Huge torque motor?

[dangie]

Hi,
I already have a cheap chinese electric bicycle with a 36V 180w hub motor.
I like it, but now I want to build my own custom built super-tourq electric bicycle! :D

Can someone recomend either some components (high power motor, battery, controller) or perhaps a kit that offers some fantastic acceleration/tourqe capabilities?
Please note that:
- high top speed-NOT important
- high tourqe from low rpm's is my main objective.
- cost is not a main concern
- (I would prefer to have a silent solution that does not emit to much mechanical noice.)

Suggestions much appreciated!
Thanks!

[Abneycat]

The best silent solution I can think of would be a Crystalyte 5305 or 5304, run at 48v or higher. Even a nicer series 4 motor like the 408 or 4011 will put out quite a bit of torque at higher voltage levels.

If you weren't worried about noise, internal gear reduction motors can offer a lot of torque, as can frame mounted motors which are able to use your bicycle's drivetrain. They will make a mechanical whirring noise, not loud like a gasoline engine, but certainly noticeable - it won't be stealth like a direct drive solution would be.

[Harbournet]

Hi there,

I know there are some companies out there producing 2000w rear hub motor kits and beyond if you want huge torque - from what i hear they are also scary to ride:D:D Should suit your needs

[kyakdiver]

I don't know where your from but this is my experience with the BMC geared hub from EV Tech.

I wanted a 12lb motor and not a 25lb 530whatever for my second build.... I also wanted something that did freewheel. I got both with the BMC. As for geared hubs and making noise... very little noise comes from them and you don't have to run 60+ volts to get good low end. Running at 48V's in a 26 wheel will give you lots of fun times. Having a bike that still feels like a bike is important to me also.... You get that with the BMC. Team hybrid sells a modified version of the BMC called the Puma that is supposed to be even better.

I also have a 408 that sits in the corner gathering dust. It's a slow boat anchor with my 48V packs of lifepo4.

My 408 does have a little higher top speed... 27mph while the BMC goes about 25. 25 is plenty fast for me on flats.. Where the geared hubs shine is when I'm heading home I have a long steep hill. My 408 will do it at about 8 without help and maybe 12 with it. My BMC will never get below 14 without help and 17 or better with help.

For the type of country I live in.... I don't have much flat places to ride and this was the best solution for me.

you mentioned low speed power and maybe you want light weight as well...

This is my experience.....

kyakdiver

[kyakdiver]

I'm also running a 36-72V 40A Crystalyte controller

[pengyou]

well...how big is "huge"? I once saw a "small" 8 horsepower motor that was mounted on the rear of a bicycle...in a chain driven situation...I am sure that had a lot of torque but was probably overkill.

[cerewa]

well...how big is "huge"? I once saw a "small" 8 horsepower motor that was mounted on the rear of a bicycle...in a chain driven situation...I am sure that had a lot of torque but was probably overkill.

If you are going for "low speed" then almost any motor of 2hp or more (and some even in the 400watt range) will be able to take you up the steepest hills any upright bicycle could possibly climb.

I think you will find that all of the crystalyte motor setups with 500W or more of power will give plenty of torque except the ones designed for high top speed.... really any 500W + hubmotor will blow your 180W machine out of the water in hillclimbing ability.