Permanent magnet direct current (PMDC) machine with integral reconfigurable winding control
OwnerNicholas N. Riverainventor
Life of this patent
Estimating the term…
Abstract
A permanent magnet direct current machine is provided. The rotor has permanent magnets acting as poles for feeding magnetic flux to the stator. The stator has a multiplicity of "slot paths". Each slot path has as many slots as there are poles on the rotor and also has as many coils as there are poles on the rotor. The coils of a slot path are equally spaced around the axis of the machine and each coil of the slot path is wound through two slots. The coils of a slot path may be switched from series to parallel to hybrid relationships to vary the operating characteristics of the machine.
Claims26
A permanent magnet direct current machine comprising:
- said machine having a stator element,
- said machine having a rotor element,
- said elements defining an air gap between them, and
- poles, on said rotor, said poles comprising permanent magnets for providing magnetic flux across said air gap,
- said stator element having more slot paths, than there are poles in the rotor, each slot path having coils,
- said rotor element being rotatable about an axis,
- the gross angular width of each slot of each slot path, as measured in a plane perpendicular to said axis, being small as compared to the gross angular width of one of said poles as measured in said plane,
- each said pole, at any instant in time, facing a group of said coils,
- the group of coils which at any instant in time, faces a magnet pole, producing a flux which passes around such group and passes through the space between said group and the magnet pole that faces the group.
A direct current machine, comprising:
- a stator,
- a rotor having a plurality of poles each of which produces a magnetic field that passes in the opposite direction, relative to the pole, as its neighboring poles,
- said rotor and said stator having an air gap between them,
- a plurality of slot paths in said stator, each said slot path having as many slots as there are poles on said rotor,
- said slots extending radially outward from said air gap and into said stator, and
- a layer of magnetic material contiguous with said air gap and extending over a limited area of said rotor or said stator.
A direct current generator, comprising:
- said generator having a stator,
- said generator also having a rotor with a plurality of poles each of which produces a magnetic field that passes in the opposite direction, relative to the pole, from the direction of the field produced by its neighboring poles,
- said rotor having an axis,
- an output having at least two conductors,
- said rotor and stator having an air gap between them,
- a plurality of slot paths in said stator for generating a potential difference across said conductors, each said slot path having as many coils as there are poles on said rotor, and
- a control device that reconfigures the interconnections of said coils and changes the potential difference between said output conductors.
A direct current machine, comprising:
- a stator,
- a rotor having poles and rotating about an axis, said rotor and stator defining an air gap between them,
- said poles feeding a magnetic field across said air gap,
- said stator having slot paths, each of which slot paths has coils, the coils of each slot path being equal in number to the number of poles on said rotor and equally angularly spaced around said axis.
The method of providing a direct current generator which enables its output voltage to be varied without changing the speed at which the generator operates, comprising:
- providing a rotor that has poles,
- providing a stator having a plurality of slot paths on the stator,
- providing each slot path with as many coils thereon as there are poles on said rotor, and
- reconfiguring the coils of each slot path to change the output voltage without substantially changing the speed at which the rotor rotates.
Dependencies are inferred from the claim text.