QS 3000w midmotor

Electric Motors and Controllers
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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Dec 03 2020 2:36am

Qs made an important commercial gesture on shipping costs when ordering a Qs 138 90H and they supplied the motor shaft for the 70H in addition to 2 different gears.
The video :
https://youtu.be/ExonkHtjLsg
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

Shazzy   10 mW

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Re: QS 3000w midmotor

Post by Shazzy » Dec 07 2020 5:39pm

I have the new V2 138 motor with the spine shaft. I wanted to fit a 520 sprocket - anyone managed to do this without any issues?

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Dec 08 2020 2:17am

The latest version of the Qs 138 70h in version 2 is now available with the keyed motor shaft for a pulley and an adapter for a 428 14T pinion. It's good news.
https://fr.aliexpress.com/item/10050016 ... f02&is_c=N
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

HrKlev   1 kW

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Re: QS 3000w midmotor

Post by HrKlev » Dec 09 2020 2:18am

Shazzy wrote:
Dec 07 2020 5:39pm
I have the new V2 138 motor with the spine shaft. I wanted to fit a 520 sprocket - anyone managed to do this without any issues?
JTF1903 sprocket. Ebay got lots of them. Its a tight fit if the motor is brand new, but if it has been running with the sloppy stock sprocket it glides right on. Nothing a small dead blow hammer wont fix, though.
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Hubdrive as middrive, with torque sensing EMTB build: viewtopic.php?f=6&t=107622

6x6 conversion: viewtopic.php?f=34&t=109567

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Dec 09 2020 7:31am

You should replace the 2 sprockets with larger diameter models to reduce the stress on the motor and reduction shafts as well as the chain. You can keep the same ratio between the 2 sprockets, but simply increase the number of teeth on the 2.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

HrKlev   1 kW

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Re: QS 3000w midmotor

Post by HrKlev » Dec 09 2020 11:05am

Yeah, I probably should. Could not find a bigger sprocket for the gearbox than 12T, so I would have to get some custom made. I need to get this thing (6x6 atv) up and running asap, so I will have to go back and fix some things later.
Hubdrive as middrive, with torque sensing EMTB build: viewtopic.php?f=6&t=107622

6x6 conversion: viewtopic.php?f=34&t=109567

Soap_62   10 µW

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Re: QS 3000w midmotor

Post by Soap_62 » Jan 03 2021 3:24pm

Hello, bringing up the sprocket thing again, i got the QS 138 90H 4kw with the Tapered Hub.
It comes with an 14t sprocket, wich looks very very bad :? , and i dont want to shred a chain on it.. :wink:

Did anyone find an fitting sprocket for this tapered shaft ? (looks like the Pulley mount shaft, page 11 this thread)

(tapered from 25mm to 21 with woodruf key)

larsb   10 MW

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Re: QS 3000w midmotor

Post by larsb » Jan 07 2021 3:43pm

It’s not a standard interface. best bet is to grind it down and just bolt the sprocket you want to the outside of the mount. Could be done with simple tools.

rider119   100 mW

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Re: QS 3000w midmotor

Post by rider119 » Jan 13 2021 3:11pm

PITMIX wrote:
Dec 03 2020 2:36am
Qs made an important commercial gesture on shipping costs when ordering a Qs 138 90H and they supplied the motor shaft for the 70H in addition to 2 different gears.
The video :
https://youtu.be/ExonkHtjLsg
How do you plan to swap the rotor shaft? Are the laminations just keyed in place? No epoxy or anything holding them there?

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Jan 14 2021 12:56am

I don't know it's not my motor and my friend hasn't tried replacing the shaft yet. For the moment he has welded the pinion, and if one day the shaft breaks he will replace it.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

guiga   100 mW

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Re: QS 3000w midmotor

Post by guiga » Mar 06 2021 10:39am

hey how do you guys remove the pulley from the motor? i got a QS 138 90H 4kw and already broke my bearing removal tool. the bolt nut was hard but my inpact wrench did the job.
157750709_337986617613457_4662724328720175229_n.jpg
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flippy   10 MW

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Re: QS 3000w midmotor

Post by flippy » Mar 06 2021 1:04pm

heat up the sprocket with a butane burner used for copper pipes.
The bitterness of low quality remains long after the sweetness of low price is forgotten

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Mar 06 2021 1:37pm

You must use a plumber's claw wrench to lock the pinion and a wrench with an extension to remove the nut. With an impact wrench it does not work. The nut is glued with varnish, it needs to be heated slightly.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

guiga   100 mW

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Re: QS 3000w midmotor

Post by guiga » Mar 06 2021 5:41pm

Already remove the nut , now i have to wait for a new removal tool. I will try to heat up a bit carefully , dont wanna damage the seal.

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Mar 07 2021 1:37am

You don't need any special tool to remove the pulley just have a rubber mallet and a triangular shaped shim to insert between the pulley and the motor flange. With a few small blows of the mallet the pulley will come out. If you damage the seal it is easily replaced. The reference is written on it, it is a standard model.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

Stevebequik   100 mW

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Re: QS 3000w midmotor

Post by Stevebequik » Mar 07 2021 4:47pm

Does anyone have real world Kv’s of the 138 3kW vs the 4kW.
On my bike, I have a massive 82t rear sprocket to get the performance I’m looking for. But it’s just too easy for the chain to get full of mud and cause problems.
Wondering if the 4kW 138 90, may have a lower Kv.
Would love to be able to keep the simplistic single reduction.

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Mar 07 2021 5:06pm

The data of the engines are real in the descriptions. The Qs 3kW has an actual kV of 73. The Qs 4kW runs at 7000rpm maximum so the kV is 97.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

j bjork   100 kW

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Re: QS 3000w midmotor

Post by j bjork » Mar 07 2021 5:20pm

From what I can tell the kv of my 138 70h is 60, not 73.

Stevebequik   100 mW

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Re: QS 3000w midmotor

Post by Stevebequik » Mar 07 2021 6:32pm

I agree, my 70 has a Kv of 60 and this corresponds to the nuc controller reading of 300eKv for a 5 pole motor. The 2kw qs 120 only has a Kv of around 38.
Was hoping the 90h may of been less then the 70, but looks likes it could be much higher.

john61ct   100 GW

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Re: QS 3000w midmotor

Post by john61ct » Mar 07 2021 8:52pm

Higher kV means more amps / torque at low speeds right? Slower top speed?

That's what I want.

Why do people use the 3kW / 4kW designators?

138 205 273, coupled with the 50h 70h designator

is just so much clearer. What do those latter actually refer to?

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Mar 08 2021 2:54am

A higher kV means that the motor runs faster for the same voltage. kV =RPM/Volt.
The speed of the vehicle will depend on the transmission; for the same transmission the motor with the larger kV will make the vehicle run faster. The kV 73 I get it in Foc mode, 5920rpm with 20s battery. Without this effectively the kV is 60.
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Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

Grantmac   10 kW

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Re: QS 3000w midmotor

Post by Grantmac » Mar 08 2021 11:55am

I would have expected the larger motor to be slower wind and so need less reduction.

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PITMIX   1 kW

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Re: QS 3000w midmotor

Post by PITMIX » Mar 08 2021 3:24pm

I think the goal is to approach the maximum speed of a motorcycle heat engine. With this engine you would need a 2-speed gearbox.
Aixam 550 Twin retrofit Qs 138 70H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/621300/nNlect ... #msg621300
Yamaha TDR 125 retrofit Qs 138 90H, Nuc 24F, LG 20s 60Ah
https://cyclurba.fr/forum/714639/retrof ... #msg714639
Keeway City 50 retrofit Qs 120 70H, Nuc 12F. LG 20s 30Ah
https://cyclurba.fr/forum/698717/e-scoo ... &pageprec=

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tylerwatts   100 W

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Re: QS 3000w midmotor

Post by tylerwatts » Mar 09 2021 11:25am

PITMIX wrote:You don't need any special tool to remove the pulley just have a rubber mallet and a triangular shaped shim to insert between the pulley and the motor flange. With a few small blows of the mallet the pulley will come out. If you damage the seal it is easily replaced. The reference is written on it, it is a standard model.
Be very careful, this can damage the bearings. Best to use some gentle heat to warm the sprocket and the correct extractor tool to pull it off the shaft.

Cheers
Tyler


guiga   100 mW

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Re: QS 3000w midmotor

Post by guiga » Mar 09 2021 3:42pm

Yeah i will do it like you said, im just waiting for bether quality tool. Got a 10 tooth tapered custom made from uk on the way. Its a bit longer in the shaft but is probably the only choise at the moment.

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