| 摘要 |
A brushless direct current outer rotor motor with a substantially cylindrical air gap (14), particularly for driving magnetic disks. The rotor (16) of the motor (10) supports a permanently-magnetized exciter magnet (13, 13'') having at least two pairs of poles and a permanently-magnetized control magnet (18, 18', 18''). At least one detector (20, 34, 26) of rotary position cooperates with its control magnet, and is responsive to the magnetic field to sense the position of the rotor. There is also provided commutating means (32) responsive to the detector of the rotary position, and a stator winding means (12) connected to the commutating means. A control pulse generator stage (21,29; 35,36; 47,55) adapted to generate one pulse only per each revolution of the rotor (16) is coordinated with the control magnet (18, 18', 18'').
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