Title:
DC BRUSH MOTOR DEVICE AND ITS PERMANENT MAGNET
Document Type and Number:
Japanese Patent JP2004007984
Kind Code:
A
Abstract:
To reduce the size of a motor device of 1 to 300 W class.
An exciting magnet is formed of an anisotropy bond magnet 13 of a hollow cylindrical shape in the brush motor device and magnetized to four poles. The anisotropy bond magnet 13 includes a product of maximum energy about four times of a conventional sintered ferrite magnet. When four-pole magnetization is applied, a magnetic force contributing to torque impartment is increased since the magnetic path length of a magnetic circuit per pole is reduced. When the same torque as a conventional one is applied, the length of an electromagnetic rotating body and the axial length of a permanent magnet can be reduced, thus reducing the size of the motor device of 1 to 300 W class.
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Inventors:
MOTOKURA YOSHINOBU
HASHIMOTO YOUNI
MITARAI HIROSHIGE
HASHIMOTO YOUNI
MITARAI HIROSHIGE
Application Number:
JP2003162445A
Publication Date:
January 08, 2004
Filing Date:
June 06, 2003
Export Citation:
Assignee:
AICHI STEEL WORKS LTD
International Classes:
H02K1/22; H02K1/27; H02K21/30; (IPC1-7): H02K1/27; H02K1/22; H02K21/30
Attorney, Agent or Firm:
Osamu Fujitani