Patent ID: 6191517
Filing Date: 2001-02-20
Classification: H02K

Abstract:
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.