QS 3000w midmotor
- Thread starter bionicon
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larsb
1 MW
Nice to get an "official" power number from QS 
I am sure that for a short period of time it can be even higher. I put 250A into it at 80V for a few bursts and i couldn't feel any heat at all.
With the new controller i can push 600A, battery cannot cope with it so i don't know how much i get.. but output from motor is even higher than before. Motor is capable of more than 20kW in bursts.
I am sure that for a short period of time it can be even higher. I put 250A into it at 80V for a few bursts and i couldn't feel any heat at all.
With the new controller i can push 600A, battery cannot cope with it so i don't know how much i get.. but output from motor is even higher than before. Motor is capable of more than 20kW in bursts.
WOW 
Regarding some russia guys who disassembled the 3000W motor (YT vid) the size of the rotor is:
85mm diameter x 70mm length
thats always helpful if you compare differnt motors and you wondering which one can do more (peak) torque.
At least i found out that it is meaningful if the motors you compare were designed properly (in terms of steel saturation).
85mm diameter x 70mm length
thats always helpful if you compare differnt motors and you wondering which one can do more (peak) torque.
At least i found out that it is meaningful if the motors you compare were designed properly (in terms of steel saturation).
larsb
1 MW
Could you link the vid?
redline2097
100 W
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- Jun 17, 2015
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https://youtu.be/JnELgPgL-1o?t=367
^^ at 8:14 they take measurements on the rotor
Does anybody run this motor with an FOC controller which can apply field weakening starting from 0 RPM?
As for instance 70% q-axis current (normal phase current) and 30% d-axis current (field weakening current) everytime.
Does anybody run this motor with an FOC controller which can apply field weakening starting from 0 RPM?
As for instance 70% q-axis current (normal phase current) and 30% d-axis current (field weakening current) everytime.
larsb
1 MW
Why would you do it? As far as i know you'll get lower torque and efficiency and get speed, which you don't need at low speed.. ?
This is APT AE96600 flux weakening screen.
Seems you can do pretty much what you want
This is APT AE96600 flux weakening screen.
Seems you can do pretty much what you want
Yes if we talk about motors which have surface mounted magnets than this is the case. you trade efficiency to get higher RPM and you should only use it if you ran out of RPM (and then not until 70-80% of top speed).larsb said:
But those QS midmotors have an IPM rotor (magnets are covered in steel laminations), so it will be able to produce the so called reluctance torque additionally to the magnet torque if you apply flux weaken current.
This means on IPM motors you could gain speed and torque with field weakening current, not just speed.
here is a thread about that:
https://endless-sphere.com/forums/viewtopic.php?f=6&t=95100
and here is a test about hyundai HSG IPM motor:
http://build-its-inprogress.blogspot.com/2017/11/stall-torque-test-stand.html
Regarding the graph from the stall torque tests, it works like this:
On the left we see 100% nomal phase current (orange curve) which was adjusted to 100% D-axis current on right (blue curve). The sum (vector) of the phase current stayed the same.
I believe on surface manget motors the torque would just get lower and lower from left to right down to 0Nm on the far right (where D-axis current will only make heat).
at around 170A Q-axis current + 0A D-axis current you get out about 36Nm at 0RPM -> 170A total phase current
at around 115A Q-axis current + 125A D-axis current (in the middle) you get out about 56Nm at 0RPM -> sqrt(115² +125²) = 170A total phase current
edited: i confused Q and D
conclusion:
you would get about 50% more torque out of this hyundai HSG IMP motor if you drive it with 50/50% D+Q current.
at least thats how it should be as far as i understood the whole thing... please correct me if i am wrong!
This is APT AE96600 flux weakening screen.
evdrive9.png
Seems you can do pretty much what you want
You should find out what those settings stand for and then try it out.
@ bionicon
you mentioned that you have set 150A field weakening on sabvoton. Did you notice more torque at take off, or just more speed?
devo1223
100 W
Thanks for explaining ipm motors. I got interested in this motor when Valilisk mentioned it in his controller thread. I'm on the list for the 12F and I want to pair it with the QS 1000w for my next middrive build. I was thinking low volts/high amps so I would not need so much gear reduction for the trail then maybe increase the flux weakening for the street but it sounds like if torque increases also then I would want flux weakening all the time? I'm I understanding correctly, does ipm motors with flux weakening now allow us to spin motors at higher rpm's with lower voltage more efficiently?
devo1223
100 W
Are the ultra and BBHD ipm motors?
larsb
1 MW
Interesting!
I'll see if i can get a manual for the APT controller, i think the different current sets for field weakening can be used like a lookup table but without a dyno it might be of little use.
I'll see if i can get a manual for the APT controller, i think the different current sets for field weakening can be used like a lookup table but without a dyno it might be of little use.
larsb
1 MW
I'd start with a bunch of added LED heat sinks, there's a lot of space for them on the motor.
I REALLY like to know how it pairs with the BAC8000
I REALLY like to know how it pairs with the BAC8000
you and me bothdevo1223 said:
Exactly. It is more effecitve bacause of the additional reluctance torque you get if you apply field weakening (D-axis) current.
If the magnets are placed interior than it is IPM. The motor on the left has surface mounted magnets.devo1223 said:
larsb
1 MW
I got this link on IPM motors, starts after ten minutes:
https://training.ti.com/teaching-old-motors-new-tricks-part-4-foc-ac-induction-motors-operation-ipm-motors-maximum-torque#
https://training.ti.com/teaching-old-motors-new-tricks-part-4-foc-ac-induction-motors-operation-ipm-motors-maximum-torque#
SlowCo
1 MW
jonnydrive
100 W
bionicon said:larsb said:Ok, thanks!
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.
I asked QS for #420 and 10 Tooth sprocket, the same axale also seems to fit perfectly with the JTF259 sprockets #428
View attachment 2
http://www.jtsprockets.com/catalogue/sprocket/JTF259/
View attachment 1
jonnydrive
100 W
Bartosh said:
I asked QS for 420#, I recived the ones in the picture above,
Sorry but I have no idea if it is the default axale or not
My 1000w qs middrive motor came with this 8mm pitch timing belt pulley. I think the 2000W and 3000w motors will also ship this way unless you plan otherwise with the supplier. I ordered from Alibaba but see no real advantage of doing so. Special requests would likely have to come from qs motors directly. Box read cnqsmotor.com as there’s also this one qs-motors.com that’s probably just another reseller.
Thanks guys. I just thought it might be possible to remove the front pulley to get to the axle. So this way I could just get rid of the pulley and put a standard 420/428 sprocket. If the chain noise became too annoying, I would get back to the original setup. Seems like it's not gonna be possible without modifying the axle.
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