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Old 01-17-2012, 05:23 PM   #1 (permalink)
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does siamese motors+dual controllers=cheap speed?

If I sourced two identical forklift motors (8" or 9", one with twin shafts, siamesed via a coupler. Then ran each with separate motor controllers (OpenRevolt) and seperate 144V battery packs, direct drive to 4.11 gears in a featherweight Datsun PU.

Figure I could get that done for about $4k plus my time for fabrication, and saving up for batteries when the day comes.

Is there a more budget friendly recipe? 11"-13" forklift motors? Is there a bigger OpenRevolt controller in the works?

Looking for 6 second runs to 60, 70 mph top speed, and a 40 mile radius.


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Old 01-17-2012, 05:31 PM   #2 (permalink)
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I believe Paul is working on a 1000A version of the OpenRevolt controller. In fact I think Ben Nelson may have recently toasted the test controller.
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Old 01-17-2012, 06:11 PM   #3 (permalink)
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I don't see any flaws in this idea as to why it wouldn't work.
Even if you get a 1000amp open revolt controller, you can still do this with the motors and if you can find a relay large enough to handle the amps you could even switch from parallel to series and have a high/low affect.
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Old 01-17-2012, 10:02 PM   #4 (permalink)
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Quote:
Originally Posted by Daox View Post
I believe Paul is working on a 1000A version of the OpenRevolt controller. In fact I think Ben Nelson may have recently toasted the test controller.
haha. Yes, I figured out the problem too! At least I think I figured it out. Next attempt to be completed in the next couple weeks. And if that blows up, I've got another idea, and if that blows up I'll start crying.
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Old 06-26-2012, 03:07 PM   #5 (permalink)
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Quote:
Originally Posted by WarWagon View Post
If I sourced two identical forklift motors (8" or 9", one with twin shafts, siamesed via a coupler. Then ran each with separate motor controllers (OpenRevolt) and seperate 144V battery packs, direct drive to 4.11 gears in a featherweight Datsun PU.

Figure I could get that done for about $4k plus my time for fabrication, and saving up for batteries when the day comes.

Is there a more budget friendly recipe? 11"-13" forklift motors? Is there a bigger OpenRevolt controller in the works?

Looking for 6 second runs to 60, 70 mph top speed, and a 40 mile radius.
totally possible and very cost effective. I would steer away from 8", try to pick a few 9"s or 11"s, clean them up and rebuild them with higher performance parts, advance them so you can run a higher voltage and you should be good to go. pick up two of paul's 1000A controller coming out soon and you will have a rocket.

ive seen people picking up forklift motors for 200$ and rebuilding them for 200$ so 400$ each motor and 600$ each controller = 2000$ for a dual system, not 4000$.

1000A into a standard non-performance 9" forklift motor should be about 220fltbs, so 440fltbs should be plenty to get you a nice 0-60, better than 6 seconds* (*traction dependent)
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Old 06-26-2012, 07:22 PM   #6 (permalink)
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I would love to do an inexpensive drag racing setup.

Something like what was stated here sounds pretty reasonable.
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Old 11-17-2012, 02:20 PM   #7 (permalink)
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Quote:
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haha. Yes, I figured out the problem too! At least I think I figured it out. Next attempt to be completed in the next couple weeks. And if that blows up, I've got another idea, and if that blows up I'll start crying.
i seen the buildmanual online for the "smaller" version of the controller , im wondering if you cant just put longer buslines on it and connect two of those kits in series with one controllerboard
from wat i understand each bank switches a small amount of the power on and off at increasing speed to ranp up the power to the motor so doubling up on the amount of switches should double up the powerrating too as long as the copper buslines can take it

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