12 Volt DC Motor

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hillbilly

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Anyone know of a source for low voltage DC motors (12-24V), 1 to 5 HP, around 5000 RPM?
I know it's a odd request but it's for a "gizmo" (invention) that I'm working on.
thanks
steve
 
Steve, also check out electronics/hobby magazines, such as Nuts & Volts. They have advertisers who specialize in robotics equipment, which would certainly include low-voltage, high-power DC motors.
 
Hillbilly good luck finding one. Finding that much horse power in that low of voltage is a tall order. Have you considered a starter moror for a car?
 
dereckbc said:
Hillbilly good luck finding one. Finding that much horse power in that low of voltage is a tall order. Have you considered a starter moror for a car?
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What about electric golf carts, fork lifts, etc?
 
LarryFine said:
What about electric golf carts, fork lifts, etc?
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I thought about that too. My golf cart is 36 V @ 1500 Watts = 2hp and 42 amps. At 12 VDC you need 60-amps for every 1 hp, and 30-amps at 24 VDC. The point I am trying to make is at those low voltages getting 1-hp or more is a tall order reqyiring some very hefty amp-hour batteries, large gauge windings and supply conductors. I am just not sure there are many of those animals around. Only thing I can think of right off hand is a starter motor for vehicles (12 VDC) diesel (24-VDC)
 
dereckbc said:
I thought about that too. My golf cart is 36 V @ 1500 Watts = 2hp and 42 amps. At 12 VDC you need 60-amps for every 1 hp, and 30-amps at 24 VDC. The point I am trying to make is at those low voltages getting 1-hp or more is a tall order reqyiring some very hefty amp-hour batteries, large gauge windings and supply conductors. I am just not sure there are many of those animals around. Only thing I can think of right off hand is a starter motor for vehicles (12 VDC) diesel (24-VDC)
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I thought about a motor starter for a automobile engine. I don't know if they're rated in HP or how to get the specifications on them. I also considered a older model generator for a automobile, just running it backwards.
I may have to rig a "home made" dynamometer and check out a few different starters for torque and safe operating speed. I'm not sure that their communtators can tolerate the prolonged, high RPM that I will need.
I know it's a odd application, but the solution may be as close as the auto parts store.
Thanks
steve
 
Johnmcca said:
And they typically aren't rated to run for long, no cooling fans.
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That's absolutely correct. Starter motors are rated for extremly intermittent use under load, like a 25% or so duty cycly.

I agree that the best bet would be to raise the voltage if possible. You get as much power from batteries in series as in parallel.
 
LarryFine said:
You get as much power from batteries in series as in parallel.
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Larry that is not accurate. 2-strings in parallel have twice the amp-hour capacity. Batteries in series only raises the voltage.
 
The light just went on. A boat trolling motor might do the trick. Cooling could be an issue though since it relies on being submerged.
 
you could try a local forklift dealer for a used lift pump or power steering motor i dont think you will get 5000 rpm's but you will get the hp from the the 12 v or 24 volt motors (clark and yale contactors are cheep too)
 
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dereckbc said:
Larry that is not accurate. 2-strings in parallel have twice the amp-hour capacity. Batteries in series only raises the voltage.
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I have to disagree. As long as power is equal to volts times amperes, the same quantity of a given size of battery will provide the same power, whether in series or parallel.

Keep in mind that amp-hour capacity includes the ability to supply power over a period of time, which is not relevant to this discussion. That's like comparing amps and KwH.
 
The highest 12 volt gear motor i was able to find in a short search was a 12v 380 rpm motor that was continuous duty.Me thinks you are looking for a pink elephant :)
 
Another possible source for high power DC motors, though I don't know about the RPMs, is electric scoot motors. I've seen them that are rated around 700w at 24v DC. You might have to gear them up to get 5000RPM, though.
 
i think this might work a drive unit on an old yale model# mp 4000. the contactors and speed resistors are all one neat package and depending on your load you might get high rpms.(they had 12v & 24v models.)
 
Not sure how much you are expecting to pay.But the link I gave you has 24 v motors from 3 to 4.5 HP.4,000 to 6,000 RPM and with torque from 1970 oz. to 3840 oz..Prices range from $299 to $349.They are used in robotics.
 
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