocities of brushless direct-current motors. Square waves and sawtooth waves were observed due to the rotation of the shaft. We also found that the square waves gradually became sawtooth waves with increasing the measurement distance and rotational velocity. The GMI-based rotational-velocity measurement results (1000–4300 r/min) were further confirmed using the Hall sensor. This GMI sensor is capable of measuring ultrahigh rotational velocity of 84,000 r/min with a large voltage response of 5 V, even when setting a large measurement distance of 9 cm. Accordingly, the GMI sensor is very useful for sensitive measurements of high rotational velocity.

Highlights

Over the past few decades, a series of sensors have been developed for measurements of rotational velocity including Magnetooptical sensors [1,2], Electrostatic sensors [3,4], Magnetoresistance sensors [5–9], etc. [10–17]
To explore the applications of giant magnetoimpedance (GMI) sensors in the field of rotational velocity measurements, a rotational velocity sensing system based on the GMI effect was established to measuring high rotational velocity of two low-power brushless motors in this work
The rotational-velocity sensing system consists of a GMI sensor, a brushless direct-current (DC) motor I (57BL55S06-230TF9, 24 V, 3.3 A, a rated rotational-velocity of 3000 r/min and a rated power of 60 W, Beijing Times-Chaoqun Electronic Appliance Company, Beijing, China), a tunable DC power supply (0–20 V), a brushless DC controller (ZM-6405E, 24 V, Beijing Times-Chaoqun Electronic Appliance Company, Beijing, China), a switching mode power supply

Summary

Introduction

Over the past few decades, a series of sensors have been developed for measurements of rotational velocity including Magnetooptical sensors [1,2], Electrostatic sensors [3,4], Magnetoresistance sensors [5–9], etc. [10–17]. Over the past few decades, a series of sensors have been developed for measurements of rotational velocity including Magnetooptical sensors [1,2], Electrostatic sensors [3,4], Magnetoresistance sensors [5–9], etc. These conventional magnetic sensors generally have some weaknesses of temperature drift, slow response, low sensitivity, and resolution, which limit their applications in high rotational-velocity measurements under extreme conditions. Giant magnetoimpedance (GMI) sensors have great potential for rotational velocity measurements due to their high sensitivity [18–25]. There have been few reports on GMI-based rotational-velocity measurements. To explore the applications of GMI sensors in the field of rotational velocity measurements, a rotational velocity sensing system based on the GMI effect was established to measuring high rotational velocity of two low-power brushless motors in this work

Experimental Details

Results and Discussion

CCoonnccllusions