QS 3000w midmotor

maybe i have the 2000W motor
 
Hi Dan,

Yes I am.
 
I have contacted QS about the spline shaft option, and looks like they are not offering it anymore.
So I am planning to build a custom shaft myself. Does anyone have the full shaft drawing?
I do not have the motor yet and have asked QS about the shaft drawing, but no reply yet.

Current setup on my trials bike for max torque @ low RPM:
Original low kV (35) GNG motor with a custom shaft geared with custom 8T/62T #420
Powered by 10KW Kelly KEB limited with 150A battery current and unlimited (450A) winding current.
As the spring warmth came, I can overheat it in 5 minutes rear wheel hop jumping.
I can probably go up to 8T/68T but I doubt the motor will be much cooler and the top speed will be too low
even with 21S battery.
 
Thanks, missed that thread.
I've asked for the spline shaft from three different places: alibaba, aliexpress, and cnqsmotor contact form.
 
Thanks again.
BTW how is the QS shaft quality? My original GNG shaft was made from some cheap crappy steel and the shaft end destroyed pretty fast by high torque.
 
Finally bought 2000W motor with the spline shaft directly from cnqsmotor.
They do not have them in stock, though. Production time is 14~16 working days.

I wonder if there are some misinformation in the specs:
3000W No-load rpm: 3800rpm without flux weakening, 6000RPM with flux weakening.
2000W No-load rpm: 2800rpm without flux weakening, 4400RPM with flux weakening.
Click to expand...
That is ~36% kV difference. But from the performance tests it is only ~15%.
 
Sure, but both of them have the same 72V in the specs and the performance test/graphs.
 
Performance test data from QS:
kV is 73 for 3000W motor in test, 5213 rpm@72V
kV is 63 for 2000W motor, 4550 rpm @ 72V
image.jpeg
Both are higher than the normal noload from QS.
:arrow: You are correct. Did they test with flux weakening or are the other figures incorrect..
 
QS Motor 3000W 138 70H Mid Drive Motor

Motor Type: BLDC Permanent Magnet Inner Rotor Motor With Hall Sensor
Brand: QS Motor, QSMOTOR
Motor Design: Single axle
Matched Wheel: 12inch Wheel (as default)
Magnet Height: 70mm, 40pcs, 5 pole pairs
Diameter of stator: 138mm
Rated Power: 3000W (peak power, pending)
Rated Voltage: 72V as default
Speed: 90KPH
No-load rpm: 4400rpm without flux weakening, 6500RPM with flux weakening.
Max Torque: approx 56N.m (without Reduction ratio)
Reduction ratio: 1:4.7 (as default)
Max Efficiency: about 90%
Continuous Battery Current: pending (72V)
Peak Battery Current: 120A (72V)
Suggest Peak Phase Current: 450A
Thermic Probe: None (KTY83/122 is available for sample).
Working Temperature: pending
Single Hall Plate with waterproof connectors
16mm² Cross Section of Phase Wire (not include insulation layer)
Hall Sensor Phasing angle: 120 degree
Waterproof Grade: IP54
Color: Black

There are 2 types for the motor, and also can install 428(11T-15T) gear like below picture:
4.jpg
All the unit price for sample are $235/pc

Below is the drawing for type 1:
View attachment 5

Below is the application about the motor with 428 gear:
应用.jpg

Below are the testing report:
basic RPM
Basic RPM.jpg
With flux weakening
View attachment 2
With belt ratio 1:4.77
With belt ratio.jpg

More details, pls see attached file.

Thank you,
Judy
E-mail: judy@tzquanshun.com
 

Attachments

  • QSMOTOR SPEC for VECTOR Dirt Bike V1.2.pdf
    3.4 MB · Views: 304
If the 2000w motor gets asi4000 controllers tuned for it will that work with the 3000w motor. Has it been confirmed that the csc city slicker uses the 3000w motor ?
 
Sorry, could not understand your question clearly, could you explain?

boytitan said:
If the 2000w motor gets asi4000 controllers tuned for it will that work with the 3000w motor. Has it been confirmed that the csc city slicker uses the 3000w motor ?
Click to expand...
 
2000w mid drive motor is about 9.0kg
3000w mid drive motor is about 11kg

redline2097 said:
Whats the weight for QS 2000w and 3000w motor?
Click to expand...
 
QSMOTOR said:
Sorry, could not understand your question clearly, could you explain?

boytitan said:
If the 2000w motor gets asi4000 controllers tuned for it will that work with the 3000w motor. Has it been confirmed that the csc city slicker uses the 3000w motor ?
Click to expand...
Click to expand...

This was more of a question for the guys at electric race technologies and whoever in this thread said the csc city slicker electric motorcycle uses a qs motor.
 
The QS 3000W needs a filtering mod or different encoder to work with ASI in sensored mode. The stock hall signals do not work right with this or other sinewave controllers.

It does work well sensorless but ASI's sensorless feature sucks from a standstill.
 
flat tire said:
The QS 3000W needs a filtering mod or different encoder to work with ASI in sensored mode. The stock hall signals do not work right with this or other sinewave controllers.
Click to expand...

that needs a clarification. I guess you have experience from one motor and several controllers but not all?
My QS3000W works with both Votol EM150 and apt96600 sinewave controllers.
Could be issues with the motor, ASI controller hard to optimise etc. Did you check the signals on a scope?
 
Grantmac said:
What about flux weakening for that motor? RPM including reduction it seems?
Click to expand...

I never had problems with the halls and i am running a sabvoton 72200 at 250battamps and 500fazeamps.
Flux weakening is set at 150amps without problems.
 
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