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Control designs for low-loss active ...

Wilson, Brian Christopher David.

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Control designs for low-loss active magnetic bearings: Theory and implementation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Control designs for low-loss active magnetic bearings: Theory and implementation./
作者:	Wilson, Brian Christopher David.
面頁冊數:	353 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1484.
Contained By:	Dissertation Abstracts International65-03B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3126752

Control designs for low-loss active magnetic bearings: Theory and implementation.
Wilson, Brian Christopher David.

Control designs for low-loss active magnetic bearings: Theory and implementation. - 353 p.

Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1484.

Thesis (Ph.D.)--Georgia Institute of Technology, 2004.

Active Magnetic Bearings (AMB) have been proposed for use in Electromechanical Flywheel Batteries. In these devices, kinetic energy is stored in a magnetically levitated flywheel which spins in a vacuum. The AMB eliminates all mechanical losses, however, electrical loss, which is proportional to the square of the magnetic flux, is still significant. For efficient operation, the flux bias, which is typically introduced into the electromagnets to improve the AMB stiffness, must be reduced, preferably to zero. This zero-bias (ZB) mode of operation cripples the classical control techniques which are customarily used and nonlinear control is required. As a compromise between AMB stiffness and efficiency, a new flux bias scheme is proposed called the generalized complementary flux condition (gcfc). A flux-bias dependent trade-off exists between AMB stiffness, power consumption, and power loss. This work theoretically develops and experimentally verifies new low-loss AMB control designs which employ the gcfc condition. Particular attention is paid to the removal of the singularity present in the standard nonlinear control techniques when operating in ZB. Experimental verification is conduced on a 6-DOF AMB reaction wheel. Practical aspects of the gcfc implementation such as flux measurement and flux-bias implementation with voltage mode amplifiers using IR compensation are investigated. Comparisons are made between the gcfc bias technique and the standard constant-flux-sum (cfs) bias method. Under typical operating circumstances, theoretical analysis and experimental data show that the new gcfc bias scheme is more efficient in producing the control flux required for rotor stabilization than the ordinary cfs bias strategy.Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Control designs for low-loss active magnetic bearings: Theory and implementation.
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245 1 0 $a Control designs for low-loss active magnetic bearings: Theory and implementation.
300 $a 353 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1484.
500 $a Directors: Panagiotis Tsiotras; Bonnie Heck-Ferri.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2004.
520 $a Active Magnetic Bearings (AMB) have been proposed for use in Electromechanical Flywheel Batteries. In these devices, kinetic energy is stored in a magnetically levitated flywheel which spins in a vacuum. The AMB eliminates all mechanical losses, however, electrical loss, which is proportional to the square of the magnetic flux, is still significant. For efficient operation, the flux bias, which is typically introduced into the electromagnets to improve the AMB stiffness, must be reduced, preferably to zero. This zero-bias (ZB) mode of operation cripples the classical control techniques which are customarily used and nonlinear control is required. As a compromise between AMB stiffness and efficiency, a new flux bias scheme is proposed called the generalized complementary flux condition (gcfc). A flux-bias dependent trade-off exists between AMB stiffness, power consumption, and power loss. This work theoretically develops and experimentally verifies new low-loss AMB control designs which employ the gcfc condition. Particular attention is paid to the removal of the singularity present in the standard nonlinear control techniques when operating in ZB. Experimental verification is conduced on a 6-DOF AMB reaction wheel. Practical aspects of the gcfc implementation such as flux measurement and flux-bias implementation with voltage mode amplifiers using IR compensation are investigated. Comparisons are made between the gcfc bias technique and the standard constant-flux-sum (cfs) bias method. Under typical operating circumstances, theoretical analysis and experimental data show that the new gcfc bias scheme is more efficient in producing the control flux required for rotor stabilization than the ordinary cfs bias strategy.
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650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Physics, Electricity and Magnetism. $3 1019535
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