Generator with ferromagnetic teeth

Abstract

A stator assembly for use in a superconducting generator operated at frequencies up to 10 Hz is disclosed. The stator assembly includes a ferromagnetic stator winding support having a plurality of teeth defining slots, the slots configured to receive and support stator windings. The stator winding support is formed so that the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.65 to 0.90.

1 . A stator assembly for use in a rotating electrical machine, the stator assembly comprising:
 a stator core including a plurality of teeth defining slots therebetween, the slots configured to receive and support stator windings,   the stator core being formed of a ferromagnetic material, and   wherein the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.65 to 0.90.   
     
     
         2 . The stator assembly of  claim 1 , wherein the slots are elongate, radially extending openings formed in the stator core. 
     
     
         3 . The stator assembly of  claim 1 , wherein the teeth extend radially inward and are mutually circumferentially spaced apart. 
     
     
         4 . The stator assembly of  claim 1 , further comprising at least one stator winding disposed in a slot; the stator winding including a coil formed of plural bundles of conductive wires. 
     
     
         5 . The stator assembly of  claim 1 , wherein the stator core includes an assembly of laminated plates. 
     
     
         6 . The stator assembly of  claim 1 , wherein the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.70 to 0.90. 
     
     
         7 . The stator assembly of  claim 1 , wherein the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.75 to 0.90. 
     
     
         8 . The stator assembly of  claim 1 , further comprising a stator winding including a straight portion, wherein the straight portion is disposed in one of the slots and the straight portion is configured to substantially fully occupy the slot. 
     
     
         9 . The stator assembly of  claim 8 , wherein the cross sectional area of the straight portion is substantially the same as the area of the slot 
     
     
         10 . The stator assembly of  claim 1 , further comprising a stator winding including multiple stator winding straight portions disposed in each slot. 
     
     
         11 . The stator assembly of  claim 10  wherein the cross sectional area of a straight portion is substantially half the area of the slot, and two stator winding straight portions are disposed in each slot. 
     
     
         12 . The stator assembly of  claim 1 , further comprising at least one stator winding, the stator winding comprising a cranked coil winding. 
     
     
         13 . The stator assembly of  claim 1 , further comprising at least one stator winding including individual wire conductors arranged within the slot so that a radial conductor dimension is at least a factor of 1.5 larger than the circumferential conductor dimension. 
     
     
         14 . (canceled) 
     
     
         15 . The stator assembly of  claim 1 , further comprising at least one stator winding including individual wire conductors arranged within the slot so that a radial conductor dimension is at least a factor of 3 larger than the circumferential conductor dimension. 
     
     
         16 . A rotating electrical machine comprising:
 a rotor assembly; and   a stator assembly, the stator assembly including a stator core including a plurality of teeth defining slots, the slots configured to receive and support stator windings,   the stator winding support being formed of a ferromagnetic material, and   wherein the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.65 to 0.90.   
     
     
         17 . The machine of  claim 16 , wherein the rotor assembly includes a rotor having high temperature superconducting windings. 
     
     
         18 . The machine of  claim 16 , wherein the rotor and stator assemblies are configured to operate at frequencies up to 10 Hz. 
     
     
         19 . (canceled) 
     
     
         20 . (canceled) 
     
     
         21 . The machine of  claim 16 , wherein the stator core is configured to have a tooth flux density during operation that is greater than 1.8 T. 
     
     
         22 . (canceled) 
     
     
         23 . (canceled) 
     
     
         24 . (canceled) 
     
     
         25 . (canceled) 
     
     
         26 . The machine of  claim 16 , wherein the stator core is configured to have a tooth flux density during operation that is greater than 2.8 T. 
     
     
         27 .- 30 . (canceled) 
     
     
         31 . (canceled) 
     
     
         32 . (canceled) 
     
     
         33 . A wind turbine comprising:
 a rotating electrical machine, said rotating electrical machine having   a rotor assembly; and   a stator assembly, the stator assembly including a stator core including a plurality of teeth defining slots, the slots configured to receive and support stator windings,   the stator winding support being formed of a ferromagnetic material, and   wherein the ratio of the sum of the widths of the slots to the sum of the widths of the teeth and slots is in the range of 0.65 to 0.90.