QS 3000w midmotor

Electric Motors and Controllers
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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 08 2019 10:17am

The thread is clockwise to tighten. I tried in both directions but it does not move.

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 08 2019 11:39am

I checked the unscrewing is done well in anti-clockwise direction. I think my impact wrench is too weak.

SlowCo   100 kW

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Re: QS 3000w midmotor

Post by SlowCo » Sep 08 2019 12:06pm

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.

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 08 2019 12:27pm

yes I think it's tight with red Loctite. Normally I can disassemble the alternator pulleys like this without any problem.

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 10 2019 12:31am

IMG_20190909_161050_resize_6_compress17.jpg
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It's good for me, I managed to disassemble the nut by hand with a 24 key and a claw key to lock the pulley. I also heated the shaft to remove the varnish.
IMG_20190909_161205_resize_69_compress69.jpg
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larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 10 2019 12:44am

Would you be able to measure the diameter of the shaft at the bearing (want to know inner diameter of bearing or bearing number)
Ride on :D

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 10 2019 1:32am

Sorry for the light :confused:
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larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 10 2019 2:48am

Thanks! Can you read out the part number of the shaft seal?
Ride on :D

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 10 2019 5:38am

Number is XJKD-TC-25-45-7-1
25mm interior
45mm external
7mm thickness
1 for a lip I guess :?
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larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 11 2019 11:38pm

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 :D
Ride on :D

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 12 2019 12:03am

Yes as you can see on my third picture in the message of September 10 at 8:32 the axis is 25mm and the size of the shaft seal confirms the measure.

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 12 2019 12:14am

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   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 12 2019 12:48am

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.
Last edited by larsb on Sep 13 2019 1:35pm, edited 3 times in total.
Ride on :D

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Sep 12 2019 1:55am

Whaow !! Impressive !! :shock: :thumb: I am curious to see how you will make this gearbox.

larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 12 2019 2:10am

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. :bolt:
Ride on :D

j bjork   1 kW

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Re: QS 3000w midmotor

Post by j bjork » Sep 12 2019 4:45am

Interesting :)
Are you constructing your own gearbox, or adapting an existing gearbox to the motor?

larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 12 2019 5:42am

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
Ride on :D

Grantmac   10 kW

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Re: QS 3000w midmotor

Post by Grantmac » Sep 12 2019 12:25pm

A 2 speed box like that is EXACTLY what small EVs need.

erajomppa   1 mW

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Re: QS 3000w midmotor

Post by erajomppa » Sep 27 2019 4:31pm

I found a great video of a moped fitted with this motor and it looks like a blast! check it out (not my video):



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   100 kW

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Re: QS 3000w midmotor

Post by larsb » Sep 27 2019 5:05pm

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:
Ride on :D

erajomppa   1 mW

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Re: QS 3000w midmotor

Post by erajomppa » Sep 28 2019 3:47am

In that case, I'd probably put one motor on each wheel ;)

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Oct 02 2019 1:52am

Hello someone use this engine at 8 or 10kW nominal ? I speak well of nominal power and not the peak power for a few seconds.

larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 02 2019 12:14pm

Yes, never actually gotten it warm on the outside, 100-120A won’t be an issue.
Ride on :D

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PITMIX   100 W

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Re: QS 3000w midmotor

Post by PITMIX » Oct 02 2019 2:18pm

Thank you 120A gives me a lot of margin.
Do you know the best place to install a temperature sensor ?

larsb   100 kW

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Re: QS 3000w midmotor

Post by larsb » Oct 02 2019 3:32pm

never opened one but the windings should be reachable from the harness side if you remove complete side cover (not the hall sensor cover)
Ride on :D

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