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Title:
ROTOR STRUCTURE FOR OUTER ROTOR ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2018/216599
Kind Code:
A1
Abstract:
An outer rotor electric motor configured so that: a rotor provided with a dish-shaped rotor case and also with a plurality of permanent magnets affixed to the inner periphery of the rotor case is disposed to cover a stator; and the upper end of a rotating shaft having a vertically extending axis is fastened to the center of an end wall of the rotor case by a fastening member having a part thereof exposed to the outside from the upper surface of the end wall. In this outer rotor electric motor: a plurality of cooling blades (33) which sucks-in from below the stator a cooling air flow for cooling the stator (12) protrude downward from the lower surface of the end wall (31A), extend radially, and are mounted integrally to the end wall; radially extending grooves (34A) for discharging water from the center of the upper surface of the end wall are formed in the upper surface of the end wall so as to individually correspond to the cooling blades; and a plurality of cooling air flow discharge holes for discharging to the outside an air flow produced by the cooling blades are formed in a sidewall (32) of the rotor case (23A). Thus, the cooling blades are provided to the end wall of the rotor case, and rainwater or the like is prevented from accumulating on the upper surface of the end wall.

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Inventors:
SUDA MANABU (JP)
MORINAGA TETSUO (JP)
KAKUAGE KOKI (JP)
SUGAI TAKAHIRO (JP)
Application Number:
PCT/JP2018/019133
Publication Date:
November 29, 2018
Filing Date:
May 17, 2018
Export Citation:
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Assignee:
SAWAFUJI ELECTRIC CO LTD (JP)
International Classes:
H02K5/10; H02K9/06
Domestic Patent References:
WO2014160268A12014-10-02
WO2017051784A12017-03-30
Foreign References:
JP2008154369A2008-07-03
JP2001061256A2001-03-06
Attorney, Agent or Firm:
OCHIAI & CO. (JP)
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