Technical Data Sheet: 255-EZI72-085
Ratings at 2,500 RPM
| Duty | Power | Torque |
|---|---|---|
| Continuous | 4.2 kW | 16.5 Nm |
| 60 minutes | 5.2 kW | 20.3 Nm |
| 15 minutes | 6.5 kW | 29.3 Nm |
Rated current is 85 Arms. Peak output is 9 kW and 49.2 Nm at 425 Arms.
Specifications
| Model number | 255-EZI72-085 |
|---|---|
| Frame size | 255 |
| Motor type | PM synchronous, interior magnet |
| Rated voltage | 72 VDC |
| Rated power | 4.2 kW |
| Peak power | 9 kW |
| Rated torque | 16.5 Nm |
| Peak torque | 49.2 Nm |
| Rated speed | 2,500 RPM |
| Rated / peak current | 85 Arms / 425 Arms |
| Torque constant | 0.194 Nm/Arms |
| Efficiency | Designed for 93% |
| Insulation class | H |
| Protection class | >IP64 |
| Winding material | 100% Copper |
| Magnet | NdFeB |
| Temperature sensor | PT 1000 |
| Bearings | 6207-2Z/C7, 6207-2Z/C7 |
| Cooling | Natural Air Cooled, Forced Air Cool |
| Weight | 31 Kg |
| Mounting | Flange, Foot |
16.5 Nm continuous at 2,500 RPM · 49.2 Nm peak · 255 frame · interior-magnet rotor
The 255-EZI72-085 is a 4.2 kW permanent magnet synchronous motor for a 72 V bus, rated 16.5 Nm at 2,500 RPM continuous. It holds 6.5 kW and 29.3 Nm for 15 minutes, and peaks at 9 kW. It weighs 31 Kg and mounts flange, foot.
The rotor is interior-magnet, so it adds reluctance torque to the magnet torque and tolerates field weakening well — it holds useful power further above base speed than a surface-magnet motor of the same frame. Suited to hydraulic power units, traction drives and pump packages, where a single reduction stage is normal.
Ratings are published at three duty points rather than one headline figure. Size the motor so its continuous rating covers the average of the duty cycle and its 15-minute rating covers the worst peak — the full 72 V range has 63 models if this one sits slightly wrong.
Quality and compliance
Manufactured at our ISO 9001:2015 certified plant in Faridabad, India. Designed and tested to IEC 60034 — performance and rating to IEC 60034-1, IP64 enclosure to IEC 60034-5, mounting designations to IEC 60034-7, and Class H insulation to IEC 60085.
Every motor is individually tested before dispatch, not batch-sampled: winding resistance, insulation resistance, high-voltage withstand, back-EMF constant, no-load and loaded run, and temperature rise. Test reports are available on request.
Performance Curves
Where this motor is used
- Hydraulic power units on 72 V mobile and industrial equipment
- Traction drives through a single reduction stage
- Pump packages where continuous duty matters more than peak speed
- Compressors and industrial fans in the mid speed range
Applications
Related ratings
Next step down: 255-EZS72-055 at 4.0 kW, next step up: 255-DZS72-060 at 4.8 kW. See also the 72V motor guide and the full PMSM range from 24 V to 565 V.