EMRAX 348 - Page 5

User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 5
Dear Customer,
Congratulations on your purchase of the EMRAX high performance electric motor.
This drive is a Slovenian product of a completely new type of pancake axial flux synchronous permanent magnet electric motor,
which will keep its capability for a long time if treated properly. It can also work as a generator with the same performance
characteristics. The drive was developed for airplanes, where reliability is extremely important. Therefore, our target was to
build a reliable, low weight, high power direct drive electric motor with high efficiency.
The drive was developed and tested by Roman Sušnik, dipl. ing. (Company EMRAX d.o.o., till March 2016 company name was
Enstroj d.o.o.). The first prototype was mounted onto the glider airplane Apis EA2 in 2008, when also the 1st electric flight in
Slovenia and the 3
rd
in the world was made. The motor was also laboratory tested in Piktronik d.o.o (January 2011), Siemens
GmbH (May 2012) and Letrika d.d. (November 2014). Furthermore, our customers give us test results from their projects to
confirm our test data. In February 2014 thermal tests were performed on EMRAX motors. The motor was exposed to shock tests
from -40°C to +160°C for 17 days (24h/day), this means 408 hours non-stop. EMRAX passed this examination with excellent
results, without any damages.
Meaning of EMRAX name:
- EM stands for the Electric Motor,
- R is the first letter of the innovator’s name, who is Roman
- AX stand for the axial magnetic flux
EMRAX motor features:
- Axial Flux
- Permanent magnet synchronous motor
- Input type: sinusoidal three phase
- Lightweight - best in class power density (up to 10 kW/kg)
- High torque at low RPM
- Highly efficient (up to 98%)
- Reliable (developed and produced for the airplane industry)
- Compact and high-quality product
- IP21 or IP65
- EMC Compliant – E marked (complies with essential protection requirements of 89/336/EEC)
- Low cost
- 3 Cooling options (Air/Liquid/Combined)
- Low noise
- No vibrations
- Stacking capability (two same sized motors connected on the same shaft)
The EMRAX engine can achieve high power even at relatively low rotation speeds due to high torque. It allows a gearless drive
without the usual step-down gear unit which causes power losses, additional weight, complexity and maintenance. In the case
where the lower output rotation is needed the reduction drive can be used, which allows even higher torque (power stays the
same).
The EMRAX motor ranks as the best high power density motor in the global market. Its power density is very high – up to 10
kW/kg. EMRAX motors have the best-in-class power density. The mechanical and no load electrical loses are very small, so
EMRAX can run on high RPM – in which case very high motor power can be achieved (up to 300 kWp – e.g. EMRAX 348 type).
EMRAX motors use less material more efficiently to provide higher power densities than any comparable motor or generator.
Though many intensive tests have already been made and despite the parts being produced by modern CNC machines, the
motor is still not a real series product. Many manufacturing processes are still made by hand, which makes every drive unique.
Therefore, our customers are and will be part of the field test, thus we are already excited about the experiences they will make
with the new motor.