Patent ID: 9543814
Date: 2017-01-10
CPC Classifications: C23C,H02K

Claim:
1. A method of making a heat transfer element for an electric machine having a plurality of windings with end turns and the heat transfer element has a body defining a face for contacting the end turns to transfer heat via conduction from the windings, the method comprising: placing at least the face of the heat transfer element in an expanded state by heating the body; applying a dielectric coating on at least a portion of the face contacting the end turns while the face is in the expanded state, wherein applying the dielectric coating includes applying the dielectric coating via plasma coating; and placing the dielectric coating in a compressed state by cooling the heat transfer element; wherein subsequent expansion of the body in response to an application of heat results in the expansion of the dielectric coating to move it from a compressed state to an uncompressed state, thereby reducing the likelihood of crack propagation in the dielectric coating during the expansion of the body.