A Novel Algorithm Based on Polynomial Approximations for an Efficient Error Compensation of Magnetic Analog Encoders in PMSMs for EVs

Lara, Jorge; Xu, Jianhong; Chandra, Ambrish

doi:10.1109/tie.2016.2524409

Cited by 51 publications

(24 citation statements)

References 39 publications

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“…The techniques proposed herein to reduce the impact of position error are not specific to any particular manufacturing imperfection in the resolver. Comparing with the earlier works [15], [16] Though this research was mainly focused on mitigating the dc-link oscillations caused solely due to resolver error, the impact of other possible external disturbances on the system has been analyzed, and it has been concluded that the position error has the most significant impact compared to other disturbances.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Mitigation of DC-Link Voltage Oscillations Caused by Resolver Error in an Electric Vehicle Drivetrain

Sayed

Aliprantis

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

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Resolvers are commonly used to measure the rotor position in motor drive applications. However, manufacturing imperfections introduce a position measurement error, which manifests itself as relatively small oscillations primarily at the fundamental and second harmonic frequencies. This affects the field orientation control in machines, leading to oscillations in currents and electromagnetic torque. This research focuses on the impact of position error in a series-hybrid drivetrain architecture. In this topology, substantial oscillations in dc-link voltage are induced, which are further exacerbated by reducing the dc-link capacitance in a bid to lower the overall inverter size and weight. This work sets forth various methods to mitigate the aforementioned dc-link oscillations based on control modifications. To this end, a linearized small-signal detailed model of the drivetrain is developed first to support the analysis of the phenomenon. The effectiveness of these techniques is validated by analytical and experimental results.

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Section: Discussionmentioning

confidence: 99%

“…However the technique proposed needs to be implemented in the R/D. In [16], an algorithm for compensating the errors in modulated signals of the resolver is presented. This method first demodulates the resolver signals and computes the error by comparing with the ideal signals.…”

Section: Literature Surveymentioning

confidence: 99%

Mitigation of DC-Link Voltage Oscillations Caused by Resolver Error in an Electric Vehicle Drivetrain

Sayed

Aliprantis

et al. 2018

2018 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

show abstract

“…However, harmonic phase estimation is the obstacle for rejection in the real system. An advantage of the harmonic rejection in the proposed scheme is that it can reject both the dc-offset of sinusoidal signals, as well as the amplitude mismatch, which is converted to harmonics in the phase detector error [29].…”

Section: A Experiments Systemmentioning

confidence: 99%

A Stable Adaptive Gradient Descent Harmonic-Disturbance Rejection for Improving Phase-Tracking Accuracy

et al. 2020

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This paper proposes a stable adaptive gradient descent for harmonic-disturbance rejection as a tool for grid-power signal processing, magnetic rotary encoders, and permanent-magnet synchronous motors. The method can be widely applied to increase the accuracy of phase or position estimation in various systems in which harmonic disturbances exist. The proposed technique is based on learning the harmonic amplitudes by means of gradient descent on the feedback phase error. To compensate for the disadvantages of existing gradient-descent methods, the derivative expansion is fully developed with system transfer function integration for stable weighting update. In addition, an adaptive learning rate is also proposed based on discrete Lyapunov standard to achieve stability, and theoretical analysis is discussed. The performance of the method is evaluated by numerical simulation in MATLAB with various scenarios, and by the experiment with the rotary magnetic encoders. The results show that the proposed method achieves stability and high performance in harmonic rejection.

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“…A novel algorithm based on polynomial approximations (PA) is proposed; this algorithm is used for an efficient error compensation of magnetic analog encoders. The proposed PA algorithm assisted with the phase-locked loop is capable of reducing the total position error to a range as small as ±0.2° [15]. A subdivision method based on software frequency doubling is proposed.…”

Section: Introductionmentioning

confidence: 99%

Suppression Method of Jump Points for Multipole Magnetic Encoder at Low Temperature Based on Single-Pole Angle Value Fitting

et al. 2019

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To eliminate the jump points of multipole angle values after subdivision at low temperature, the magnetic field and temperature field characteristics of a multipole magnetic encoder are analyzed in this study, and the effect of changes in magnetic field strength and temperature field on the precision of angle values is studied. To eliminate the jump point of multipole angle values caused by changes in the temperature field, the suppression method based on single-pole angle value fitting is proposed. The error between the single-pole and multipole angle values is tabulated by the oversampling linear interpolation method, and the precision of fitting single-pole to multipole angle values is effectively improved. The error of the angle value caused by changes in the temperature field is studied and analyzed, and the relationship between the jump angle values and the pole number of the multipole magnetic encoder is obtained. Furthermore, the jump point is compensated for by the jump range of the multipole angle values. Finally, the angle accuracy of the multipole magnetic encoder in a cryogenic chamber is experimentally verified. The experimental results show that the low-temperature jump point compensation method proposed for the multipole magnetic encoder in this paper can effectively suppress the jump of the angle values.

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A Novel Algorithm Based on Polynomial Approximations for an Efficient Error Compensation of Magnetic Analog Encoders in PMSMs for EVs

Cited by 51 publications

References 39 publications

Mitigation of DC-Link Voltage Oscillations Caused by Resolver Error in an Electric Vehicle Drivetrain

Mitigation of DC-Link Voltage Oscillations Caused by Resolver Error in an Electric Vehicle Drivetrain

A Stable Adaptive Gradient Descent Harmonic-Disturbance Rejection for Improving Phase-Tracking Accuracy

Suppression Method of Jump Points for Multipole Magnetic Encoder at Low Temperature Based on Single-Pole Angle Value Fitting

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