AIRCRAFT PROGRAMMES I BOEING 787 DREAMLINER
power compressors to prepare the cabin air for a comfortable flight experience. In other words, the air conditioning system is operated entirely electrically. The jet engines have very strong generators to ensure adequate power supply. The climate system for the Dreamliner is manufactured by the air conditioning supplier, Hamilton Sundstrand. Such a system supplies enough power to cool or warm 25 private households.
The air that we breathe Motors for aeronautical and space applications differ greatly from standard motors. They have to withstand greater temperatures and vibrations, have a longer life span and have to be very reliable. All in all, 48 motors by Maxon are at work in the climate control system of each Boeing 787. Specific motor modifications were required for the highly complex air conditioning system. This includes drives for the cabin ventilation, for cooling the electronics and for closing and opening the air inlet on the outside of the aircraft. The motors have to withstand
temperatures of -55°C to 85°C and the vibrations during take-off and landing throughout the decades of the aircraft’s service life. Therefore it is vital that the motors have a long life span. The cabin ventilation system consists of 36 shut-off
valves that are driven by Maxon EC 45 flat DC brushless motors. These light brushless motors have been designed to fit into even the smallest spaces. The flat DC brushless motors achieve speeds of up to 20,000rpm and, thanks to their open design, offer excellent heat dissipation at high torques. In the case of the climate control system of Hamilton Sundstrand, the motors achieve a speed of 4,000rpm. In particular the stator of the flat motors installed in the air- conditioning system has been adapted; the printed circuit board has been modified with low temperature Hall sensors and the motor has been given a special protective conformal coating. A modified stator magnetic path prevents movement when the motor is unpowered further improving overall efficiency.
The linear drives for the air inlets use modified EC32 motors, which have also been equipped with low temperature Hall sensors
The linear drives for the air inlets use modified EC32 DC brushless motors which have also been equipped with low- temperature Hall sensors. Furthermore there is a flame barrier at the output shaft of the motor, with special vibration- resistant fastening screw threads and
cogging detent-brake modules. y
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The Boeing 787 Dreamliner’s cabin ventilation system is driven by means of EC flat motors
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