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US 4,823,039 AGranted
Electrical machines
OwnerCedric Lynchinventor
Life of this patent
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OwnerCedric Lynchinventor
Estimating the term…
There is disclosed a rotor for an electrical machine, the rotor having a current-carrying winding comprising a plurality of circumferentially distributed winding portions which lie in at least one plane perpendicular to the rotor axis, and extend from a radially inner region to a radially outer region. A commutator is provided by surfaces of the winding portions at the inner region, and the winding is formed from a plurality of conductive sections, each having ends which lie at said outer region, interconnections between the winding sections being made only by way of those ends. Thus, soldered connections made between the winding sections will be remote from the commutator, which is the main source of heat for overheating, and moreover will be at positions where air cooling due to rotor movement is greatest. Air gaps between the winding portions at the outer region aid this cooling affect even further.
A rotor for an electrical machine, the rotor having a rotor axis and a current-carrying winding comprising a plurality of circumferentially distributed winding portions which lie in a plurality of planes perpendicular to said rotor axis, said winding portions extending from a radially inner region to a radially outer region, and a commutator provided by surface of the winding portions at said inner region, the winding being formed from a plurality of integrally formed conductive sections each having first and second ends, both of which lie at said outer region, and comprising first and second main portion which extend from respective ones of said ends inwardly in respective ones of said planes to the inner region and an inner bridging portion extending between said planes and providing integral connection between said main portions at said radially inner region of the rotor, interconnections between the said conductive sections being made only by way of said ends at said outer region, the conductive sections each comprising metal strip, the surface providing the commutator being edge surface of the metal strip, said edge surface facing in the direction of said rotor axis.
A rotor according to claim in combination with a stator for producing a magnetic field for interaction with current flowing in the rotor, and means to divert the magnetic field to vary the interaction.
A rotor according to claim 6 wherein the stator includes a series of alternately oppositely polarized permanent magnets arranged in a circle, and each spaced from the rotor, the diverting means including a corresponding series of diverting members moveable in the spaces between the permanent magnets and the rotor to vary the proportion of the magnetic field produced by each of the permanent magnets which flow through the rotor and the proportion which is short-circuited to adjacent of said permanent magnets in the series.
An electrical machine in which a current carrying member is acted upon by and rotatable relative to magnets disposed to opposite sides of the current carrying member, a pair of magnetic field diverting members being disposed to the opposite sides of the current carrying member between the magnets and the current carrying member, and the diverting members being coupled together for movement in opposite directions relative to the magnets to vary the proportion of the magnetic field produced by each magnet which flow through the current carrying member.
An electrical machine in which a disc-shaped current carrying rotor having a rotational axis is acted upon by and rotatable relative to a series of permanent magnets arranged to provide a stator producing a magnetic field with which the current in said rotor interacts, said series comprising at least first and second circular sub-series which are centered on the rotational axis and which are relatively rotatable about the axis to vary the interacting field, wherein associated with said series of permanent magnets is a corresponding series of magnetically permeable pole pieces arranged in a circle between said series of permanent magnets and said rotor, the permanent magnets of one said sub-series being attached to first portions of respective said pole pieces, and the permanent magnets of the other sub-series being registrable by said relative rotation with second portions of the respective pole pieces.
Dependencies are inferred from the claim text.