Title:
MAGNETIZATION METHOD OF MAGNET AND DC MOTOR EMPLOYING MAGNET MAGNETIZED BY THE METHOD
Document Type and Number:
Japanese Patent JP3685835
Kind Code:
B2
Abstract:
PURPOSE: To reduce the torque ripple of a DC motor and, further, improve an effective torque smoothly.
CONSTITUTION: A magnet 1 is made to touch or come close to the coil part 4 of a magnetizing coil unit 2 and the coil part 4 is excited to magnetize the magnet 1 so as to have a required pole arrangement 14. When the coil part 4 is excited and the magnet 1 is magnetized, a magnetic yoke member 7 which has a nonmagnetic conducting part 9 in its inner circumference 13 is provided on the outer circumference 12 of the magnet 1.
Inventors:
Koji Kihara
Application Number:
JP4643195A
Publication Date:
August 24, 2005
Filing Date:
February 10, 1995
Export Citation:
Assignee:
Nidec Corporation
International Classes:
H02K29/00; H02K15/03; H02K21/12; (IPC1-7): H02K15/03; H02K21/12; H02K29/00
Domestic Patent References:
| JP5168201A | ||||
| JP4244767A |
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