New, machine-based resin impregnation  processes

Bill Ashley

 Modern machine-based impregnation processes are highly efficient and cost effective, and result in excellent impregnation quality in random- and  form-wound coils for most designs of LV windings. Using suitable  impregnating resins, these processes are also clean producing virtually  zero VOCs. (42 / 42)

 The benefits of these processes come from the resin application methods,  which result in near-100% slot fill, and from the curing methods, which  result in near-100% resin retention, giving excellent impregnation  quality. This paper contrasts different application methods. For instance,  application of resin by the Trickle process is particularly suitable for  two-component resins having very short pot life, which can be mixed at the  point of application, whereas stable, one-component resins are suitable  for immersion methods. It also compares the rapid and precise heating  methods employed on machines, such as Joule effect heating (i.e. by  passing DC current through the windings) and indirect heating using  infra-red or induction, with more traditional oven heating. (116 / 158)

 These machines often operate on short cycle times, resulting in high  productivity, minimal WIP and excellent ROI, and can also be introduced  into modern production flowlines, making them suitable for JIT  manufacture. (32 / 190)

 This paper discusses some of the more salient issues of importance to  today's electrical machine manufacturers. (16 / 206)

<wjashley@newtech.ltd.uk>