Re: [EVDL] hub motor for 20" wheels

[Chris Tromley via EV]

Just realized you're looking for a 36V solution and the Currie setup is for
24V.  Go to http://evdeals.com/Currie%20Kit.htm and see their similar kit
and options.  Theirs is 24V too, but call Scott at 508-695-3717.  I'm
guessing some of his motor options could be run at 36V just fine, and
you'll need to overspeed it anyway to get that tiny 20" rear wheel up to
20-25 mph.  It's a good bet that Scott will know if that's feasible.

The main advantages with this approach are that you keep your original
wheel and there's less weight added to it.  Not a small concern for a bike
with a suspended rear wheel.  Understand if you do this it will ride
harsher just because of the added weight on the wheel.

Chris

On Sun, Aug 14, 2016 at 8:13 AM, Chris Tromley  wrote:

> A Currie E Drive (or similar) setup might work.
>
> http://www.electricscooterparts.com/currieelectrodriveelectricbicy
> clekitparts.html
>
> Chris
>
> On Sat, Aug 13, 2016 at 5:29 PM, ken via EV  wrote:
>
>>   I have a Bike E with 20" back wheel . Where can I find a reasonably
>> priced wheel thats desgined to be effeient for  that RPM / 20- 25 mph
>> and 36 volts.
>>
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Re: [EVDL] hub motor for 20" wheels

[Chris Tromley via EV]

A Currie E Drive (or similar) setup might work.

http://www.electricscooterparts.com/currieelectrodriveelectricbicyclekitparts.html

Chris

On Sat, Aug 13, 2016 at 5:29 PM, ken via EV  wrote:

>   I have a Bike E with 20" back wheel . Where can I find a reasonably
> priced wheel thats desgined to be effeient for  that RPM / 20- 25 mph
> and 36 volts.
>
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Re: [EVDL] hub motor for 20" wheels

[Michael Ross via EV]

I have one (BikeE) laced radial on the non-drive side and it is fine. I was
misremembering that it was radial on both sides. The drive side on both my
BikeEs are 1 cross pattern and the one without radial lacing is 1 cross on
both sides.  It may be necessary to use a drill to angle the rim holes
better to avoid bending the spokes and stressing the nipples (which break
under much side loading).

The hub motor I am familiar with is a MAC (handy because of internal
gearing) and it is a large diameter hub.  there are probably smaller, lower
torque producing motors.  It is torque you are after in the long run. You
want to get some help starting up on inclines.

I was looking at putting a Schmidt hub inside a front 16 inch wheel, but I
chickened out. Lacing might be very tough.

On Sun, Aug 14, 2016 at 12:50 AM, Lee Hart via EV  wrote:

> ken via EV wrote:
> >> I have a Bike E with 20" back wheel. Where can I find a reasonably
> >> priced wheel that's designed to be efficent for that RPM / 20- 25 mph
> >> and 36 volts.
>
> Michael Ross via EV wrote:
>
>> Better check me, I get 335 RPM at 20mph and 419 RPM at 25 mph
>> 36 volts will get you less torque than 48 volts. Probably not a problem
>> with a light bike like a Bike E.
>>
>> It will be quite tricky to lace such a wheel up as the spokes will have to
>> be very short.  Consider radial lacing (no crossing spokes).
>>
>
> I didn't think you could use radial spokes with a powered wheel (can't
> handle the torque).
>
> Honestly, I think you would be better off rigging up a mid drive.
>>
>
> I agree. I also have a Bike-E, and have been thinking of ways to E-bike
> it. But it has a 7-speed rear hub. You'd lose that if you go to a powered
> wheel, which could make it pretty hard to ride under pedal power.
>
> I have a Giant LaFree E-bike. Its motor has a small sprocket with a
> freewheel on it, which drives the chain. The rear wheel does not have to be
> modified at all, and the motor benefits from whatever gearing you have on
> the back wheel. This setup has worked very well. The only challenge would
> be to find an appropriately sized freewheel sprocket for the motor.
>
> I also have a couple of "Warrior" E-bike friction-drive motor setups. They
> aren't as efficient, but you can lift them off the tire when not needed to
> have zero effect on efficiency. Yes, they slip when wet and can cause
> faster tire wear; but it's a mighty easy system to put together in a hurry
> for testing/evaluation.
>
> I have a conventional 26" bike with a front hub motor. It works, but I
> really don't like it. It degrades handling, and the front wheel is inclined
> to slip if you apply enough torque to be more than a gentle thrust. I think
> a front-drive setup would be even worse on a Bike-E.
>
> --
> A designer knows he has achieved perfection not when there is
> nothing left to add, but when there is nothing left to take away.
> -- Antoine de Saint Exupery
> --
> Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
>
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>
>


-- 
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison


A public-opinion poll is no substitute for thought.
*Warren Buffet*

Michael E. Ross
(919) 585-6737 Land
(919) 576-0824  Mobile and
Google Phone

michael.e.r...@gmail.com

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Re: [EVDL] hub motor for 20" wheels

[Lee Hart via EV]

ken via EV wrote:
>> I have a Bike E with 20" back wheel. Where can I find a reasonably
>> priced wheel that's designed to be efficent for that RPM / 20- 25 mph
>> and 36 volts.

Michael Ross via EV wrote:

Better check me, I get 335 RPM at 20mph and 419 RPM at 25 mph
36 volts will get you less torque than 48 volts. Probably not a problem
with a light bike like a Bike E.

It will be quite tricky to lace such a wheel up as the spokes will have to
be very short.  Consider radial lacing (no crossing spokes).


I didn't think you could use radial spokes with a powered wheel (can't 
handle the torque).



Honestly, I think you would be better off rigging up a mid drive.


I agree. I also have a Bike-E, and have been thinking of ways to E-bike 
it. But it has a 7-speed rear hub. You'd lose that if you go to a 
powered wheel, which could make it pretty hard to ride under pedal power.


I have a Giant LaFree E-bike. Its motor has a small sprocket with a 
freewheel on it, which drives the chain. The rear wheel does not have to 
be modified at all, and the motor benefits from whatever gearing you 
have on the back wheel. This setup has worked very well. The only 
challenge would be to find an appropriately sized freewheel sprocket for 
the motor.


I also have a couple of "Warrior" E-bike friction-drive motor setups. 
They aren't as efficient, but you can lift them off the tire when not 
needed to have zero effect on efficiency. Yes, they slip when wet and 
can cause faster tire wear; but it's a mighty easy system to put 
together in a hurry for testing/evaluation.


I have a conventional 26" bike with a front hub motor. It works, but I 
really don't like it. It degrades handling, and the front wheel is 
inclined to slip if you apply enough torque to be more than a gentle 
thrust. I think a front-drive setup would be even worse on a Bike-E.


--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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Re: [EVDL] hub motor for 20" wheels

[Michael Ross via EV]

C=2PiR = circumference where R=20"/2 (units of inches)
Cin miles = Cinches x (1ft/12inches) x (1 mile / 5280 ft)
25mph/circumference(in miles) =rev/hour
rev/hour x 1hour/60min = rpm

Better check me, I get 335 RPM at 20mph and 419 RPM at 25 mph

36 volts will get you less torque than 48 volts. Pprobably not a problem
with a light bike like a Bike E.

It will be quite tricky to lace such a wheel up as the spokes will have to
be very short.  Consider radial lacing (no crossing spokes).

Honestly,
I think you would be better off rigging up a mid drive.  You might be able
to mount a tandem cranks with an additional left side sprocket and run the
motor to that. Sling the motor below the center of the frame somehow. This
way to maintain the ability to shift gears in the back with both the hub
and derailer.  THis might make motor selection easier.

The small rear wheel rolls out less per rev and most motors are designed
for a larger wheel - therefore slower RPM than you want.  Also, in my
experience you will want to try to keep up pedaling with the motor - the
gearing will be handy for this. And you have a useful back up plan if the
batteries or motor cease working for some reason.









On Sat, Aug 13, 2016 at 5:29 PM, ken via EV  wrote:

>   I have a Bike E with 20" back wheel . Where can I find a reasonably
> priced wheel thats desgined to be effeient for  that RPM / 20- 25 mph
> and 36 volts.
>
> ___
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> http://lists.evdl.org/listinfo.cgi/ev-evdl.org
> Read EVAngel's EV News at http://evdl.org/evln/
> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/
> group/NEDRA)
>
>


-- 
To invent, you need a good imagination and a pile of junk.
Thomas A. Edison


A public-opinion poll is no substitute for thought.
*Warren Buffet*

Michael E. Ross
(919) 585-6737 Land
(919) 576-0824  Mobile and
Google Phone

michael.e.r...@gmail.com

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Re: [EVDL] hub motor for 20" wheels

[Willie2 via EV]

On 08/13/2016 04:29 PM, ken via EV wrote:

   I have a Bike E with 20" back wheel . Where can I find a reasonably
priced wheel thats desgined to be effeient for  that RPM / 20- 25 mph
and 36 volts.

http://www.ebay.com/sch/i.html?_nkw=20%22+ebike+conversion+kit
http://www.aliexpress.com/wholesale?SearchText=20%22+ebike+conversion+kit

Here is a 36v rear:
http://www.ebay.com/itm/36V-48V-500W-20-Threaded-Rear-Wheel-Ebike-Conversion-Kit-Sine-Wave-Controller-/331747947601?hash=item4d3db7f451:g:LRgAAOSw7FRWVXcc


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[EVDL] hub motor for 20" wheels

[ken via EV]

  I have a Bike E with 20" back wheel . Where can I find a reasonably
priced wheel thats desgined to be effeient for  that RPM / 20- 25 mph
and 36 volts.

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