Research on Angle Subdivision Method of Multi-Pole Magnetic Encoder Based on Pole Number Quotient Remainder

Wang, Lei; Wu, Yue; Zhang, Yongde; Hao, Shuai

doi:10.1109/tmag.2021.3106158

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Less memory is required to calculate angles. [17] Angular Segmentation Method The method proposed in this paper is more accurate.…”

Section: Referencementioning

confidence: 99%

Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle

Zhao,

Zhang,

Tian

et al. 2024

Phys. Scr.

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As a kind of sensor for real-time feedback and dynamic monitoring of angular velocity and angular displacement of the system, the common photoelectric encoder is widely used in many fields such as new energy electric vehicles, servo closed-loop control systems, industrial control, security monitoring. In order to improve the resolution and accuracy, a kind of optical and magnetic combined encoder which combines photoelectricity and multi-pole magnetoelectricity is designed in this paper, where the light-blocking disk of photoelectric sensor is designed according to the pseudo-random sequence, and the photoelectric coding is used to determine the magnetic interval of multi-pole. The absolute angle is calculated according to the number of multiple circles plus the angle of single circle. The experimental results at different temperatures (−40 C~100 C) show that the accuracy of the proposed combined encoder can reach ±0.08°, which is improved by 0.37° compared with that of the single-pole encoder. Finally, the combined encoder was applied to the pan-tilt-zoom (PTZ) camera of a video surveillance enterprise, and the experiment showed that its repeated positioning accuracy reached ±0.02°, which is greatly improved compared with single-pole encoder.

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“…Less memory is required to calculate angles. [17] Angular Segmentation Method The method proposed in this paper is more accurate.…”

Section: Referencementioning

confidence: 99%

Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle

Zhao,

Zhang,

Tian

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Therefore, it is necessary to introduce filtering algorithm to eliminate these interferences. At present, the commonly used denoising method are band-pass filters and mean filters [19][20][21][22][23][24][25][26]. However, as general filters, band-pass filter and mean filter do not consider the prior information that the grating encoder signal is sinusoidal, and thus do not achieve the best filtering result.…”

Section: Introductionmentioning

confidence: 99%

Instantaneous grating signal subdivision system with non-linear Kalman filters

Wang

Shi

Li³

et al. 2022

Optical Design and Testing XII

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Grating encoder is a sinusoidal encoder based on grating diffraction principle, which is currently utilized in many high-precision displacement systems because of its advantageous characteristics: low cost, simple structure, works in harsh environments, high reliability, and so on. The output signal of grating encoder usually contains noise interference error, amplitude inconsistency error, DC bias error, harmonic error and quadrature phase error. These non-ideal factors are the main reasons for affecting the precision of subdivision. In the traditional signal subdivision system, it is usually necessary to compensate each kind of error separately, which will consume many hardware and computing resources and cause a significant output latency, especially in the filtering section and normalization section. In this paper, a non-linear Kalman filter-based sin-cos wave subdivision method is proposed. Compared with the traditional filtering methods, non-linear Kalman filter has higher dynamic response and can provide instantaneous phasor estimation. In addition, it can simultaneously achieve filtering, amplitude normalization, decoupling DC bias, harmonic suppression, and phase compensation functions, which significantly reduces the computational burden and facilitates the implementation on low-cost processors. In this study, a non-linear Kalman filter-based signal segmentation system is implemented on an FPGA platform and verified on a six-degree-of-freedom grating ruler platform. The results show that the single-channel output delay is only 1.8us at a 50MHz clock, which has a very high real-time ability. When the frequency and amplitude of the input signal varies, the non-linear Kalman filter can track instantaneously and has high dynamic characteristics. Experimental results show the effectiveness of this method.

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Compensation for Dynamic Subdivision Error When the Grating Displacement Sensor Code Disk is Stained

2023

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Research on Angle Subdivision Method of Multi-Pole Magnetic Encoder Based on Pole Number Quotient Remainder

Cited by 8 publications

References 25 publications

Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle

Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle

Instantaneous grating signal subdivision system with non-linear Kalman filters

Compensation for Dynamic Subdivision Error When the Grating Displacement Sensor Code Disk is Stained

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