ENSTROJ - electric motor innovation

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phone: 00386 (0) 41966065
e-mail: enstroj@siol.net
skype: enstroj
Enstroj s.p.
Pod hribom 4
SI - 1235 Radomlje
Slovenia

EMRAX motors

EMRAX motor/generator is our main product. We developed it and now we are starting serial production. EMRAX motors are suitable for electric vehicles - EV, power plants, wind and hydro power stations. The main facilities are: low weight (11,7 kg), high power, high torque, direct drive, low noise. 
They do not need mechanical gear box, so thay do not waste energy to reduce the final rotation.

Technical data

Type
Technical data
EMRAX
Air Cooled, air flow
speed 25 m/sec, 20°C
EMRAX
Liquid Cooled, water
flow 0,2 l/sec, 20°C 

Explanations

Power dc 2 min / continious
at 200 V DC [kW]
40 / 30 45 / 30 Tested at 2000 RPM
Power dc 1 min / 2 min / cont.
at 300 V DC [kW]
60 / 50 / 30 60 / 50 / 35 Tested at 3000 RPM

RPM at 200 V / 300 V DC

2200 / 3000 2200 / 3000

Next challenge
4000 RPM / 80 kW peak

Peak / cont. current DC [A] 220/120 220/130 /
Torque peak 2 min / cont [Nm] 200 / 120 200 / 130 Useable for direct drived systems
Efficient  % (low / high RPM) 91 - 95 91 - 95 Economy test
HWFET 95 %
Dimensions
diameter / width [mm]
Φ 228 / 86 Φ 228 / 86 /
Star wire resistant  [Ω al 25°C] 0,018 0,018 /
Phase current density  RMS
at 30 kW [Amps/mm2
12 12 Peak 2 min 30 Amps/mm²
Magnetic flux  Axial  Axial  Duble gap 
Temperature sensor
in the motor
kty 81/210 kty 81/210 /
Number of pole pairs 10 10 /
Weight [kg] 11,6 11,9 12 kg EMRAX 4000 RPM

Note: We reserve the right to change technical data.  

*Most producers of similar motors speak about the peak powers, which last a few seconds. We can say that our motors can drive peak power for a few minutes. So this is a very important information. Also we have made many tests with air cooled EMRAX motor on our airplane eaven at 40 kW/1800 RPM which lasted many minutes - take a look at the videos.

 

 

 





EMRAX tests

 

Main Features

  • EMRAX motor-generator is suitable for airplanes, boats, EV, wind and hydropower plants, it can also be used as a step motor.
  • EMRAX is liquid or air cooled. Liquid cooled motor can be combined with air cooled system to get better power duration. Liquid cooling flow (double tube row in stator) is 0,2 l/sec - inlet water 20°C.
  • For air cooled motors the air speed must be 25 m/s at max air temp 20ºC.
  • For EV (direct drive system) and for some similar options the motor needs encoder sensor RLS or resolver Tamagawa TS2620N21E11 (goes perfect with UNITEK controller E-Bamocar-D3). Also the application for a glider plane needs it for stopping the propeller.  It is possible to drive two motors on one shaft, with one or two controllers. Better option is that two motors are driven by two controllers. Anyway two motors can be driven by one controller - in this case the angular degree must be to totaly configured in the right position and also boath motors must operate under the same conditions (cooling).
  • Two motors can be wired serial on one shaft to get doubled torque and up to 120 kW motor power.
  • Motor can also run as sensor less option (boat and airplane application), with encorders RLS or resolver Tamagawa TS2620N21E11 which goes perfect with UNITEK controller E-Bamocar-D3
  • At the moment we can offer controller SAC 41 LC from company Piktronik - it has allready been tested. Also other controllers - Unitek GmbH, Sevcon, Semicron, Elmo are useble, but they have not been tested in our company in all. We have got also some good informations about Unitek and Sevcon controllers suitability for Emrax motors from our customers.
  • The motor and controllers have slope temperature protection. Motor slope temperature protection starts at 100ºC on copper windings and reduces the power to the nominal valuae at 120ºC. The controller has slope temperature protection from 70/85ºC.
  • EMRAX uses 3 phases sin wave commutation. It has no cogging, no vibration. High torque at low RPM can give high power without noise and with the best efficient.
  • Motor can regenerate the electric energy via controller into the batteries - it can be used as a generator.
  • High torque allows the motor to drive systems directly and also improves the motor's efficient.
  • EMRAX motor produces much less noise compared with other BLDC motors.

*We can also design special options of EMRAX motor for lower voltage, for lower RPM in the same housing, which can be modified, for different power, torque. But in this case, the price is higher due to the development.

Mounting options - twin version and propeller version

EMRAX dimensions

emrax_motors_sizes_tn


EMRAX twin carrier (optional)

emrax_twin_carrier_may_2012_tn

EMRAX shaft - flange/hub (optional)

emrax_shaft_flange_may_2012_tn  
Bearings:
Our standard motor has two deep row bearings type FAG 6206 - made for radial forces.
For combine axsial with radial forces (as for propeller aplication)  we can offer the bearing FAG 7206 as it is shown on the top design.

EMRAX Patent

The motors (air and liquid cooled) are patented.
Patent number is: P-201000114





Pricing and buying

Now we are selling the EMRAX motors as prototype motors.
The EMRAX motor price is similar to the same powered brush motors. For the price list please ask us by email:  This e-mail address is being protected from spambots. You need JavaScript enabled to view it  
The price depends on the type and the amount of ordered motors.

How to order ...


Warranty

We give 1 year warranty if our motor is used in accordance with Manual for EMRAX motor.

manual_for_emrax_motor User Manual for EMRAX motor 
file type: PDF, file size: 952 KB
file type:

 

Improvements and modifications:  

October 2011: EMRAX improved LC system - for more informations click here.

September 2011
:

  • EMRAX twin application - for more informations click here.
  • EMRAX motor with resolver application - for more informations click here
December 2010: New EMRAX 3000 RPM at 300 Vdc - for more informations click here


EMRAX motors tested on glider plane Electric Apis EA1

The EMRAX motors have been tested several times on glider plane – Electric Apis EA1. 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 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 - for 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 and retracting the propeller in to the fuselage EA1

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NEW Video: Take off on asphalt running way

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Video: Take off Ferlach, Austria

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Video: Take off, low pass, landing

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Videos

Electric Glider Apis - EA 1 - Future now Electric Glider Apis - EA 1 - Future now Electric Glider Apis - EA 1 - Future now. Take off, Low pass. August 2008.
Electric Apis EA1 powered by EMRAX motor - up to 3000 Ft in 4,5 min Electric Apis EA1 powered by EMRAX motor - up to 3000 Ft in 4,5 min Electric Apis EA1 powered by EMRAX motor - up to 3000 Ft in 4,5 min. February 2010.
Demonstration EA1-EMRAX with prop at 450 RPM AERO 2009 Demonstration EA1-EMRAX with prop at 450 RPM AERO 2009 Demonstration EA1-EMRAX with prop at 450 RPM AERO 2009. April 2009.
Test the electric motor EMRAX 2 on the plane EA1 Test the electric motor EMRAX 2 on the plane EA1 Test the electric motor EMRAX 2 on the plane EA1. December 2009.
The lightest and the most powerfull electric motor in the world