Title:
SENSORLESS MAGNETIC LEVITATION VACUUM PUMP AND SENSORLESS MAGNETIC LEVITATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/103095
Kind Code:
A1
Abstract:
An electromagnet has a core with a pair of magnetic poles, a primary coil wound around the core, and a series circuit of a first auxiliary coil wound around the first magnetic pole of the core, a second auxiliary coil wound around the second magnetic pole of the core, and capacitors, and is connected in parallel to the primary coil and the series circuit. The first and the second magnetic poles are each divided into a plurality of split magnetic poles. The first auxiliary coil is composed of a plurality of split auxiliary coils wound around the respective pole in the plurality of split magnetic poles of the first magnetic pole so that the mutual inductance with the primary coil becomes zero. The second auxiliary coil is composed of a plurality of split auxiliary coils wound around the respective pole in a plurality of split magnetic poles of the second magnetic pole so that the mutual inductance with the primary coil becomes zero.
Inventors:
KOZAKI JUNICHIRO (JP)
NAGANO YOSHIHIRO (JP)
NAGANO YOSHIHIRO (JP)
Application Number:
PCT/JP2012/083201
Publication Date:
July 11, 2013
Filing Date:
December 21, 2012
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
F04D29/058; F04D19/04; F16C32/04
Foreign References:
| JP2006283799A | 2006-10-19 | |||
| JPH08223857A | 1996-08-30 | |||
| JPH02184205A | 1990-07-18 | |||
| JP2009174646A | 2009-08-06 |
Attorney, Agent or Firm:
KITA, Toshifumi et al. (JP)
Toshifumi Kita (JP)
Toshifumi Kita (JP)
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