Suspension characteristics of a consequent-pole type bearingless PM motor with wide magnetic gaps

Author

Amada, Miya ; Tanabe, Norimasa ; Asama, Junichi ; Chiba, Akira ; Iwasaki, Satoru ; Takemoto, Masatsugu ; Fukao, Tadashi ; Rahman, M. Azizur

Author_Institution

Dept. of Electr. Eng., Tokyo Univ. of Sci., Chiba

fYear

2008

fDate

20-24 July 2008

Firstpage

1

Lastpage

4

Abstract

A new non-contact drive system has been developed employing a consequent-pole type bearingless permanent magnet (PM) motor. This bearingless motor has a much wider gap with respect to its rotor radius. Wide magnetic gaps can cause a decrease in radial magnetic suspension force of the bearingless motor because of an increase in magnetic reluctance. In this paper, the magnetic suspension forces of the fabricated wide gap bearingless drive system are evaluated, when the rotor is magnetically levitated. Experimental results are also compared to the calculated ones using the finite element method. It is demonstrated that the developed consequent-pole type bearingless PM motor with wide magnetic gaps possesses sufficient magnetic suspension force for non-contact operation.

Keywords

finite element analysis; magnetic forces; motor drives; permanent magnet motors; consequent-pole type bearingless PM motor; finite element method; magnetic reluctance; noncontact drive system; permanent magnet motor; radial magnetic suspension force; rotor radius; wide magnetic gaps; Finite element methods; Iron; Magnetic flux; Magnetic levitation; Magnetic materials; Permanent magnet motors; Protection; Reluctance motors; Rotors; Stators; Bearingless motor; PM motor; consequent-pole; magnetic bearing; wide gap;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

Conference_Location

Pittsburgh, PA

ISSN

1932-5517

Print_ISBN

978-1-4244-1905-0

Electronic_ISBN

1932-5517

Type

conf

DOI

10.1109/PES.2008.4596484

Filename

4596484