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Ya that's what I was thinking. Just seems crazy that my little tractor would require the same size motor as a road going car.
I don't know if it requires it. You probably would get away with slight downrating, but how much does a "road going car" take ? I googled just now a Toyota Corolla - 139 to 169 HP, so over 10 times more than what you're looking at.
 

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Here is the name plate from my forklift motor (still on the forklift :D) :
Font Wood Gas Number Metal


It doesn't say what amperage it's rated for, but the system is fused at 400A, so I imagine at least 300A is expected. It is currently on a 36V battery, so 11kW or so. Then from that you can calculate the power if you were to bump up the voltage in a conversion like people do...

Forklift is 5800lb with 4000lb lift capacity.
 

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Discussion Starter · #30 ·
Ya I understand what you mean. I see how the big motors can apply some real power. I'd like to find a 7" or so that can handle 200 amps. Then I'd be looking at almost 10kw peak which would be more than enough for me. I just wish it wasn't so difficult to find the specs on these things.
Is yours for a car build?
 

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Are you not concerned about the fact that it is rated for intermittent duty?
I was showing you that motor just for the scale reference. Series wound motors just happen to be big and heavy while delivering little power compared to PM motors whether AC or DC. This specific motor I replaced with AC-23 in that machine, I don't have any upcoming projects for it.
 

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Discussion Starter · #37 ·
I was showing you that motor just for the scale reference. Series wound motors just happen to be big and heavy while delivering little power compared to PM motors whether AC or DC. This specific motor I replaced with AC-23 in that machine, I don't have any upcoming projects for it.
Did you replace it because it was unreliable or not working well?
 

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Machine kept burning the controller, and I wasn't sure if there was an issue with the motor or my style of use was just outside of its capabilities. So I after I replaced the controller twice, I decided to decouple the drive into a separate system with a much more powerful motor. So original system had two motors - one drive motor, shown above, and another for hydraulic pump, while a single controller flipped between the two using contactors. Now the original controller only handles the pump motor, while the drive is on independent motor and controller.
 

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Discussion Starter · #40 ·
I don't understand why you need so much power to tow a roller. Is it round or rectangular? Towing at 30MPH?

More than 4 or 5 kW on a reduction chain/belt will just spin the tires.
I don't know either. I'm just going by the fact that the original engine was 12hp to 18hp depending on the model. That would be somewhere around 9 to 13kw. I know that electric motors provide more low end torque but I don't know how much different it would be.
 
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