QS 3000w midmotor
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SlowCo
1 MW
It seems to be normal right hand thread indeed.
Looks like you'll have to remove the motor and find a way to clamp the pulley in a vice and then try to loosen the nut. As right now the pulley can move/rotate too much for the impact wrench to have enough effect. Heating up (torch) the nut just before trying to loosen it might help.
Looks like you'll have to remove the motor and find a way to clamp the pulley in a vice and then try to loosen the nut. As right now the pulley can move/rotate too much for the impact wrench to have enough effect. Heating up (torch) the nut just before trying to loosen it might help.
larsb
1 MW
Would you be able to measure the diameter of the shaft at the bearing (want to know inner diameter of bearing or bearing number)
larsb
1 MW
Thanks! Can you read out the part number of the shaft seal?
larsb
1 MW
Great, thanks! I guess main shaft diameter is 25 mm then. Good news as i am considering upgrading motor with an extended axle gearbox that currently is dia 25 
On my Microcar I use a reducer of 8:1 and I just needed to replace the engine pulley to lengthen the transmission to 6:1. The engine pulley will now have 30T instead of 22T. By replacing the reducer input pulley I will be able to adjust the transmission from 6:1 to 8:1 very easily.
larsb
1 MW
I plan a two speed gearbox, gears will be direct drive and 1:2 and then a final reduction of 1:4 to the rear wheel.
Mated with the 3000w motor will give 220Nm 140km/h in direct drive and 440Nm 70km/h in first gear.
Mated with the 3000w motor will give 220Nm 140km/h in direct drive and 440Nm 70km/h in first gear.
:thumb: I am curious to see how you will make this gearbox.larsb
1 MW
Currently trying prototypes. My design concept works and i’ll order some driveable parts, if it’s still good then i’ll start a thread on it. 
j bjork
100 kW
Interesting
Are you constructing your own gearbox, or adapting an existing gearbox to the motor?
Are you constructing your own gearbox, or adapting an existing gearbox to the motor?
larsb
1 MW
It’s a completely new design. That’s why there’s a high risk for surprises along the way. If it meets my specs it’ll be good for about 20kW@5000rpm
Grantmac
10 kW
A 2 speed box like that is EXACTLY what small EVs need.
I found a great video of a moped fitted with this motor and it looks like a blast! check it out (not my video):
[youtube]DnNqPmY4Bys[/youtube]
I do actually have a question though for anyone who has this motor (and all other experts):
I plan on fitting this motor to a small rear wheel drive car (of sorts), here are some specs I am aiming for:
-weight with a driver should be below 200kg.
-max speed of 60kmh. I don't NEED high speed, I want good acceleration and wheelspin on loose/icy surface. A sporty and fun feeling is key!
-20s LiPo battery (72~84V) 150A continuous current capable
-Meant for having a bit of fun at a gravel/mud/ice track. Google "cyclekart" if you want to know what kind of a vehicle I'm planning on building.
My chosen tire (17" rim motorcycle wheel, quite smooth tire) is 560mm total diameter, and I did do some math for it:
For 60kmh top speed (at 6000ish rpm) I would need gear reduction of 1 : 10.56 and I'd get 590Nm of torque at the rear axel.
This would most likely need a 2-stage reduction, or TINY front sprocket and HUGE rear one.
Is this realistic? Am I asking too much from this motor? Specs (peak power 14kW etc) seem to be OK, but I'm no expert.
The motor seems to be a GREAT bang for the buck, but is it good enough for what I want to accomplish?
[youtube]DnNqPmY4Bys[/youtube]
I do actually have a question though for anyone who has this motor (and all other experts):
I plan on fitting this motor to a small rear wheel drive car (of sorts), here are some specs I am aiming for:
-weight with a driver should be below 200kg.
-max speed of 60kmh. I don't NEED high speed, I want good acceleration and wheelspin on loose/icy surface. A sporty and fun feeling is key!
-20s LiPo battery (72~84V) 150A continuous current capable
-Meant for having a bit of fun at a gravel/mud/ice track. Google "cyclekart" if you want to know what kind of a vehicle I'm planning on building.
My chosen tire (17" rim motorcycle wheel, quite smooth tire) is 560mm total diameter, and I did do some math for it:
For 60kmh top speed (at 6000ish rpm) I would need gear reduction of 1 : 10.56 and I'd get 590Nm of torque at the rear axel.
This would most likely need a 2-stage reduction, or TINY front sprocket and HUGE rear one.
Is this realistic? Am I asking too much from this motor? Specs (peak power 14kW etc) seem to be OK, but I'm no expert.
The motor seems to be a GREAT bang for the buck, but is it good enough for what I want to accomplish?
larsb
1 MW
Yes. 590Nm is 590Nm, can’t go wrong there. Worst thing that could happen is that you want more, buy another motor, put it on the same axle for 1200Nm. That’ll be enough :wink:
larsb
1 MW
Yes, never actually gotten it warm on the outside, 100-120A won’t be an issue.
larsb
1 MW
never opened one but the windings should be reachable from the harness side if you remove complete side cover (not the hall sensor cover)
Really interested in these motors from qs, does anyone have any experience with the 1000 and 2000w versions?
Seeing that some people have pushed the 3000w version to 15-20kw and 10kw continuous I'd love to know what the 1000 and 2000w versions would be capable of even as a rough estimate?
Also does anyone know if the 1000w version is available with a 420/428 sprocket/shaft anywhere?
Any advice would be great!
Seeing that some people have pushed the 3000w version to 15-20kw and 10kw continuous I'd love to know what the 1000 and 2000w versions would be capable of even as a rough estimate?
Also does anyone know if the 1000w version is available with a 420/428 sprocket/shaft anywhere?
Any advice would be great!
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