6.5" hub motor advice

[Cuprani]

I currently have an e-scooter with a 36V 500W hub engine.
It's a 6,5" hub with 11" tyre (90/65 - 6.5).

I still have a good 48V Li-ion on the shelf and I want to upgrade the e-scooter.
I'm not aiming for top speed but I want lots of torque to be able to climb steep hills.

I'm very satisfied with my Kelly K7230S controller for my ebike, so I bought an K4812S for my escooter.
Capable of 120A max output and 50A continues output.

Now I'm looking for a new engine but it is hard to find a good engine with at least an 2000 Watts of power.
So far I found a few options:

1 - An 48V 1500watt engine
https://nl.aliexpress.com/item/4000151067510.html
I'm a little afraid this engine will going to be to less powerful and I don't know what it will do when putting a 40A through it. But I think it is the most safe option. Downside is that it doesn't have hall or temperature sensors.

2 - An 60V 3000watt engine
https://nl.aliexpress.com/item/4000275603402.html
I don't know if this will run good on 48V and how much power it will have on 48V
But the build quality looks very poor. The reviews aren't great as well.
If this gives a little more bang for my bug I would be willing to try.

3 - Use the original 36V 500watt engine and recoil it or just use it till it gets fried..

I have build 2 EV's before, but they where pretty plug and play, so some advice is really welcome.

 

[Balmorhea]

Keep in mind that between 20% and 40% of the electrical energy you put into your hub must be rejected as heat (depending on how well you match your load to the motor’s speed). It’s a lot to ask of such a small motor much of whose surface area is insulated by a tire. If I were you, I’d be looking at maximizing torque output while limiting power to more modest levels. Go for high efficiency and low kV.

 

[thepronghorn]

I'd say just use your original motor until it fries. Maybe try statorade to help cool it down between climbs. If you can open the motor up and install a temp sensor, that would also help you roll back the power if it starts overheating.

 

[flat tire]

QS motor. They have reasonably priced scooter hubs that will have you smoking tire and pulling wheelies.

 

[Cuprani]

Could you give one example? Because I didn't find any on the QS Motor website. But maybe I'm looking wrong.

 

[Cuprani]

Keep in mind that between 20% and 40% of the electrical energy you put into your hub must be rejected as heat (depending on how well you match your load to the motor’s speed). It’s a lot to ask of such a small motor much of whose surface area is insulated by a tire. If I were you, I’d be looking at maximizing torque output while limiting power to more modest levels. Go for high efficiency and low kV.

My EV Longboard motor is 10 times smaller and lighter produces 3000 watts of power on 48V. So I really don't understand why a much bigger engine couldn't at least produce the same amount of power.

Do you know where I could look for such motors with high efficiency? On QS I only found engines powerful enough from 10inch and up.

 

[Cuprani]

I've just dismantled the 36V engine from my e-scooter.
Some wires are burned, they have been short circuit because of wire damage, so I wanted to replace those wires anyhow before using it again.

Here the escooter and engine.
From an expert opinion, is it worth the effort to upgrade this motor?
If so, what can I do to upgrade it?

 

[Cuprani]

I went for the Kelly KLS4812S controller with a 60V 3000W motor.
https://nl.aliexpress.com/item/4000053516085.html

No regrets there.
Runs really smooth and with lots of torque on my 48v li-ion battery pack.

Topspeed of about 60km/h but that was with limitations in the controller.
I won't ever go that fast though. If I need to go fast I will take my ebike.
Most important is that it can go uphill with ease.
Really happy with this choise.

I will make a build threat later when I'm done with the build.

 

[Balmorhea]

Keep in mind that between 20% and 40% of the electrical energy you put into your hub must be rejected as heat (depending on how well you match your load to the motor’s speed). It’s a lot to ask of such a small motor much of whose surface area is insulated by a tire.

My EV Longboard motor is 10 times smaller and lighter produces 3000 watts of power on 48V. So I really don't understand why a much bigger engine couldn't at least produce the same amount of power.

Well it can, but only for a short while. The relatively high speed, exposed model airplane motor in your longboard has better efficiency (due to speed and gear reduction) and better heat rejection (due to airflow and surface exposure). If course, once you violate its limitations, it will burn up that much faster because of its small size.

Look at it this way: your hub motor is smaller than a typical 500W e-bike motor. 3000W e-bike motors are several times the size and weight. It isn't accidental, and no amount of wishful thinking will change the engineering principles involved.

Because you are working with a tiny wheel diameter, you can get more power out of the motor, compared to a bicycle motor, because of increased rpm. But you can't make it reject more waste heat than its thermal conductivity and exposed surface area allows.

 

[Badger1666]

Does anyone know if statorade will even work 6.5" motors wondering if the rpm isn't to high for it to work?