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Method for selectively coupling layers of a stator in a motor/generator
| Details |
Inventors: Smith, Stephen H.; Shenkal, Yuval;
Assignee: Smith Technology Development (San Diego, CA)
Primary Examiner: Enad; Elvin
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
An axial field motor/generator having a rotor that includes at least three annular discs magnetized to provide multiple sector-shaped poles. Each sector has a polarity opposite that of an adjacent sector, and each sector is polarized through the thickness of the disc. The poles of each magnet are aligned with opposite poles of each adjacent magnet. Metal members adjacent the outermost two magnets contain the flux. The motor/generator also has a stator that includes a stator assembly between each two adjacent magnets. Each stator assembly includes one or more conductors or windings. Although the conductors may be formed of wire having a round, uniform cross-section, they may alternatively be formed of conductors having a tapered cross-section that corresponds to the taper of the sectors in order to maximize the density of the conductor in the gap between axially adjacent poles. The conductors may also alternatively be formed of traces in a printed circuit, which may have one or more layers. Each stator assembly may be removably connectable to another stator assembly to provide modularity in manufacturing and to facilitate selection of the voltage at which the motor/generator is to operate. Electrical contacts, such as pins extending from the casing, may removably connect the conductors of adjacent stator assemblies. A magnet may be dynamically balanced on the shaft by hardening a thin ring-of cross-linked resin between the magnet and the shaft while the shaft is spun, using ultraviolet light to polymerize the resin. |
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DETAILED DESCRIPTION The present invention pertains to an axial field motor/generator having a rotor that includes at least three annular discs magnetized to provide multiple sector-shaped poles.
Each sector has a polarity opposite that of an adjacent sector, and each sector is polarized through the thickness of the disc.
These magnets may be made of any suitable, relatively low magnetic permeability (".
mu.
") material, such as a ferroceramic material having a permeability of no more than about 100 times the permeability of air.
The poles of each magnet are aligned with opposite poles of each adjacent magnet.
The magnetic flux thus is oriented axially through aligned sectors of adjacent magnets.
Metal members adjacent to the outermost two magnets contain the flux in the rotor.
Thus, conceptually, the flux follows a circular serpentine path through and around the rotor.
The magnets are polarized into a plurality of sectors, which minimizes demagnetization prior to assembly of the rotor.
Thus, the magnets need not be magnetized in-place, i.
e.
, after assembly, as in certain conventional motors.
Moreover, it is not necessary to use a keeper tool to maintain magnetization during assembly.
The motor/generator also has a stator that includes a layer of conductors or windings between each two adjacent rotor magnets.
Each layer may have multiple conductor phase assemblies, each providing one of a plurality of phases.
Although the conductors may be formed of conventional wire having a round, uniform cross-section, they may alternatively be formed of conductors having a tapered cross-section that corresponds to the taper of the sectors.
This type of cross-section maximizes the density of the conductor in the gap between axially adjacent poles and, thus, the current capacity of the conductor.
The cross-sectional shape may be rectangular to further maximize conductor density.
The terms "rotor" and "stator," as defined herein, are used for purposes of convenience to mean only that the rotor and stator rotate with respect to one another
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Generators or Motors 
