Products · Motors

High Power Density Motors

Enabling Efficiency and Power Without Rare-Earth Materials

See how the motors work ↓

Higher Performance, Lower Cost, No Permanent Magnets

Hyper Tech has developed the technology to build high power density, highly efficient motors in the 60 kW to 3 MW range that do not use permanent magnets currently dominating the transportation motor market.

Driven by several factors, primarily a need to reduce carbon monoxide (CO) and carbon dioxide (CO2) emissions, it is becoming common knowledge that the world is moving toward electrically powered transportation. The development of electric motors powered by batteries, fuel cells or turbine generators for automobiles, buses, trucks and aircraft is rapidly accelerating. For electric motors to displace existing fossil fuel-based technology, these motors need to be configured so that they have both high power density and high efficiency in order to produce machines that are lighter weight and produce less waste heat.

The Problem with Permanent Magnet (PM) Motors

At this time, the electric motor industry is rapidly moving toward high power density and high efficiency by configuring motors with rare-earth permanent magnet (PM) rotors. However, this is a grave mistake because over 90% of the world’s rare earth PM market is controlled by one overseas country that recently consolidated all the companies in their domestic industry into one large state-owned entity. Because one country controls the PM market, they control the PM-based motor market and will control it well past 2035. Shortages of PM material are already predicted between 2025-2035, and the cost of PM material will undoubtedly skyrocket due to these shortages.

A Superior, Cost-Effective Alternative

The electric motors manufactured by Hyper Tech for the transportation industry are induction, and not designed to use PM material. Our electric motor is asynchronous (induction) configured with aluminum conductors in the rotor and stator. At ambient and cryogenic temperatures, these induction motors can meet and exceed the power density and efficiency of current and even future PM based motors. Aluminum and transformer steel are the primary materials in our induction motor, both of which are low cost and which will make ours the lowest cost option for transportation electric motors. These will be lower cost than PM motors by 30 - 40%, even if PM costs do not increase as much as expected. Power density and efficiency are driving factors in the transportation industry.

Motor TypePower Density (kW/kg)Efficiency
State-of-the-Art PM Motors3-5~93%
Future PM Motors (projected)8-10up to 97%
Hyper Tech Ambient Induction Motor8-17over 97%
Hyper Tech Superconducting MotorExceeds 30over 98%

Covering the Full Spectrum of Power Needs

In summary, Hyper Tech potentially has motor products to cover the entire electric transportation power range. The ambient and cryogenic temperature induction motors will cover the 60 kW to 3 MW range of current and projected applications. This covers the very high-power density motors in the 2 - 10 MW range needed for single and double aisle passenger aircraft. In addition, Hyper Tech has conceptual designs for all-superconducting motors with a power density of over 30 kW/kg, again, with no PM based materials being used. We have already demonstrated a 1 MW ambient temperature motor with a world record power density of 10 kW/kg.

Ambient Temperature Motors

  • 60 kW to 2 MW motors for electrified vehicles, ships and aircraft, including eVTOL

Cryo-Cooled Motors

  • 1 - 3 MW motors for single and double aisle electrified aircraft.
  • Higher power densities than non-cryogenic systems are enabled in machines that are designed with incorporating an advanced thermal management system (TMS) for synergistic cooling while safely utilizing liquefied bio-natural gas (Bio-LNG).

Superconducting Motors

  • 2 - 10 MW motors for single and double aisle electrified aircraft.

How it works

More power per kilogram, with no magnets

An induction motor needs no permanent magnets. The stator’s coils create a magnetic field that rotates; that field induces currents in the rotor’s bars, and the rotor is pulled round after it. Hyper Tech’s designs push this proven principle to much higher power density.

The rotating field

Three coil phases switch in turn. The rotor follows, slightly slower than the field.

Induction motor cross-sectionA stator ring with coils in three phases lights up in sequence, creating a rotating magnetic field shown by an arrow. Currents induced in the copper rotor bars make the rotor turn, a little slower than the field. FIELD
Phase APhase BPhase CRotor bars, no magnets

Power density and efficiency

From the comparison table above.

Power density by motor typeState-of-the-art permanent-magnet motors 3 to 5 kW per kg at about 93 percent; future permanent-magnet motors 8 to 10 at up to 97 percent; Hyper Tech ambient induction motor 8 to 17 at over 97 percent; Hyper Tech superconducting motor exceeds 30 at over 98 percent.

One family across electric transport

Power range of each Hyper Tech motor type, on a log scale.

Power rangesAmbient temperature motors 60 kW to 2 MW for vehicles, ships and aircraft including eVTOL; cryo-cooled motors 1 to 3 MW for single and double aisle aircraft; superconducting motors 2 to 10 MW for single and double aisle aircraft.
The motor drawing is a simplified illustration of the principle. Chart and range values are from Hyper Tech’s figures on this page.