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US 7,375,449 B2Granted
Optimized modular electrical machine using permanent magnets
OwnerPaul D. Butterfieldinventor
Life of this patent
Estimating the term…
Abstract
An electrical machine having a magnet assembly with a magnet carrier ring with an even number of permanent magnets mounted in the carrier ring around a circular locus, and a conductor assembly with one or more conductor circuits wound in a double helix wave winding around a flat conductor support ring with the conductor circuits having uniformly curved conductor segments of involute or arcuate configuration wherein the magnet assembly and conductor assembly are contained in a housing with the magnet assembly rotating relative to the conductor assembly.
Claims20
An axial field electrical machine comprising:
- a supporting structure;
- a magnet assembly;
- and,
- a conductor assembly spaced from the magnet assembly, wherein at least one of the magnet assembly and conductor assembly is rotatable on an axis relative to the supporting structure, wherein the conductor assembly has a disk-like support form with opposite sides and has a flat annular conductor in a double-helix wave winding that has a series of uniform conductor segments on each side of the support that are formed in a continuous uniform curve with one of an involute shape and arc shape, and wherein the magnet assembly has at least one permanent magnet positioned on the magnet assembly to generate a magnetic field substantially parallel to the rotation axis and directed at a portion of the wave winding and substantially centered on the central part of the conductor segments wherein the annular wave winding and support form have substantially coincident axes with the axis of rotation and wherein the conductor segments at the central part have a midpoint tangent that is at a significant angle from a radial of the rotation axis that is normal to the radial.
1 more element
An axial field electrical machine comprising:
- a housing structure;
- a magnet assembly having first and second magnet sub-assemblies;
- and,
- a conductor assembly having a conductor sub-assembly, the housing structure includes end plates and peripheral side walls that encase the magnet assembly and conductor assembly, and the conductor assembly has a conductor wave winding fabricated in a flat annular discoid form with at least one conductor wound in a double helical flat ring wrap having opposite sides with a series of adjacent conductor segments on each side of the wrap having a continuous uniform curve in the form of one of an arc and an involute wherein the adjacent conductor segments on each side of the wrap have a central part, and, wherein the first and second magnet sub-assemblies each have an even number of permanent magnets and are located on each side of the ring wrap with permanent magnets positioned to direct a magnetic field centered at the central part of the conductor segments when one of the magnet assembly and conductor assembly rotates in the housing structure on an axis, wherein the conductor segments at the central part have a midpoint tangent that is at a significant angle from a radial of the rotation axis that is normal to the radial.
1 more element
Dependencies are inferred from the claim text.