Solder Throw in DC Armature

Dear Mr.John DG

Thank you for reply. Any short in armature should have been refelected in Armature milli volt drop between seqments.But here we find uniform pattern like first two seqment one value and third seqment one value repeats this cycle in half part of commutator and other half of part seqments have one seqment one value and next seqment one value and this cycle repeats.How to know there is a short.This was original data when armature came also same. Motor came for just overhauling to us.Total Seqments 99 and pole is 4. one dummy coil found.Let us know what type of armature winding to follow this pattern of millivolt drop

Regards

Sadasivam

It still needs a rewind, though with such a small motor, it might be worthwhile scrapping it and replacing it instead.

A GA. Now, how long till he listens to you?

Let's see. Current is too high. Solder is coming out. Mmm? That probably means too much power dissipated in the motor. That probably means one or more shorted turns. Oh, yeah, you already got that answer. Quit resoldering and rewind.

I have met such people before (many times sadly), they only want ONE particular answer, no other answers are acceptable to them....

For us, when trying to help them, its a bit like bashing your head against a brick wall, its nice when you stop!!!

In this particular case it shows a complete lack of some significant basic knowledge of how a (any?) particular motor works, what has gone wrong and how it needs to be repaired......all the signs were there (and several good posts from several good people!).....the signs and the answers were simply not understood....

Hey Joe^[1],

Not sure what's going on here. What's a "growler"? Not familiar with the term (except re dogs (& bitches)).

[1] bet you wish you had a dollar for every time some smart-a$$ came out with that one!

Dear All

Thank you for all your comments on subject above, We have identified the fault that interpole connection at briusholder need to be changed.Load test done no armature draws rated load current.Let us close the topic now please

Regards

Sadasivam

Cheers, Andy. Handy technique.

I really cannot say if they are still used or not......

I was on several DC ships in the RN, we used such things daily......then!

Hi John, Andy answered this question better than I could have, I had never thought of shorting out the armiture to test for open circuits, usally for testing for open circuits I run the motor and examine the comuntator to see if there is what appears to be arcing forming around the comuntator, when it is operating and if there is arcing, I would usally remove the brushes and measure the resistance of the windings across the armiture segment by segment, the reading should always be low, then if we get a reading that is say 10 x + higher that is where the open circuit is.

I think Andy deserves a vote!

Cheers

Joe

You are too kind, that was a small part of my job in the RN many years ago.....

I enjoyed remembering it again....

Good and accurate post.

Hi Andy, yes it brings back memorys, I also have not used one for about 30 Years.

Cheers

Joe