Dynamo electric machine with permanent magnet rotor structure

A rotor structure for mounting within a stator to form a permanent magnet generator, said rotor structure comprising a rotor core formed of a magnetic material, said rotor core having a round peripheral portion, a plurality of permanent magnets embedded within the rotor core and developing a radial magnetic flux for linking with the stator, a plurality of conductive magnetic shims embedded within the core with one each located adjacent said magnets and in radial alignment with said magnets and thereby aligned with and carrying the magnetic flux established by the aligned said permanent magnets, said conductive magnetic shims responding to changes in the magnetic flux therein to create eddy currents within said conductive magnetic shims and further modifying the flux field in said rotor and stator.

A rotor structure for mounting within a stator having a stator winding to form a permanent magnet generator, said rotor structure comprising a rotor core formed of a magnetic material, a plurality of magnet units secured to the rotor, each said magnetic unit including a permanent magnet having a radial polarization and forming a magnetic flux directed radially from the rotor core for linking with the stator winding, each said magnetic unit including a conductive magnetic member radially aligned with the permanent magnet and carrying said flux directly through said conductive magnetic members.

A rotor structure for mounting within a stator to form a permanent magnet generator comprising a rotor core formed of a magnetic material and having an outer round surface, a plurality of rectangular magnetic units secured within said rotor core and developing a radial magnetic flux extending radially outwardly of said round surface, each of said magnetic units including a permanent magnet and a thin conductive magnetic member radially aligned with and subjected to the magnetic field established by the permanent magnet of the unit.

In a permanent magnet generator having a annular stator with a winding wound on the inner periphery and having a capacitor connected in parallel with said winding for developing output voltage in response to rotation of a rotor therein, said rotor comprising:

• a rotor core of a magnetic material, a plurality of circumferentially spaced and axially elongated openings in the outer peripheral portion of said core, air gaps located between the circumferentially spaced openings and with sidewalls between the air gaps and the openings, a plurality of permanent magnetic units located one each in each of said openings, each of said permanent magnetic units including a permanent magnet and an abutting magnetic conductive member abutting a radially located surface of said permanent magnetic, said permanent magnet being radially polarized and establishing a permanent magnetic field coupled to said stator winding and developing with said stator winding a radial magnetic field passing through the permanent magnet and said conductive magnetic member, said field creating eddy currents within said conductive magnetic members and thereby creating a further magnetic flux for canceling of harmonics from the total magnetic field of the stator and rotor and thereby producing a fundamental output voltage with reduced harmonic content.