Definition
The Emrax 228 is a brushless electric aircraft engine produced by Emrax d.o.o, a Slovenian manufacturer. It is designed for use in electric aircraft and other high‑performance, weight‑critical applications.
Overview
Developed by Emrax d.o.o (formerly Enstroj) of Kamnik, Slovenia, the Emrax 228 belongs to the company’s series of axial‑flux permanent‑magnet synchronous motors. The engine’s compact size and high power‑to‑weight ratio make it suitable for direct‑drive propulsion of aircraft propellers without the need for a reduction gearbox. It has been referenced in the World Directory of Light Aviation and is marketed for both experimental and light‑sport electric aircraft.
Etymology / Origin
The designation “Emrax 228” derives from the manufacturer’s brand name, Emrax d.o.o. The numeric component follows the company’s internal naming convention for its product line (e.g., Emrax 207, Emrax 268). No further publicly documented meaning of “228” has been confirmed.
Characteristics
| Parameter | Specification |
|---|---|
| Type | Brushless electric aircraft engine (axial‑flux permanent‑magnet) |
| Operating Voltage | 130 V nominal |
| Power Output | 100 kW (134 hp) peak; 55 kW (74 hp) continuous |
| Torque | Up to 220 Nm (peak) |
| Efficiency | Up to 98 % |
| Speed | Low working rpm, allowing direct‑drive of propellers |
| Cooling | Air‑cooled, with optional liquid‑cooling for higher‑performance variants |
| Dimensions | Length: 86 mm (3.4 in); Diameter: 228 mm (9.0 in) |
| Dry Weight | 12 kg (≈ 26.5 lb) |
| Power‑to‑Weight Ratio | Approximately 8.3 kW · kg⁻¹ |
| Reduction Gear | None (direct‑drive) |
| Applications | Electric aircraft propulsion, UAVs, lightweight electric vehicles, other high‑power‑density uses |
Related Topics
- Electric aircraft propulsion – broader field encompassing electric motors, power electronics, and energy storage for aircraft.
- Axial‑flux motors – motor architecture offering high torque density, used in many Emrax models.
- Emrax product line – includes other models such as Emrax 207, Emrax 268, and Emrax 348, each targeting different power and voltage ranges.
- Brushless DC (BLDC) and permanent‑magnet synchronous motors (PMSM) – fundamental motor technologies underlying the Emrax 228.
- Light‑sport and experimental aircraft – categories of aircraft where electric propulsion systems like the Emrax 228 are increasingly being evaluated.