An unified approach to controls for unbalanced compensation in active magnetic bearings

Mizuno, Takeshi

doi:10.1109/cca.1998.721620

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Mizuno, et al, proposed pole-zero cancellation compensation to realize displacement, current and force regulations [4]. A LQR scheme for vibration control in AMB system to reduce the unbalance vibrations is proposed by Arias, et al [5]. Moreover, iterative learning control is applied in the unbalance compensation for AMB system [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influences of Assault Blocks on Rotor Vibrations in AMB System

Zhu¹,

Zhang²

2015

TOEEJ

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In an active magnetic bearing (AMB) system, the rotor always rotates at extremely high speed which always accompany with huge vibrations and noises. Most of the former researches associated with reducing the rotor vibrations are mainly focused on the control methods of AMB. A new method of installing series of assault blocks in the rotor is proposed to reduce the rotor vibrations. Firstly, the dynamic models of rotor supported by AMB considering the influences of assault blocks are established. Then, both dynamic simulations with and without assault blocks are carried out separately using the real-time AMB support dynamic stiffness. The rotor vibration displacements are mainly analyzed. Finally, relevant experiments are made to verify the theoretical results. Both theoretical and experimental results validated the advantages of using assault blocks.

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Section: Introductionmentioning

confidence: 99%

Influences of Assault Blocks on Rotor Vibrations in AMB System

Zhu¹,

Zhang²

2015

TOEEJ

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“…Em [22] Finalmente o capítulo 7 apresenta as conclusões finais e sugestões para a continuidade da pesquisa.…”

Section: 34unclassified

Redução de vibrações de rotor usando regulação sincronizada.

Fernandes¹

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This work discusses about the theoretical analysis of the performance of synchronized regulation applied in reduction of rotor vibrations using magnetic bearings. Originally presented in the dissertation "Synchronized regulation of sinoidal disturbing", of Vaydia I. C. Segura, the regulator had its regulation module changed to work with multiple inputs and outputs, in addition to enabling real-time estimation of the influence matrix. The performance and robustness of the regulator were analyzed as a function of the parameters. The synchronized regulation was applied to the theoretical model developed by the finite elements method and simulated in a computer.

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“…Técnicas tradicionais de regulação não são efetivas para eliminar as vibrações devidas ao desbalanço do rotor, porque a regulação tradicional produz soluções sintonizadas com a rotação e pouco robustas com relação às incertezas no modelo da planta e à variação da frequência (MIZUNO, 1998). Técnicas de controle robusto, por sua vez, tornam difícil o problema de regulação devido ao fato de rotores possuírem frequências críticas incertas, problema que é agravado para a classe de rotores pouco amortecidos (ver capítulo 2).…”

Section: Introductionunclassified

Contribuições para o balanceamento eletrônico de rotores.

Perim¹

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This work is inserted in the context of active attenuation of rotor vibrations. These vibrations are caused by the rotor's own unbalance and have a frequency equal to the rotor's rotation frequency. The unbalance can be modeled as a rotating disturbance force, and a well-known technique for cancelling the effect of such a disturbance is the so-called active balancing, also known as synchronous unbalance compensation or synchronized regulation. The present dissertation brings two contributions to the theme. The first one is the simplification of the synchronous compensator through considerations of rotor symmetry and bearing isotropy, and the second one is to obtain the exact model of the discrete system resulting from the application of the synchronous compensation methodology. These contributions make use of the model described in complex coordinates. The transformation from real coordinates to complex coordinates is defined as a complexification. Thus, the complexification of the model allows the division in half of the dimension of the system variables (states, inputs and outputs), as well as giving a physical sense to the separation between forward disturbances (case of the rotor unbalance) and backward disturbances. This complexification reduces the time of identification of the influence matrix made in active balancing, and the complexified model obtained through symmetry and isotropy hypotheses allows the completely uncouple of the forward disturbances compensation from the backward disturbances compensation.

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An unified approach to controls for unbalanced compensation in active magnetic bearings

Cited by 4 publications

References 2 publications

Influences of Assault Blocks on Rotor Vibrations in AMB System

Influences of Assault Blocks on Rotor Vibrations in AMB System

Redução de vibrações de rotor usando regulação sincronizada.

Contribuições para o balanceamento eletrônico de rotores.

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