Stator structure for electrical machine

Claim 2

A stator structure for a cryogenic electrical machine comprising: an inner support shell of electrically insulating material; a stator winding unit carried by and fixed to said inner support shell and including a central part in which the stator winding conductors extend axially along said inner support shell, two end parts each having a transverse section in which said conductors extend transversely to their axial direction, an intermediate section in which the conductors extend between a said end part and said central part, and an end section in which said conductors are interconnected in a predetermined pattern; an outer torque shell of electrically insulating material extending beyond said end sections and having transversely extending filaments surrounding and fixed to said stator winding unit for mechanically supporting and electrically insulating said stator winding unit from the frame of said machine; each of said end parts including end spacers for securing said conductors in the area of a said end section and being interconnected with said outer torque shell; and a torque member interconnected with said torque shell and with said end spacers, and an end member interconnected with said torque member and said inner support shell.

Claim 3

The stator structure of claim 1 in which said central part includes tapered elements lodged between said conductors to compensate for the increase in the space between said conductors with increasing radial distance each of said conductors being bonded to said tapered elements on either side of it and to adjacent ones of said shells, and bonding material being disposed between and around said conductors to bond them to each other.

Claim 4

The stator structure of claim 1 in which each of said conductors includes a plurality of conductor bundles, each of which includes a plurality of conductor strands covered with an insulating bonding material.

Claim 5

The stator structure of claim 1 in which said conductors in said transverse section extend helically about said structure.

Claim 6

The stator structure of claim 1 in which said conductors in said end sections are separated by spacer elements of electrical insulating material, and are bonded to said spacer elements, there being a number of layers of said conductors and said end spacers extending partially radially between said conductors in said end sections of the outer most layer.

Claim 7

The stator structure of claim 2 in which said outer torque shell filaments are looped about and engage said torque member.

Claim 8

A stator structure for a cryogenic electrical machine comprising: an inner support shell of electrically insulating material; a stator winding unit carried by and fixed to said inner support shell and including a central part in which the stator winding conductors extend axially along said inner support shell, two end parts each having a transverse section in which said conductors extend transversely to their axial direction, an intermediate section in which the conductors extend between a said end part and said central part, and an end section in which said conductors are interconnected in a predetermined pattern; an outer torque shell of electrically insulating material extending beyond said end sections and having transversely extending filaments surrounding and fixed to said stator winding unit for mechanically supporting and electrically insulating said stator winding unit from the frame of said machine; and a first pair of pins positioned on either side of said outer shell and an insulating strap forming a closed path wound about one pin at least once, wrapped at least once about said outer shell, wound about the other pin and wound again about said outer shell, and a second pair of pins positioned on either side of said outer shell and oriented transversely to said first pair of pins and an insulating strap forming a closed path wound about one pin, wrapped at least once about said outer shell, wrapped about the other pin, and wrapped again at least once about said outer shell, and mounting means for supporting said pins.

Claim 9

A stator structure for a cryogenic electrical machine comprising: an inner support shell of electrically insulating material; a stator winding unit carried by and fixed to said inner support shell and including a central part in which the stator winding conductors extend axially along said inner support shell, two end parts each having a transverse section in which said conductors extend transversely to their axial direction, an intermediate section in which the conductors extend between a said end part and said central part, and an end section in which said conductors are interconnected in a predetermined pattern; an outer torque shell of electrically insulating material extending beyond said end sections and having transversely extending filaments surrounding and fixed to said stator winding unit for mechanically supporting and electrically insulating said stator winding unit from the frame of said machine; and a first pair of pins positioned on either side of said outer shell and an insulating strap forming a closed path wound about one pin at least once, wrapped at least once about said outer shell, wound about the other pin and wound again about said outer shell, and a second pair of pins positioned on either side of said outer shell and oriented transversely to said first pair of pins and an insulating strap forming a closed path wound about one pin, wrapped at least once about said outer shell, wrapped about the other pin, and wrapped again at least once about said outer shell, and mounting means for supporting said pins.