N
NG Neer
I recently had a good quality corded drill fail after less than 4
years (see link for pictures/details). I just read that running such
tools with very long or thin extension cords can make them fail, due
to the voltage drop in the extension cord causing the motor to draw
excessive current.
I've always known that running an induction motor on low voltage
causes execssive current and overheating, but I don't see how that
could be the case for "universal" motors with commutators. I mean,
isn't that how the trigger varies the speed of the drill, by reducing
the voltage to the motor? Reduced voltage due to losses in your cord
should just make the drill run slower, unless am I missing something
here??
link: http://mysite.verizon.net/rvotin/Dewalt_drill_failure.htm
years (see link for pictures/details). I just read that running such
tools with very long or thin extension cords can make them fail, due
to the voltage drop in the extension cord causing the motor to draw
excessive current.
I've always known that running an induction motor on low voltage
causes execssive current and overheating, but I don't see how that
could be the case for "universal" motors with commutators. I mean,
isn't that how the trigger varies the speed of the drill, by reducing
the voltage to the motor? Reduced voltage due to losses in your cord
should just make the drill run slower, unless am I missing something
here??
link: http://mysite.verizon.net/rvotin/Dewalt_drill_failure.htm