James L Hahn

US Patent:

43908055, Jun 28, 1983

Filed:

Dec 24, 1981

Appl. No.:

6/334303

Inventors:

James H. Hahn - Fort Lauderdale FL

International Classification:

H02K 2126

US Classification:

310154

Abstract:

A disc-type motor characterized by increased efficiency is disclosed. The motor has two parallel spaced stator members each having a flat circular shape and an even plurality of pie-segmented permanent-magnet poles in a circular array thereon, illustratively eight in number. The facing poles of the stator members have opposite polarities. The motor includes a disc rotor made of a non-conducting material rotatably mounted between the two stator members. Conducting wires are wound to form a number of coils in a circular array on each face of the rotor. The number of coils on each rotor face is greater than the number of poles on each stator member, and each coil occupies an arc sector area smaller than the area of each stator pole. The coils arrayed on one face of the rotor are angularly offset from the coils on the other face of the rotor. The motor further includes a commutator connected to the rotor which has a number of segments corresponding to the coils of the rotor.

US Patent:

45089981, Apr 2, 1985

Filed:

Feb 9, 1981

Appl. No.:

6/232810

Inventors:

James H. Hahn - Fort Lauderdale FL

International Classification:

H02K 2900

US Classification:

318138

Abstract:

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.