QS90 (1000W) - Electro & Company Inc.
QS90 (1000W) - Electro & Company Inc.

QS90 (1000W)

Regular price$349.00
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QS90 72V IPM PMSM Mid Drive Motor

This motor is perfect for small electric motorcyles. This is the most compact version of the infamous 138 70h model. If you have a kids bike or a pocket rocket the qs90 might be right up your alley. With a small Diamater of only 4 inches, You can fit this motor in almost anything! Although this motor is tiny it is no slouch! This motor is capable of over 7kW Bursts! 


1pc X QS 90 1kW 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
  • High Torque suitable for high performace high load situations such as climbing and racing
  • Supports regenerative braking
  • Proven reliability


Motor Type: BLDC Permanent Magnet Inner Rotor Motor With Hall Sensor

Brand: QS Motor, QSMOTOR

Motor Design: Single Axle 

Matched Wheel: 10inch Wheel (as default)

Magnet Height: 80mm, 5 pole pairs

Diameter of stator: 120mm

Rated Power: 1000W

Rated Voltage: 60V or 72V (as default)

Speed: 60V@45KPH; 72V@55KPH

Max Torque: approx 25.2N.m without Reduction ratio, approx 134.0N.m with 1:5.3 Reduction ratio  

Max Efficiency: 90.5%

Thermal Probe: None as default (KTY83/122 is available, please let sales know if needed).

Hall Sensor: Single Hall Plate with waterproof connectors

Phase Wire: 6mm² Cross Section (not include insulation layer)

Hall Sensor Phasing angle: 120 degree

Waterproof Grade: IP54

Color: Black 

N.W./G.W.: 7.8kgs/9.1kgs   

Package Dimension: 34cmx34cmx33cm


EM-50 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 for any motor pushed beyond QS recomended ratings.


Max Battery Current: 75 amps

Max Output: 5,400w or 5.4kw

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