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  #1  
Old 05-01-2006, 05:54 PM
jethro jethro is offline
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Unhappy Help with an electric motor!!??

I have been given a rather large DC motor that I would like to put to use on my grinder I am building. It is even coming with the controller for it!! Here is the bad part though, it is a 24vdc motor that pulls 250 amps under a full load. The name plate on this does not give any info on the motor, so the only thing I have to go on is what has been tested. I am beginning to think that a good used dc or 3phase motor with controller might be cheaper than making this work. I have considered running this on 2 deep cycle 12v batteries in series, but don't know how long I will be able to run it between charges.

I have found a nearly new tefc 2hp dc motor or a 1 1/2 hp 3phase tefc at a local machine salvage yard for $100. With controllers on ebay going for about $150, this might be the way to go. (btw, he also had a 16" serrated contact wheel without a hub he will sell for $30... it is a shame I used my last check on my way over... I will pick that up tomarrow. I already checked with chicago rubber on the price of the hub!! )

Sorry for the long post, but this is above me on figuring this out. I thought I could get a transformer and a rectifier but it is not looking good
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Old 05-01-2006, 06:34 PM
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Ray Rogers Ray Rogers is offline
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Sounds like that motor probably came off a fork lift or trolley system. Should have completely outrageous torque! I don't know how long it would run on a charge but it would probably be drawing a lot more power to run the motor than you would be able to really use. BTW, that much amperage can be seriously dangerous if you screw up.....


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Old 05-01-2006, 06:55 PM
jethro jethro is offline
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That is where is came from! It was on an electric pallet jack. Of course I wouldn't be putting enough of a load on it to ever pull 250amps, but I agree, could be very dangerous.
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Old 05-04-2006, 08:41 AM
jethro jethro is offline
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Motor Controllers....

Well, after looking at the motor at the machine salvage yard, I found out it was a Baldor CD6202 that has never been hooked up. I figured for a hundred bucks it would be worth it! SO, now that I have that I am looking at a controller on ebay. What features do you need for a controller for a belt grinder? I don't really think that a reversing switch is a big priority, what else should i look for?

Thanks,
Mike
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Old 05-04-2006, 09:15 AM
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Ray Rogers Ray Rogers is offline
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What you should look for is a controller that handles the voltage range, horsepower, and the amperage of your Baldor motor ........


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Old 05-04-2006, 10:53 AM
jethro jethro is offline
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Thanks, there is a chassis mount on ebay that looks like it will do the job for under $60 shipped. I will just have to put it in an enclosure and add a pot. Thanks for the help!

Mike
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