QS Motor QSJ138J-90
QS138 90H Liquid Cooled Mid Drive Motor with Internal Gearbox — 4000W rated IPM PMSM inrunner with liquid cooling jacket and helical gear reduction. 138mm stator diameter, 90mm stack height. For sustained high-power e-motorcycle applications where air cooling is insufficient.
In brief: 4000W mid-drive motor. 48–72V rated. From $403.
Specs verified Oct 18, 2026
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Specifications
Motor Design
- Design
- Inrunner PMSM
- Stator Diameter
- 138mm
- Stator Height
- 90mm
- Pole Pairs
- 5
- Shaft Type
- Spline
- Internal Gear Ratio
- 1:2.35
- Cooling
- Liquid
Performance
- Wattage
- 4000W
- Rated Voltage
- 48–72V
Features
- PAS Sensor Type
- None
- Temp Sensor
- KTY83
- Has Encoder
- No
Physical
- 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 |
