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 01-15-2008, 09:34 Post: 150223
kleinchris



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Anybody have any knowledge about this brand? Or, this particular winch?






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 01-15-2008, 09:57 Post: 150226
candoarms



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Kleinchris,

This Smittybuilt winch uses a permanent magnet type motor. In all of the articles I've read on winches, they frown on these things. Series wound motors are much better.

___________________________________

The new Smittybilt XRC-8 Winch encompasses all the best features you would want in a winch. Every XRC-8 (8000 lb) winch features a 4.1HP ---- Permanent Magnetic ------- Motor and a Planetary Gear System with 265:1 gear ratio that will deliver you power and reliability without hitting your pocket book.

_________________________________________

Please look into the differences between permanent magnet and series wound motors. I believe you'll find that the permanent magnet types have a very poor reputation.

Joel






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 01-15-2008, 17:11 Post: 150232
kleinchris



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I will check into that- I was sure that this was an issue of you get what you pay for. Northern has a Warn or Ramsey (+8000#'s) for a couple hundred more.






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 01-15-2008, 17:37 Post: 150233
earthwrks

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SmittyBuilt has been around for as long as I can remember--but building offroad stuff. This winch is likely a Chinese-built one. And Joel is right about PM motors. The cheaper they are the quicker they lose their magnetism, and even quicker when the heat up--and they will. I have had many a winch; Warn being my mainstay. Keep in mind under full load an 8000 Warn can draw as much as 480 AMP if memory serves. At no load that still is 80-100 AMP.

If this is for a tractor (or even a truck) consider going hydraulic. On a small truck they connect to the power steering pump. They typically have less pulling power pound for pound so you may have to get a 9000 to equal an 8000 electric. For a tractor, you can hook it up to your loader or rear remotes. As far as price they can be a bit more than a hydraulic----buuut if you go a junk yard that has a roll-back truck or a wrecker or an off-highway utilty service truck thay can have some really inexpensive winches.

Another option is Harbor Freight, and you probably get a 2-year warranty cheap too before you destroy it.






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 01-15-2008, 17:49 Post: 150235
candoarms



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Kleinchris,

Up to about 3000 lbs pulling power, a permanent magnet type motor is fine. Above that, a series wound motor is much preferred.

The difference between the two types is very difficult to explain here, but I'll try.

In a permanent magnet motor, the field is constant. This means that the power doesn't change with the demand placed on it.

A series wound motor has a field that varies depending on amperage draw. The harder you work the motor.....the higher the current demand.......the stronger the field becomes.

There is a drawback to series wound motors. When under a no-load condition (free wheeling), the series wound motor tends to over rev. A permanent type motor won't do this.

Joel






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 01-16-2008, 07:15 Post: 150246
earthwrks

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Joel, I'm confuthesed on your statement that a serieswound motor over-revs. How is that possible? I mean, if you only have so much power going in...

Are you thinking like a car starter sounds after it disengages? If so (and that's the only thing my lil' brain could think of that you might be referring to), it's not over-reving, just coming off being under load.Another exmaple is a power drill that speeds up after drilling through something--no load.






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 01-16-2008, 10:41 Post: 150254
Murf

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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, 12:12 Post: 150257
kthompson



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Where are series wound motors used? I know there is a design that runs as the same rpms regards of whether loaded or not (at least up the ability of the motor to handle the load). They are used in both DC such as fan motors and AC again such as fan motors or even tool motors such as saws. kt






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 01-16-2008, 12:12 Post: 150258
candoarms



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Earthwrks,

I tried to find something on the internet that would help answer your questions. One of my favorite internet sites is gizmology.net

Murf is correct, in that the gear box installed on the end of the motor's shaft will provide just enough resistance to prevent a series wound motor from destroying itself.

The link below will take you through the advantages and disadvantages of the various DC motors. While series wound motors are more powerful, hybrid motors have been developed to overcome their shortcomings.

This link will provide the answers to at least a few of your questions.

When you're done reading the info on the DC motors, please check out the other interesting things found at Gizmology.net It's a neat place.

Joel






Link:   Notes on Motors -- Gizmology.net 

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 01-16-2008, 12:13 Post: 150259
earthwrks

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A runaway electric motor? errr?

Murf, the Warn planetary-reduction winches don't have F-N-R; direction is controlled through a floating (case) ground via solenoids. However, when freewheeling the planetary drive does have a gear that does disengage from the spool.

The runaway motor still seems like it would violate some basic law of fizzicks. But what do I know---I defer to Kenny.






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Discussion Boards > Active Subjects > Messages as Posted > Tools - Shop Tools Forum

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