New Type of Position Encoder with Possibility of Direct Zero Position Adjustment

Denić, Dragan; Randelovic, I.

doi:10.1109/idaacs.2005.282991

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…After mounting the encoder on the movable system shaft, some unmatchings in the starting position of the encoder and the shaft can happen. Therefore, what is needed is to adjust the zero position of the position encoder to the corresponding zero position of the movable system [11,12]. Fortunately, the pseudorandom position encoders, thanks to some features of the pseudorandom binary sequence, can provide a sophisticated solution of this problem.…”

Section: Algorithm For Improved Zero Position Adjustmentmentioning

confidence: 99%

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Pseudorandom position encoder with improved zero position adjustment

et al. 2012

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Pseudorandom position encoder, which employs two code tracks for absolute position measurement, represents one of the latest trends in the development of the absolute position encoders. One sensor head is used for pseudorandom code reading and two additional sensor heads are used for generating synchronization pulses and motion direction determination. Special attention is devoted to the zero position adjustment after the installation of the encoder on the motor shaft. A novel solution for the improved zero position adjustment incorporated in the functional algorithm of the encoder is presented in this paper. The presented solution offers a reliable procedure for the zero position adjustment, taking into account possible motion direction changes during the zero position adjustment process. The algorithm for the zero position adjustment executes only once and does not participate further in the absolute position measurement process. The functioning of the proposed algorithm is described in more details considering one concrete example of the encoder. [Projekat Ministarstva nauke Republike Srbije, br. TR32045]

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Section: Algorithm For Improved Zero Position Adjustmentmentioning

confidence: 99%

“…The pseudorandom position encoder with parallel code reading method has a relatively easier zero position adjustment procedure [11,12]. This encoder employs an integrated circuit which has a linear photodetector array for simultaneous reading of all n bits from the pseudorandom code track.…”

Section: Algorithm For Improved Zero Position Adjustmentmentioning

confidence: 99%

Pseudorandom position encoder with improved zero position adjustment

et al. 2012

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“…In view of the characteristics of the GECS mentioned above, to overcome the low accuracy of coarse localization of a double-track PDGECS and to avoid large size or complicated structure of a PDGECS, a GECS, the operational principle of which is based on the phase of one track and the code of the other track, is described in this paper (hereinafter, this kind of sensor will be referred to as a combinatorial code grating eddy-current sensor (CCGECS)). The method with phase of one track as precise localization of the PDGECS is adopted by the CCGECS, but the coarse-localization method is improved by using single-track code to realize coarse localization as a replacement of phase difference among multiple tracks as coarse localization of the PDGECS [7][8][9]. The measurement principle of the CCGECS is introduced in section 2.…”

Section: Introductionmentioning

confidence: 99%

Analysis of technical requirements and the self-modification method for a combinatorial code grating eddy-current absolute-position sensor

Liu¹,

Zhao²,

Tao³

et al. 2012

Meas. Sci. Technol.

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In order to overcome the shortcomings of the low coarse-localization accuracy of a phase difference grating eddy-current sensor (PDGECS), a combinatorial code grating eddy-current sensor (CCGECS) is presented in this paper. A single-track code localization method is adopted in a CCGECS to realize the coarse localization of a grating eddy-current sensor (GECS). This method is used as a replacement of the multi-track phase difference localization method in a PDGECS. The measurement principle of a CCGECS is introduced in this paper. The relationship between measurement accuracy and main characteristic parameters of sensor is obtained by mathematical deduction and error analysis, which offers theoretical foundation for design and technical requirements analysis of a sensor. A simple and practical self-modification method is also introduced in this paper. Experimental results show that adoption of a single-track code localization method to realize the coarse localization has greatly improved the coarse-localization accuracy of a GECS, resolved the contradiction between the coarse-localization accuracy and the measurement range caused by the multi-track phase difference localization method, realized the absolute-position measurement for a larger range and at the same time reduced the technical requirements, which lays a solid foundation for mass production of a CCGECS.

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“…For attaining exact position some people have purposed many methods. Some methods have higher position precision [1][2][3], but it is usually expensive and complex. Meanwhile, some methods with low cost only get the lower position precision [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Study of Movement Encoder with Low Cost and High Performance

Wang

2012

AMM

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The paper proposes a design scheme of movement encoder with low cost and high performance. The scheme can provide higher precise rotor position signal for motor by a hall-effect latch and a linear hall-effect sensor, and it can also provide rotational speed and direction of motor by a winding with full pole distance, at last we deduce a torque balance equation based on speed and acceleration of motor. The study shows that the scheme with low cost have much higher position precision than traditional rotational transformer and hall-effect position sensor, and it does not exist amplitude error and phase error, function error is small. It is very worthy to the wide application of motor of electric bicycle, wind-driven generator, electric car, and servomotor, etc.

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New Type of Position Encoder with Possibility of Direct Zero Position Adjustment

Cited by 6 publications

References 10 publications

Pseudorandom position encoder with improved zero position adjustment

Pseudorandom position encoder with improved zero position adjustment

Analysis of technical requirements and the self-modification method for a combinatorial code grating eddy-current absolute-position sensor

The Study of Movement Encoder with Low Cost and High Performance

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