QS138 90H (4000w) - Electro & Company Inc.
QS138 90H (4000w) - Electro & Company Inc.

QS138 90H (4000w)

Regular price$649.00
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This motor is perfect for medium to large size electric motorcycles. 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! 


1- 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 performance high load situations such as climbing and racing.
  • Supports regenerative braking
  • Proven reliability


  • EM-150 Controller
  • EM-200 Controller
  • EM-260 Controller

Specification (via QS)

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

E&C Findings

Based on our testing we have come up with some alternative ratings. These ratings are strictly our opinion and warranty will not be provided beyond QS recommended ratings.


Max Battery Current: 300 amps
Max Output: 22,000w or 22kw

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