Do you plane to create an more strong reducer for the 80100 ? can this reducer pass the 80100 torque ? What is the ratio ? How does it cost to you ? do you have machinery for mcahining ?
Lower motor RPM is always easier but it cuts the power handling a lot. Just keep that in mind. You can't cheat the physics. The miracle power of these tiny motors is from the rpm. At any given time the load on the motor is low because there are so many RPM to share that load for a given power. If you slow them down then the load and the current go up really fast and you have a nice melted motor on your hands. The RPM is why 3kw hubs weigh 10kg and 3kw rc motors are only 2kg.ScooterMan101 wrote: ↑Feb 23, 2018 12:40 pm
I am thinking about a block of Delrin that is machined on the inside to match the frame and with grooved outer in order for the hose clamp to wrap as far around the downtube/delrin as much as possible . Think there is a cheaper solution ?
DanGT86 is making a case for using 2 stage reduction , However I think it would be best to buy a motor with a lower KV in the first place this would make your life/design easier I would think.
Hey dan, you mean that when loaded, I have to consider 15% of losses between loaded/not loaded ?
Very interesting Ecyclist.Ecyclist wrote: ↑Feb 21, 2018 6:57 pmMy reducer is already strong enough for 80mm motor, but I'm planning on a couple changes to make it better. At this point the ratio is 19:1. I machined it all excluding bearings and pins. I built other one that is 16:1.
You can visit my thread for details.
Yes, my reducer is based on the same principle, but is much better.
My reducer at no load is using about 100 W of power.
Tangent is using $700 Astro Flight ,very efficient motor, and is using at no load about 350 W.
This is a clear sign that something is wrong with Tangent. Can you guess what?
Obviously, you have technical skills and you should have no problems with building high quality and compact belt reducer.
The most important part for you will be to make it structurally rigid and running true.
I reworked GNG belt drive kit and have it still running strong on my wife's e-bike.
I'm looking forward to seeing your build developing.
ok for 70 rpm, but how fast ? 50km/h ?ScooterMan101 wrote: ↑Feb 27, 2018 10:41 amMatt_92
Professional Bike Racers ride with a crankset Cadence RPM of 80 or more, they have to keep the Latic Acid from building up in their legs, and when going up hills they need to have 80 or more RPM Cadence to keep their speed up.
How long can you do that ? and/or is it comfortable to ride at those Crank RPM's for your legs and Hips ?
With a motor that helps you legs , by quite a large amount , 65-70 RPM is what I find is more reasonable on the body.
On my non motorized bicycle an average cadence of just under 70 rpm is about perfect .