New motor: QS 138 90H V3 4kw mid drive motor with 1:2.35 gear box

[john61ct]

I wish they had precise model #s

https://www.aliexpress.us/item/3256804487876683.html

Please discuss this motor here

other motors only in comparison, please use other threads for getting into the weeds on any other topics, or starr your own it's Free!

My interest specifically is heavy cargo utility only, climbing long steep hills, compare with Lightning Rod's bigger motors

separate RH drivetrain from pedaling using Rohloff or other strong hub

But any other appropriate use cases welcome, all about this specific motor

...

SiAECOSYS / QS MOTOR

Taizhou Quanshun Electric Drive Technology Co.,Ltd

https://siaecosys.aliexpress.com/store/1101505808

Be careful about any other reseller websites

My contact Judy Gong

Skype: judy.gong5

WeChat/Whatsapp: +86 13575887162

https://m.facebook.com/judy.gong.775

Office Tel: +86 0576 88551619

 

[john61ct]

Suggestions please for specific controllers currently available

to allow for getting maximum torque at lower RPM ranges, as in starting from a standstill facing up a big hill.

Assume 50+ pounds of top notch cells at whatever the best voltage is, max speed say 20mph on the flat with a tailwind.

Likely FOC would be best right?

 

[j bjork]

Something with enough phase A and MTPA would be best as far as I know, I think a good candidate would be Hesc cl1000
https://3shulmotors.com/shop/cl1000/?v=f003c44deab6

Not sure if 1000pA is enough to get max torque at low rpm though, a fardriver nd961800 should do the trick otherwise.
But I dont think it can take advantage of the motors saliency on low rpm, someone with better knowledge will have to chime in what would be best.

Higher voltage would be better, but hard to find controllers for it.

 

[j bjork]

I might as well note that higher voltage wont give more torque, but higher rpm.
Then you can gear lower, and get higher torque on the wheel.

When I wrote my comment I expected you wanted hillclimb like this: https://www.youtube.com/watch?v=aEmy6xA7DpY
Maybe not that agressive, more like what a 250 on regular gas can do.

Then I saw "20mph with a tailwind"
Tell me it is not about getting a bicycle up a hill again :?

 

[john61ct]

I would have thought much more than 1000 pA would be required to get the most out of a motor explicitly rated to handle 4kW by the manufacturer.

Yes in my case, always about pushing cargo up the big mountains.

Never about fun, or speed.

If you find that use case annoying, feel free to ignore it, and use the thread for other scenarios, so long as centering around this motor.

 

[john61ct]

Tell me it is not about getting a bicycle up a hill again :?

https://www.reddit.com/r/CargoBike/comments/zpx55q/anyone_else_take_their_cargo_bike_to_hill_climbs

 

[Hummina Shadeeba]

Something with enough phase A and MTPA would be best as far as I know, I think a good candidate would be Hesc cl1000

C1000 / CL1000 With Phase Filters, IMU and DC-DC Converter - 3ShulMotors

Max. Battery Voltage: 126 V Max. Battery Current: 500 A Max. Phase Current: 1000 A

3shulmotors.com

Not sure if 1000pA is enough to get max torque at low rpm though, a fardriver nd961800 should do the trick otherwise.
But I dont think it can take advantage of the motors saliency on low rpm, someone with better knowledge will have to chime in what would be best.

Higher voltage would be better, but hard to find controllers for it.

Is there a guide you can direct me to for setting up MTPA? I’m finding very little info. I’ve got the cl1000 and qs138 motor

 

[j bjork]

I am no vesc expert, but I think you just activate the function when the motor is set up properly.