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An Online Observer for Minimization of Pulsating Torque in SMPM Motors.

Roșca L, Duguleană M - PLoS ONE (2016)

Bottom Line: Either the motor design or the motor control needs to be improved in order to minimize the periodic disturbances.The compensating signal is identified and added as feedback to the control signal of the servo motor.Compensation is evaluated for different values of the input signal, to show robustness of the proposed method.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering, University "Lucian Blaga" of Sibiu, Sibiu, Romania.

ABSTRACT
A persistent problem of surface mounted permanent magnet (SMPM) motors is the non-uniformity of the developed torque. Either the motor design or the motor control needs to be improved in order to minimize the periodic disturbances. This paper proposes a new control technique for reducing periodic disturbances in permanent magnet (PM) electro-mechanical actuators, by advancing a new observer/estimator paradigm. A recursive estimation algorithm is implemented for online control. The compensating signal is identified and added as feedback to the control signal of the servo motor. Compensation is evaluated for different values of the input signal, to show robustness of the proposed method.

No MeSH data available.


Online parameters estimation graphs for one filtered harmonic.
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pone.0153255.g013: Online parameters estimation graphs for one filtered harmonic.

Mentions: After assessing the offline results, the online algorithm is evaluated (see S4 and S5 Files). The input signal is the filtered harmonic from the real motor current. Estimation during a time length of 10 seconds is presented in Fig 13. The estimated amplitude and phase are reaching a steady state in about 1.5 seconds. This happens because of the input signal shape, which in the beginning is decreasing (due to the step of current). The error goes towards zero but never reaches it, because of the noisy input signal. Amplitude and phase are presenting some oscillations during estimation, due to the observation error which never gets to zero value. In noisy conditions, an update of the parameters is present in every iteration, thus explaining the ripples in parameter estimation graphs. Most importantly, the phase must have as little oscillations as possible, because a precise estimated phase is needed to avoid any shifting in the compensation process.


An Online Observer for Minimization of Pulsating Torque in SMPM Motors.

Roșca L, Duguleană M - PLoS ONE (2016)

Online parameters estimation graphs for one filtered harmonic.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835102&req=5

pone.0153255.g013: Online parameters estimation graphs for one filtered harmonic.
Mentions: After assessing the offline results, the online algorithm is evaluated (see S4 and S5 Files). The input signal is the filtered harmonic from the real motor current. Estimation during a time length of 10 seconds is presented in Fig 13. The estimated amplitude and phase are reaching a steady state in about 1.5 seconds. This happens because of the input signal shape, which in the beginning is decreasing (due to the step of current). The error goes towards zero but never reaches it, because of the noisy input signal. Amplitude and phase are presenting some oscillations during estimation, due to the observation error which never gets to zero value. In noisy conditions, an update of the parameters is present in every iteration, thus explaining the ripples in parameter estimation graphs. Most importantly, the phase must have as little oscillations as possible, because a precise estimated phase is needed to avoid any shifting in the compensation process.

Bottom Line: Either the motor design or the motor control needs to be improved in order to minimize the periodic disturbances.The compensating signal is identified and added as feedback to the control signal of the servo motor.Compensation is evaluated for different values of the input signal, to show robustness of the proposed method.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering, University "Lucian Blaga" of Sibiu, Sibiu, Romania.

ABSTRACT
A persistent problem of surface mounted permanent magnet (SMPM) motors is the non-uniformity of the developed torque. Either the motor design or the motor control needs to be improved in order to minimize the periodic disturbances. This paper proposes a new control technique for reducing periodic disturbances in permanent magnet (PM) electro-mechanical actuators, by advancing a new observer/estimator paradigm. A recursive estimation algorithm is implemented for online control. The compensating signal is identified and added as feedback to the control signal of the servo motor. Compensation is evaluated for different values of the input signal, to show robustness of the proposed method.

No MeSH data available.