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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.


Normalized distribution of harmonics.
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pone.0153255.g006: Normalized distribution of harmonics.

Mentions: The most significant harmonics are the ones which have the average value ≥ 0.5. For the specific case of the motor used in the experiments conducted within this study, the harmonics selected for compensation are 1, 3, 4, 5, 7, 8 and 16. These selected values were expected to be found, based on motor’s design parameters. The first harmonic represents the output of the mechanical beating phenomenon; the 4th harmonic has as a source the 4 brushes of the motor; the 8th harmonic is dominant because of the 8 magnetic poles. Taking into consideration the principle of superposition and amplitude modulation, harmonics 3, 5 and 7 can be consequently be explained. Thus, in Fig 6 which presents the distribution of the normalized harmonic values, it can be seen that the selected harmonics pass well over the 0.5 limit and are suitable to be minimized.


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

Roșca L, Duguleană M - PLoS ONE (2016)

Normalized distribution of harmonics.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0153255.g006: Normalized distribution of harmonics.
Mentions: The most significant harmonics are the ones which have the average value ≥ 0.5. For the specific case of the motor used in the experiments conducted within this study, the harmonics selected for compensation are 1, 3, 4, 5, 7, 8 and 16. These selected values were expected to be found, based on motor’s design parameters. The first harmonic represents the output of the mechanical beating phenomenon; the 4th harmonic has as a source the 4 brushes of the motor; the 8th harmonic is dominant because of the 8 magnetic poles. Taking into consideration the principle of superposition and amplitude modulation, harmonics 3, 5 and 7 can be consequently be explained. Thus, in Fig 6 which presents the distribution of the normalized harmonic values, it can be seen that the selected harmonics pass well over the 0.5 limit and are suitable to be minimized.

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.