Most powerful hub motor below 5lbs

[Cephalotus]

I do own a direct drive hub motor (VIVANA LE250RH, Nanfong Leisheng Special Motors Co Ltd. ) that runs at 300rpm @ 36V and weights 3.06kg incl. mount for a cassette and option to mount disc brakes. 36 spoke holes though, which sadly excludes most lightweight rims.

Sadly my motor has an axle grinded down to 8mm instead of 10mm, so I have not been able to try it yet.

I doubt that it would be wise to ride it at 2500W+. The cogging is rather low, so I assume that maximum torque will be quite low, too.

I assume(!) that geared hub drive systems in that weight class deliver a lot more torque, but I doubt that they will tolerate 2500W+ either.

 

[Toorbough ULL-Zeveigh]

https://endless-sphere.com/forums/search.php?keywords=swytch

Does it recharge as you pedal?
Our system doesn’t offer regenerative braking, because for cycling it’s pointless. 80% of the energy is used to push air out the way, so by adding regen braking the increased range would be minimal.

Instead we use a geared brushless motor that has zero drag so that you can still ride your bike like a regular bike even with the power pack off. If we added regen braking then the motor would always be dragging against your pedalling even with the power off.

Is there any drag?
We use a silent, smooth and frictionless geared brushless motor. So with the power pack removed you can still cycle like normal.

How much does it weigh?
The motor weighs 1.5kg, and the power pack weighs 1.5kg, so the added weight is just 3kg!

https://www.indiegogo.com/projects/...it?_fs=9c71f28c-23a0-43d8-945a-f1bcd0c12755#/

thank LockH(eed) for posting too much
you would have known about this motor sooner (immediately actually) had he not been banned.
for posting too much.

 

[Ecyclist]

You want a sub 2.25kg hub motor that is capable of 45a continuous? Id like one also :thumb:

Yep. It's pretty clear from the replies I was dreaming.

Xiongda 2 Speed hubmotor is all you will need for an easy going bike riding.
I put one into my son's trike. It does the job in San Diego. I enjoy riding it myself.
It will be a good starting project for you.
Have fun.
https://endless-sphere.com/forums/viewtopic.php?f=3&t=58490

 

[Zorroavelo]

I wonder if this motor is real or fake: € 491,33 7%de réduction | 72 V 3000 W vélo électrique eBike Kits de Conversion moteur Para Bicicleta 20 "24" 26 "28" roue arrière/avant
https://s.click.aliexpress.com/e/_BPgvdo

2,4kg 3000watts???

 

[Balmorhea]

I wonder if this motor is real or fake: € 491,33 7%de réduction | 72 V 3000 W vélo électrique eBike Kits de Conversion moteur Para Bicicleta 20 "24" 26 "28" roue arrière/avant
https://s.click.aliexpress.com/e/_BPgvdo

2,4kg 3000watts???

My dad would call it "una trampa pa' coger misiules".

 

[Bullfrog]

I'm considering a few new builds. One of them is a 20" wheel hub motor build. The top speed should be somewhere between 28 and 32mph, with lots of torque. I'd be using an aftermarket controller, most likely one of the ASI BAC's. And I'd likely use a high-C 21700 battery pack capable of 45amps continuous, with at least 48v, more than likely 52v if the motor can handle it. So I should be able to squeeze every last bit of performance out of any motor I use. The problem is that I also need the motor itself to be less than 5lbs. What's the best option out there? Is there a hub motor that can give me that kind of performance at such a light weight? I've been searching the forums here and have yet to find an answer to this question. But if it's already been answered here, please drop me some links. Thanks y'all!

For your application, a MAC or GMAC would be the best choice. It will provide higher acceleration per amp than any Direct Drive motor and be lighter than a Direct Drive motor. Use the Grin Tech Motor Simulator to see which winding works for your overall wheel diameter but I am guessing an 8T.

It will easily handle the amperage and voltage you are talking about using.

 

[john61ct]

My dad would call it "una trampa pa' coger misiules".

as in missiles?

Misiulės is the closest I got but it's Lithuanian

 

[Chalo]

My dad would call it "una trampa pa' coger misiules".

as in missiles?

Misiulės is the closest I got but it's Lithuanian

He means chumps you might address as monsieur before you take them for a ride. You can't really pronounce that in Spanish, so it gets an approximation.

 

[Zorroavelo]

Yes i'm pretty sure it was a scam. The seller just mixed differents motors specifications. He never answers to questions like: "Can you tell me the exact model of this motor?" Or: "Is it really 2.4kg dd motor for 3000w??" He just don't answer and tell you to buy... F..king Chi.eese scammer.

 

[Zorroavelo]

I also need high power, in my case for pushing heavy loads up long steep hills.

Setting weight-to-power ratio aside for now.

They say DD hub motors are not suitable since they don't develop enough power until they've reached a certain speed.

Internally geared hub motors are bad at dissipating the heat, and either noisy ot prone to stripping the nylon gears.

Hub motors just don't have enough power, full stop.

So my conclusion is, multiple motors are required for my use case.

Maybe the hub motor, geared way down to assist most with standing starts (human legs too AMAP).

DD hub(s) for helping get the heavy load up the hills, after the rig is rolling at a minimum speed.

Considering using a tandem as my base, so could maybe get multiple hub motors working together.

So, maybe this line of thinking is helpful for your use case?

Have you look about the Keyde hub motors? Some have integrated controller and are very compact. It will not be incredibly powerfull but dd and light

 

[john61ct]

Not cheap, not great service response, unreliable QA problems

Apparently, from past threads

 

[pullin-gs]

I'm getting 30MPH max....cruise 25MPH with this motor.
Weighs 6lb.
Rated 800W at 36V.
I run it on a trike with 20 inch wheels. Trike weighs 49lbs total.
Overvolt it with a 12S (44V) pack.
Been running the 228RPM version now for over 4000 miles. Wife's motor over 1000 miles.
https://bmsbattery.com/motor/1130-18552-q128c-135mm-36v800w-cst-rear-driving-ebike-hub-motor.html#/213-rpm-201
Here is the build
https://www.endless-sphere.com/forums/viewtopic.php?t=98760