User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 46
- Liquid flow must be filtered through the filter which openings’ diameter or diagonal must not exceed 2 mm.
- We recommend original coolant fittings, which have a special O sealing ring. If the tubes are sealed with some
other sealing material, we do not guarantee that the system is waterproof.
- We do not recommend cooling the motor with salt water, because long-term exposure of the motor cooling
system might lead to mineral deposits. Therefore we recommend a heat exchanger. Motors were not tested in
a salt environment and cooled with salt water.
IP65 motor:
o EMRAX Liquid Cooled LC (liquid cooled):
This motor is totally closed. Liquid cooling flow must be 6 to 8 litres per minute at maximal 50 °C inlet
water/glycol temperature and ambient air temperature has to be 25°C or less. Inlet water/glycol temperature
and ambient temperature can also be lower – in this case the continuous motor power is higher. This is valid
for all EMRAX motor sizes.
To achieve good inlet water/glycol flow rate the recommended (from 6 to 8 l/min) inlet pressure for the
different motor types must be:
!Note:
- Maximum inlet water/glycol flow pressure must not exceed 2 bars.
- Inlet water flow pressures are valid if the tube length between the motor coolant fittings and the pump is up
to 2 meters (diameter is 12 mm). If the tube is longer higher pressure in accordance with the pressure drop
must be used.
- Even though the motor is liquid cooled only the ambient temperature is an important factor for achieving
high constant power. The ambient temperature must be 25°C or less (as described in Technical Data Tables).
- The motor must not be closed into some box without the possibility of exchanging air.
- Liquid flow must be filtered through the filter which openings’ diameter or diagonal must not exceed 2 mm.
- We recommend original coolant fittings, which have a special O sealing ring. If the tubes are sealed with some
other sealing material, we do not guarantee that the system is waterproof.
- We do not recommend cooling the motor with salt water, because long-term exposure of the motor cooling
system might lead to mineral deposits. Therefore we recommend a heat exchanger. Motors were not tested in
a salt environment and cooled with salt water.
15. EMRAX motor materials, quality and reliability
EMRAX motors are quality made and consist of quality advanced materials. Materials are able to withstand extremely high
power / torque (high temperature resistant, shatterproof, stiff) and are corrosion resistant.
Stator part, outer ring, front and rear disk are made of aluminium quality 6082. Minimum aluminium thickness is 3.0 mm which
is on the outer ring. The outer ring, front and rear aluminium disk are anodized in black.
Even though rotors with magnets represent approximately 40% of the motor weight, the direction of motor rotation can be
changed in a fraction of a second. This is possible due to a very high quality motor shaft, which is made from hardened steel
(42CrMo4) and quality bearings, which are chosen for long time duration.
Stator with cooper windings has an additional epoxy coating.
Magnets have a UH grade 180°, which means they are resistant up to 180°C. They are chemically and mechanically fixed to
perfection, therefore EMRAX motors are very reliable. EMRAX motors are sold to the airplane industry where reliability is
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