[Flyingsod]

I worked for a motor shop. When I asked the actual motor techs for that same thing I was told it’s basically going to be different for each motor and to just worry about each winding being equal.

An option for me was to grab their winding data and calculate the resistance per winding. After a short attempt I had to agree with them, every motor will be different depending on its design. You will literally need a chart for every manufacturer and every line of motors they’ve ever built. For the information gained it wasn’t worth the effort.

 

[Flyingsod]

It seems to me that it would be very difficult to generate a standardized static winding resistance chart for the industry because of design variations between manufacturers, I'm probably wrong on that.

You are not wrong. Any chart purporting to be a “general” motor winding resistance chart is going to be wrong so often as to be useless.

Concerning the fuses blowing, it’s rare but there can be a short that only “activates” when the massive magnetic field of full amperage pushes the winding around. I was never involved but I believe the shop used a giant variac thing to diagnose it. Without a motor shop or mobile motor tech I don’t know of anything we can do in the field to test for that. I would take the motor to the bench and try to run it on a known good starter circuit. If it still has issues it’s new motor time. Or rewind depending on what it is.

 

[Flyingsod]

The further behind you get on the speed curve the higher the amperage. So if there isn’t enough power in your starting configuration to speed it up fast enough current will be way higher than expected. That’s one way an improperly designed low voltage starter can get into trouble. It has to be designed so it can speed up fast enough.

 

[Flyingsod]

You will have a very hard time offending me by making suggestions with the intent to help.

Challenge accepted. J/k

 

[Flyingsod]

Ohmmeter resistance is only valid for DC. It does not account for inductive reactance or back EMF.

It may not tell us what the circuit will do in an AC situation but it can certainly be used to check the condition and veracity of wiring, no matter what type of voltage will eventually be applied. And that’s all this thread is about, investigating circuits.