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Patent Searching and Data


Title:
BRUSHLESS MOTOR
Document Type and Number:
WIPO Patent Application WO/2000/064036
Kind Code:
A1
Abstract:
A brushless motor comprises a stator (3) with an armature coil (11) wound on it, a rotor (5) capable of rotating inside or outside the stator (3), a ring magnet (24) and a sensor unit (25) which detect the position of the rotor, a motor driver (31) for energizing the armature coil (11) so that a rotating magnetic field may appear according to the rotor position. The rotor (5) comprises a field magnet that includes a plurality of permanent magnets (9) magnetized to the same pole and a plurality of control poles (10) of magnetic material interposed between the permanent magnets (9). The stator (3) is provided with a field coil (13) that forms a closed magnetic circuit passing through the control poles (10). The characteristics of the motor are controlled without sacrificing motor efficiency by controlling the direction and amount of current for energizing the field coil (13).

Inventors:
UCHIYAMA HIDEKAZU (JP)
NOZUE YUTAKA (JP)
Application Number:
PCT/JP2000/002566
Publication Date:
October 26, 2000
Filing Date:
April 20, 2000
Export Citation:
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Assignee:
MITSUBA CORP (JP)
UCHIYAMA HIDEKAZU (JP)
NOZUE YUTAKA (JP)
International Classes:
H02K21/04; H02K21/14; H02K21/22; H02K29/06; (IPC1-7): H02K29/00; H02K21/14
Foreign References:
JPS6278072U1987-05-19
JPH10178752A1998-06-30
JPH09172760A1997-06-30
US4656379A1987-04-07
Other References:
See also references of EP 1182766A4
Attorney, Agent or Firm:
Tsutsui, Yamato (Tsutsui & Associates N.S.Excel 301, 22-45 Nishi-Shinjuku 7-chome Shinjuku-ku, Tokyo, 160-0023, JP)
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