| 摘要 |
<p>A brushless, preferably coreless, DC motor or generator characterized by a positive, unidirectional, nearly constant torque. The machine in a preferred form comprises a rotor disc (16, 18) mounted for rotation with a shaft (2) and a stator (28) fixedly mounted in coaxial parallel relation to the rotor. The stator (28) contains at least two interleaved sets (A, B) of coils (26), with the sets of coils adapted to be alternately energized for current flow in the same direction in the plane of the stator to generate axially extending magnetic fields all of the same polarity. The rotor disc (16) carries in a circular array at least one permanent magnet (24), asymmetrically shaped in relation to the shape of the stator coils (26), each having a tip portion (60) and a base portion (62); and with a magnetic field of common polarity extending in the same axial direction as the magnetic fields of the energized coils (26). When the tip portions (60) of the magnets (24) are aligned with a first set (A, B) of coils (26), that set is energized to create a torque on the rotor. The magnets (24) rotate until the tip portions (60) become aligned with the adjacent set (A, B) of coils (26), which are then energized as the first set of coils are simultaneously de-energized. This sequence is continuously repeated to provide a nearly constant output torque.</p> |
