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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.


System architecture.
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pone.0153255.g003: System architecture.

Mentions: The proposed algorithm presented in Fig 3 expands the diagram from Fig 1. The “Online Observer” block acts as a buffer between the input and the DC motor. First, all harmonics are analyzed offline, based on the output given by the “Frequency domain analyzer” block, after a fast Fourier computation, residues removal and normalization. The most significant ones are selected in “Harmonic Selection” block, and offered for online filtering, process that happens within the “Filter” block. The system runs through a continuous optimization loop created between the, “Filter”, “Estimation”, “Compensation” and “DC motor” blocks. The compensating harmonics that are meant to attenuate the most significant harmonics are estimated in “Estimation” block and sent to “Compensation” block. Thus, the proposed algorithm has certain similarities with harmonic injection and observer/estimation techniques. The process happens continuously, as the output from the DC motor is sent back to the “Online Observer”. The pulsating torque minimization process is thus separated in 2 distinct phases: the offline loop which runs for a while before calculating the required data, and the online compensation which starts after the calculation is completed.


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

Roșca L, Duguleană M - PLoS ONE (2016)

System architecture.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0153255.g003: System architecture.
Mentions: The proposed algorithm presented in Fig 3 expands the diagram from Fig 1. The “Online Observer” block acts as a buffer between the input and the DC motor. First, all harmonics are analyzed offline, based on the output given by the “Frequency domain analyzer” block, after a fast Fourier computation, residues removal and normalization. The most significant ones are selected in “Harmonic Selection” block, and offered for online filtering, process that happens within the “Filter” block. The system runs through a continuous optimization loop created between the, “Filter”, “Estimation”, “Compensation” and “DC motor” blocks. The compensating harmonics that are meant to attenuate the most significant harmonics are estimated in “Estimation” block and sent to “Compensation” block. Thus, the proposed algorithm has certain similarities with harmonic injection and observer/estimation techniques. The process happens continuously, as the output from the DC motor is sent back to the “Online Observer”. The pulsating torque minimization process is thus separated in 2 distinct phases: the offline loop which runs for a while before calculating the required data, and the online compensation which starts after the calculation is completed.

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.