Halbach Array Electric Motor

High-Efficiency, High-Power-Density, Halbach Array Electric Motor

Halbach Electric Motor Prototype

LaunchPoint has completed optimization and initial prototyping for a high efficiency, high power density, Halbach array electric motor. With a total weight of only 1.4 pounds, this motor produces 7 horsepower at 8400 rpm with 95 percent efficiency. At 5 horsepower per pound, this motor has a higher power density than any other motor on the market. The brushless, axial flux permanent magnet design is highly tolerant of temperature and centrifugal effects, and the ironless rotor and stator eliminate iron eddy-current and hysteresis losses. Motor development is ongoing.

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Halbach Electric Motor Cross Section

LaunchPoint received initial development funding through a Phase I Small Business Innovation Research (SBIR) grant from the Defense Advanced Research Projects Agency (DARPA). DARPA is interested in using the motor in electrically-propelled Unmanned Aerial Vehicles (UAVs).

Although the current design is only 6 inches in diameter and less than 1 inch thick, this high power density motor design can be scaled and adapted for larger applications such as:

 

  • Larger electrically-powered and hybrid Unmanned Aerial Vehicles (UAVs)
  • Electrically-propelled manned aircraft and underwater vehicles
  • Wheel motors in automobiles and motorcycles
  • Wheel motors for scooters, bicycles, and other lightweight transportation devices

 

Halbach Motor Exploded View

The light weight and high power density provided by this new motor design enable:

 

  • Extended battery life
  • Longer ranges
  • Larger payloads

 

Several defense manufacturers and multiple branches of the US military have expressed interest in this specific motor design. The LaunchPoint Halbach array electric motor, with its ideal combination of power, efficiency and light weight, offers the best solution for applications where performance is critical.

Demonstration of Early Prototype