초록 ▼

A brushless, preferably coreless, disc-type DC motor or generator characterized by a positive, unidirectional, nearly constant torque is disclosed. The machine in a preferred form comprises a rotor disc mounted for rotation with the shaft and a stator fixedly mounted in coaxial parallel relation to

A brushless, preferably coreless, disc-type DC motor or generator characterized by a positive, unidirectional, nearly constant torque is disclosed. The machine in a preferred form comprises a rotor disc mounted for rotation with the shaft and a stator fixedly mounted in coaxial parallel relation to the rotor. The stator contains at least two interleaved sets of coils, 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 carries in a circular array at least one permanent magnet, asymmetrically shaped in relation to the shape of the stator coils, each having a tip portion and a base portion; and with a magnetic field of common polarity extending in the same axial direction as the magnetic fields of the energized coils. When the tip portions of the magnets are aligned with a first set of coils, that set is energized to create a torque on the rotor. The magnets rotate until the tip portions become aligned with the adjacent set of coils, 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.

대표청구항 ▼

An electrical machine comprising rotor and stator elements, the rotor element being mounted for rotation about an axis, one of said elements including a coil arrangement having a plurality of sets of coils, each set being in a substantially circular arrangement coaxial with and in opposed relationsh

An electrical machine comprising rotor and stator elements, the rotor element being mounted for rotation about an axis, one of said elements including a coil arrangement having a plurality of sets of coils, each set being in a substantially circular arrangement coaxial with and in opposed relationship to said other element, each coil of each set being angularly offset from a coil of another set, all said coils being wound in a direction to produce similarly oriented magnetic fields extending between said elements upon having current flow through the coils, the other of said elements including a permanent magnet arrangement having a plurality of poles facing said coils and having magnetic fields extending between said elements, all of said poles which face in the same axial direction having the same magnetic orientation, each of said poles being positioned to face each of said coils sequentially as said rotor element rotates, said coils and magnets being relatively shaped to provide a gradually varying magnitude of magnetic interaction therebetween as said coils and magnets have relative motion therebetween, and a switching arrangement for rendering said sets of coils alternately conductive.