Press
Munich, March 24, 2015

Siemens develops world-record electric motorfor aircraft Technical milestone: five times more powerful than comparable motors
 Larger electrically powered aircraft now a real possibility

Siemens researchers have developed a new type of electric motor that, with aweight of just 50 kilograms, delivers a continuous output of about 260 kilowatts –five times more than comparable drive systems. The motor has been speciallydesigned for use in aircraft. Thanks to its record-setting power-to-weight ratio, larger
aircraft with takeoff weights of up to two tons will now be able to use electric drives
for the first time.
To implement the world-record motor, Siemens’ experts scrutinized all thecomponents of previous motors and optimized them up to their technical limits. New
simulation techniques and sophisticated lightweight construction enabled the drive
system to achieve a unique weight-to-performance ratio of five kilowatts (kW) perkilogram (kg). The electric motors of comparable strength that are used in industrial
applications deliver less than one kW per kg. The performance of the drive systems
used in electric vehicles is about two kW per kg. Since the new motor delivers its
record-setting performance at rotational speeds of just 2,500 revolutions per minute,it can drive propellers directly, without the use of a transmission. “This innovation will
make it possible to build series hybrid-electric aircraft with four or more seats,” said
Frank Anton, Head of eAircraft at Siemens Corporate Technology, the company’s
central research unit. The motor is scheduled to begin flight-testing before the end of2015. In the next step, the Siemens researchers will boost output further. “We’reconvinced that the use of hybrid-electric drives in regional airliners with 50 to 100
passengers is a real medium-term possibility,” said Anton.

Siemens AG
Communications and Government Affairs
Head: Stephan Heimbach
Reference number: PR2015030156COEN

Wittelsbacherplatz 280333 Munich
Germany
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Press release

The development of this motor was supported by the German Aviation Research
Program LuFo in a project of Grob Aircraft and Siemens.

In 2013, Siemens, Airbus and Diamond Aircraft successfully flight-tested a series
hybrid-electric drive in a DA36 E-Star 2 motor glider for the first time. The test
aircraft had a power output of 60 kW.

This press release, press images and additional material is available atwww.siemens.com/press/electric-motor-plane

Contact for journalists
Florian Martini
Tel.: +49 89 636-33446; e-mail: florian.martini@siemens.com

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Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence,innovation, quality, reliability and internationality for more than 165 years. The company is active in more than 200
countries, focusing on the areas of electrification, automation and digitalization. One of the world’s largest producers
of energy-efficient, resource-saving technologies, Siemens is No. 1 in offshore wind turbine construction, a leading
supplier of combined cycle turbines for power generation, a major provider of power transmission solutions and apioneer in infrastructure solutions as well as automation, drive and software solutions for industry. The company isalso a leading provider of medical imaging equipment – such as computed tomography and magnetic resonanceimaging systems – and a leader in laboratory diagnostics as well as clinical IT. In fiscal 2014, which ended on
September 30, 2014, Siemens generated revenue from continuing operations of €71.9 billion and net income of€5.5 billion. At the end of September 2014, the company had around 357,000 employees worldwide. Further
information is available on the Internet at www.siemens.com.

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Reference number: PR2015030156COEN

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