QS Motor QSD138A-90
QS138 90H V1 Mid Drive Motor — 4000W rated IPM PMSM inrunner with 90mm stator stack height for higher torque output. 138mm stator diameter, belt driven (default) or sprocket design. Air cooled, IP67 waterproof. Preferred for builds prioritizing torque over speed. Commonly paired with Fardriver ND72530/ND72680 or VOTOL EM200 controllers.
In brief: 4000W mid-drive motor. 48–72V rated. From $357.
Specs verified May 29, 2026
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Specifications
Motor Design
- Design
- Inrunner PMSM
- Stator Diameter
- 138mm
- Stator Height
- 90mm
- Pole Pairs
- 5
- Shaft Type
- Spline
- Cooling
- Air
Performance
- Wattage
- 4000W
- Peak Wattage
- 13500W
- Rated Voltage
- 48–72V
- Rated RPM
- 4000
- Max Torque
- 72.00Nm
Electrical
- Continuous DC Amps
- 89A
- Peak DC Amps
- 200A
- Flux Weakening RPM
- 6500RPM
Features
- PAS Sensor Type
- None
- Temp Sensor
- KTY83
- Has Encoder
- No
Physical
- Weight
- 13 kg
- Dimensions (L×W×H)
- 217mm × 162mm × 162mm
- IP Rating
- IP67
Ports & Connectors
Phase Wires3 Ring Terminals
Motor Phase
| Pin | Wire color | Function |
|---|---|---|
| 1 | Yellow | Phase A |
| 2 | Green | Phase B |
| 3 | Blue | Phase C |
Hall Sensor
Hall Sensor
| Pin | Wire color | Function |
|---|---|---|
| 1 | Red | 5V Power |
| 2 | No color | None |
| 3 | Black | Ground |
| 4 | Green | Hall A |
| 5 | Yellow | Hall B |
| 6 | Blue | Hall C |
