Fraunhofer IISB has developed a 750 kW permanent-magnet traction motor for hybrid-electric regional plane, hitting 8 kW/kg energy density by means of a mixture of thin-lamination electrical metal, hairpin windings and direct oil-spray cooling.
The machine makes use of NO15 (0.15 mm) electrical metal—a thin-lamination grade that reduces eddy present and AC losses at excessive rotational speeds—to help the 8 kW/kg goal in a 94 kg bundle.
| Spec | Worth |
|---|---|
| Rated energy | 750 kW @ 65 °C oil coolant |
| Rated velocity | 21,000 rpm |
| Torque | 350 Nm |
| Energy density | 8 kW/kg |
| Weight | 94 kg |
| Dimensions | D 250 mm × L 600 mm |
| Electrical metal | NO15 (0.15 mm) |
| Cooling | Direct oil spray |
| Winding | 4×3 section hairpin, 4 unbiased sections |
The stator makes use of a 4×3 section hairpin winding association with 4 electrically decoupled sections, every pushed by its personal inverter. Distributing the windings this fashion improves fault tolerance: a failure in a single part doesn’t take down the others. Hairpin windings additionally enable increased present density within the slot and higher thermal contact with the stator core than standard round-wire coils. Direct oil spray cooling manages the ensuing warmth load, enabling rated energy at 65 °C coolant temperature.
The motor is Fraunhofer IISB’s contribution to Mission AMBER, a Clear Aviation EU program focusing on a ~2 MW hydrogen gas cell hybrid-electric propulsion system for regional plane. The structure is a parallel hybrid, pairing the IISB motor/generator with Avio Aero’s Catalyst superior turboprop engine. GE Aerospace can be a part of the consortium. AMBER targets at the least 30% CO₂ discount at entry into service in comparison with 2020-era regional plane.
The motor was developed totally at Fraunhofer IISB—idea, CAD, manufacturing, meeting and validation—in accordance with aerospace requirements.
Supply: Fraunhofer IISB
