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US 6,191,517 B1Granted
Brushless synchronous rotary electrical machine
AssigneeS. H. R. Limited BVI
InventorAlexander Radovsky
Life of this patent
Estimating the term…
Abstract
A brushless synchronous electrical machine includes a rotor rotating about a rotor axis, and a stator that includes at least one set of magnetically active stator cores projecting radially outward from the axis, and that also includes magnetically interactive crossbars on the radially outward ends of the stator cores. The rotor includes one or more magnetically active projections that sweep past the radially inward facing surfaces of the crossbars as the rotor rotates. Preferably, there are two sets of stator cores, displaced axially and staggered azimuthally with respect to each other. Stator windings are wound toroidally about the stator cores. The rotor is provided with a magnetic field, preferably by electrical current in one or more axial windings wound toroidally with respect to the rotor axis.
Claims13
An electrical machine comprising:
- (a) a rotor, free to rotate about a rotor axis and including:
- (i) a first magnetically interactive projection extending radially outward from said rotor axis, and
- (ii) a second magnetically interactive projection extending radially outward from said rotor axis;
- and
- (b) a stator including:
- (i) a first plurality of magnetically interactive stator cores extending radially outward from a first common center located on said rotor axis,
- (ii) a second plurality of magnetically interactive stator cores, like in number to said stator cores of said first plurality and extending radially outward from a second common center located on said rotor axis and different from said first common center,
- said common centers defining a stator axis coincident with said rotor axis, said stator cores of said first plurality being positioned azimuth ally around said stator axis at substantially equal angular separations, said stator cores of said second plurality being positioned azimuthally around said stator axis at substantially equal angular separations, said stator cores of said second plurality being displaced azimuthally with respect to said stator cores of said first plurality,
- (iii) a structure for magnetically linking said first projection of said rotor to a radially outward end of each of said stator cores as said first projection sweeps past each said stator core as said rotor rotates, said structure including, for each said stator core, a magnetically interactive crossbar, substantially parallel to said rotor axis, rigidly attached to said radially outward end of said each stator core, and having first and second radially inward surfaces, said first projection of said rotor sweeping past said first radially inward surfaces as said rotor rotates, and said second projection of said rotor sweeping past said second radially inward surface as said rotor rotates, and
- (iv) a magnetically interactive hub, radially inward from said stator cores, said stator cores being riaidly attached to, and projecting radially outward from, said hub;
- and wherein said stator includes a plurality of H-pieces, each said H-piece including a radially inward axial portion, a radial outward axial portion, and a radial portion joining said axial portions, with said radially inward axial portion being a segment of said hub, said radial portion being one of said stator cores, and said radially outward axial portion being said crossbar that is rigidly attached to said radially outward end of said one stator core.
8 more elements
An electrical machine comprising:
- (a) a rotor, free to rotate about a rotor axis and including:
- (i) a first magnetically interactive projection extending radially outward from said rotor axis,
- (ii) a second magnetically interactive projection extending radially outward from said rotor axis, and
- (iii) a magnetically interactive shaft, substantially coaxial with said rotor axis, connecting said projections, and including a plurality of radial grooves that span said shaft axially, so as to suppress eddy currents;
- and
- (b) a stator including:
- (i) a first plurality of magnetically interactive stator cores extending radially outward from a first common center located on said rotor axis, and
- (ii) a structure for magnetically linking said first projection of said rotor to a radially outward end of each of said stator cores as said first projection sweeps past each said stator core as said rotor rotates, said structure including, for each said stator core, a magnetically interactive crossbar, substantially parallel to said rotor axis, rigidly attached to said radially outward end of said each stator core, and having first and second radially inward surfaces, said first projection of said rotor sweeping past said first radially inward surfaces as said rotor rotates, and said second projection of said rotor sweeping past said second radially inward surface as said rotor rotates.
5 more elements
An electrical machine comprising:
- (a) a rotor, free to rotate about a rotor axis and including:
- (i) a first magnetically interactive projection extending radially outward from said rotor axis,
- (ii) a second magnetically interactive projection extending radially outward from said rotor axis, and
- (iii) a magnetically interactive shaft, substantially coaxial with said rotor axis, connecting said projections, and including a plurality of sheets of a magnetically active material, said sheets extending radially outward from said rotor axis, said sheets being separated by at least one insulator;
- and
- (b) a stator including:
- (i) a first plurality of magnetically interactive stator cores extending radially outward from a first common center located on said rotor axis, and
- (ii) a structure for magnetically linking said first projection of said rotor to a radially outward end of each of said stator cores as said first projection sweeps past each said stator core as said rotor rotates, said structure including, for each said stator core, a magnetically interactive crossbar, substantially parallel to said rotor axis, rigidly attached to said radially outward end of said each stator core, and having first and second radially inward surfaces, said first projection of said rotor sweeping past said first radially inward surfaces as said rotor rotates, and said second projection of said rotor sweeping past said second radially inward surface as said rotor rotates.
5 more elements
Dependencies are inferred from the claim text.