tractor conversion

[pirpy]

Hello
I want to convert small tractor to EV

IMT-542.jpg (460 KiB) Viewed 491 times

I have 16 x lifepo4 200 Ah for the project.
I want the conversion to be as cheap as possible, so Im looking to rewind industrial 4 pole 400 V AC motor 7.5 kWh to 22V .
original diesel engine in this tractor is 31 kW peak at 2250 rpm and 149 nM torque at 1400 rpm.
what peak torque can I expect from this motor?
As I understand I need to add an encoder to the motor, where can i get one that would work with let's say Kelly KAC-8080I

or would 10kW bldc be a better option ?

Thank you

[jonescg]

What kind of work will it be doing? Will it be doing any serious cultivation or mainly towing things? Because the motor need not be too amazing. A re-wound industrial AC motor would certainly fit the cheap requirements, but it might need some kind of cooling added.

4 pole is ideal for most applications, and any VFD will make it spin, you just need to find a reasonably efficient one.

[antiscab]

An encoder is only needed it you want fine torque control. On a tractor you could probably get away with either speed control only, or course torque control that running open loop without an encoder would offer

[Richo]

...rewind industrial 4 pole 400 V AC motor 7.5 kWh to 22V .

Although the specifications match your tractor I'm skeptical that someone would rewind it to 22Vac.
When you think about 400Vac/22Vac this is 18:1.
I'd think this would mean you'd only have 3 or 4 conductors per slot.
Or many in parallel.

This would add perhaps AUD$1,000 to the cost of the conversion.

[Richo]

Possible alternatives are a series DC motor:
A00-4009
203-06-4001
ME1002

[Richo]

Possible alternatives for Magnet motor:
ME1302
ME1616
ME1507

[pirpy]

An encoder is only needed it you want fine torque control. On a tractor you could probably get away with either speed control only, or course torque control that running open loop without an encoder would offer

thank you !


It will be doing light work, for heavy work I have this one
[tube]https://youtu.be/e2CAHfJqlFM[/tube]

The speed controll would be the best for tractor as it is the case with diesel engine.

The rewinding will not be the problem I would use the same wire but meny of them in paralel, the problem I'm expecting is with 3 or 4 wounds per coil I will not be able to make the motor 22 V but hope close to that .
I could lift the battery voltage but I'm planning to simply put my power wall 48 V lifepo4 cells to tractor and then use it for both aplications
Local rewind shop would charge me 300 € for rewinding 7.5 kW motor to lower woltage , and I already have a suitable motor in my junk bin :

7.5kW 4 pole 400 V

7.5kw.jpg (907.15 KiB) Viewed 458 times

I also have a DC motor in my junk bin:

72 V 80 A series DC motor

6 kW DC.jpg (662.12 KiB) Viewed 458 times

I gues I could rewind the stator coils to lower voltage but this one does not have shaft that would allow me to mount a flywheel, ....

Comments appreciated

[Richo]

As I understand I need to add an encoder to the motor, where can i get one that would work with let's say Kelly KAC-8080I

An encoder is only needed it you want fine torque control.

The Kelly controllers do seem to be the cheapest option for an Induction motor.
KAC72601-8080I USD$700
KAC72701-8080I USD$800

They require a "Dual channel A/B encoder" to work.
I'm assuming they mean a quadrature encoder.

[Richo]

Please don't buy this it's only an example
https://www.aliexpress.com/item/893080068.html

[Richo]

A curtis controller might work too:
1234SE-452X
1234SE-562X
But I expect they'll be harder to get and cost more.

[pirpy]

So kelly or slider will not work without encoder ?
in speed mode?
slider:
https://www.alibaba.com/product-detail/ ... 3e5fw0fNC3

[antiscab]

likely the best answer is we won't know until someone tries it.
There may be a setting to run straight v/hz

It would be worth contacting kelly controls and asking

[Richo]

I did scan over the kelly manual yesterday and I was under the assumption it is required.
Someone must have already done it - its a case of finding it.
When I have more time...