Rotational speed measurement of ring spinning based on magnetic sensor

Abstract

This study introduces a rotational speed measurement method based on magnetic anomaly detection to monitor the traveler’s speed in ring spinning. A structure and theoretical model of anomalous magnetic field detection were built. Rotational speed can be calculated from the output signal acquired through tunnel magnetoresistance. A testing system was developed to test sensor performance. The output signals of the sensor at different rotational speed, working gap, and fixed offset were experimentally investigated. The result showed that the proposed sensor can meet the rotational speed measurement requirement of ring spinning. Finally, the practical application of the sensor in a ring spinning machine was introduced. The result indicates that the system can satisfy the practical application of yarn break detection with the advantages of compact size, high sensitivity, strong anti-interference capability, good stability, high reliability, and so on. The method proposed in this paper has shown great potential in providing the production status of the spinning field.

An Identification Method for Rotor Direction Based on Charge Induction

“…Then, the output signal Vo1 of metal electrode 1 can be obtained from Equations (3)-(5), and the output signal Vo2 of metal electrode 2 can be obtained from Equations (3), (4) and (7). Supposing that the center of the two electrodes is symmetrical to the center of the rotor and the distance d between the centers of the two electrodes is equal to 6 cm, the output signals of the two metal electrodes can be obtained, as shown in Figure 6.…”

“…The traditional mechanical tachometer, such as the centrifugal tachometer, can be used for preliminary detection of the rotor speed. In addition, a series of detection methods based on electricity, optics, and magnetism have been proposed [ 2 , 3 , 4 , 5 ]. Cheng Liu et al proposed a rotational speed measuring system on the basis of a laser mouse sensor [ 6 ].…”

Novel laser Doppler tachometer

“…Commonly used methods to measure rotational speed include the frequency measuring method, periodic measuring method, and frequency-period measuring method, and they calculate the rotational speed by measuring the frequency of the periodic pulse signal caused by the rotor. Because of the pulse quantization error ±1, their measurement accuracy will have certain errors [4][5][6][7][8] , and the relative measurement errors are 1=N (N is the number of repeated changes of the measured signal), 1=m 1 (m 1 is the number of counting clock pulses), and 1=m 2 (m 2 is the number of counting clock pulses), respectively. In addition, the photoelectric or magnetoelectric sensors used for measurement need to be directly installed on the measured object using the above methods in practical applications, and this will change the object's origin working condition, which influences the measurement accuracy.…”

Non-contact and high-precision displacement measurement based on tunnel magnetoresistance

“…The properties of TMR magnetic sensing devices include high sensitivity, miniaturized size and thermal stability [16]. Owing to the superior performance, TMR-based devices are applied in data storage [17], defect inspection [18,19], rotational speed measurement [20], strain sensing [21], electro magnetic tomography [22], navigation [23] and many other fields. However, despite the application of TMR in displacement sensing is feasible, the potential of displacement measurement based on TMR is not fully explored.…”