User’s Manual for Advanced Axial Flux Synchronous Motors and Generators
www.emrax.com Version 4.5 / January 2017 45
Figure 42: Motor coolant fittings for one motor
EMRAX motors have to be used under ambient and motor cooling conditions, which are described in the Technical Data
Tables. Failure to comply with these conditions will void the warranty. .
The EMRAX motor must not exceed the temperature below -30°C and above 120°C on cooper windings and on the
magnets. These values are also valid for the bearings. If the temperature exceeds these values, it causes a void of
warranty. The indicator for exceeded temperature is placed in the motor. In case of disconnection of the temperature
sensor, which has to be on the cooper windings, the controller has to stop the motor. The motor temperature sensor
detector in the controller must always be enabled, during motor operation. The temperature sensor in the motor only
measures the temperature of the stator, not the temperature of the magnets, consequently the magnets’
temperature (outer/surface temperature of the motor) has to be measured with the thermal camera. It must be
considered that the surface temperature is lower compared to the magnet temperature – difference is approximately
10-20 °C (depends on the load).
IP21 motor:
o EMRAX Air Cooled AC (air cooled):
Fresh air has to be served to the drive symmetrically and sufficiently. Air speed must be 20 m/s at maximal
25°C air temperature and at maximal 200 kPa pressure. This has to be ensured by intake ports or other air
conduction measures. The motor can be protected with some net against the dirt.
o EMRAX Combined Cooled CC (air and liquid cooled):
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 a good inlet water/glycol flow rate which is recommended (from 6 to 8 l/min) the inlet pressure for
the different motor types must be:
!Note:
- Maximum inlet water/glycol flow pressure must not exceed 2 bars.
- Inlet water/glycol 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.
- For the combined cooled motor it is important that beside liquid cooling also air cooling is assured – this
means that the air around the motor must be exchanged (air circulation) and that the ambient air temperature
must be 25°C or less (as described in the Technical Data Tables) to achieve the best motor performance.
- The motor must not be closed into some box without possibility of exchanging air. Liquid cooling is important
for the stator, air cooling is important for the rotor. The motor can be protected with some net against the dirt.
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