Levitation of a flexible rotor supported by hybrid magnetic bearings

Recently, it has become necessary for rotors of centrifugal compressors, industrial rolls, and other devices to be less weighted, have a long span, and operate at high rotation speed to increase productivity. Such rotors are more likely to have a high order mode than other types of rotors at the sam...

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Autores principales:	Nozomu ISHIKAWA, Satoshi UENO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	high order mode hybrid active magnetic bearing flexible rotor levitation control notch filter Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/8e8ba159ac5d41b2a723d826e3fd1a3c
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spelling	oai:doaj.org-article:8e8ba159ac5d41b2a723d826e3fd1a3c2021-11-26T06:27:48ZLevitation of a flexible rotor supported by hybrid magnetic bearings2187-974510.1299/mej.14-00564https://doaj.org/article/8e8ba159ac5d41b2a723d826e3fd1a3c2015-06-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/4/2_14-00564/_pdf/-char/enhttps://doaj.org/toc/2187-9745Recently, it has become necessary for rotors of centrifugal compressors, industrial rolls, and other devices to be less weighted, have a long span, and operate at high rotation speed to increase productivity. Such rotors are more likely to have a high order mode than other types of rotors at the same rotational speed, and may become unstable. To solve this problem, active magnetic bearings are used to support the flexible rotor. However, because a general active magnetic bearing uses bias current to control the bearing force, it consumes a large amount of electricity. To reduce power consumption, a hybrid active magnetic bearing (HAMB) that consists of electromagnets and permanent magnets is used. The HAMB fabricated in this work has negative stiffness in both radial and angular directions. Two HAMBs, one at each end of a flexible rotor arranged horizontally, are installed to levitate it. A PID controller with a notch filter is used to control levitation. With only a PID controller, levitation of the flexible rotor becomes unstable because the flexible mode stimulates vibration. To settle the flexible mode vibrations, the notch filter is designed at the frequency of the flexible mode. Applying the notch filter to the displacement control loop has little effect on vibration decrement, whereas applying it against the angle control loop produces a remarkable effect. Therefore, the notch filter is applied only to the angle control loop. A rotation test is then implemented. The experimental results show that the HAMB-based control system stably passes through the second flexible mode rotation speed. Then, by using the advantage of the HAMB to reduce power consumption effectively, the ability of the system to reduce the control current to use zero power control is demonstrated, and, the results are compared with PID control when levitating the flexible rotor. Furthermore, a levitation test is conducted with linear quadratic regulator control.Nozomu ISHIKAWASatoshi UENOThe Japan Society of Mechanical Engineersarticlehigh order modehybrid active magnetic bearingflexible rotorlevitation controlnotch filterMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 4, Pp 14-00564-14-00564 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	high order mode hybrid active magnetic bearing flexible rotor levitation control notch filter Mechanical engineering and machinery TJ1-1570
spellingShingle	high order mode hybrid active magnetic bearing flexible rotor levitation control notch filter Mechanical engineering and machinery TJ1-1570 Nozomu ISHIKAWA Satoshi UENO Levitation of a flexible rotor supported by hybrid magnetic bearings
description	Recently, it has become necessary for rotors of centrifugal compressors, industrial rolls, and other devices to be less weighted, have a long span, and operate at high rotation speed to increase productivity. Such rotors are more likely to have a high order mode than other types of rotors at the same rotational speed, and may become unstable. To solve this problem, active magnetic bearings are used to support the flexible rotor. However, because a general active magnetic bearing uses bias current to control the bearing force, it consumes a large amount of electricity. To reduce power consumption, a hybrid active magnetic bearing (HAMB) that consists of electromagnets and permanent magnets is used. The HAMB fabricated in this work has negative stiffness in both radial and angular directions. Two HAMBs, one at each end of a flexible rotor arranged horizontally, are installed to levitate it. A PID controller with a notch filter is used to control levitation. With only a PID controller, levitation of the flexible rotor becomes unstable because the flexible mode stimulates vibration. To settle the flexible mode vibrations, the notch filter is designed at the frequency of the flexible mode. Applying the notch filter to the displacement control loop has little effect on vibration decrement, whereas applying it against the angle control loop produces a remarkable effect. Therefore, the notch filter is applied only to the angle control loop. A rotation test is then implemented. The experimental results show that the HAMB-based control system stably passes through the second flexible mode rotation speed. Then, by using the advantage of the HAMB to reduce power consumption effectively, the ability of the system to reduce the control current to use zero power control is demonstrated, and, the results are compared with PID control when levitating the flexible rotor. Furthermore, a levitation test is conducted with linear quadratic regulator control.
format	article
author	Nozomu ISHIKAWA Satoshi UENO
author_facet	Nozomu ISHIKAWA Satoshi UENO
author_sort	Nozomu ISHIKAWA
title	Levitation of a flexible rotor supported by hybrid magnetic bearings
title_short	Levitation of a flexible rotor supported by hybrid magnetic bearings
title_full	Levitation of a flexible rotor supported by hybrid magnetic bearings
title_fullStr	Levitation of a flexible rotor supported by hybrid magnetic bearings
title_full_unstemmed	Levitation of a flexible rotor supported by hybrid magnetic bearings
title_sort	levitation of a flexible rotor supported by hybrid magnetic bearings
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/8e8ba159ac5d41b2a723d826e3fd1a3c
work_keys_str_mv	AT nozomuishikawa levitationofaflexiblerotorsupportedbyhybridmagneticbearings AT satoshiueno levitationofaflexiblerotorsupportedbyhybridmagneticbearings
_version_	1718409792374964224

Levitation of a flexible rotor supported by hybrid magnetic bearings

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