utf8 QSMOTOR 3000W 5000W 138 70H electric motorbike new mid drive motor for electric motorcycle | QSMOTOR

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QS 138 3kW 72V100KPH Mid drive motor with new appearance sprocket design

Price:US $273.00/piece
Production Period:12~13 working days
  • QS 138 3kW 72V100KPH Mid drive motor with new appearance sprocket design

QS 138 3kW 72V100KPH Mid drive motor with new appearance sprocket design



For 138 3000W sprocket design mid drive motor kit assembly, it could be used for electric light motorcycle, which could be 72V 100KPH.

e.g. Dirt bike

E-motorcycle weight, approx 130kg+2*80kg

Speed: continuous 100km/h

Gear ratio: 1:2.3*3 (double steps transmission )

Climbing slope: 30°@208kg

Battery: 72V52h

Tire: 0.6138 130/70-17


You can click below picture for Aliexpress purchasing link.





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, 14T as default


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1



Dimension Drawing:


  • QS 3kW 138 mid drive motor belt axle (new appearance V2)

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.



Conversion kits for QS 3kW V2 sprocket axle mid dirve hub motor


We're able to supply Controller, Speedometer, Twist throttle..etc.


138 二代 齿轮轴




Application for QS 3kW sprocket driven mid drive motor




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