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Title: Levitation forces in bearingless permanent magnet motors

Abstract

Bearingless motors combine brushless AC-motors with active magnetic bearings by the integration of two separate winding systems (torque and radial levitation force windings with different pole pairs) in one housing. This paper gives an insight into the influences of the motor design on the levitation force and torque generation. It is shown that especially for machines with small air gaps it can be very important to choose the right design parameters. Increasing the permanent magnet height in order to increase the motor torque can result in a remarkable reduction of radial forces. The interrelationships are discussed on the basis of Maxwell and Lorentz forces acting upon the stator surface. The investigations are presented for a bearingless low cost motor, suited for pump, fan or blower applications. The presented motor needs only four coils for operation.

Authors:
; ;
Publication Date:
Research Org.:
Johannes Kepler Univ., Linz (AT)
OSTI Identifier:
20000840
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; PERMANENT MAGNETS; LEVITATION; DESIGN; TORQUE; MAGNETIC BEARINGS; LORENTZ FORCE; USES; STATORS

Citation Formats

Amrhein, W., Silber, S., and Nenninger, K. Levitation forces in bearingless permanent magnet motors. United States: N. p., 1999. Web. doi:10.1109/20.800752.
Amrhein, W., Silber, S., & Nenninger, K. Levitation forces in bearingless permanent magnet motors. United States. doi:10.1109/20.800752.
Amrhein, W., Silber, S., and Nenninger, K. Wed . "Levitation forces in bearingless permanent magnet motors". United States. doi:10.1109/20.800752.
@article{osti_20000840,
title = {Levitation forces in bearingless permanent magnet motors},
author = {Amrhein, W. and Silber, S. and Nenninger, K.},
abstractNote = {Bearingless motors combine brushless AC-motors with active magnetic bearings by the integration of two separate winding systems (torque and radial levitation force windings with different pole pairs) in one housing. This paper gives an insight into the influences of the motor design on the levitation force and torque generation. It is shown that especially for machines with small air gaps it can be very important to choose the right design parameters. Increasing the permanent magnet height in order to increase the motor torque can result in a remarkable reduction of radial forces. The interrelationships are discussed on the basis of Maxwell and Lorentz forces acting upon the stator surface. The investigations are presented for a bearingless low cost motor, suited for pump, fan or blower applications. The presented motor needs only four coils for operation.},
doi = {10.1109/20.800752},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}