A Fractional Delay Variable Frequency Repetitive Control for Torque Ripple Reduction in PMSMs

Tang, Mi; Gaeta, Alberto; Formentini, Andrea; Zanchetta, Pericle

doi:10.1109/tia.2017.2725824

Cited by 60 publications

(43 citation statements)

References 22 publications

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“…4. Again, the deadbeat current loop is implemented according to [12], the force estimator is as demonstrated in section IV, and the position-based RC shares the same equations with the angle-based RC in [13] (the mover displacement x is converted into an equivalent rotor position by times 2π/l, l is the full journey length of PMLSM).…”

Section: Simulation Resultsmentioning

confidence: 99%

“…when most of the time the speed is supposed to be constant, a position-based RC can be used. The implementation of RC can be found in [13], where an angle-based RC is proposed for rotational machines. This angle-based RC includes the time-to-angle conversion, main body of RC, and angle-totime conversion.…”

Section: Design Of Rc With Dbccmentioning

confidence: 99%

“…when the mechanical position equals to 2π/N, 4π/N, , 2π), length N of the delay chain for the traditional RC becomes therefore the number of the memory locations, which does not need to be changed when the rotor speed changes. The same equations of the angle-based RC in [13] can be applied for the PMLSM if converts the mover displacement x into an equivalent rotor position (i.e. 2πx/l, where l is the full journey length (m) of the PMLSM).…”

Section: Design Of Rc With Dbccmentioning

confidence: 99%

“…It is also worth noting that the implementation of phase lead compensator z 2 in the angle-domain requires future position of the mover. The future position is predicted (as in [13]) using the speed feedback by assuming speed to be constant during the next 2T s .…”

Section: Design Of Rc With Dbccmentioning

confidence: 99%

See 3 more Smart Citations

The design of a position-based repetitive control for speed ripple reduction in PMLSMs

Tang

Formentini

Odhano

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Periodic speed errors can occur in permanent magnet linear synchronous machines for two reasons: 1) a periodic reference signal; 2) cogging force and friction. For reducing such periodic errors, iterative learning control or repetitive control approaches, used in conjunction with more common control actions, can be strongly effective. However, the design of the stability filter, robustness filter and other parameters for a traditional repetitive controller can be a complex task and may need to be adjusted when the frequency of such periodic error varies. Existing solutions tend to develop more adaptive tuning methods for repetitive controller to enhance the whole control system. This paper shows that the performance of a traditional speed loop can be enhanced with a repetitive controller without complicating the tuning of the repetitive controller. Consequently, a position-based repetitive control combined with deadbeat current control method is proposed. Simulation results show that the proposed method is effective for reducing speed ripple at difference frequencies without necessarily adjusting its parameters.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Design Of Rc With Dbccmentioning

confidence: 99%

Section: Design Of Rc With Dbccmentioning

confidence: 99%

Section: Design Of Rc With Dbccmentioning

confidence: 99%

See 2 more Smart Citations

The design of a position-based repetitive control for speed ripple reduction in PMLSMs

Tang

Formentini

Odhano

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

Self Cite

View full text Add to dashboard Cite

show abstract

“… Since torque disturbance [7] is often present even for a healthy motor due to harmonics in the inverter, cogging effect, non-sinusoidal flux distribution, current sensor offsets/scaling errors and mechanical misalignments, the RO can be used also in the healthy condition, and once the demagnetization is happened, the RO can adapt itself and maintains the high performance. Hence, the faulttolerance capability and robustness of the PMSM can be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Reuse of a Damaged Permanent Magnet Synchronous Motor for Torque Ripple and Acoustic Noise Elimination using a Novel Repetitive Observer

Tang

Odhano

Formentini

et al. 2020

IEEE Trans. on Ind. Applicat.

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A permanent magnet synchronous motor (PMSM) has its bearing damaged and is irreversibly demagnetized due to overcurrent. Due to the changes in its electromagnetic configuration, the motor suffers from extremely high torque ripple, which produces intolerable speed ripple and acoustic noise. The aim of this paper is to evaluate if a repetitive observer (RO) can be used to smooth the rotational speed and suppress acoustic noise. The RO is functionally the same as a repetitive controller (RC), but is preferred due to its simplicity of tuning. Its effectiveness of reducing acoustic noise will be evaluated in this paper for the first time. Experimental test results show that the speed ripple and acoustic noise are reduced significantly. The work opens the possibility of reusing the damaged motor and still achieve high performance. The RO can also be applied to enhance the fault tolerance capability of a healthy motor.

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Adaptive steering‐based HDTC algorithm for PMSM

Adam

Elnady

2019

Asian Journal of Control

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This paper introduces sensorless hysteresis direct torque control for permanent magnet synchronous motors to provide a reduced torque pulsation profile, which leads to a smaller mechanical vibration. The suggested algorithm utilizes the principle of vehicle steering, which continuously fixes the direction of the vehicle in the track. Moreover, the algorithm efficiently employs the output of torque and the output of flux error controllers used in basic hysteresis direct torque control to select two nonzero adjacent vectors. The initial switching time for the selected vectors is determined by a function that considers the absolute magnitude of the torque error and the magnitude of the flux error in addition to the space angle position of the stator flux. To reduce the processing time in the control signal flow, a suggested structure for switching the initial time of the selected vectors is developed. The final switching time of the vectors is adaptively adjusted according to the minimum required stator voltage to drive the load and according to the stored rotor energy that arises due to the inertia of the mechanical load connected to the motor shaft. The simulation results along with the experimental results show a fast dynamic response of torque, relatively reduced torque ripples, and reduced current harmonics compared to the basic hysteresis direct torque control.

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A Fractional Delay Variable Frequency Repetitive Control for Torque Ripple Reduction in PMSMs

Cited by 60 publications

References 22 publications

The design of a position-based repetitive control for speed ripple reduction in PMLSMs

The design of a position-based repetitive control for speed ripple reduction in PMLSMs

Reuse of a Damaged Permanent Magnet Synchronous Motor for Torque Ripple and Acoustic Noise Elimination using a Novel Repetitive Observer

Adaptive steering‐based HDTC algorithm for PMSM

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