Light weight machine with rotor employing permanent magnets and

Details Light weight machine with rotor employing permanent magnets and Light weight machine with rotor employing permanent magnets and

1994-09-14

1998-01-06

Stephan, Steven L.

Electricity: single generator systems

Generator control

Combined permanent magnet and wound field structure

322 1, 310156, H02P 914

Patent

active

057059179

ABSTRACT:
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.

REFERENCES:
patent: 4217538 (1980-08-01), Ziemacki
patent: 4788486 (1988-11-01), Mashino et al.
patent: 4950973 (1990-08-01), Kouba
patent: 5093611 (1992-03-01), Nakamura et al.
patent: 5162686 (1992-11-01), Royer
patent: 5359248 (1994-10-01), Nagate et al.
patent: 5369325 (1994-11-01), Nagate et al.
patent: 5510662 (1996-04-01), Tanimoto et al.

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