Recently, applications of the reluctance torque motor have been quite limited due to their inherent limitation of noise and vibration and thus, researches on the reluctance motor have been limited as well. However, with the tremendous increase in the cost of rare earth material magnets, studies of t...
Recently, applications of the reluctance torque motor have been quite limited due to their inherent limitation of noise and vibration and thus, researches on the reluctance motor have been limited as well. However, with the tremendous increase in the cost of rare earth material magnets, studies of the reluctance torque motor are being conducted more and more. In principle, reluctance torque is generated when the inductance is changed. Therefore, in order to generate continuous torque in the switched reluctance motor, it is necessary to figure out the exact inductance level corresponding to the rotor position and the current level to be applied in that rotor position, respectively. If the current level or the rotor position is not accurately determined, then the generated reluctance torque becomes unstable and undesirable torque ripples prevail to eventually cause noise and vibrations. In this research, a flux switched reluctance motor (FSRM), which is classified into the switched reluctance motor (SRM), was studied. A methodology using the current shaping control according to the rotor position was proposed. Based on the proposed methodology, the optimal current waveform and the torque distribution function for the FSRM to minimize torque ripple was established and demonstrated in this paper.
Recently, applications of the reluctance torque motor have been quite limited due to their inherent limitation of noise and vibration and thus, researches on the reluctance motor have been limited as well. However, with the tremendous increase in the cost of rare earth material magnets, studies of the reluctance torque motor are being conducted more and more. In principle, reluctance torque is generated when the inductance is changed. Therefore, in order to generate continuous torque in the switched reluctance motor, it is necessary to figure out the exact inductance level corresponding to the rotor position and the current level to be applied in that rotor position, respectively. If the current level or the rotor position is not accurately determined, then the generated reluctance torque becomes unstable and undesirable torque ripples prevail to eventually cause noise and vibrations. In this research, a flux switched reluctance motor (FSRM), which is classified into the switched reluctance motor (SRM), was studied. A methodology using the current shaping control according to the rotor position was proposed. Based on the proposed methodology, the optimal current waveform and the torque distribution function for the FSRM to minimize torque ripple was established and demonstrated in this paper.
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제안 방법
A dynamometer with a 3 phase permanent magnet synchronous motor (PMSM) equipped with a torque sensor is prepared to experimentally evaluate the torque ripples of the developed FSRM and to validate the torque ripple reduction methodology for the FSRM. In order to minimize the torque ripples propagated from the load motor, the PMSM with torque ripples of less than 1% and the back EMF THD of less than 1% were used for this validation experiment.
In order to implement the proposed approach, namely to obtain the commanding current patterns to produce the torque outputs in which the ripples are minimized, the FSRM under consideration was modeled with Simulink® from Matlab®.
In this research paper, a very effective torque ripple reduction methodology for the FSRM, which typically has high torque ripples due to distorted and asymmetric back EMF signals, is suggested and the results from the validation experiments are provided. One of inherent issues in the proposed method is to compose the commanding current using the current patterns imposed with the higher harmonics.
Ultimately, the combined torque outputs in the shaft with the minimized torque ripples are achieved through the application of the commanding current multiplied by the TDF in respect to each rotor position. Later on, these commanding current patterns and the TDF are imbedded in the torque controller to produce the stable and constant torque outputs in the experimental validation test. In Fig.
In this research paper, a very effective torque ripple reduction methodology for the FSRM, which typically has high torque ripples due to distorted and asymmetric back EMF signals, is suggested and the results from the validation experiments are provided. One of inherent issues in the proposed method is to compose the commanding current using the current patterns imposed with the higher harmonics. In other words, a certain limitation in the proposed torque ripple reduction method would exist at high speed operation due to the limitation of the current response characteristics.
성능/효과
0 Nm. Based on results from the current validation experiments, the newly proposed control method achieved the torque ripple reduction of approximately 65.5% compared to the torque ripple from the conventional pulsed current control method. While this achievement in was quite phenomenal, the torque ripple was not removed completely.
참고문헌 (5)
T. H. Kim, Ph.D. thesis, "A Novel Design Method for Flux-Reversal Machine and Characteristics Analysis under PWM Drives", Hanyang University, Korea (2005).
Y-H. Kim, H-S. Lyoo, and J. Lee, "Advanced Torque Control of Switched Reluctance Motor", IEEE International Symposium on Industrial Electronics, 3, pp. 1798-1803 (2001).
A.M. Stankovic, G. Tadmor, and Z. Coric, "Low Torqueripple control of current-Fed Switched Reluctance Motors", IEEE Industrial Application Society Annual Meeting, pp. 84-91 (1996).
K. Russa, I. Husain, and Elbuluk, "Torque Ripple Minimization in Switched Reluctance Machines Over a Wide Speed Range", IEEE Industrial Application Society Annual Meeting, New Orleans, LA. pp. 668-675 (1997).
I. Husain and M. Ehsani, IEEE Trans. Power Electron. 11, 83 (1996).
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