Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System

Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional loss...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Seng-Chi Chen [verfasserIn] Dinh-Kha Le [verfasserIn] Van-Sum Nguyen [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2014

Schlagwörter:	displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB

Übergeordnetes Werk:	In: Sensors - MDPI AG, 2003, 14(2014), 7, Seite 12640-12657
Übergeordnetes Werk:	volume:14 ; year:2014 ; number:7 ; pages:12640-12657

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/s140712640

Katalog-ID:	DOAJ079138411

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520			\|a Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested.
650		4	\|a displacement measurement
650		4	\|a notch filter
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allfields	10.3390/s140712640 doi (DE-627)DOAJ079138411 (DE-599)DOAJc259c957e72e41a493f35758e54e2f03 DE-627 ger DE-627 rakwb eng TP1-1185 Seng-Chi Chen verfasserin aut Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested. displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology Dinh-Kha Le verfasserin aut Van-Sum Nguyen verfasserin aut In Sensors MDPI AG, 2003 14(2014), 7, Seite 12640-12657 (DE-627)331640910 (DE-600)2052857-7 14248220 nnns volume:14 year:2014 number:7 pages:12640-12657 https://doi.org/10.3390/s140712640 kostenfrei https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 kostenfrei http://www.mdpi.com/1424-8220/14/7/12640 kostenfrei https://doaj.org/toc/1424-8220 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2111 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2014 7 12640-12657
spelling	10.3390/s140712640 doi (DE-627)DOAJ079138411 (DE-599)DOAJc259c957e72e41a493f35758e54e2f03 DE-627 ger DE-627 rakwb eng TP1-1185 Seng-Chi Chen verfasserin aut Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested. displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology Dinh-Kha Le verfasserin aut Van-Sum Nguyen verfasserin aut In Sensors MDPI AG, 2003 14(2014), 7, Seite 12640-12657 (DE-627)331640910 (DE-600)2052857-7 14248220 nnns volume:14 year:2014 number:7 pages:12640-12657 https://doi.org/10.3390/s140712640 kostenfrei https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 kostenfrei http://www.mdpi.com/1424-8220/14/7/12640 kostenfrei https://doaj.org/toc/1424-8220 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2111 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2014 7 12640-12657
allfields_unstemmed	10.3390/s140712640 doi (DE-627)DOAJ079138411 (DE-599)DOAJc259c957e72e41a493f35758e54e2f03 DE-627 ger DE-627 rakwb eng TP1-1185 Seng-Chi Chen verfasserin aut Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested. displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology Dinh-Kha Le verfasserin aut Van-Sum Nguyen verfasserin aut In Sensors MDPI AG, 2003 14(2014), 7, Seite 12640-12657 (DE-627)331640910 (DE-600)2052857-7 14248220 nnns volume:14 year:2014 number:7 pages:12640-12657 https://doi.org/10.3390/s140712640 kostenfrei https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 kostenfrei http://www.mdpi.com/1424-8220/14/7/12640 kostenfrei https://doaj.org/toc/1424-8220 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2111 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2014 7 12640-12657
allfieldsGer	10.3390/s140712640 doi (DE-627)DOAJ079138411 (DE-599)DOAJc259c957e72e41a493f35758e54e2f03 DE-627 ger DE-627 rakwb eng TP1-1185 Seng-Chi Chen verfasserin aut Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested. displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology Dinh-Kha Le verfasserin aut Van-Sum Nguyen verfasserin aut In Sensors MDPI AG, 2003 14(2014), 7, Seite 12640-12657 (DE-627)331640910 (DE-600)2052857-7 14248220 nnns volume:14 year:2014 number:7 pages:12640-12657 https://doi.org/10.3390/s140712640 kostenfrei https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 kostenfrei http://www.mdpi.com/1424-8220/14/7/12640 kostenfrei https://doaj.org/toc/1424-8220 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2111 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2014 7 12640-12657
allfieldsSound	10.3390/s140712640 doi (DE-627)DOAJ079138411 (DE-599)DOAJc259c957e72e41a493f35758e54e2f03 DE-627 ger DE-627 rakwb eng TP1-1185 Seng-Chi Chen verfasserin aut Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested. displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology Dinh-Kha Le verfasserin aut Van-Sum Nguyen verfasserin aut In Sensors MDPI AG, 2003 14(2014), 7, Seite 12640-12657 (DE-627)331640910 (DE-600)2052857-7 14248220 nnns volume:14 year:2014 number:7 pages:12640-12657 https://doi.org/10.3390/s140712640 kostenfrei https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 kostenfrei http://www.mdpi.com/1424-8220/14/7/12640 kostenfrei https://doaj.org/toc/1424-8220 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2057 GBV_ILN_2111 GBV_ILN_2507 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 14 2014 7 12640-12657
language	English
source	In Sensors 14(2014), 7, Seite 12640-12657 volume:14 year:2014 number:7 pages:12640-12657
sourceStr	In Sensors 14(2014), 7, Seite 12640-12657 volume:14 year:2014 number:7 pages:12640-12657
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB Chemical technology
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container_title	Sensors
authorswithroles_txt_mv	Seng-Chi Chen @@aut@@ Dinh-Kha Le @@aut@@ Van-Sum Nguyen @@aut@@
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callnumber-first	T - Technology
author	Seng-Chi Chen
spellingShingle	Seng-Chi Chen misc TP1-1185 misc displacement measurement misc notch filter misc natural frequency misc inductive displacement sensors misc lock-in amplifier misc AMB misc Chemical technology Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System
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topic_title	TP1-1185 Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System displacement measurement notch filter natural frequency inductive displacement sensors lock-in amplifier AMB
topic	misc TP1-1185 misc displacement measurement misc notch filter misc natural frequency misc inductive displacement sensors misc lock-in amplifier misc AMB misc Chemical technology
topic_unstemmed	misc TP1-1185 misc displacement measurement misc notch filter misc natural frequency misc inductive displacement sensors misc lock-in amplifier misc AMB misc Chemical technology
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title	Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System
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title_full	Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System
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title_sort	inductive displacement sensors with a notch filter for an active magnetic bearing system
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title_auth	Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System
abstract	Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested.
abstractGer	Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested.
abstract_unstemmed	Active magnetic bearing (AMB) systems support rotating shafts without any physical contact, using electromagnetic forces. Each radial AMB uses two pairs of electromagnets at opposite sides of the rotor. This allows the rotor to float in the air gap, and the machine to operate without frictional losses. In active magnetic suspension, displacement sensors are necessary to detect the radial and axial movement of the suspended object. In a high-speed rotating machine equipped with an AMB, the rotor bending modes may be limited to the operating range. The natural frequencies of the rotor can cause instability. Thus, notch filters are a useful circuit for stabilizing the system. In addition, commercial displacement sensors are sometimes not suitable for AMB design, and cannot filter the noise caused by the natural frequencies of rotor. Hence, implementing displacement sensors based on the AMB structure is necessary to eliminate noises caused by natural frequency disturbances. The displacement sensor must be highly sensitive in the desired working range, and also exhibit a low interference noise, high stability, and low cost. In this study, we used the differential inductive sensor head and lock-in amplifier for synchronous demodulation. In addition, an active low-pass filter and a notch filter were used to eliminate disturbances, which caused by natural frequencies. As a consequence, the inductive displacement sensor achieved satisfactory linearity, high sensitivity, and disturbance elimination. This sensor can be easily produced for AMB applications. A prototype of these displacement sensors was built and tested.
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title_short	Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System
url	https://doi.org/10.3390/s140712640 https://doaj.org/article/c259c957e72e41a493f35758e54e2f03 http://www.mdpi.com/1424-8220/14/7/12640 https://doaj.org/toc/1424-8220
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up_date	2024-07-03T21:55:13.526Z
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Inductive Displacement Sensors with a Notch Filter for an Active Magnetic Bearing System

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