Systematic error cancellations and fault detection of resolver angular sensors using a DSP based system

Sarma, Santanu; Venkateswaralu, A.

doi:10.1016/j.mechatronics.2009.09.002

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…Replacing (50)- (52) in (53) and applying trigonometry yield: where e θ (k) = θ(k) − θ e (k) is the angle estimation error, and assuming that e θ (k) ≈ 0, then sin(e θ (k)) ≈ e θ (k). Thus, (54) is rewritten as follows:…”

Section: Proposed Gpc-based Atomentioning

confidence: 99%

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Development of a Resolver-to-Digital Converter Based on Second-Order Difference Generalized Predictive Control

2021

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High-performance motor drives that operate in harsh conditions require an accurate and robust angular position measurement to correctly estimate the speed and reduce the torque ripple produced by angular estimation error. For that reason, a resolver is used in motor drives as a position sensor due to its robustness. A resolver-to-digital converter (RDC) is an observer used to get the angular position from the resolver signals. Most RDCs are based on angle tracking observers (ATOs). On the other hand, generalized predictive control (GPC) has become a powerful tool in developing controllers and observers for industrial applications. However, no GPC-based RDC with zero steady-state error during constant speed operation has been proposed. This paper proposes an RDC based on the second-order difference GPC (SOD-GPC). In SOD-GPC, the second-order difference operator is applied to design a GPC model with two embedded integrators. Thus, the SOD-GPC is used to design a type-II ATO whose steady-state angle estimation error tends to zero during constant speed operation. Simulation and experimental results prove that the proposed RDC system has better performance than other literature approaches.

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Section: Proposed Gpc-based Atomentioning

confidence: 99%

“…Equations 2and 3are the ideal representation of the resolver outputs. However, imperfections in the mechanical resolver structure and the signal conditioning circuits introduce distortions to the resolver outputs [52][53][54][55]. The main distortions that affect the angle estimation are:…”

Section: Effect Of Resolver Parameter Variations In the Angle Estimationmentioning

confidence: 99%

Development of a Resolver-to-Digital Converter Based on Second-Order Difference Generalized Predictive Control

2021

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“…Finite Impulse Response filter was applied in a self-tuning circuit [15], which reduced noise but had an inherent time delay and phase distortion. An adaptive phase-locked loop proposed in Reference [16] was able to filter noise online to a certain extent. However, the continuous calibration increased the unnecessary delay with the errors supposed constant in a short time.…”

Section: Introductionmentioning

confidence: 99%

Noise Reduction for High-Accuracy Automatic Calibration of Resolver Signals via DWT-SVD Based Filter

Guo

2019

Electronics

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High-accuracy calibration of resolver signals is the key to improve its angular measurement accuracy. However, inductive harmonics, residual excitation components, and random noise in signals dramatically restrict the further improvement of calibration accuracy. Aiming to reduce these unexpected noises, a filter based on discrete wavelet transform (DWT) and singular value decomposition (SVD) is designed in this paper. Firstly, the signal was decomposed into a time-frequency domain by DWT and several groups of coefficients were obtained. Next, the SVD operation of a Hankel matrix created from the coefficients was made. Afterwards, the noises were attenuated by reconstructing the signal with a few selected singular values. Compared with a conventional low-pass filter, this method can almost only preserve the fundamental and DC components of the signal because of the multi-resolution characteristic of DWT and the good correspondence between the singular value and frequency. Therefore, the calibration accuracy of the imperfect characteristics could be improved effectively. Simulation and experimental results demonstrated the effectiveness of the proposed method.

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“…Besides common advantages inductive sensors have, this sensor has other advantages compared with traditional angular displacement sensors, e.g., resolvers and round inductosyns. Resolvers have trouble to make uniform coils, especially complex coils to overcome harmonics [22]- [24] introduced by sensor mechanical structure or unsymmetrical coils or excitations. Though inductosyns have no trouble like resolvers, they have very weak output voltage [25], [26] which is even in microvolt scale, as a result electrical part has heavy work to get smooth signals from sensor output signals.…”

Section: Introductionmentioning

confidence: 99%

An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

Tang

Peng

et al. 2015

IEEE Sensors J.

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This paper introduces a noncontact, low-cost, and reliable inductive sensor for angular displacement measurement. It is suitable to work in harsh industrial environments. The sensor has simple structure consisting of three key parts: 1) a ferromagnetic stator, which is a pure plane; 2) a ferromagnetic rotor, which has face slots; and 3) four layers of planar copper coils, including primary and secondary coils. Primary coils are supplied with two orthogonal 4000-Hz ac, and secondary coils output a signal whose phase is proportional to angular displacement. Primary coils are designed with sinusoidal shape, so that magnetic field between the stator and rotor has approximately sinusoidal distribution, and finally linearity between the phase variation of output signal and angular displacement is well helped by this design. The structure and working principles of the sensor are explained in detail. Moreover, a sensor model was simulated to verify the feasibility of the sensor working principles and a sensor prototype was designed for actual experiment. At last actual experiment results are given and analyzed, showing that the sensor prototype has achieved accuracy better than ±12 arcsec in the range of 0°-360°, and this kind of sensor may have a better performance by improving the layout of primary coils and front-end signal-process circuit.Index Terms-Non-contact inductive sensor, angular displacement, planar coils, contrate rotor, sinusoidal shape.

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Systematic error cancellations and fault detection of resolver angular sensors using a DSP based system

Cited by 16 publications

References 11 publications

Development of a Resolver-to-Digital Converter Based on Second-Order Difference Generalized Predictive Control

Development of a Resolver-to-Digital Converter Based on Second-Order Difference Generalized Predictive Control

Noise Reduction for High-Accuracy Automatic Calibration of Resolver Signals via DWT-SVD Based Filter

An Inductive Angular Displacement Sensor Based on Planar Coil and Contrate Rotor

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