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Research Papers: Gas Turbines: Structures and Dynamics

Active Vibration Control of the Flexible Rotor in High Energy Density Magnetically Suspended Motor With Mode Separation Method

[+] Author and Article Information
Enqiong Tang

Science and Technology on Inertial Laboratory,
Beihang University,
Shining Building 403,
Xueyuan Road,
Beijing 100191, China
e-mail: tang.forever@163.com

Jiancheng Fang

Professor
Science and Technology on Inertial Laboratory,
Beihang University,
Shining Building 403, Xueyuan Road,
Beijing 100191, China
e-mail: Fangjiancheng@buaa.edu.cn

Bangcheng Han

Science and Technology on Inertial Laboratory,
Beihang University,
Shining Building 403,
Xueyuan Road,
Beijing 100191, China
e-mail: hanbangcheng@buaa.edu.cn

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 10, 2014; final manuscript received December 4, 2014; published online January 28, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(8), 082503 (Aug 01, 2015) (10 pages) Paper No: GTP-14-1573; doi: 10.1115/1.4029372 History: Received October 10, 2014; Revised December 04, 2014; Online January 28, 2015

Since the mass of the rotor in high energy density magnetically suspended motor (HEDMSM) is always large and there are only three balancing planes on the flexible rotor restricted by the structure of the motor, which means that the second bending mode cannot be balanced using N + 1 planes method which is always applied to balance the flexible rotor. Then, the rotor displacements maybe large and this situation will make the system consume large amplifier currents when the rotor passes the first bending critical speed. Therefore, the mode separation method is proposed to separate the first and the second bending modes in rotor displacement and reconstruct the displacement signal nearby the first bending mode. Then, the original rotor displacement signal used by the digital controller is substituted by the reconstructed displacement signal and the amplifier current is reduced a lot when the rotor passes the first bending critical speed. Finally, the experiment of mode separation is carried out in 100 kW magnetically suspended motor and the experiment results show the effectiveness and superiority of the mode separation method in reducing the amplifier current when the rotor passes the first bending critical speed.

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References

Figures

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Fig. 1

The sketch map of the magnetically suspended motor

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Fig. 2

The rotor displacements with run-up test before and after balancing of the second bending mode

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Fig. 3

The saturation characteristics of the amplifier current

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Fig. 4

The rotor finite element model with n segments

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Fig. 5

The first three bending mode shape of the flexible rotor

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Fig. 6

The block diagram of the rotor-MB system

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Fig. 7

Schematic diagram of switching power amplifier

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Fig. 8

Bode plots of power amplifier from amplifier reference input to AMB amplifier current output

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Fig. 9

The first two bending mode shape of the flexible rotor

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Fig. 11

The complete control system with mode separation method

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Fig. 10

The sketch map of the mode separation method

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Fig. 12

The experimental system of the magnetically suspended motor. (1) Magnetically suspended motor, (2) rotor, (3) power supply 48 V, (4) power supply 90 V, (5) control system and power amplifier, (6) oscilloscope, and (7) UPS.

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Fig. 15

The amplifier current amplitude in run-up experiment. (a) The current amplitude of ax direction of the rotor and (b) the current amplitude of bx direction of the rotor.

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Fig. 16

The rotor displacements and amplifier currents in run-up experiment before and after using mode separation method

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Fig. 13

The experiment of mode separation method at Ω = 192 Hz (ε = 50). (a) Original displacement signal hax and rotation speed synchronous signals Sax. (b) Original displacement signal hbx and rotation speed synchronous signals Sbx. (c) First bending mode displacements Sax1 and Sbx1 extracted from original displacement signal. (d) Second bending mode displacements Sax1 and Sbx1 extracted from original displacement signal.

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Fig. 14

The rotor displacements amplitude in run-up experiment. (a) The displacements amplitude of ax direction of the rotor and (b) the displacements amplitude of bx direction of the rotor.

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