Motor brake on cordless power tools?

On battery-powered power tools, is the "electronic brake" feature simply a
short-circuit of the p.m. motor when the speed-control trigger is released?
Or is there some other, fancier braking juju being applied?

Thanks,

 

On every powered drill I've seen (including battery-powered), the brake
is mechanical -- when one lets go of the trigger, the spring allows a
plate physically connected to that trigger to press against the cam of
the motor. But you may be talking about something completely different
here.

 

Hmmm, at what year did your experience start ?
From mine I have yet to see a mechanical brake on a powered drill, but
then I have not pulled a modern one down (ie after about 1995.
Would it also be a place of origin issue since each country has it's own
standards ??

 

What kind of brake *have* you seen on drills? Do they use motor short-circuit
for "electronic braking"?
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DaveC

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Consumer-grade drills rarely have mechanical brakes; pro-grade drills
typically do.

 

Pretty much. My cheapo gets what looks like a 10ohm resistor put across the
motor.

 

The decent quality cordless drills I've seen do exactly that, generally it's
a low ohm resistor.

 

What make do you consider pro-grade. I have been involved in repairing
many makes of commercial drills , both corded and cordless , and have
never seen one with a mechanical braking system.

 

Milwaukee, Porter Cable and DeWalt come to mind.

I don't think that mechanical brakes have been around all that long, but
even my 9.6v Bosch, which isn't the top of their line, locks up with a
mechanical brake when the juice isn't flowing.

--
John Miller
Email address: domain, n4vu.com; username, jsm

Never let your sense of morals prevent you from doing what is right.
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