New interpolation method for quadrature encoder signals

Tan, Kok Kiong; Zhou, Haibo; Lee, Tong Heng

doi:10.1109/tim.2002.806028

Cited by 99 publications

(58 citation statements)

References 11 publications

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“…Thus, influences of roll and pitch movement are considered the same as vertical movements, affecting only the amplitude of PCIDS outputs. Then, the actual PCIDS model against static and dynamic disturbances is illustrated as (10), (11 …”

Section: B Signal Model Against Disturbancesmentioning

confidence: 99%

“…Commonly, PCIDS signals are squared into electrical pulses, the number of which is counted to determine displacement information [11]- [15]. Tan et al introduced an interpolation method based on constructing and squaring a set of high-order sinusoids.…”

Section: Introductionmentioning

confidence: 99%

“…Tan et al introduced an interpolation method based on constructing and squaring a set of high-order sinusoids. A look-up table was used offline to compensate for interpolation errors [11]. Hu et al proposed a method to solve λ/16 bidirectional subdivision for quadrature signals by constructing two sets of reference signals [12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Novel Quadrature Signal Estimation Method for a Planar Capacitive Incremental Displacement Sensor

Wang

et al. 2016

Measurement Science Review

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This paper presents a novel phase-shift arctangent (PSA) interpolation method to improve the measurement accuracy of a planar capacitive incremental displacement sensor. Signals of planar capacitive micro-sensors acquire waveform errors, including sensitivity differences and phase-shift errors, because of static errors and dynamic disturbances. In the proposed PSA scheme, such errors are removed completely by loading a particular arctangent function. Moreover, measuring efficiency of the proposed planar capacitive sensors is improved by combining coarse measurement and fine estimation. Experiments show unanimous results to model-based fitting. When electrode length is four times the gap distance, applying the PSA interpolation method decreases waveform errors from more than 4 % to 1.72 %.

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Section: B Signal Model Against Disturbancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Quadrature Signal Estimation Method for a Planar Capacitive Incremental Displacement Sensor

Wang

et al. 2016

Measurement Science Review

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“…With the estimated errors, the line signals could be corrected. A second paper [12] proposes a structure of lookup tables, which are generated offline to interpolate the quadrature signals by calculating higher harmonics to form a quadrature system with a multiple number of cycles. The tables are generated in such a way that during the angle evaluation, offsets, a phase shift and amplitude errors are automatically compensated.…”

Section: Introductionmentioning

confidence: 99%

Online Estimation and Correction of Systematic Encoder Line Errors

et al. 2017

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This paper addresses the identification and correction of amplitude and offset errors in the sinusoidal outputs from incremental position encoders. Precise angular position measurement is of high importance in many position control applications. Manufacturing tolerances and noise from thermal and electromagnetic interference sources introduce systematic and random errors in the orthogonal sine cosine output line signals. Evaluation of these signals reproduces deviations in the measured angular position. This paper proposes two methods to identify and compensate for the influence of the systematic errors online without the necessity of a reference measurement during identification. The key component of the methods is a nonlinear estimator that exploits the orthogonality property of harmonic functions. The first method explains the basic idea with a scalar error model and operates continuously but exhibits an angular shift in direction of rotation during transients of the parameters, whereas the second method assumes an error model with error parameters as a function over one full revolution of the encoder. The latter updates the error function iteratively in subsequent revolutions.

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“…Although these sensors are often incremental, for very low angular velocities, it is important to increase the resolution of the absolute position determination. Using the interpolation electronics for further processing of the sin/cos signals, more accurate information about the absolute position, within already determined incremental position, can be obtained [7].…”

Section: Introductionmentioning

confidence: 99%

A Novel Linearization Method of Sin/Cos Sensor Signals Used for Angular Position Determination

Živanović¹,

Lukić²,

Denić³

2014

Journal of Electrical Engineering and Technology

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-In this paper a novel method for angular position determination using sensors with sin / cos output and without an excitation signal, is presented. The linearization of the sensor transfer characteristic and digitalization of the measurement results are performed simultaneously with a goal to increase the measurement resolution. This improvement is particularly important for low angular velocities, and can be used to increase the resolution of incremental Hall, magnetic and optical sensors. This method includes two phases of sin/cos signal linearization. In the first linearization phase the pseudo-linear signal is generated. The second linearization phase, executed by the two-stage piecewise linear ADC, is an additional linearization of the pseudo-linear signal. Based on the LabVIEW software simulations of the proposed method, the contribution of each processing phase to a final measurement error is examined. After the proposed method is applied within 2π [rad] range, the maximal nonlinearity is reduced from 0.3307 [rad] (18.9447°) to 3·10 -4 [rad] (0.0172°).

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New interpolation method for quadrature encoder signals

Cited by 99 publications

References 11 publications

A Novel Quadrature Signal Estimation Method for a Planar Capacitive Incremental Displacement Sensor

A Novel Quadrature Signal Estimation Method for a Planar Capacitive Incremental Displacement Sensor

Online Estimation and Correction of Systematic Encoder Line Errors

A Novel Linearization Method of Sin/Cos Sensor Signals Used for Angular Position Determination

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