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Patent Searching and Data


Title:
BRUSHLESS MOTOR AND ELECTRIC TOOL
Document Type and Number:
Japanese Patent JP2017034841
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a brushless motor and an electric tool capable of preventing an annulus magnet from rotating with respect to a rotor core and a rotation axis.SOLUTION: A motor 3 mounted on an impact driver 1, comprises: a shaft 31; a columnar rotor core 32 which is disposed on the outer periphery of the shaft 31 and rotates together with the shaft 31; an annulus magnet 33 which is disposed on the outer periphery of the rotor core 32; and a fan 35 disposed on the outer periphery of the shaft 31. To prevent the annulus magnet 33 from rotating with respect to the shaft 31 and the rotor core 32, recesses 32c and 33c are formed on the rotor core 32 and the annulus magnet 33 via the fan 35, to thereby prevent rotation of the annulus magnet 33.SELECTED DRAWING: Figure 5

Inventors:
YAMAGUCHI ISATO
Application Number:
JP2015152403A
Publication Date:
February 09, 2017
Filing Date:
July 31, 2015
Export Citation:
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Assignee:
HITACHI KOKI KK
International Classes:
H02K1/27; B25F5/00
Attorney, Agent or Firm:
Kazuhiro Kitazawa
Shin Koizumi
Akiko Ichikawa