beecrofter wrote:
On Sep 11, 1:48 pm, Ted Samuels wrote:
Spent about 6 hours finding and wiring a reversing relay for my 8 Amp, 58/105 DC
volt, shunt wound GE motor. Worked like an absolute charm but I decided to see if it
could stand being reversed without stopping. The smoke came out!

The field's still getting the full 58 volts but the armature voltage (sadly) is now
only
working between about 19 and 36 volts. (no longer up to 105 V)

Probably asking the impossible but can anyone offer any suggestions as to the
probable cause of failure. And might it be possible to strip out the speed control
circuit (if it is screwed) and run the motor at its full rated speed using current
directly from the full wave rectifier?

Had planned to to run this motor on a small lathe.

Thanks T

(Spam address)

All I know from my own experience is plug stop reversed motors fail
far far sooner than ones that come to a full stop before reversing, At
least this is the case on saw chain and mower blade grinders.

I never should have done it. I had the damn thing working perfectly.
I slowed the motor to a crawl and hit my newly minted reversing
relay switch. I half way knew something would go wrong but like I said
" the devil mad me do it."

Well now I know for sure what would happen. Better find out
before I went to the bother of replacing the existing motor.

Got to find some good in what I did. Perhaps it will save some one
else from the same fate.

Besides, I am retired and I like messing around.

Thanks
T