QS Motor QSJ138F-55
QS138 55H Encoder Mid Drive Motor with Internal Gearbox — 2500W rated IPM PMSM inrunner with encoder sensor and helical gear reduction. 138mm stator diameter, 55mm stack height. 4700 RPM. Spline drive shaft output. Air cooled, IP67. The encoder version enables use with Fardriver encoder controllers (ND-b series) for smoother commutation.
In brief: 2500W mid-drive motor. 48–72V rated.
Specs verified Jun 23, 2026
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Specifications
Motor Design
- Design
- Inrunner PMSM
- Stator Diameter
- 138mm
- Stator Height
- 55mm
- Pole Pairs
- 5
- Shaft Type
- Spline
- Internal Gear Ratio
- 1:2.35
- Cooling
- Air
Performance
- Wattage
- 2500W
- Rated Voltage
- 48–72V
- Rated RPM
- 4700
Features
- PAS Sensor Type
- None
- Temp Sensor
- KTY83
- Has Encoder
- Yes
Physical
- 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 |
Encoder
Hall SensorTemperature
| Pin | Wire color | Function |
|---|---|---|
| 1 | Red | 5V Power |
| 2 | Black | Ground |
| 3 | Yellow | Encoder A |
| 4 | Green | Encoder B |
| 5 | Blue | Encoder Z (Index) |
| 6 | Orange | Motor Temp |
| 7 | White | Ground |
| 8 | No color | None |
