Patent ID: 9537364
Date: 2017-01-03
CPC Classifications: H02K

Claim:
1. An expansion sheet for a rotary electric machine, the rotary electric machine having a core and a plurality of coil conductors, the plurality of coil conductors are housed in a slot formed in the core, the expansion sheet comprising: a first layer portion having a first surface positioned on a side of the expansion sheet on which the plurality of coil conductors are located, the first layer portion extends across at least two coil conductors of the plurality of coil conductors, the first layer portion includes a first epoxy resin composition that expands when heated; and a second layer portion having a second surface positioned on a side of the expansion sheet on which the core is located, the second layer portion includes a second epoxy resin composition that expands when heated; wherein the first layer portion has a first expansion ratio higher than a second expansion ratio of the second layer portion such that an amount of volume increase, caused by expansion of the first epoxy resin composition when heated, of the first layer portion is higher than an amount of volume increase, caused by expansion of the second epoxy resin composition when heated, of the second layer portion.