ENSTROJ - electric motor innovation

phone: 00386 82053850 
e-mail: info@emrax.com
skype: enstroj
ENSTROJ d.o.o
Pod hribom 4
SI - 1235 Radomlje
Slovenia

 

About Us

Enstroj is a company which is devoted to technological development, production and sale of high-powered, low-weight, high-efficient EMRAX electric motors, controllers and other electric components (chargers, balancers ...).

The company's manufacturing facilities are located at Radomlje, near the capital of Slovenia – Ljubljana.

Products quality is based on the years of experiences, knowledge, care for natural environment and future-focused view.

Enstroj holds the patents for the EMRAX electric motors. Patent no.: P-201500146.

 

History

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Enstroj company was established in 1991. Since then it has been producing and developing unique innovative objects for many different organizations – TV stations, theatres, opera ... Firstly many products have been made for self use and then became the selling products - for example: cars, transmission gears, electric propulsion system.

In the year 2000 we directed into electric motor development, because there was no suitable electric motor in the world market for our application – electric glider plane. After years of researches and tests of the motor, we reached our goal - in 2009 we developed the prototype of world's first high-powered, low-weight, high-efficient electric motor, named EMRAX motor. The EMRAX motor was improved at the beginning of 2010. After last tests we started serial production, which brought favorable prices.

Today we are working with a number of manufacturers to provide electric motors and components for electric systems (electric drives for planes, cars, boats, wind fields ...).

 

Other products in the past

Before we started electric motor development, we had been producing and developing unique innovative objects for many different organizations – TV stations, theatres, opera ... We had been also producing other innovative products - cars, transmission gears. All of these products were made by Roman Susnik, who is director of company Enstroj. 

Here are some examples:

Unique sport cars

In 1985 it was impossible to buy a special unique sport car for affordable price.
So Roman Susnik made it by himself.

He says: “In the beginning when I was preparing the plans – I had many ideas about the shapes and which spare standard parts from other cars I could use to include in my project. First I decided to use many parts from Zastava 101. Later I improved a few things on my project, so I used the motor and some other things from Volkswagen - public car Golf turbo diesel. The shape of the car was built from polyester substance with fiberglass. Twenty-six pieces were fixed on the fundamental iron construction. This construction was the fundament for the motor, transmission gear, wheels and other necessary things too. The car looked perfect and it was the first car in Slovenia which had a unique sport design. I got the first price on the public exhibition in 1990. I made some improvements on projects for many types of cars - especially on sport cars in that time. So I made another special car which is called “ avtocross “.”

Hydroelectric power stations

Saving the energy - Why not? – If we are doing things with efficiently, we need less input of energy, we spend less money and we can get a better effect. The most important thing is: Don't pollute the world - we must save our beautiful, unique nature!

In 80´s Roman Susnik also made few HPS-s.

He says: “One of them was situated near my parent’s house. I made them because I wanted to save the energy and provide electricity for my house in case the main electric power station broke down.“

Transmission gears

In 80’s Roman Susnik also made transmission gears with 5 speeds. In that time cars had transmission gears with just four or less speeds. Nowdays we can find the cars with six gears forward and - it is common - one for reverse.

He says: “I improved the transmission gears on Zastava 101 and Yugo and added the fifth gear. I made about 150 transmission gears for five speeds between 1985 and 1987, and of course earned enough money to buy the building plot for my new house.”

House

He also designed and made his own house.

Stage scenes

Roman Susnik also made many stage scenes.  He has done many stage scenes for theatres: Mladinsko gledališče, Cankarjev dom, Narodno gledališče; TV studios: RTV, opera, fashion creators, etc. Here are a few famous scenes:

Machine tools


Developing electric motors

Electric glider plane

Roman Susnik upgrated electric glider plane Apis with electric self lunch system. He also made some improvements on the canopy and propeller shape. He added retractable wheel instead fixed.

In 2004 kit version of Apis glider plane was upgrated. Besides developing an electric propulsion system, we also change the canopy design, made more effective inner ventilation, developed the retractable wheel with shock-absorber and many new designs for electric power system. The retractable wheel improves L/D = 41:1 and it also visually improves the stream line of the plane. The doors on the body are closed when the motor with the propeller is outside or inside of the fuselage. We also made a special trailer for Apis EA1.

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For our first electric propulsion system we choose brush Lynch motor. We were flying with this brush propulsion system till 2008.

Because the brush motor was not enough powerful and reliable because the brushes were heating too much at higher power, we decided to develop brushless electric motor, which was very light and three time more powerful.

The second reason for motor development was, that there was no suitable electric motor in the world market for our application.

During the electric motor development, we developed 4 prototype motors:

1. Brushless EMRRAD 1 (March 2008)

Technical data:

  • 30 KW at 1700 RPM
  • Efficient 92%
  • Weight: 13,2 kg
  • Static thrust on glider was 125 kg with prop 1,8 m

The construction of tailor-made electric motor got issued with a patent.
Also, the EMRRAD could be suitable for EV, Boats, Wind or Hydroelectric power stations and for many other options.

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2. Brushless EMRRAD 2 (air or liquid cooled) (September 2008)

EMRRAD 2 AC:

Technical data:

  • 40 kW pick power (2min) / 30 kW constant power at 1900 RPM (air speed 25m/sec)
  • Volt-bat: 200 V
  • Max cont. motor current: 200 A/150Nm
  • Weight: 13,2 kg
  • Diameter/length: 217/117

EMRRAD 2 LC:

Technical data:

  • 40 kW pick power (2min) / 32 kW constant power at 1900 RPM
  • Volt-bat: 200 V
  • Max bat current: 200 A
  • Weight: 14,0 kg
  • Diameter/length: 217/117

3. EMRAX PROTOTYPE 1 AC (in the end of 2008)

Technical data:

  • 50 kW peak power (2min) / 40 kW constant power (2000 RPM at 200 V)
  • Max bat current: 150 A
  • Weight: 11 kg
  • Diameter/length: 222/78
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4. EMRAX PROTOTYPE 2 AC or LC IMPROVEMENTS (in the end 2009)

We made some latest improvements, before serial production of these motors (in the beginning of 2010).

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We achieve our goal – we made the lightest and at the same time the most powerful electric motor in the world.

Comparison between first bought brush motor (2005) and EMRAX brushless motor made by company Enstroj (2009):

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EMRAX motors tested on glider planes Electric Apis EA1 and Apis EA2

The EMRAX motors have been tested several times on glider plane – Electric Apis EA1 and Electric Apis EA2. Electric Apis EA1 is one of the first electric sailplanes in the world and the first one in Slovenia EU(the first flight was 18. April 2005). It can take off with an electromotor and climb up to altitude 1800 m at 50%DOD, even to altitude 3000 m at 90%DOD. The altitude depends on the percentage of the discharging of the Li-Poly batteries. The best recommended discharging of the batteries is about 50%DOD. In this case the altitude is app 1800m and the batteries can give 1500 cycles. More info here: http://kokam.com/english/product/kokam_Lipo_01.html

We developed EMRAX electric motor because there was no suitable electric motor for direct drive propeller in the world market. The high powered - BLDC electric motor EMRAX 30 kW continuous power is reliable for each altitude. It operates with minimum noise and gives high power and excellent torque at low RPM (direct drive prop) for best climbing up to 6,0 m/s.

In the future solar cells on the wings will give enough nature energy for many take offs and the plane will climb much over 3000 m of the altitude.

AMS flight used to produce APIS sail planes in many versions. The company PIPISTREL is now a new owner of APIS gliders project now. More info here: http://www.pipistrel.si/planes/721

In 2004 we got kit version of Apis EA1. Besides developing an electric propulsion system, we also change the canopy design, made more effective inner ventilation, developed the retractable wheel with shock-absorber and many new designs for electric power system. The retractable wheel improves L/D = 40:1 and it also visually improves the stream line of the plane. The doors on the body are closed when the motor with the propeller is outside or inside of the fuselage. The electric system does not produce noise, it is clean, safe, reliable and virtually maintenance free. We are in favor to make reliable innovations, which are the most important for comfortable in enjoyable flying.

Technical data and performance of glider plane Electric Apis EA2

Technical data and performance of glider plane Apis EA2 using the NEW brushless electric motor named EMRAX. The last tests on the new EMRAX air cooled prototype electric motor (Dec 2009) mounted on EA1 and the light version on the plane EA2 (2011)- show us excellent results:

Electric Apis EA2 – Technical data and performance
El motor brushless EMRAX (produced by ENSTROJ)
Electric motor weight 10,5 kg (lighter version as special prototype for airplane EA2)
Controller DC/AC - Piktronik SAC41  (aircooling)
Engine peak power (2min) 40 kW - 54 HP (aircooling 25 m/sec) at 200V DC/2000 RPM
Torque continuous/peak 130 Nm/ 220 Nm
Engine speed EA2 1800 RPM at 200V DC ( direct prop drive)
Propeller diameter EA1 1,8m
Static prop thrust (prop 1,8m) 1500 N
Batteries Li-poly - power capacity 8,0 KWh
Capacity current 40 Ah
Voltage DC 230 V
Batteries weight 55 kg
Charging time - depend of DOD 4 - 6 hours/230V
Take off distance on grass/ time 80 m ( in 8 seconds)
Take off distance on asphalt/ time 50 m ( in 5 seconds)
Max climb rate 6,0 m/s
Max altitude 50/90% discharging 1600m (3000m)
Best glide 40 : 1 at 95 km/h
Empty weight 280 kg
Max take off mass 370 kg
Max horizontal flight distance 200 km
 
 
Battery packages for electric Apis - more informations here.

Videos – EMRAX electric motor on Apis EA1

In 90 seconds climbs up to 350m - included take off. Temperature on copper EMRAX prototype 30kW (41HP) air cooling motor windings was only 70°C. Max altitude is 3000m at one charging the batteries.

Video: Take off on asphalt running way

Video: Take off Ferlach, Austria

Video: Take off, low pass, landing

 

 

Videos

EMRAX motor in Audi / Volkswagen transmission gearEMRAX motor in Audi / Volkswagen transmission gearWe are working on the electric Audi TT project.
Take off Apis EA2 - Kamnik 21.7.2013Take off Apis EA2 - Kamnik 21.7.2013Electric self launch glider plane Apis EA2 with EMRAX motor and EPROP.
Apis EA2 take off, low pass, landing in Lesce - 12th of May 2013Apis EA2 take off, low pass, landing in Lesce - 12th of May 2013Self launch electric glider plane Apis EA2 with EMRAX motor and EPROP.


The Ohio State University's CURRENT Electric Motorcycle TestThe Ohio State University's CURRENT Electric Motorcycle TestThe OSU Electric Motorcycle Team, CURRENT, tests their bike for the first time.

The lightest and the most powerfull electric motor in the world