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Patent Searching and Data


Title:
PERMANENT MAGNET MOTOR
Document Type and Number:
WIPO Patent Application WO/2015/166544
Kind Code:
A1
Abstract:
 The present invention obtains a permanent magnet motor with which it is possible to reduce a demagnetization-induced decrease in torque and increase the torque per unit of magnet weight. P:N=2n:12n, where P is the number of poles of a permanent magnet (23) and N is the number of slots (73), where: n is an integer of 2 or higher, the length of an air gap between the inner circumference of a stator core (12) and the outer circumference of the permanent magnet (23) is 1.0 mm or less, the permanent magnet (23) contains no heavy rare earth elements and is embedded within a rotor core (22) excluding the curved surface portion on the external periphery, and the thickness of the circumferential center of the permanent magnet (23) is 2.4-4.2 mm.

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Inventors:
TAKIZAWA YUJI (JP)
HORI SHUSUKE (JP)
ICHIKAWA TAKANORI (JP)
AKUTSU SATORU (JP)
Application Number:
PCT/JP2014/061920
Publication Date:
November 05, 2015
Filing Date:
April 29, 2014
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02K21/14; H02K1/27
Domestic Patent References:
WO2013054439A12013-04-18
Foreign References:
JP2009171790A2009-07-30
JP2008086193A2008-04-10
JP2007028857A2007-02-01
Other References:
See also references of EP 3139478A4
Attorney, Agent or Firm:
OIWA Masuo et al. (JP)
Masuo Oiwa (JP)
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