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Range Extender

Innovative Range Extender for Electric Cars

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The idea

The car of the future is electric. There is no doubt about that. But the question arises:
How can today's driving comfort be maintained in the future?

  • Unrestricted
  • Boundless
  • Available
  • Affordable

These are all typical connections in terms of modern mobility, but not for purely battery-powered vehicles. These are neither unlimited, affordable nor limitlessly available for movement. Regardless of the expansion of the charging infrastructure and the technological development of various battery concepts, a range extender for electric vehicles is an important component in the concept of the car of the future. This is the only way to achieve limitless, affordable and sustainable mobility.

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The somewhat DIFFERENT concept

The so-called "range extender" is of course not a new concept. However, up to now the PS traction engines, which have been highly developed over decades, have been forced into this corset. Obviously. A little modification here, some optimization there and there you go.
So why this effort?

  • Heavy
  • Large
  • Expensive

Tomorrow's electric vehicles will be equipped with a battery that allows 90 % of all daily trips to be made purely electrically before they have to be plugged back in. An internal combustion engine that is large, heavy, expensive and requires a lot of maintenance? Rather absurd.
For this reason, we have developed a concept that is small, light, low-maintenance and inexpensive to implement.
A concept especially designed for this application.

Micro-Turbine Range Extender

The Micro-Turbine Range Extender

The mechanical power is defined as P = M x n. Where M is the torque and n is the speed of a driven shaft. If one wants to achieve a high power, both the torque and the rotational speed can be increased. The increase of the torque is always accompanied by an increase of the diameter ∅ and thus an increase of the dimensions and weight.
For this reason we have decided to increase the speed.

Micro-turbines are operated at very high speeds but relatively low torques, so a compact design can be achieved. There are also a number of other advantages over conventional internal combustion engines.

  • Clean, continuous combustion
  • Possibility of burning all liquid fuels
  • Direct availability of warm air
  • Just one rotating shaft
  • Simple performance "up-scaling"
  • Small number of components
  • Reduced maintenance effort


Nominal power: 25 kW
Nominal speed: 105,000 rpm
Dimensions: ∅ = 350 mm
L = 460 mm
Weight: 45 kg (prototype)
30 kg
Generator type: Switched Reluctance
Generator phases: 3
DC link: 120 V
Cooling: Water