Spacer block pattern for electrical inductive apparatus

Claim 1

A winding assembly for fluid-cooled electrical inductive apparatus, comprising: a core-coil assembly including a core leg having an axially extending core center line and a plurality of stacked pancake coils each having a plurality of conductor turns disposed about said core leg; and at least one spacer insulating sheet washer disposed between adjacent pancake coils, each washer having upper and lower straight ends, four curved corners, and two straight leg portions coextensive with corresponding portions of the pancake coils; each washer having a plurality of rectangularly shaped blocks having a geometric center and a longitudinal axis which extends through said centers, said blocks extending outwardly from at least one side of its associated washer and in contact with a pancake coil; said blocks being disposed in predetermined spaced relation comprising a plurality of blocks arranged in spaced rows; said spaced rows being vertically oriented in the upper and lower end portions, horizontally oriented in the two leg portions, and oriented at substantially a 45 degree angle in the four corner portions, the rows of each washer all being located with reference to the core center line, to align the rows throughout the stack of pancake coils, the blocks of any one row all having a like orientation, with said blocks being oriented with their longitudinal axes at substantially a 45 degree angle with respect to a line drawn through the centers of the blocks.