utf8 QSMOTOR 3000W 6000W 138 70H electric motorbike mid drive motor for electric motorcycle | QSMOTOR

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QS MOTOR 138 3000W new version mid drive motor sprocket 428 and EM150SP controller for electric dirt bike

Price:US $503.00/piece
Production Period:10~12Working days
  • VOTOL EM150SP Controller
  • QSMOTOR 3000W 138 70H Electric bike new mid dirve motor with sprocket driven and EM150SP controller
  • QSMOTOR 138 3KW 70H V2 Sprocket axle design

QS MOTOR 138 3000W new version mid drive motor sprocket 428 and EM150SP controller




For 138 3000W mid drive motor kit assembly, it could be used for electric scooter, electric motorcycle.

It could be 72V 100KPH.

By the way, new 3kW mid drive motor doesn't have assemble kits, it's only available for separate selling.

It can be designed as belt driven ( default ) and sprocket design ( Optional ).


You can click below pic for Aliexpress purchasing link.



3kw 二代 428 SIA



Key Features


1). Simplify to make a electric-motorcycle. Gearbox, transmission shaft, clutch are no need. Which save space.

2). It could be installed in the rear to save more space for battery.

3). Support regenerative braking

4). High efficiency: 85~92% 



Product description


Genearlly Spec:


  1. Item: QS Motor 3000W 138 70H Mid Drive Motor
  2. Motor Type: BLDC Permanent Magnet Inner Rotor Motor With Hall Sensor
  3. Brand: QS Motor, QSMOTOR
  4. Motor Design: Single axle 
  5. Matched Wheel: 12inch Wheel (as default)
  6. Magnet Height: 70mm, 40pcs, 5 pole pairs
  7. Diameter of stator: 138mm
  8. Rated Power: 3000W
  9. Rated Voltage: 72V as default
  10. Speed: 100KPH 
  11. No-load rpm: 3800rpm without flux weakening, 6000RPM with flux weakening.
  12. Max Torque: approx 56N.m without Reduction ratio, approx 247N.m with 1:4.77 Reduction ratio  
  13. Reduction ratio: 1:4.77 (as default)
  14. Max Efficiency: 88%
  15. Continuous Battery Current: pending (72V)
  16. Peak Battery Current: 120A (72V)
  17. Suggest Peak Phase Current: 450A
  18. Thermic Probe: None as default (KTY83/122 is available, if you need, please let sales man know).
  19. Working Temperature: Pending
  20. Single Hall Plate with waterproof connectors
  21. 16mm² Cross Section of Phase Wire (not include insulation layer)
  22. Hall Sensor Phasing angle: 120 degree
  23. Waterproof Grade: IP54
  24. Color: Black 
  25. N.W./G.W.: 10.8kgs/11.5kgs   
  26. Package Dimension: 34cm*34cm*33cm
  27. Axle matched with 428 sprocket, teeth optional(12T, 13T, 14T(as default)...etc)


P.S.: For 3kW 138 new mid drive motor, it can be designed as belt driven.(As default)

If you want to buy such mid drive motor, please kindly click below picture.


138 V2 皮带轮+EM150SP




Dimension Drawing:


  • QS 3kW 138 mid drive motor(new appearance, belt driven)

Drawing for V2 138 mid drive motor



Please noted:


Optional appearance, drawing, performance curve/test report are available. 

If you need more technical information, please feel free to contact us.

We will give you reply in 12hours.




Matched controller recommendation:


  • Item: EM150SP sine wave controller
  • Net weight: 2040g
  • Rated current: 180A
  • Boost current: 220A
  • Peak current: 470A
  • Max. Power: 12960W
  • Flux Weaking Ratio: 100~250%
  • Max. Efficiency: 88~93%
  • Degree of protection: IP67






Application for QS 3kW sprocket driven mid drive motor


Other QS Motor Products
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