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 Jul 18, 2026
Where to Find
Prices tracked across 3 sellersPrice History
Price History
Price changes tracked by the crawler
Current best price $402.94. Over the past 90 days: low $402.94, high $468.70, average $465.05 — down 13% vs average.
- AliExpress
- AliExpress - SIA Tech Store
All Records
3 price records in this period
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress(1 record) | |||||||||
| Jun 13, 202604:59 PM | $402.94 | — | $402.94 | Initial | — | — | — | Yes | active |
AliExpress - SIA Tech Store(2 records) | |||||||||
| May 29, 202608:21 PM | $468.70 | — | $468.70 | $0.00 | SSUS60−$60.00 | — | — | No | active |
| May 28, 202605:55 PM | $468.70 | — | $468.70 | Initial | — | — | — | No | active |
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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 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 |
