Xnova 8kw rc middrive first test
- Thread starter bionicon
- Start date
SlowCo
1 MW
Creative reduction on the rear swing arm. I like it.
But wouldn't it be better for the belt in the first reduction stage to have a straight line from the motor drive on top to the first pulley? And have the tightening done with a larger diameter bearing on the under side?
But wouldn't it be better for the belt in the first reduction stage to have a straight line from the motor drive on top to the first pulley? And have the tightening done with a larger diameter bearing on the under side?
I agree on the roller that tensions the belt and increases the small primary drive sprocket wrap, recommend to put it on the bottom belt run (you'll thank us later). Good job on adapting the Strida BB pulley, Miles did that too...
https://www.electricbike.com/miles-emoulton/
http://www.xnovamotors.com/
https://www.electricbike.com/miles-emoulton/
http://www.xnovamotors.com/
Ok thx i wil try to relocate the belttensioner . I also have to reinforce the strida pulley, yesterday i did make a testdrive its very short on the trottle and will wheeli instantly.
Cannot test topspeed yet........first i have to put on brakes
Cannot test topspeed yet........first i have to put on brakes
Hey Miles , didnt know that Xnova had a pre-history as xera, mayby they fashion-up the motors and sell them more expensive :?
I am using the tareq 50, 8000watts nom and 13000watts for 5 seconds. I wonder do You use a stridabelt on youre bike?
I am using the tareq 50, 8000watts nom and 13000watts for 5 seconds. I wonder do You use a stridabelt on youre bike?
X-Era were about as good as it gets but only had the 40XX series. They were never cheap!bionicon said:
I use a Gates Powergrip GT3 belt. You need to calculate the torque at each stage to check that the belts can handle it. What is the maximum phase amps you're using? What is the reduction ratio on the first stage (from the motor)?
You want to avoid tension idlers altogether, if possible....
I made my calculation on the rc drivetraincalculator (recumpent site) its geared for 80km/U . I think the no load is over the 100km/U.
The pulley on the motor is 14 t to a 72t pulley. On the second red. its a pulley of 18t to the strida of 100t.
The second reduction belt is a gates powergrip HTD of 13mm width.
The pulley on the motor is 14 t to a 72t pulley. On the second red. its a pulley of 18t to the strida of 100t.
The second reduction belt is a gates powergrip HTD of 13mm width.
So its maybe better to switch to chain drive for the second reduction. I was thinking that I could addapt the beltdrive of the zero motorcycle but its to expensive.
Also switch from the rightside to the leftsidedrive, makes it more easy (not for addapting a discbrake). I also noticed that i have to reinforce with thicker aluminium to make it more rigid.
Also switch from the rightside to the leftsidedrive, makes it more easy (not for addapting a discbrake). I also noticed that i have to reinforce with thicker aluminium to make it more rigid.
Check for flex in your gearbox/swingarm
I did something remotly similar.
By pinching the belt I can see were things flex.
I can pass 5000W input without skipping but my belt reduction flex quite a bit and it's near skipping.
I will make it more stiff. Stiff is you friend for belts. They pull quite a lot.
For belt tension, aluminium shrink enough to pose problems with temperature for the long belt, short one it's ok.
I had this problem with aluminium boom model helicopters and my electric bike also. (from 22C -> 3C it's enough to be concerned)
Spring loaded idler did solve the problem on the helicopter.
You can also use a carbon drive belt. they are way better that htd.
Strida pulley is ok with carbon drive but I dont know about your small one. you need to use proper thoot profile.
I did something remotly similar.
By pinching the belt I can see were things flex.
I can pass 5000W input without skipping but my belt reduction flex quite a bit and it's near skipping.
I will make it more stiff. Stiff is you friend for belts. They pull quite a lot.
For belt tension, aluminium shrink enough to pose problems with temperature for the long belt, short one it's ok.
I had this problem with aluminium boom model helicopters and my electric bike also. (from 22C -> 3C it's enough to be concerned)
Spring loaded idler did solve the problem on the helicopter.
You can also use a carbon drive belt. they are way better that htd.
Strida pulley is ok with carbon drive but I dont know about your small one. you need to use proper thoot profile.
Just as an FYI, I have nothing to do with Xnova motors and I can't say anything about their quality. The design from the outside looks exactly the same as the motors I designed. I stopped selling motors some time ago when I started working on camera gimbals and other flying things at www.freeflysystems.com
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