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 01-16-2008, 10:41 Post: 150254
Murf



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Join Date: Dec 1999
Location: Toronto Area, Ontario, Canada
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 Smittybuilt winches

What Joel is talking about is a runaway motor and it requires that there be NO load on a series wound motor at all, and yes, the speed will continue to rise until the motor grenades itself.

However in something like a winch, there is always a mechanical design that won't allow for the motor to run in a "no load" situation, usually they have the motor directly coupled to a gear reduction unit, then use a sliding gear to obtain a F-N-R for the spool, but the gear reduction is always turning and is more than enough load to hold the motor back.

Best of luck.






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 01-16-2008, 16:15 Post: 150264
Murf



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 Smittybuilt winches

A permanent magnet motor is the type that has a relatively constant speed regardless of load or not (within reason of course).

As a bit of trivia, series would motors are also able to run on AC as well as DC, but will not reverse direction if you swap hot & neutral since the shift in the field will neutralize the change in polarity and it will still turn the same direction.

EW, the runaway motor will always run afoul of Murphy's Law long before it violates any laws of fizziks (BTW, there's no 'c' in fizziks Wink yeah right ) since the bearings will fail or the field coils will pop out and jam between the armature & case before it gets too much above design speed.

I bet if you open up one of those Warn planetaries you will find that the motor is always turning the reduction.

Best of luck.






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