Electric Machines for Propulsion

LaunchPoint Technologies has been developing high specific power, high efficiency electric machines for demanding, high-reliabilty applications.  The machines are an axial flux (“pancake”) design based on dual-halbach-array magnet rotors and ironless stators.  This combination of design features allows for an extremely high efficiency motor with good specific power.  The motors are air cooled and create their own air flow so no additional cooling system or fan is required.

LaunchPoint 8-Inch Halbach Array Motor

82 kW machine presently in development:

      • 82kW at 6200 rpm, 95% efficiency
      • 12.7 kg (28 lb)
      • 6.5 kW/kg (4 hp/lb)
      • .33 m diameter (13 inches)

 

 Alternator Integrated with Gen-Set7.5 inch alternator integrated with gen-set:

      • 10 kW at 7500 rpm
      • 16 kW at 12,000 rpm
      • 1.5 kg mass (electric machine only)
      • 6.6 kW/kg @ 7500 rpm
      • 10 kW/kg @ 12,000 rpm

 

Dual-Stack Machine with Planetary Gear SetProposed integration of dual-stack machine with a
planetary gear-set for power and torque density:

      • 32 kW, 2500 rpm
      • 4.8 kg
      • 6.7 kW/kg

 

 

Large Scale Electric MachineElectric machines can scale to large sizes.
Proposed 1 MW motor:

      • 200 m/s tip speed
      • 1 MW at 6,000 RPM
      • ~70 kg (projected)
      • 95% efficient
      • 26” diameter
      • Up to 13 kW/kg