Quote:
|
Originally Posted by maxlobovsky
Today we had an FP burn out on us when using it as the winch in our forklift. I'm trying to figure out why it happened and i was wondering if anyone had experience with them burning. Potential causes in this case were
a side-loaded output axle
sawdust, aluminum shavings, or other particles in the motor
stalling
Because the motor has a 70 amp stall current and we had the 40 amp breaker on and because it stalled at most for 2 or 3 seconds before releasing serious smoke, I'm tending to think something got inside. If anyone has any idea, that would be a great help, thanks.
|
The Fisher Price motors are EASILY the highest power per volume motor in the kit. More importantly, it has the highest power per surface area of the motor.
Since power in = power out + heat generated, the heat generated per volume is much larger than the other motors. Again, more importantly, the heat generated per unit surface area is larger than the other motors in the kit.
Since heat disipated is proportional to the (surface area * Delta T), basically, the delta T of this motor (its rise in temperature above ambient) is higher than other motors in the kit.
Bottom line: We FIRST teams toast more Fisher Price motors than your typical dinner toasts bread ;-)
Try not to stall them for very long (if ever) and you will be fine, run them near stall for more than a hand full of seconds is just asking for the sickening smell of fried insulation.
Joe J.