Stevebequik
100 mW
- Joined
- Mar 18, 2019
- Messages
- 36
QS 3000w midmotor
- Thread starter bionicon
- Start date
j bjork
100 kW
Thanks 
What sprockets are you using?
What sprockets are you using?
trazor
100 W
- Joined
- Jan 13, 2015
- Messages
- 171
Stevebequik said:
Awesome idea to use the swingarm bolt to mount this motor. When I saw this motor version I was wondering how to mount it and your solution is great. What is the current weight of the e-moto? How many KW/h of batteries can you fit in? What chain size are you using? Where did you source the big rear sprocket? Thanks for sharing your build! Maybe you can start your own build thread?
larsb
1 MW
This build is pretty similar if you’re looking for inspiration:
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=94666&sid=f41c7444d28d19993056cb54757de448
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=94666&sid=f41c7444d28d19993056cb54757de448
Stevebequik
100 mW
- Joined
- Mar 18, 2019
- Messages
- 36
New type motor worked out well, very pleased.
Sprockets came from eBay, 10t front, 60 t rear, rhk 520 x ring.
Just search 20mm front sprocket, 520 blank talon sprocket,(came from uk)
Below 12t front, the m6 retainer doesn’t clear the chain. The circlip method needs a spacer machined up to fit behind. So far so good, but want to get some spare and heavy duty circlips.
I purchased a complete gen 1 Chevy volt battery a couple of years ago for my off grid setup. Stole 3kwh from that for the bike. So this is 18s 45ah.
On a slow boat from the states, I have a gen 2 complete pack coming.
I’m hoping to install 21s in the same space, at 55ah will be 4kwh.
Using bath scales, bike is currently 114kg.
Sprockets came from eBay, 10t front, 60 t rear, rhk 520 x ring.
Just search 20mm front sprocket, 520 blank talon sprocket,(came from uk)
Below 12t front, the m6 retainer doesn’t clear the chain. The circlip method needs a spacer machined up to fit behind. So far so good, but want to get some spare and heavy duty circlips.
I purchased a complete gen 1 Chevy volt battery a couple of years ago for my off grid setup. Stole 3kwh from that for the bike. So this is 18s 45ah.
On a slow boat from the states, I have a gen 2 complete pack coming.
I’m hoping to install 21s in the same space, at 55ah will be 4kwh.
Using bath scales, bike is currently 114kg.
j bjork
100 kW
Thanks, I found them. It seems like the best option, I have not found very much big 428 sprockets. I was thinking about 72t 428 and about 12t front, maybe that would be better.
minde28383
10 kW
- Joined
- Apr 2, 2010
- Messages
- 700
72T and 12T will give 6 ratio.
72T and 10T will give 7.2 ratio.
If it is too sluggish from start, change it to 10T later on. It all depends on rear wheel diameter and tire selection and amps supply.
Or in between with 65T and 10T - 6.5 ratio, but with 72T more freedom to change gearing later on.
These 72T sprockets look so big.
72T and 10T will give 7.2 ratio.
If it is too sluggish from start, change it to 10T later on. It all depends on rear wheel diameter and tire selection and amps supply.
Or in between with 65T and 10T - 6.5 ratio, but with 72T more freedom to change gearing later on.
These 72T sprockets look so big.
j bjork
100 kW
10 front and 60 rear will be the same as 12 front and 72 rear. (6-1) Front sprockets are avalible from 10t to maybe 20t, both 428 and 520 I think. Rear is harder.
If I go 520, 10t front and 60 rear I can only go higher. If I go 428, 12t front and 72 rear I can go both higher and lower. From the info I found on this forum more tooth means less noice, it was especially bad to go under 11t.
A 520 chain has longer between rollers, so a 60t 520 will be bigger than 60t 528. I don´t know how much, my thougt was a 72t 428 might be simular in size. It should probably not be very difficult to calculate I suppose.
If I go 520, 10t front and 60 rear I can only go higher. If I go 428, 12t front and 72 rear I can go both higher and lower. From the info I found on this forum more tooth means less noice, it was especially bad to go under 11t.
A 520 chain has longer between rollers, so a 60t 520 will be bigger than 60t 528. I don´t know how much, my thougt was a 72t 428 might be simular in size. It should probably not be very difficult to calculate I suppose.
minde28383
10 kW
- Joined
- Apr 2, 2010
- Messages
- 700
different pitches, different lengths, see pic.
more tooth does not mean less noise. Unless you install bigger front sprocket and motor rpm drops down, so yes, there will be less noise but mostly because lower rpm, but less mechanical advantage which is opposite what is aimed.
Noise is created by chain bouncing (hitting) front sprocket teeth and bouncing overall.
Proper chain tension, chain length also makes noise difference that is why I prefer motor to be in rear fork.
lower rpm = less noise
that is why low rpm hubs motor used as mid drive is so quiet.
if want lower noise with high rpm motor, than will need much bigger than 12T front sprocket to make some noise reduction. But to keep the same ratio will need to increase rear sprocket too which is already not small diameter.
10T is bad not because it makes more noise, probably it makes no difference compared with 12T, but because less teeth catches chain, more load on sprocket on chain itself - less surfaces is at work so to say.
Check rubberized front sprockets or diy if after less noise. see pic. Which again is a problem on small front sprockets because rubber pads needs space to be installed on.
All above mentioned I will use any 10T or 12T 428 sprocket. The one which is compatible with the motors axle which is 20mm, see pic.
more tooth does not mean less noise. Unless you install bigger front sprocket and motor rpm drops down, so yes, there will be less noise but mostly because lower rpm, but less mechanical advantage which is opposite what is aimed.
Noise is created by chain bouncing (hitting) front sprocket teeth and bouncing overall.
Proper chain tension, chain length also makes noise difference that is why I prefer motor to be in rear fork.
lower rpm = less noise
that is why low rpm hubs motor used as mid drive is so quiet.
if want lower noise with high rpm motor, than will need much bigger than 12T front sprocket to make some noise reduction. But to keep the same ratio will need to increase rear sprocket too which is already not small diameter.
10T is bad not because it makes more noise, probably it makes no difference compared with 12T, but because less teeth catches chain, more load on sprocket on chain itself - less surfaces is at work so to say.
Check rubberized front sprockets or diy if after less noise. see pic. Which again is a problem on small front sprockets because rubber pads needs space to be installed on.
All above mentioned I will use any 10T or 12T 428 sprocket. The one which is compatible with the motors axle which is 20mm, see pic.
j bjork
100 kW
Thanks, interesting discussion.
It starts to get a little off topic maybe.
I just started a thread about my build, tips on what sprockets and parts to use etc. would be welcome there:
https://endless-sphere.com/forums/viewtopic.php?f=12&t=103800
It starts to get a little off topic maybe.
I just started a thread about my build, tips on what sprockets and parts to use etc. would be welcome there:
https://endless-sphere.com/forums/viewtopic.php?f=12&t=103800
The 22T pinion is original. Qs motor doesn't sell any other gear size and it's a shame. I would have liked to order a 48T pinion because my transmission is reversed because I use a reduction bridge and 2 reduction stages. Between the engine and the primary there is no reduction (1: 1) so to relieve the shafts of the engine and the reduction bridge, I want to use larger sprockets.
So I ordered a standard 8M 48T pinion and I have to machine the center myself to adapt it to the axis of the motor which is conical with a Woodruff key.
So I ordered a standard 8M 48T pinion and I have to machine the center myself to adapt it to the axis of the motor which is conical with a Woodruff key.
In France I order from :
www.123courroies.com
I found a very practical site with a free transmission calculator at :
https://www.ero-joint.com/
https://www.ero-joint.com/en/calculation-transmission-belt
There is also a software to size the transmission.
"Contitech suite" download here :
https://contitech-suite.software.informer.com/7.4/
www.123courroies.com
I found a very practical site with a free transmission calculator at :
https://www.ero-joint.com/
https://www.ero-joint.com/en/calculation-transmission-belt
There is also a software to size the transmission.
"Contitech suite" download here :
https://contitech-suite.software.informer.com/7.4/
macribs
10 MW
- Joined
- Jul 22, 2014
- Messages
- 3,702
QSMOTOR said:
When will this motor become available? It seems there have been nothing but picture of this motor on your website for the past 6 months. Still no specs, no motor data, no graphs. I hope you can update us with more information on this new motor.
eee291
100 kW
macribs said:
I'd love it if they started selling some early prototypes even without warranty.
I really want to convert a small car with this motor.
QS is apparently only advertising their new 180 90H motor on this forum. Who knows why. They apparently also have a 180 135H good for 12kW continuous, but no details.
QSMOTOR said:
QSMOTOR said:
macribs
10 MW
- Joined
- Jul 22, 2014
- Messages
- 3,702
SRFirefox said:
I think the 180 motor first showed up on their own website early last summer. But no data, time frame for production and sale, or even price. I am so far behind on this forum I didn't even know they posted all that info on the forum. Thx for sharing. Much obliged. Great link.
Maybe QS motor get worthy feedback from forum users and customers here, so that release news here first? To monitor what people think and mean about a new motor? I know QS goes a long way to meet orders from ES members in regards to custom orders. Like different axles, allow for sprockets, etc.
larsb
1 MW
2.2kw noload?
It’s at 12.5A / 72V on my motor, don’t know exact voltage when i tried it.
kv60 without flux
kV 75 or thereabouts with flux weakening, i reach about 6000rpm on 20s lipo
It’s at 12.5A / 72V on my motor, don’t know exact voltage when i tried it.
kv60 without flux
kV 75 or thereabouts with flux weakening, i reach about 6000rpm on 20s lipo
Thanks @pitmix!
Is the first spin up in the video without flux weakening, and second, third and fourth with flux weakening at different flus weakening levels?
If yes, than those numbers match up with yours @ larsb, when you include belt and wheel losses
And would mean no load losses of around 300W @40V (or only around 160W @30V), which is fine for what I want to do with it, yay!
Is the first spin up in the video without flux weakening, and second, third and fourth with flux weakening at different flus weakening levels?
If yes, than those numbers match up with yours @ larsb, when you include belt and wheel losses
And would mean no load losses of around 300W @40V (or only around 160W @30V), which is fine for what I want to do with it, yay!
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