The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform
Vivek Agarwal - One of the best experts on this subject based on the ideXlab platform.
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high resolution absolute position vernier Shaft Encoder suitable for high performance pmsm servo drives
IEEE Transactions on Instrumentation and Measurement, 2006Co-Authors: Shashank Wekhande, Vivek AgarwalAbstract:Permanent magnet synchronous motor (PMSM) drives are suitable for high-performance servo applications, as in robotics. This, however, requires an accurate position feedback, which is not possible with the existing absolute position Encoders, unless one is prepared to compromise on the size of the Encoder. This paper proposes a new encoding scheme based on the simple Vernier principle. The proposed scheme improves the resolution of the Encoder within limited disk diameter. An improved Encoder based on the same principle is also presented with minor modifications to improve the resolution. Computer simulations and experimental work have shown that a suitable modification of the Vernier concept can result in an Encoder that is superior to the existing ones. Details of this work are presented.
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high resolution absolute position vernier Shaft Encoder suitable for high performance pmsm servo drives
Power Electronics Specialists Conference, 1998Co-Authors: Shashank Wekhande, Vivek AgarwalAbstract:PMSM drives are suitable for high performance servo applications, as in robotics. This, however, requires an accurate position feedback, which is not possible with the existing absolute position Encoders, unless one is prepared to compromise on the size of the Encoder. This paper proposes a new encoding scheme, based on the simple Vernier principle. Computer simulations and experimental work have shown that a suitable modification of the Vernier concept can result in an Encoder, which is superior to the existing ones. Details of this work are presented.
P R Belanger - One of the best experts on this subject based on the ideXlab platform.
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estimation of angular velocity and acceleration from Shaft Encoder measurements
The International Journal of Robotics Research, 1998Co-Authors: P R Belanger, P Dobrovolny, Amr S Helmy, X ZhangAbstract:This paper suggests a Kalman-filter approach to the estimation of angular velocity and acceleration from (quantized) Shaft-Encoder measurements. Finite-difference estimates deteriorate as sampling rates are increased. For small sampling periods, we show that the filtering problem is the dual of the cheap control problem, and we jus tify the use of all-integrator models. We investigate Kalman filtering with constant sampling rate, and also with measurements triggered by Encoder pulses. Simulation and experimental results are given.
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estimation of angular velocity and acceleration from Shaft Encoder measurements
International Conference on Robotics and Automation, 1992Co-Authors: P R BelangerAbstract:The output of a Shaft Encoder is basically a quantized measurement of the Shaft angle. One method of angular velocity and acceleration measurement is by finite difference of angle measurements (net pulse counts) at regular time samples. It is shown that these estimates become significantly degraded as sampling rates increase. Kalman filtering of the angle measurements, based on some model of signal generation, is proposed. Asymptotic analysis of constant sampling rate as the intersample time tends to zero shows that the error variances tend to zero, but at decreasing rates for the angle, velocity, and acceleration errors. The analysis also suggests the use of multiple-integrator systems to model the angle signal. >
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ICRA - Estimation of angular velocity and acceleration from Shaft Encoder measurements
Proceedings 1992 IEEE International Conference on Robotics and Automation, 1Co-Authors: P R BelangerAbstract:The output of a Shaft Encoder is basically a quantized measurement of the Shaft angle. One method of angular velocity and acceleration measurement is by finite difference of angle measurements (net pulse counts) at regular time samples. It is shown that these estimates become significantly degraded as sampling rates increase. Kalman filtering of the angle measurements, based on some model of signal generation, is proposed. Asymptotic analysis of constant sampling rate as the intersample time tends to zero shows that the error variances tend to zero, but at decreasing rates for the angle, velocity, and acceleration errors. The analysis also suggests the use of multiple-integrator systems to model the angle signal. >
Himadri Sekhar Dutta - One of the best experts on this subject based on the ideXlab platform.
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Fuel level measurement system based on absolute Shaft Encoder
Sensors and Actuators A: Physical, 2017Co-Authors: Tuhin Subhra Sarkar, Subir Das, Badal Chakraborty, Himadri Sekhar DuttaAbstract:Abstract In this article a new type of absolute Shaft Encoder is presented for the measurement of fuel level in a tank. This measurement technique is based on the principle of sensing the float arm displacement with respect to the fuel level. Here, the mechanical displacement is detected by an absolute Shaft Encoder and each position is represented by variant intensity of lights. Furthermore, the variation of light intensity is converted into voltage level by using a signal processing circuit (SPC) and calibrated with measured fuel level. Experimentally, it is observed that the developed prototype is able to measure the fuel level up to the range of 30 cm within the accuracy of ± 1% FSO.
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A Simple Approach to Design a Binary Coded Absolute Shaft Encoder
IEEE Sensors Journal, 2016Co-Authors: Subir Das, Tuhin Subhra Sarkar, Badal Chakraborty, Himadri Sekhar DuttaAbstract:In this paper, an optical type absolute Shaft Encoder coding pattern is presented. Compared with the conventional binary or gray code pattern resolution ( ${2}^{n}$ ), the proposed code exhibits two times more resolution ( $2^{n^{2}}$ ). Even, to represent high density positional information of rotating object, it is required very less number of tracks. This pattern sequence is based on $n$ -by-2 matrices of binary codes where consecutive two columns of each code represented as high–low order bits. To retrieve the encoded position from these coding patterns, an extra pulse track was added at the outside of coded tracks. Moreover, it was used for providing a synchronized clock pulse into a simple photodetector-based sequential logic circuitry; it is the decoding unit of this Encoder. Thus, depending on these synchronized pulses, the proposed Encoder is able to provide error free positional information for a high-speed rotating object. Eventually, in order to prove this concept, a prototype is designed and tested, where a satisfactory performance was achieved.
Xiaodong - One of the best experts on this subject based on the ideXlab platform.
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Decoding techniques of single-ring absolute photoelectric Shaft Encoder
Infrared and Laser Engineering, 2017Co-Authors: Xiaogang, Xiaodong, MaosenAbstract:In comparison with incremental and traditional absolute Encoder, the single-ring absolute Encoder processes more advantage. And the research of decoding system and algorithm are essential to the single-ring absolute Encoder. In order to improve single-ring absolute photoelectric Encoder's circuit integration, response speed and accuracy, a decoding system was designed in this paper. Linear CCD was used in this system as the disc image receiving and photoelectric conversion device which also provided the basement of subdivision algorithm. And FPGA was used to achieve circuit control and decoding algorithm. A new decoding algorithm was also proposed in this paper. On the one hand, the coding information was achieved by counting high electrical level of the binaryzation signal of CCD's output. Coding information was obtained by recognition of the disc image and combination of 12-bits coding number. On the other hand, precise value was obtained by calculating the shifting between the centroid of image and virtual center. The centroid of stripe was calculated based on CCD centroid location algorithm. Finally, the value of angle was precisely received from combination of these two values. A prototype of theodolite was developed based on this single-ring absolute Encoder decoding system and can reach the accuracy of 2". © 2017, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
Shashank Wekhande - One of the best experts on this subject based on the ideXlab platform.
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high resolution absolute position vernier Shaft Encoder suitable for high performance pmsm servo drives
IEEE Transactions on Instrumentation and Measurement, 2006Co-Authors: Shashank Wekhande, Vivek AgarwalAbstract:Permanent magnet synchronous motor (PMSM) drives are suitable for high-performance servo applications, as in robotics. This, however, requires an accurate position feedback, which is not possible with the existing absolute position Encoders, unless one is prepared to compromise on the size of the Encoder. This paper proposes a new encoding scheme based on the simple Vernier principle. The proposed scheme improves the resolution of the Encoder within limited disk diameter. An improved Encoder based on the same principle is also presented with minor modifications to improve the resolution. Computer simulations and experimental work have shown that a suitable modification of the Vernier concept can result in an Encoder that is superior to the existing ones. Details of this work are presented.
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high resolution absolute position vernier Shaft Encoder suitable for high performance pmsm servo drives
Power Electronics Specialists Conference, 1998Co-Authors: Shashank Wekhande, Vivek AgarwalAbstract:PMSM drives are suitable for high performance servo applications, as in robotics. This, however, requires an accurate position feedback, which is not possible with the existing absolute position Encoders, unless one is prepared to compromise on the size of the Encoder. This paper proposes a new encoding scheme, based on the simple Vernier principle. Computer simulations and experimental work have shown that a suitable modification of the Vernier concept can result in an Encoder, which is superior to the existing ones. Details of this work are presented.