Aircraft air conditioning system including electric generator fo

Details Aircraft air conditioning system including electric generator fo Aircraft air conditioning system including electric generator fo

1998-02-11

2000-09-26

Ponomarenko, Nicholas

Prime-mover dynamo plants

Turbogenerators

60 3601, F02C 300

Patent

active

061246468

ABSTRACT:
An air conditioning system for an aircraft includes cascaded high and low pressure turbines, an electric generator that is driven at variable speeds by the low pressure turbine, and a fan that is also driven by the low pressure turbine. During operation of the air conditioning system, ac power is generated by the electric generator and provided to electrical equipment onboard the aircraft. Because the electric generator is driven at variable speeds, it generates ac power having variable frequency. The air conditioning system further includes a bypass valve for bypassing the high pressure turbine when speed of the electric generator approaches a lower limit. Bypassing the high pressure turbine allows generator speed to be increased. The fan has a speed-cubed load characteristic that maintains the generator speed below an upper limit. Thus, the bypass valve and the fan can be used to limit the speed of the electric generator and thereby maintain frequency of the ac power between upper and lower limits.

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