Recent content by ProWinder

Yes it is the brush type. Thank you for the info.

Thanks for the link. I did not find that thread when I did a search.

I want to test run a sync motor in the shop location. I have no name plate to get information from. I know the stator is 2300 VAC, 1200 rpm. Can I test run the motor as a squirrel cage motor on 600 VAC, leaving the rotor leads open? In doing this will the rotor work as an auto transformer and...

EngRepair, There are six leads out to be connected in parallel. (It is a 2 star connection) You could have one single lead but it would be a much larger conductor size. Span is the same all coils. The turns are all the same for each coil as well.

Thank you for the information. electricpete, I would like to know what school you're attending to learn all this information. I have only got on the job learning (12 years) with zero schooling on theory. I am also apart of a joint apprenticeship committee with my employer. It would be great to...

Water in the windings due to condensation can cause the windings to be grounded. Then upon start up it will break down and let the smoke out.(LOL)

Can any one please explain to me why this motor is connected in this manner. Thank you

Thanks, that is what I thought it would be. Just wanted to be sure.

At what rpm does a wound rotor motor have full nameplate horse power? Will it have the same horse power regardless of the rpm it turns at?

Well we found out the problem. The internal connection of one inter pole was pinched against the series winding leads. This gave us bucking fields. Once we isolated the two the motor ran just fine.

The drum switch is part of out test panel. The test panel was built 40 years ago. I think I will have to try running the motor from a welder to avoid using the test panel. I don't think the test panel is the problem, or the drum switch for that matter. Thanks for the help I will try a few of...

when s1 and s2 are switched the motor changes direction. however it will not change direction when we switch the drum switch to reverse the motor.

Waross, if this was the case should the motor still turn ccw or would it just not run at all? With the motor apart I did trace the leads and did not see any thing stand out to be out of place.

The wiring diagram for the drum switch I don't have. The connection does match the diagram you posted. I have run other series motors without any troubles of reversing direction with the test panel we are using. This motor is should be easy to test run but doesn't make any sense.

This is a series motor. I did change just the a1 and a2 leads, no change in direction. Change s1 and s2 and the motor will turn the other way. This is done and the drum switch that we are using is switched the same way with the motor leads in different locations. The strange part of this is...