Title:
MAGNETIC GEAR MECHANISM
Document Type and Number:
WIPO Patent Application WO/2012/114368
Kind Code:
A1
Abstract:
The purpose of the invention is to realize a magnetic gear that reduces the eddy current generated inside a magnet and efficiently transmits torque in a magnetic gear structure. In order to solve the problem, the magnetic gear structure is a structure wherein a magnet is disposed inside an iron core in an inside rotor part. Moreover, a bond magnet molded from, for instance, NdFeB powder can be used as the magnet. Eddy current has a large impact on the outside rotor side where there are more poles and the structure therefore can be one where a magnet is disposed on the inside only in an outside rotor part having many poles. Moreover, a buried magnet can also be divided into multiple magnets. Eddy current is less likely to be generated if the magnet is divided into smaller magnets. Therefore, another effective method for reducing eddy current is to assemble a magnetic gear by dividing a magnet into smaller magnets. It is possible to further reduce eddy current by using a structure wherein sheet-like magnets each having the same thickness as a magnetic steel sheet are laminated axially.
Inventors:
ENOMOTO YUJI (JP)
NAKATSUGAWA JUNNOSUKE (JP)
IWASAKI NORIHISA (JP)
KITAMURA MASASHI (JP)
NAKATSUGAWA JUNNOSUKE (JP)
IWASAKI NORIHISA (JP)
KITAMURA MASASHI (JP)
Application Number:
PCT/JP2011/000933
Publication Date:
August 30, 2012
Filing Date:
February 21, 2011
Export Citation:
Assignee:
HITACHI LTD (JP)
ENOMOTO YUJI (JP)
NAKATSUGAWA JUNNOSUKE (JP)
IWASAKI NORIHISA (JP)
KITAMURA MASASHI (JP)
ENOMOTO YUJI (JP)
NAKATSUGAWA JUNNOSUKE (JP)
IWASAKI NORIHISA (JP)
KITAMURA MASASHI (JP)
International Classes:
H02K49/10; F16H49/00
Foreign References:
JP2009168101A | 2009-07-30 | |||
JP2007116885A | 2007-05-10 | |||
JP2001054277A | 2001-02-23 | |||
GB2457682A | 2009-08-26 | |||
US4396849A | 1983-08-02 |
Attorney, Agent or Firm:
INOUE, Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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Claims: