qs 1000w builds

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
devo1223   100 W

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Re: qs 1000w builds

Post by devo1223 » Jun 03 2019 6:23pm

Does this motor really have a kv of 11 or is the rpm on the graph after the belt reduction?
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flat tire   1 MW

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Re: qs 1000w builds

Post by flat tire » Jun 03 2019 6:27pm

I'm not familiar with that particular motor but 11kv would be very much in the ballpark for a hub motor.

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Skaiwerd   100 W

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Re: qs 1000w builds

Post by Skaiwerd » Jun 04 2019 6:38am

It’s not a hub motor.

Doing the math of kv x volts to get rpm is a very low number at 11kv. Should be a number in the thousands not hundreds for rpm. I’m thinking kv of a motor rating is just that and has no relation to the reduction.

I’m considering selling this motor as my projects have changed focus, again. I’m in the USA.

larsb   1 MW

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Re: qs 1000w builds

Post by larsb » Jun 04 2019 9:20am

It's after reduction, just look at the torque numbers.

devo1223   100 W

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Re: qs 1000w builds

Post by devo1223 » Jun 04 2019 11:19am

awesome, thanks larsb! So kv is around 59 assuming the 5.3:1 reduction they list for their belt drive. I'm about to purchase chains and sprockets. If I'm aiming for 40mph, should I gear my no load speed for something higher, like 60mph? I'm going to try and get 5kw from this little motor. My nuclear controller should be here at the end of the week.......
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devo1223   100 W

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Re: qs 1000w builds

Post by devo1223 » Jun 20 2019 2:29pm

It's alive!
20190619_210139 (600 x 450).jpg
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Skaiwerd   100 W

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Re: qs 1000w builds

Post by Skaiwerd » Jun 25 2019 2:45pm

Glad you got it going! And with the nuclear controller too. Did you get the 12f? I gave up my space in line to free up funds for my workshop expansion going on now. I’m hoping the controller is a success and readily available down the line.

devo1223   100 W

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Re: qs 1000w builds

Post by devo1223 » Jun 29 2019 3:32pm

yeah the 12f, almost done
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devo1223   100 W

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Re: qs 1000w builds

Post by devo1223 » Jul 31 2019 12:50pm

seems pretty happy with 8:1 reduction at 60v. I'll report more once I stop the 219 chain from constantly falling off. Currently at 3500w no problem
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Grantmac   10 kW

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Re: qs 1000w builds

Post by Grantmac » Jul 31 2019 7:10pm

8:1 total reduction to the rear wheel? 26" rim I assume?
Taken it on any really steep climbs? Max speed?

Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Jun 13 2020 1:19pm

Hi guys,

Does someone know a source to get a sprocket for a 420 chain?

The axle shaft is quiet special with its conic taperlock. Until now I did not find a supplier. Not in Europe, nor on Aliexpress. Someone got an idea?

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Compoundbike   10 W

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Re: qs 1000w builds

Post by Compoundbike » Jun 27 2020 5:35pm

Interesting project I should maybe start making something similar.

Tommm   100 kW

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Re: qs 1000w builds

Post by Tommm » Jul 26 2020 9:12am

devo1223 wrote:
Jul 31 2019 12:50pm
seems pretty happy with 8:1 reduction at 60v. I'll report more once I stop the 219 chain from constantly falling off. Currently at 3500w no problempic 5 (600 x 450).jpg
Where did you get the 219 sprocket for the motor? And is the belt and 428 drive motor the same thing? The belt one is always cheaper, isn't it better to buy it and swap to 219, if I need 219 anyway.

Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 3:14am

Guys! It semms there is an issue with the sprockets.

QS sold me last year the 1000W motor and claimed to be shipped with 420 sprcket. So I ordered a chainring and a matching 420 chain, just to find out the sprcket is not 420. It's indeed made for a 428 chain. 428 motorcycle chain on 1000W motor!??

Because there is this special axle I am not able to find a sprocket manufactor to finally get a 420 sprocket. I asekd Judy from QS motor to get a 420 sprocket. She told me they are waiting for production. This is now 6 weeks ago. Still no production. Does anyone has a source of this sprocket? Judy sent me the drawing.
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QS 1000W mid drive motor sprocket.pdf
Sprocket size.
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Tommm   100 kW

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Re: qs 1000w builds

Post by Tommm » Aug 03 2020 3:24am

Centurio wrote:
Aug 03 2020 3:14am
Guys! It semms there is an issue with the sprockets.

QS sold me last year the 1000W motor and claimed to be shipped with 420 sprcket. So I ordered a chainring and a matching 420 chain, just to find out the sprcket is not 420. It's indeed made for a 428 chain. 428 motorcycle chain on 1000W motor!??

Because there is this special axle I am not able to find a sprocket manufactor to finally get a 420 sprocket. I asekd Judy from QS motor to get a 420 sprocket. She told me they are waiting for production. This is now 6 weeks ago. Still no production. Does anyone has a source of this sprocket? Judy sent me the drawing.
I'm in the same boat but need 219. I think our best bet is to have a machine shop make an adapter for a sprocket we can buy for cheap. So we can use consumable parts off the shelf and no need to custom order. My motor is tapered axle. I got the 219 cog from lightning rods once I get it I will supply a local cnc shop motor, old sprocket and new sprocket.
Sia motor already sent me drawing of motor axle.

Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 3:34am

Yeah, I was thinking about an adapter too. But would the axle not be to large to fit the "standard" front sprockets?

Tommm   100 kW

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Re: qs 1000w builds

Post by Tommm » Aug 03 2020 6:13am

Centurio wrote:
Aug 03 2020 3:34am
Yeah, I was thinking about an adapter too. But would the axle not be to large to fit the "standard" front sprockets?
It is too large to fit 12mm and 15mm sprockets. You need 3/4" which is 19.05mm.
http://lightning-rods10.mybigcommerce.c ... w-adapter/
I am going for this one, 12t still possible because it has cutouts.

The adapter will be a conical shape.

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Skaiwerd   100 W

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Re: qs 1000w builds

Post by Skaiwerd » Aug 03 2020 6:29am

This seller has been away for almost a year. I think a piece of soft copper flashing could work as a bushing instead, I’ll keep you guys posted my Ebike workshop is almost done!
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922D5B23-08A7-41AB-9240-ED7FF1EDF3D0.jpeg
Only place I could find one and I can’t order it, doh!
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Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 6:43am

This adapter is a really good idea Tommm. Like this we could use any sprocket with a center hole big ennought.

@Skaiwerd
Your Idea is also very good. But copper seems to be too soft material for this kind of torque. Or am I totally wrong here?


It bugs me that much, because Judy told me the sprocket costs 6USD. I would pay the double or more to get finally what I payed for last year... A *** 420 sprocket for this stupuid tempered axle!

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Overclocker   10 kW

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Re: qs 1000w builds

Post by Overclocker » Aug 03 2020 7:07am

420 and 428 are very similar. 428 roller dia is just a bit bigger so it's possible to grind a 428 sprocket into a "420"

how do i know? because i've done it :lol:

Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 7:11am

Well, good idea. I did not check if the sprocket is hardened. The theeths will get smaller. It's kind of workaround and not durable. Or how many km or miles did you run it?

larsb   1 MW

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Re: qs 1000w builds

Post by larsb » Aug 03 2020 7:51am

It’s a bad idea for long term. Bolt the sprocket you want to the outside of the sprocket that fits, if needed cut it down with an angle grinder. 1 hour job at the most :D

Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 7:58am

larsb wrote:
Aug 03 2020 7:51am
It’s a bad idea for long term. Bolt the sprocket you want to the outside of the sprocket that fits, if needed cut it down with an angle grinder. 1 hour job at the most :D
I can do that, but the hole in the sprocket must be tapered.

I can't choose a normal sprocket with a slot. There are plenty of mainstream sprockets...
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larsb   1 MW

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Re: qs 1000w builds

Post by larsb » Aug 03 2020 8:08am

just buy a hubless sprocket and make the hole oversize, they are called platewheels or sprocket "type A".
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Centurio   10 mW

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Re: qs 1000w builds

Post by Centurio » Aug 03 2020 8:30am

larsb wrote:
Aug 03 2020 8:08am
just make the hole oversize and buy a hubless sprocket, they are called platewheels or sprocket type A
Yep, this is quiet a good idea. Why I did not find it by myself. The problem will be the chainline. The engine is already quiet large and is colse to the pedal. Btw: Its a Manet Korado cyclomotor.

So it might be wise to mount the sprocket type A on the inside of the original sprocket (the motor side). But it need some distance to nohave enought space and not touching the tooths of the original sprocket...

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