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

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 859 ◽  
Author(s):  
Tao Wang ◽  
Bicong Wang ◽  
Yufeng Luo ◽  
Hengyu Li ◽  
Jinjun Rao ◽  
...  
Keyword(s):  
Direct Current ◽  
Velocity Measurement ◽  
Rotational Velocity ◽  
Hall Sensor ◽  
Voltage Response ◽  
Giant Magnetoimpedance ◽  
Gmi Effect ◽  
Sensing System ◽  
Measurement Results ◽  
Large Measurement

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.

scholarly journals Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6107
Author(s):  
Anna T. Kurzych ◽  
Leszek R. Jaroszewicz ◽  
Michał Dudek ◽  
Jerzy K. Kowalski ◽  
Felix Bernauer ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Performance Test ◽  
Rotational Velocity ◽  
Target Object ◽  
Fiber Sensors ◽  
Full Field ◽  
Rotational Seismology ◽  
Full Field Measurement ◽  
Measurement Results ◽  
Sensor Properties

Measurements of artificial events can substantially confirm the data validity of constructed rotational sensors, as well as provide methods for simplifying the measurement process. The above task, especially with international cooperation, can provide full-field measurement results of the target object, which can deliver more significant data and sensor properties. The paper presents vertical rotational velocity recordings gathered during an international experiment that took place at the Geophysical Observatory of the Ludwig Maximilian University of Munich in Fürstenfeldbruck, Germany. Data were obtained during artificial explosions, as well as external excitations induced by a VibroSeis truck. The authors present data recorded by two prototypes of optical fiber rotational sensors. They have been specially designed for rotational seismology needs and are characterized by a theoretical sensitivity equal to 2 × 10−8 rad/s/√Hz and a wide measuring range both in amplitude even up to 10 rad/s, and a frequency from DC to 1000 Hz. Their self-noise investigation during the aforementioned experiment showed that both sensors have precision no worse than 2 × 10−6 rad/s/sqrt (Hz) in all desired frequency range from 0.01 to 100 Hz. A down-sampling and a spectral analysis of the recorded signals are also presented. The recorded data and their analysis confirmed the performance and reliability of the applied optical fiber rotational sensors. Moreover, the presented international experiment underlines a special necessity for specifying the sensors’ performance test methodologies in the rotational seismology.

An integrated three-dimensional micro-solenoid giant magnetoimpedance sensing system based on MEMS technology

2019 ◽  
Vol 299 ◽  
pp. 111640 ◽  
Author(s):  
Zhu Feng ◽  
Shaotao Zhi ◽  
Mingchen Wei ◽  
Yong Zhou ◽  
Cui Liu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Giant Magnetoimpedance ◽  
Sensing System ◽  
Mems Technology

A Rotation-Speed Measurement System Based on Magneto-Inductive Effect

2020 ◽  
Vol 18 (4) ◽  
pp. 299-303
Author(s):  
Tao Wang ◽  
Bicong Wang ◽  
Yuyi Chen ◽  
Yufeng Luo
Keyword(s):  
Direct Current ◽  
Measurement System ◽  
Rotational Speed ◽  
Inductive Effect ◽  
Rotation Speed ◽  
Rotating Shaft ◽  
High Rotational Speed ◽  
Sensing System ◽  
Dc Motors ◽  
Speed Measurement

There are few reports on high rotational speed measurement of brushless direct current (DC) motors based on giant magneto-inductive effect. In this study, a rotational speed measurement system based on giant magneto-inductive effect is established for measuring the rotational speeds of DC motors. Successive sawtooth waves are found when rotating shaft is close to the GMI sensor. Through using the magneto-inductive sensing system, different high rotational speeds (1500∼24000 r/min) of the motor are accurately measured. Therefore, this giant magneto-inductive sensor may be used for high rotational speed measurement of motors.

Sign in / Sign up

Export Citation Format

Share Document