Curious... Anyone smoked a motor with Tetrix ptc

[vamfun]

Originally Posted by Teched3

Even with the PTC, motors can burn out under stall conditions. They do not react quickly enough. ....

Did you actually experience this with the Tetrix motors or is this a more general statement based upon your experience?

Perhaps more people would have responded if I had asked if anyone had stalled the Tetrix motors and were saved by PTC's.

I ran an informal PTC test and posted the results on my blog. Our minibot ran ok with the PTC's and was slower than predicted because of the power loss. A little friction in the drive train and the minibot tripped about half way up.

I'd like to remove the PTC's but we are driving the motors on separate axles and I'm not sure that the 5 amp fuse would do any good. I expect that if one motor blows, the other will also. So, I am in agreement that the GDC should have allowed separated fusing.

[Teched3]

Yes, in testing, the PTC feeds offer more protection, but if you're working the motors on the edge, it's a slippery slope to failure. Our only failure with the PTC occurred when one motor lead disconnected, and all the current transferred to the functional motor. Weight reduction, proper speed selection, consistent deployment on the pole, are the keys to speed and dependability. Why the GDC doesn't allow individual fusing of motors along with a main fuse still evades me.