Claims
- 1. A brushless DC motor comprising:
- a rotor which includes a shaft disposed at a center of a rotor yoke and a ring-shaped rotor magnet having N and S poles alternately magnetized in a circumferential direction,
- a stator which has first and second stator yokes provided with magnetic poles formed by bending a soft magnetic metal plate assembled to oppose each other so that the magnetic poles of the first and second stator yokes are alternately disposed while keeping a certain gap along a periphery of the rotor magnet, said first and second stator yokes having fitting through-holes at their center;
- a coil unit which is disposed between both the stator yokes of the stator and has a magnetic field coil disposed on a coil bobbin having a flange at ends, and
- a sleeve which has fitting portions at opposite ends inserted in said through-holes disposed at a center of the stator to form said stator and supports the revolving shaft through a bearing within it,
- a flange provided on one end of the bearing,
- a base plate with a fitting projection having a convex cross section and an engaging hole having a diameter smaller than that of said flange, said fitting projection of the base plate being held between the stator and said flange of the bearing to fix the stator to the base plate thereby assuring that said bearing stands at right angles with respect to said base plate.
- 2. A brushless DC motor according to claim 1 wherein said fitting projection has a cylindrical shape having inner and outer side faces, with said outer side face being in contact with an inner face of said stator, and said inner side face being in close contact with the bearing.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of Ser. No. 08/240,702, filed as PCT/JP92/01464, Nov. 10, 1992.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
240702 |
Nov 1992 |
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