Coleman Powermate, Inc.

G Weylin Johnson

Harold C Scott

William J Anderson

Henry Tally

Ardel R Bednorz

Mitchell K Davis

Kandarp I Pandya

A lightweight engine-driven generator set including a stator having at least first and second windings (preferably three-phase) and a rotor having a soft magnetic core and a plurality of high energy product permanent magnets, separated by consequence poles, disposed proximate the stator such that relative motion of the rotor and stator causes magnetic flux from the rotor to interact with and induce current in the stator windings. The first winding includes a predetermined number of turns corresponding to a first predetermined voltage output; and the second winding includes a predetermined number of turns corresponding to a second predetermined voltage output, the respective windings being grouped together as a unit and wound about the core such that the respective winding coils are wound in continuous close thermal contact with each other. The first winding generates a relatively high voltage, low amperage signal, and the second winding generates a relatively low voltage, high amperage signal; and a switch provides for selection of the desired output. Preferably the rotor is a hollow cylinder mounted on the engine shaft for rotation about the stator and such that the proper gap distance between rotor and stator is maintained during rotation of the rotor without bearings external to the engine. The low voltage, high amperage winding (or winding group) may be tapped to provide a selectable voltage output. Suitable rectifiers and inverters may be provided to effect selective DC and AC output signals.

Light weight rotor and stator with multiple coil windings in thermal

A mechanically and electrically efficient, lightweight, portable motor-generator includes a stator having a plurality of windings and a rotor with a body of soft-magnetic material carrying a plurality of permanent, high energy product magnets in a surface near the stator such that relative motion of the rotor and stator causes magnetic flux from the permanent magnets to interact with and induce current in the stator windings. The magnets are mounted in insets formed in the rotor surface which includes portions between the insets to form respective consequence poles. The rotor is a hollow cylinder with the magnets mounted on an internal surface, and the stator is concentrically disposed within the cylinder. The stator includes first and second windings. A first rectification circuit, responsive to signals from the first stator winding, develops a relatively high voltage, low amperage DC signal; and a second rectification circuit, responsive to signals from the second stator winding, develops a relatively low voltage high amperage DC signal. In one preferred embodiment, the first and second windings are 3-phase, and the corresponding phases of the respective 3-phase windings are grouped together as a unit and wound about the core such that the corresponding phases of the respective 3-phase windings coils are wound in continuous thermal contact with each other. Each phase of at least one winding includes a first portion defined by a tap to provide a third voltage output.

Light weight machine with rotor employing permanent magnets and

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Hastings, NE, United States of America

G Weylin Johnson