[jbman]

Hey folks,

I'd like your opinion on a motor. They included several pictures, so I'm trying to make sure I know what to look for on this motor or a different one in the future.

https://www.ebay.com/itm/273503659982

The commutator appears darkened, but is it "scorched"? What does an appropriate film look like?
I see four terminals, but is this motor sepex or series?
There are two sets of plugs on the sides - would those be a temperature switch and thermistor, perhaps?
The bearing at the front is not sealed. I'm not sure if a seal goes over the top of it like on a pinion or wheel bearing; is this a concern?
Is the overall condition of this motor too poor?
Additionally, it's pretty pricey - I've struggled to find good prices on forklift motors locally or even on eBay, so I'm doing what I can.

Thanks a lot! I'm trying to scout out a motor for my CJ7 conversion that I'm planning.

 

[jbman]

My opinion is that they're charging 4x what it's worth.

Go to, or call up a local forklift repair yard and ask for old DC motors they may have sitting around. You'll get something better for closer to $200.

I have been struggling to find a forklift yard locally. That's the only reason I'm looking online. I'll keep checking, and I agree the price is high. Just trying to get a better idea. Thanks!

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[jbman]

Dunno if you wanna say where you are, but... the thing about forklifts is literally everywhere in the industrial world has to have a place that services them in just about every city over 50,000. Everyone needs forklifts, everyone needs a place to fix them.

That's the realization I came to after reading some more. I looked up repair shops instead of salvage yards, and I found a few local ones and sent out some messages. I'm in Colorado Springs.

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[jbman]

Re: fissiks

Hi Kenny

Right, I have 4x 12v 50ah battery's and 2x 12v 26ah battery's , would this suffice?

I may be able to get hold of some more, and what motor voltage would you recommend?

Thanks again

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That's only going to get you 72 volts, and you are limited to the capacity of the 26ah batteries. Charging would be really awkward, too. You will need to match the capacity of your batteries. Those batteries would store about 3kwh, and you can only use a fraction of that as they are lead acid batteries.

You may want to reconsider your battery choice. 72v could potentially be the bare minimum, but most systems run at least twice that. It will not get you to your performance goal, especially when you factor in the weight of the batteries.

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[jbman]

Re: An Intuitive Approach to Fissiks and Mechanics

15 newtons is the weight of 1.5 kg. That's far more familiar than "5 lb" for most people in the world outside of the U.S. Neither system is inherently easier; for each person, one system is more familiar.


Probably not many, unless they work on heavy equipment. On the other hand, doesn't everyone have a breaker bar about a metre long? I do.

This conversation is probably better had elsewhere, as it's not very strongly related to finding a good motor.

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[jbman]

So If I have 8x 12v 50ah , what would that give me?

Also What motor would be best suited to the battery capacity I have?

And would it help me achieve my 1400kg car goal of 70mph?

With a range of 30miles?

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To find the capacity of your battery pack, multiply the voltage by the amp hours. In your case, those batteries in series would get you to 96 volts. Multiply that by 50 amp hours and you get 4800 watt hours, or 4.8 kilowatt hours. Assuming a moderate 350 watt hours per mile, considering your car is a little on the heavy side and you're adding a lot of lead on top of that, in an ideal scenario and draining your batteries completely (to 0, which would be very bad for them), you would only get 13.7 miles. I dont know if you'd make it to 70, but if you did you wouldn't be there long.

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[jbman]

Re: An Intuitive Approach to Fissiks and Mechanics

Apologies, I was trying to work out my battery capacity to choose the correct voltage DC motor for my requirements. I hope this is Ok

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I meant the discussion over which units to use.

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