QS 3000w midmotor

Electric Motors and Controllers
larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 14 2018 2:18am

bionicon wrote:
Jul 10 2018 3:50pm

I run 19" wheels and 1 : 6 to the rear
What's your top speed? The spec sheet you got states noload RPM at 3800 but their test is over 5000! Makes me doubt the kV calculation i did.

Do you know the kV for your motor?

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Jul 15 2018 1:24pm

My kv is 73 top speed is arround 70km per hour with foc

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 15 2018 1:47pm

Ok, thanks! :D
I will get one with a chain sprocket. Could you post a pic of the axle interface? I wonder how easy it will be to eventually replace the sprocket or get a selection of sizes.

Did they have 219 chain sprockets?

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 16 2018 8:44am

larsb wrote:
Jul 13 2018 2:35am
I'd be interested. Pm sent.
I won't be buying Monstarrs motor, it's free for anyone that's interested!

I decided instead to buy a motor and controller kit from QS. Their Votol EM150S controller seems interesting: Hall angle setting, Flux weakening and error debug screen. plus it's prematched to the motor :D
VOTOL EMController Manual V2.0.pdf
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Last edited by larsb on Jul 16 2018 10:53am, edited 1 time in total.

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Jul 16 2018 10:43am

larsb wrote:
Jul 15 2018 1:47pm
Ok, thanks! :D
I will get one with a chain sprocket. Could you post a pic of the axle interface? I wonder how easy it will be to eventually replace the sprocket or get a selection of sizes.

Did they have 219 chain sprockets?
You best email to qs they make the axle like you want for me they make it work for 420 sprockets.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 16 2018 11:25am

OK, i'll ask QS. So your axle was a custom order? How much extra did you pay?

I currently have a 5/8" axle with 3/16 keyway.
It's easy to source for 420 chain and sprockets or go-kart sprockets in #35 pitch

Is that what you got or did you get some other spec? I'd be happy if you can share it.
Last edited by larsb on Jul 25 2018 10:02am, edited 1 time in total.

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Jul 16 2018 3:06pm

I have pics of the axle on my pc at home, will post them soon.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 18 2018 3:44pm

I asked QS for a quote for the same axle i have on the Revolt motor. Lets see the response.
image.jpeg
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I think QS should be able to make some business with this axle option provided as a standard choice; it's cheap to get sprockets, there's a wide selection of sizes available and the longer axle provides a bit of freedom in the motor positioning, you can also easily fit an outer axle support bearing if you want to.

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Jul 20 2018 9:09am

qs 160mm motor klein (2).jpg
qs 160mm motor klein (2).jpg (189 KiB) Viewed 966 times
Dont know how much more it did cost for making this axle

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 20 2018 2:14pm

That looks solid, thanks for the pic.
They are making a qoute for my axle request, hopefully not too expensive. Eventually the sprocket will wear out so i need it to be easily available.

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 25 2018 8:46am

QS are not wanting to do a custom axle following my request.

The axle for the QS 2kw and 3kw mid drive motor is the same according to carrie at QS.

It's a tapered shaft from approximately dia 16mm to dia 24mm in 20mm with a metric woodruff key (5x6.5x16).

I can't seem to find sprockets for this. Anyone know a source and if it's a standard interface?
Darwing mid drive motor 120 2000W.pdf
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larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 28 2018 3:23am

I've ordered motor, Votol EM150S controller and the rear belt pulley from QS. Looking forward to trying it :D

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eee291   10 kW

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Re: QS 3000w midmotor

Post by eee291 » Jul 30 2018 7:39am

I just received the Motor from Monstarr, and OMG the thing is bigger than it looks on the pictures :lol:

I got a Machinist who could make it fit a 12T sprocket for my Derbi Senda. But I'm wondering If I can't get the Rear belt pulley like larsb, and use that on my Derbi.

I wonder if a 1:4.77 reduction isn't too fast for a 17'' Wheel though. I initially wanted to do a 1:6 gear reduction, since I have a bunch of hills around my house. :?

QS 3000 vs D 3000 lol
Image

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 30 2018 8:19am

eee291 wrote:
Jul 30 2018 7:39am

I got a Machinist who could make it fit a 12T sprocket for my Derbi Senda. But I'm wondering If I can't get the Rear belt pulley like larsb, and use that on my Derbi.

I wonder if a 1:4.77 reduction isn't too fast for a 17'' Wheel though. I initially wanted to do a 1:6 gear reduction..
If you do a conversion of the axle, please share some pics :D

I agree that the original 1:4.7 reduction will probably be too fast and weak with 17" wheels, it's 105km/h at 72V without flux weakening. If it doesn't work out then i'll bolt a smaller 420 sprocket directly to the front pulley, should be pretty simple.

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madin88   100 MW

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Re: QS 3000w midmotor

Post by madin88 » Jul 30 2018 8:36am

QS 3000 vs D 3000 lol
Thats another good example that Watt numbers say nothing about the size. See it more like a series number or just a product name :)
This motor likely can do 3 to 4 times the power it was rated for, maybe even real continuous with good cooling.

Regarding the belt drive i also think that a reduction of 4,77 will be to weak in therms of torque for your application. It was designed for small scooter wheels.
But belt drives ROCK because they are very silent, and regen works excellent (similar to a hub drive)! IT would be the best choice at least if you don't ride to much offroad or in the mud (belts don't like sand and mud).
Maybe you can find a larger pelt pulley from another supplier?

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eee291   10 kW

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Re: QS 3000w midmotor

Post by eee291 » Jul 30 2018 8:38am

Yeah, I guess I'll go with the sprocket then. I got a New old Stock Derbi axle that I could try to adapt to the Motor, or have my friend slot the original one, but I think that would be much harder and more expensive.

Edit: I looked everywhere for a bigger pulley, but the price is already in the 100's of €

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Jul 30 2018 9:29am

Since the axle is M16 which is normally 15.8mm on the outside it's very close to the 5/8" axle diameter at 15.875

Maybe it's as easy as doing a slot for the 3/16" key :D

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Jul 31 2018 10:44am

madin88 wrote:
Jul 30 2018 8:36am
QS 3000 vs D 3000 lol
Thats another good example that Watt numbers say nothing about the size. See it more like a series number or just a product name :)
This motor likely can do 3 to 4 times the power it was rated for, maybe even real continuous with good cooling.

Regarding the belt drive i also think that a reduction of 4,77 will be to weak in therms of torque for your application. It was designed for small scooter wheels.
But belt drives ROCK because they are very silent, and regen works excellent (similar to a hub drive)! IT would be the best choice at least if you don't ride to much offroad or in the mud (belts don't like sand and mud).
Maybe you can find a larger pelt pulley from another supplier?
Thats true, i am shore if i raise voltage from 58 to 84 volt it will do easy 17kw, for me now 11,5 kw is enough.
At this time its one of the best middrive motor for the money you can buy.

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eee291   10 kW

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Re: QS 3000w midmotor

Post by eee291 » Aug 12 2018 4:46am

Hi guys it's been a slow month

But I finally finished it. Not quite how I wanted it but the sprockets had 4 M6 holes, so I got went the larsb way :D

I may purchase another front belt pulley from QS and try again. Since I don't have any machine shop near me that can work on the Axle.


Some pics: https://imgur.com/a/8X5Fq8R


Little side note:

The M6 Stainless Steel bolts were pressed into the pulley not screwed, after the threaded part of the sprocket, the Bolt was machined down to 5mm. My friend said i'd make the holes bigger and there would be even less metal for the screw to hold on to, if we threaded the holes in the pulley.

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skeetab5780   10 MW

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Re: QS 3000w midmotor

Post by skeetab5780 » Aug 12 2018 9:40am

Subd that motor looks like a beast! It better be at 30lbs

larsb   10 kW

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Re: QS 3000w midmotor

Post by larsb » Aug 12 2018 9:49am

eee291 wrote:
Aug 12 2018 4:46am
Hi guys it's been a slow month

But I finally finished it. Not quite how I wanted it but the sprockets had 4 M6 holes, so I got went the larsb way :D

I may purchase another front belt pulley from QS and try again. Since I don't have any machine shop near me that can work on the Axle.


Some pics: https://imgur.com/a/8X5Fq8R
Looks good and functional! Did you turn down the pulley to only keep the axle and key interfaces?

Is pulley made of steel or alu?

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eee291   10 kW

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Re: QS 3000w midmotor

Post by eee291 » Aug 12 2018 10:08am

Pulley is made from 100% steel (I thought it was plastic at first)

Yes I kept the original axle and pulley because my friend doesn't feel like it in the summer because he has no AC :roll:

I think I'm gonna weld the next one.


Also, the Motor doesn't quite weigh 30lbs. More like 24lbs with all the wires put on the scale.

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brumbrum   100 kW

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Re: QS 3000w midmotor

Post by brumbrum » Aug 13 2018 5:02am

Apaologies if this is off topic, but i have an LMX 161 and wanted to know what would be the best upgrade motor that has been mentioned in this thread? I would like to avoid any fabrication of the nice lmx frame if possible.
Thanks
Andrew :)
My NYX and cromotor build
viewtopic.php?f=6&t=74615
My LMX 161 dirt bike build
viewtopic.php?f=6&t=94074

bionicon   100 W

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Re: QS 3000w midmotor

Post by bionicon » Aug 13 2018 9:21am

I think you better ask at lmx for the 80mmstator motor.

redline2097   100 W

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Re: QS 3000w midmotor

Post by redline2097 » Aug 21 2018 7:18am

This one or Golden Motor 5/10kw for Go Kart build? :)

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