DocumentCode :
1925060
Title :
A two-axis actively regulated consequent-pole bearingless motor with wide magnetic gaps
Author :
Asama, Junichi ; Tatara, T. ; Oiwa, Takaaki ; Chiba, Akira
Author_Institution :
Dept. of Mech. Eng., Shizuoka Univ., Hamamatsu, Japan
fYear :
2013
fDate :
15-19 Sept. 2013
Firstpage :
1541
Lastpage :
1546
Abstract :
A bearingless motor that combines the functions of both non-contact suspension and rotation is practically applied to centrifugal pumps in certain industries in which the contamination of wear particles in a pumping medium must be avoided. In bearingless contamination-free pumps, protective covers must be attached to the rotor and stator surfaces in order to prevent liquid contamination and to provide chemical resistance. These covers should be as thick as possible, for long-term use. Therefore, the magnetic gap between the rotor and the stator should be designed to be wider than that in conventional bearingless motors. However, such a wide magnetic gap may cause a reduction in the suspension force and torque. In this study, a two-axis actively positioned consequent-pole bearingless motor with a wide magnetic gap of 8 mm is investigated using the three-dimensional finite element method analysis. The calculation results show that the proposed structure produces sufficient suspension force and torque under the condition of a wide magnetic gap.
Keywords :
electric motors; finite element analysis; pumps; rotors; stators; bearingless contamination-free pumps; centrifugal pumps; chemical resistance; liquid contamination prevention; magnetic gaps; noncontact suspension; protective covers; pumping medium; rotor surface; stator surface; suspension force reduction; three-dimensional finite element method analysis; torque reduction; two-axis actively-positioned consequent-pole bearingless motor; two-axis actively-regulated consequent-pole bearingless motor; wear particle contamination; Force; Magnetic cores; Magnetic flux; Magnetic levitation; Rotors; Suspensions; Torque;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2013 IEEE
Conference_Location :
Denver, CO
Type :
conf
DOI :
10.1109/ECCE.2013.6646888
Filename :
6646888
Link To Document :
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