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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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 01-17-2008, 08:34 Post: 150277
kthompson



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  Smittybuilt winches

I have attached a link that explains electric motors. Did find in it the famous Murf is correct on dangerous speeds he mentioned. My hero (move over EW)! Smile kt






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 01-19-2008, 07:44 Post: 150440
earthwrks

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  Smittybuilt winches

Kenny--whew! Good to know that I gotta "move over" 'cause I was just going to send you a thumb for your excavator---but NOW I don't need to---BUDDY! ;P






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 01-19-2008, 08:24 Post: 150442
candoarms



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  Smittybuilt winches

Kenny,

I always believe it best for a fella to discover the truth for himself......and preferably NOT the hard way.

Too bad it cost you a thumb for your excavator, though. hehehe.

Joel






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