QS138 90H 72V IPM PMSM Mid Drive Motor


This motor is perfect for medium to large size electric motorcyles. With its extra long body compared to the 70h model you will be able to achieve a higher torque and power. This motor is capable of over 35kW Bursts! 



1pc X QS 138 4kW Mid drive motor (tapered shaft with key) with 14T 428 sprocket


Key Features 

  • Light weight and small dimension compared to other motors of similar power outputs
  • V configured rotor design allows for higher RPM with flux weakening
  • High Torque suitable for high performace high load situations such as climbing and racing.
  • Supports regenerative braking
  • Proven reliability

QS138 90H (4000w)

SKU: QS1384W
  • Motor Type: BLDC IPM

    Brand: QS Motor, QSMOTOR

    Motor Design: Single Axle

    Matched Tire: 17 inch

    Magnet Height: 90mm, 5 pole pairs

    Rated Power: 7500W

    Peak Power: 13.5kW

    Rated Voltage: 72V

    Speed: 4000RPM

    With Flux Weakening(RPM): 6500RPM

    Rated Torque: 14.3N.m

    Max Torque: 72.N.m

    Cooling Method: Air Cooling

    Max Efficiency: 94%

    Continuous Battery Current: 89A

    Peak Battery Current: 200A

    Thermic Probe: KTY83/122 (as default)

    Working Temperature: 70-120C, peak 150C

    Hall Sensor: Single Hall Set with Waterproof Connectors

    Phase Wire: 20mm2 Cross Section (not include insulation layer)

    Waterproof Grade: IP67

    Color: Black

    N.W./G.W.: approx 13kgs/14kgs

    Package Dimensions: 34cmx34cmx33cm/piece