Title:
MAGNET TYPE BRUSHLESS MOTOR
Document Type and Number:
Japanese Patent JPH1169743
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a magnet type brushless motor producing a high torque during low speed rotation while keeping a high conversion efficiency up to an r.p.m. about three times as high as conventional r.p.m. SOLUTION: The field magnet 3 of a rotor 2 comprises first and second field magnets 31, 32 rotatable relatively. A mechanism for varying the phase of combined pole of the field magnet relative to the first field magnet 31 as the rotor 2 rotates arranges the poles of different polarity in the first and second field magnets 31, 32 during low speed rotation. A governor functions with centrifugal force as the rotational speed increases and a relative rotational force is imparted to the second field magnet 32.
Inventors:
MASUZAWA MASAHIRO
HIRAO NORIYOSHI
SASAKI TAKASHI
MITA MASAHIRO
HIRAO NORIYOSHI
SASAKI TAKASHI
MITA MASAHIRO
Application Number:
JP21421797A
Publication Date:
March 09, 1999
Filing Date:
August 08, 1997
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
H02K29/06; H02K7/12; H02K21/14; H02P7/06; (IPC1-7): H02K21/14; H02K7/12; H02K29/06; H02P5/08
Attorney, Agent or Firm:
Hiroshi Morita
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