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Hey thanks Waross, I should have been more specific in my original post. I am primarily concerned with the transition from the amortiseur winding to the rotors poles. The reason I’m looking into it is we’ve had some questions on sync motors failing to synchronize. I’m training to gain a...

Hello, I’m looking for some information on the controls and logic for starting a brushless synchronous motor. Any references or resources for these shorts of motors and controls would be greatly appreciated. I just find them interesting and would like to understand them a bit better. Thanks!

Pete and Waross, You’ve certainly given me a lot to think about. I greatly appreciate an outside perspective when we come across something unusual like this. I find great value in these forums of experts with many years of experience. I will continue to try out your suggestions and I’ll...

Composite, This was just an instance of poor wording on my part as you said. Our initial assumption when we noticed the odd readings was that there was an error in either our setup or our equipment. We eliminated the equipment being faulty by measuring three other stators of known resistance...

An interesting anecdote that may, or may not be, relayed popped into my head after we encountered this issue. A few years ago we were using our AWA to conduct an incoming test on an assembled MV motor. The motor was passing every test (500V RTG, DV HiPot, and surge comparison test) but was...

Yes the AWA is a 4 point measurement using 3 kelvin clips to take the readings. The alligator clips of the tester are clamped on the barrels of the ring terminals which have been sanded and cleaned. We actually tested this motor with a PDMA as well which it sounds like you are familiar with...

Pete, That’s some good info, thanks for sharing. The earlier measurements were taken before the terminals were installed. However, using two of our other measuring instruments we are not seeing the resistance imbalance we are getting on our AWA. We verified that the AWA is still measuring...

Waross, We are testing the winding resistance between each lead (3 lead motor) using a Baker AWA. The AWA has three alligator clips for connecting to the motor ring terminals which were crimped to the lead wire and soldered. The subsequent tests are erratic in that they are random, but are...

Hi everyone. I’ve recently come across an interesting test result on a 1000HP 2P motor we rewound and are preparing to ship. When taking phase-to-phase resistance measurements through the winding process (done before and after a global VPI) the resistance imbalance was less than 1% across...