Design and Realization of a Compact High-Precision Capacitive Absolute Angular Position Sensor Based on Time Grating

Wang, Hewen; Peng, Kai; Liu, Xiaokang; Yu, Zhicheng; Chen, Ziran

doi:10.1109/tie.2020.2977540

Cited by 22 publications

(15 citation statements)

References 35 publications

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“…where A is the current amplitude; N i and N s are the coil turns of the induction winding and excitation winding, respectively; F is the magnetic flux of the induction winding excited by the current in the excitation winding; L denotes the air gap permeability; m is the permeability; and s is the tooth section area. According to Wu et al (2016) and Wang et al (2021), the variation in air gap permeability with angle u can be expressed as…”

Section: Basic Principle Of Measurementmentioning

confidence: 99%

“…The parasitic time-grating angular displacement sensors have the merits of small size, light weight, low cost, and high precision, so they have been widely applied to various fields. An absolute inductive angular displacement sensor was presented by Wang et al (2021). For this type of sensor, the end cover of the turntable bearing is processed into a rotor with an equal gear groove structure.…”

Section: Introductionmentioning

confidence: 99%

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Parasitic time-grating angular displacement sensor for precision position measurement of turntable bearing

Wang

Qin

Chen

et al. 2023

Transactions of the Institute of Measurement and Control

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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.

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Section: Basic Principle Of Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parasitic time-grating angular displacement sensor for precision position measurement of turntable bearing

Wang

Qin

Chen

et al. 2023

Transactions of the Institute of Measurement and Control

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“…Electromagnetic and capacitive rotary encoders are able to provide accurate angle measurement even in harsh environment [6,7]. And the resolution can reach micro-radian level and the measuring error is lower than ±5arcsecond over the full-circle range after artificial correction [8,9]. However, the biggest drawback of the electronic rotary sensors is that the sensing head needs to be fixed on the rotary target.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity and Full-Circle Optical Rotary Sensor for Non-Cooperatively Tracing Wrist Tremor With Nanoradian Resolution

Dai

Wang

et al. 2022

IEEE Trans. Ind. Electron.

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An optical rotary sensor based on laser self-mixing interferometry is proposed, which enables noncontact and fullcircle rotation measurement of non-cooperative targets with high resolution and sensitivity. The prototype demonstrates that the resolution is 0.1μrad and the linearity is 2.33×10 -4 . Stability of the prototype is 2μrad over 3600s and the repeatability error is below 0.84°under 9-gruop full-circle tests. The theoretical resolution reaches up to 16nrad. Random rotation has been successfully traced with a bionic hand to simulate the tremor process. Error analysis and limitation discussion have been also carried out in the paper. Although the accuracy needs further improvement compared with the best rotary sensor, this method has its unique advantages of non-cooperative target sensing, high sensitivity and electromagnetic immunity. Hence, the optical rotary sensor provides a promising alternative in precise rotation measurement, tremor tracing and nano-motion monitoring.

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“…Sensors based on various non-contact sensing techniques, such as magnetic [2]- [5], MEMS (capacitive) [6], optical [7], and capacitive [8], [9], have been reported for steering angle sensing. In addition, other general-purpose rotary sensors reported in the literature can be incorporated to measure the steering position [10]- [12]. Nearly all of the reported sensors [2]- [12] require an attachment (to make changes in the output with respect to the position) to be fitted to the shaft whose position is to be measured.…”

Section: Introductionmentioning

confidence: 99%

An Eddy-Current-Based Angle Sensor With a Minimally Modified Shaft as a Sensing Element

Kumar

George

Mukhopadhyay

2022

IEEE Open J. Instrum. Meas.

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Eddy current sensors are an attractive choice due to their high resolution, reliability, and durability in harsh environments while being able to measure in a non-contact manner. This paper presents a novel design to realize a thin eddy current-based angle sensor. It is realized by converting the shaft, whose rotation angle is to be measured, into the sensing element. The modification to the shaft is minimal; a small surface groove is introduced without affecting the mechanical strength. The stationary part of the sensor consists of two layers of flexible square-planar coils. Depending on the angular position of the shaft, the inductances of the planar coils get modified. These are measured using a specially designed circuitry, optimized for this sensor. The output for the entire circle range (360 o ) is derived from the inductance values of each coil using a successive approximation algorithm developed for this purpose. Finite element analysis was employed to design the sensor and analyze the axial/radial misalignment of the rotor. A sensor prototype was built and tested. The output showed a resolution of 0.1 o and the worst-case linearity error of 0.9%. The prototype sensor dimensions are designed to fit in a standard steering column. The proposed sensor is thin, easy to manufacture at low cost, tolerant to axial vibration by design, and has a 360 o sensing range.

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Design and Realization of a Compact High-Precision Capacitive Absolute Angular Position Sensor Based on Time Grating

Cited by 22 publications

References 35 publications

Parasitic time-grating angular displacement sensor for precision position measurement of turntable bearing

Parasitic time-grating angular displacement sensor for precision position measurement of turntable bearing

High Sensitivity and Full-Circle Optical Rotary Sensor for Non-Cooperatively Tracing Wrist Tremor With Nanoradian Resolution

An Eddy-Current-Based Angle Sensor With a Minimally Modified Shaft as a Sensing Element

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