QS Motor QSJ138A-70
QS138 70H V3 Mid Drive Motor with Internal Gearbox — 3000W rated IPM PMSM inrunner with 1:2.35 helical gear reduction. 5500W continuous, 25+ kW peak burst. 138mm stator diameter, 70mm stack height, 5 pole pairs. Spline drive shaft output, compatible with 428 chain sprockets. Air cooled, IP67. The go-to motor for Sur-Ron/Talaria class e-motorcycle conversions — 72V @ 100 km/h capable.
In brief: 5500W mid-drive motor. 48–72V rated. From $379.
Specs verified May 29, 2026
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Specifications
Motor Design
- Design
- Inrunner PMSM
- Stator Diameter
- 138mm
- Stator Height
- 70mm
- Pole Pairs
- 5
- Shaft Type
- Spline
- Internal Gear Ratio
- 1:2.35
- Cooling
- Air
Performance
- Wattage
- 5500W
- Peak Wattage
- 25000W
- Rated Voltage
- 48–72V
- Rated RPM
- 4000
- Max Torque
- 80.00Nm
Electrical
- Flux Weakening RPM
- 6500RPM
Features
- PAS Sensor Type
- None
- Temp Sensor
- KTY83
- Has Encoder
- No
Physical
- Weight
- 12.2 kg
- Dimensions (L×W×H)
- 234mm × 150mm × 150mm
- IP Rating
- IP67
Ports & Connectors
Phase Wires
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 |
