Title:
BRUSHLESS DC MOTOR
Document Type and Number:
WIPO Patent Application WO/1996/003793
Kind Code:
A1
Abstract:
A permanent magnet housing (3b) and a magnetic gap (3c) are formed in a rotor (3), and a permanent magnet (4) and its position are set designed so that the minimum value of the distance from a portion of a boundary surface of the permanent magnet housing (3b) on the rotor outer peripheral side corresponding to an end portion of the permanent magnet (4) in a transverse direction to a boundary surface of both spaces (3b, 3c) on the rotary shaft side becomes greater than the distance of the permanent magnet housing (3b) at a transverse end portion of the permanent magnet (4) in the direction of thickness. Thus, initial performance can be maintained by preventing demagnetization of the permanent magnet resulting from a reverse magnetic field, and the cost of a brushless DC motor can be reduced by reducing the volume of the permanent magnet.
Inventors:
YAMAGIWA AKIO (JP)
OOYAMA KAZUNOBU (JP)
KOJIMA HIROAKI (JP)
OOYAMA KAZUNOBU (JP)
KOJIMA HIROAKI (JP)
Application Number:
PCT/JP1995/001489
Publication Date:
February 08, 1996
Filing Date:
July 25, 1995
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
YAMAGIWA AKIO (JP)
OYAMA KAZUNOBU (JP)
KOJIMA HIROAKI (JP)
YAMAGIWA AKIO (JP)
OYAMA KAZUNOBU (JP)
KOJIMA HIROAKI (JP)
International Classes:
H02K1/27; H02K29/00; (IPC1-7): H02K29/00; H02K1/27
Foreign References:
| JPH05236687A | 1993-09-10 | |||
| JPH04138042A | 1992-05-12 | |||
| JPH0498847U | 1992-08-26 | |||
| JPH0498848U | 1992-08-26 | |||
| JPH05236684A | 1993-09-10 | |||
| JPH05236685A | 1993-09-10 | |||
| JPH0469027A | 1992-03-04 |
Other References:
See also references of EP 0773621A4
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