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17 results on '"Tang, Qifu"'

1. A Small-Size Inductive Absolute Angular Displacement Sensor

Author

Xia, Ju, Tang, Qifu, Wang, Yang, and Tang, Qingyun

Abstract

Traditional absolute angular displacement sensors usually cannot meet the requirements of high measurement accuracy, low environmental sensitivity, and operation in small space at the same time. This article proposes an inductive absolute angular displacement sensor, which is able to achieve high accuracy with small-sized sensing structure. The sensor employs a resonant rotor coil to enhance the strength of the induction signal, even if there are a few induction coils on the stator. The dual-channel method of absolute angular displacement measurement is used to achieve high measurement accuracy, and the environmental sensitivity is reduced by the inductive sensing method. A sensor model was established and simulated to verify the feasibility of the sensor, and then, a printed circuit board (PCB)-based prototype was fabricated. The prototype with an outer diameter of 38 mm and inner diameter of 13 mm ensures its applicability in space-limited working conditions. The experimental results show that the original error of the sensor prototype in the full scale is from -63” to 65”.

Published
2024
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2. Parasitic time-grating angular displacement sensor for precision position measurement of turntable bearing.

Author

Wang, Yangyang, Qin, Yi, Chen, Xihou, Peng, Donglin, Wu, Liang, Zhang, Tianheng, and Tang, Qifu

Subjects
POSITION sensors, SENSOR placement, TURNTABLES, SIGNAL processing, FINITE element method
Abstract

This paper proposes a parasitic time-grating angular displacement sensor for detecting the position of the turntable bearing. The sensor is mainly composed of probe, rotor, and supporting signal circuit. The probe consists of two separated measuring units on the left and right, and each measuring unit is composed of four sensing units with iron cores, excitation windings, and induction windings arranged according to specific rules. The rotor is made of sinusoidal isometric grooves based on the bearing end cover of the original turntable bearing. The signal processing circuit is used to filter, amplify, and compare the induction signal; meantime, it can generate the excitation signal. The high-frequency clock pulse signal is used as the measurement benchmark to realize the analysis of the position information of the induction signal. The structure and working principles of the sensor are presented in detail. Through the finite element method simulation, the feasibility of sensor scheme is verified, and the theoretical resolution of the prototype sensor is estimated to be about 1.33e−5. A sensor prototype is designed for testing, and the experimental results show that its accuracy can reach −0.003611° to 0.002583° in the range of [0°, 360°] after compensating the error point-by-point through the look-up table method. [ABSTRACT FROM AUTHOR]

Published
2023
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14. An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

Author

Xihou Chen, Tang Qifu, Wu Liang, and Donglin Peng

Subjects
Engineering, business.industry, Rotor (electric), Angular displacement, Stator, Acoustics, Phase (waves), Electrical engineering, Signal, law.invention, Search coil, law, Electromagnetic coil, Electrical and Electronic Engineering, Inductive sensor, business, Instrumentation
Abstract

This paper introduces a noncontact, low-cost, and reliable inductive sensor for angular displacement measurement. It is suitable to work in harsh industrial environments. The sensor has simple structure consisting of three key parts: a ferromagnetic stator, which is a pure plane; a ferromagnetic rotor, which has face slots; and four layers of planar copper coils, including primary and secondary coils. Primary coils are supplied with two orthogonal 4000-Hz ac, and secondary coils output a signal whose phase is proportional to angular displacement. Primary coils are designed with sinusoidal shape, so that magnetic field between the stator and rotor has approximately sinusoidal distribution, and finally linearity between the phase variation of output signal and angular displacement is well helped by this design. The structure and working principles of the sensor are explained in detail. Moreover, a sensor model was simulated to verify the feasibility of the sensor working principles and a sensor prototype was designed for actual experiment. At last actual experiment results are given and analyzed, showing that the sensor prototype has achieved accuracy better than ±12 arcsec in the range of 0°-360°, and this kind of sensor may have a better performance by improving the layout of primary coils and front-end signal-process circuit.

Published
2015
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