Patent ID: 6429568
Filing Date: 2002-08-06
Classification: H02K,Y10T

Abstract:
A rotatable electrical machine, comprising:an internally located rotor; and an externally located stator surrounding said rotor, said stator having an outer stator ring and an inner stator ring disposed in said outer stator ring, said outer stator ring and said inner stator ring each wound from at least one strip and being permanently connected together mechanically by at least one of said outer stator ring being shrunk onto said inner stator ring and said inner stator ring being shrunk into said outer stator ring; said at least one strip forming said outer stator ring having a longitudinal axis, a longitudinal edge and wedge-shaped notches formed therein along said longitudinal edge, said notches having an inner end, longitudinal axes directed at right angles to said longitudinal axis of said strip, and an opening angle dimensioned just sufficiently large enough for said wedge-shaped notches to just close after a winding process, said strip having a hole formed therein with a given cross section at said inner end of each of said wedge-shaped notches; said longitudinal edge of said strip being provided with a concave curvature between each two of said wedge-shaped notches, an opposite longitudinal edge having a convex curvature, and said two wedge-shaped notches defining a distance therebetween having a length L=Di*sin (&pgr;/(nsÂ±1/m)), where Di is an inner diameter of said outer stator ring, nsÂ±1/m is a number of sections between said wedge-shaped notches being necessary for winding a layer onto a mandrel, and an overlap of said sections from layer to layer determined by m.