High-accuracy magnetic position encoder concept

Lequesne, Bruno; Schroeder, T. W.

doi:10.1109/28.767003

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…In this part, the results were analyzed combined with two basic error equations as shown in equations ( 5) and (6). Equation (5) shows the calculation of relative error e. Parameter T equals to T 0 plus Δt (Δt can be positive, negative or zero).…”

Section: Ivb Experiments Results and Error Analysismentioning

confidence: 99%

“…Equation (5) shows the calculation of relative error e. Parameter T equals to T 0 plus Δt (Δt can be positive, negative or zero). Considering the sampling rate fs, equation ( 5) can be rewritten as equation (6), in which n is the reference speed with unit of rpm and N is the number of sample interval that the calculated period T deviates from the reference period T 0 . Obviously, N is equal to Δt /fs.…”

Section: Ivb Experiments Results and Error Analysismentioning

confidence: 99%

“…The digital speed measuring method utilizes the shaft encoder and electronic circuits to measure the rotational speed [4]. Optical and Hall methods for the encoder are widely used [5,6]. A lot of research was carried out to improve the accuracy, dynamic response and other properties [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Use of double correlation techniques for the improvement of rotation speed measurement based on electrostatic sensors

Wang

et al. 2015

Meas. Sci. Technol.

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Electrostatic sensing technology using correlation signal processing offers an approach to the measurement of rotational speed in the automatic control system of large generators and centrifugal machines. In this article, a double autocorrelation method was proposed to improve the accuracy and robustness of the measurement on the designed test rig. An electrostatic sensor was used to obtain signals from the rotor surface. Then, the rotational speed was determined from the period of rotational motion calculated from a double autocorrelation method. At the same time, experiments with sampling rates of 2ksps (kilo samples per second), 5ksps, 10ksps, 20ksps were carried out on a laboratory-scale test rig under a rotational speed range from 400 r min −1 to 4200 r min −1 . The results show that the double autocorrelation method improves the accuracy and robustness. The measurement accuracy also improves with the sampling rate-the relative errors using 2ksps, 5ksps, 10ksps, and 20ksps are within 1.5%, 1%, 0.4%, and 0.3% respectively. The linearity of them is 1.47%, 0.61%, 0.28%, 0.17% correspondingly. The experiments also reveal that the measurement error has a tendency to increase with the rotational speed.

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Section: Ivb Experiments Results and Error Analysismentioning

confidence: 99%

Section: Ivb Experiments Results and Error Analysismentioning

confidence: 99%

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Use of double correlation techniques for the improvement of rotation speed measurement based on electrostatic sensors

Wang

et al. 2015

Meas. Sci. Technol.

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“…The output voltage from sensing of the HES (V H ) as a function of the magnetic density can be calculated by Equations (2) and (3).…”

Section: Sensing Part and Error Analysismentioning

confidence: 99%

“…However, the most common problem would be the error in machine operation caused by the level of land subsidence in the areas where a number of large and heavyload machines are placed. Generally, the angle can be measured by using several methodologies [1][2][3][4]. Angular measurement based on magnetic field method using the HES was the alternative methodology to measure and monitor land subsidence.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Land Subsidence Using the HES

Sriratana¹,

Murayama²

2012

JEMAA

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This study presents a methodology for analysis of the industrial machine alignment in the production line. The level of land subsidence in the area of the industrial machine location was assessed by adopting Hall Effect Sensor (HES). A computer was used for real-time data collecting and displaying the angle of subsidence over operational period. The measurement module consists of two flat-curve permanent magnets mounted parallelly and the magnetic poles which were placed in position that can be generating the magnetic tension force. The center between two permanent magnets was the sensor namely HES placed perpendicularly to the magnetic fluxes. The permanent magnets were the moving parts which can be displaced depending on the inclined angle of land subsidence. Analysis of the relationship between the incline angle of the measurement module and the output voltage from the HES was considered from the function of subsidence angle and magnetic density on X-axis and perpendicular angle (Y-axis) with the resolution of 100 mV per degree. There were two ranges of measurement according to the angle resolution, –20 to 20 degree at 1 degree of resolution per step and –6 to 6 degree at 0.01 degree of resolution per step

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