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

QS138 90H (4000w)

Regular price$649.00
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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

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


EM-150 & EM-200 Controller

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 recomended ratings.


Max Battery Current: 300 amps

Max Output: 22,000w or 22kw

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