GKN Hybrid Power is the developer of electric flywheel energy storage technology. This novel technology cut its teeth in top-flight endurance racing, helping to power
Audi’s R18 e-tron quattro to three successive Le Mans
24-hour race victories. Beyond motorsport, are many promising next applications in low carbon vehicles such as transit buses, HGVs, trams and trains. GKNHP’s
London bus trial has demonstrated +20% fuel savings.
The GKN Hybrid Power Mk6 FESS is an electrically driven flywheel energy storage system. The motor is a threephase permanent magnet motor. The magnets are provided by GKN Hybrid Power’s MLC (Magnetically Loaded
Composite) material which has the advantage of being both very low on eddy current losses and safe as there are no discrete magnets rotating at the very high rotor speeds of the flywheel to contain in the event of a failure.
The Mk6 FESS has integrated power electronics so that no additional inverter is required – the flywheel connects directly to the DC bus. Due to the high speed of the rotor a vacuum is required to reduce friction losses and this is provided by a flywheel mounted vacuum system. Water is supplied as an efficient cooling medium for the inverter, bearings and stator laminations, but an onboard oil system provides direct cooling to the stator coils to increase power density. This oil system heat exchanges internally with the water.
The Mk6 FESS also benefits from internal contactors on the DC bus to disconnect from the rest of the hybrid system and real time insulation monitoring of the HV circuit.
> Efficient electrically driven storage
> Safe and efficient rotor system
> Fully integrated system
> High power and duty cycle density
> No performance degradation @ high duty
Maximum Speed [rpm]
Useable Storage Energy [kJ]
Peak Power [Nm]
Continuous Duty Cycle with 600 C water inlet temparature [kW]
DC bus supply [V]
Dimensions [mm]
Mass [kg]
42000
600
170
50
600
L 392, W 378, H 339
38.3
For further information please contact:
GKN Hybrid Power
Unit 1 Pentagon South, Abingdon Science Park
Barton Lane, Abingdon, Oxford OX14 3PZ
Tel: +44 1235 468 200 www.gknhybridpower.com
For further information please contact:
GKN Driveline
Ipsley House, Ipsley Church Lane, Redditch B98 0AJ
Tel: +44 1527 517 715, Fax: +44 1527 533 666
Email: info@gkndriveline.com, www.gkndriveline.com