![]() ![]() What tests do you recommend for a motor’s insulation system? You’re looking at several different tests for each of our various types of insulation. You can’t just test the entire insulation system at once. Here’s another bummer for your Friday morning. Both turn-to-turn and phase-phase insulation fall under the category of copper-to-copper insulation, for the record. ![]() Unfortunately, this is the weak link in an insulation system (usually). Finally, your turn-to-turn insulation is going to protect the copper on your motor’s windings or coils. Phase-to-phase insulation is usually a sheet of insulation paper – you guessed it – squished between the phases. In a typical induction motor, the groundwall insulation is a bodyguard to the insulated copper to ground – made of slot liner paper. Inside your motor, you’ll find groundwall, phase-to-phase, and turn-to-turn insulation. What does my motor’s insulation system look like? Once you’ve got that covered, we’ll give you the go-ahead to grab your trusty tester. ![]() What about the other 40% of insulation failures?īefore you jump right into testing your motor, you need to understand what’s happening inside of motor, specifically – the insulation aging process. As a loyal blog reader, you already know that when we are talking about motor failure – 60% of insulation failures are caused by excessive heat, since you’ve already read Motor Mayhem – of course.
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