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US 5,204,570 AGranted
Spheroidal machine
OwnerSten R. Gerfastinventor
Life of this patent
Estimating the term…
Abstract
A dynamoelectric machine that is both inexpensive and efficient has a rotor including one or more permanent magnets, the working faces of which lie in a spheroid and are centered on the equator of the spheroid. Surrounding the rotor is a brushless stator having spirally wound stator coils. Each coil has a cup-shaped working face centered on said equator and closely spaced from the working faces of the magnet. This dynamoelectric machine can be small, lightweight, and almost twice as efficient as any prior dynamoelectric machine that is equally inexpensive.
Claims16
A dynamoelectric machine comprising
- (a) a rotor comprising a rotatable shaft,
- (b) at least one permanent magnet fixed to the shaft and having working faces of alternating N and S magnet poles lying substantially in a spheroid that has the shaft as its axis and has an equator, each magnet pole being centered on the equator of the spheroid,
- (c) a stator comprising a frame in which the shaft is journalled, and
- (d) at least one spiral coil of electrically conductive wire fixed to the frame, each coil having a cup-shaped working face centered on said equator and closely spaced from the working faces of the magnet.
1 more element
A dynamoelectric machine comprising
- (a) a rotor including a rotatable steel shaft on which is mounted a symmetrical box-like cage having an even number n of flat faces that abut each other to encircle the shaft, each of which faces is parallel to and equidistant from an axis of the shaft,
- (b) mounted on each face of the cage, a permanent magnet which has a working face that is a single magnet pole, each working face
- (i) lying substantially in a spheroid that has the shaft as the axis and has an equator,
- (ii) being centered on the equator of the spheroid, and
- (iii) having a single magnet pole that is opposite in polarity to the poles of adjacent magnets,
- (c) a brushless stator comprising a stator frame having a disklike flange projecting beyond a central cylindrical bearing support which contains a pair of bearings in which the shaft is journalled,
- (d) n ironless spiral coils of electrically conductive wire, each coil being of uniform thickness, having a cup-shaped working face, and being fixed to the stator frame with each coil closely spaced from the working faces of the permanent magnets, centered on said equator, and adjacent coils substantially touching, and
- (e) all of the magnet poles rotate into simultaneous coextensive alignment with the working faces of the coils.
5 more elements
Dependencies are inferred from the claim text.