Variable Frequency Electrical Generating Systems for Aircraft: A discussion of the advantages and disadvantages of variable frequency main generators for aircraft and possible research areas

Abstract

THE term ‘mixed frequency generation’ is of American origin and refers to an electrical generating system for an aircraft where the main generators are directly coupled to the engines and deliver a variable frequency over the engine speed range. A part of the generator output is used directly for such loads as de‐icing and galley loads which are not at all frequency sensitive. Other loads which require a constant frequency of supply (generally 400 Hz.) are supplied by rotary or solid state inverters (called ‘converters’ in the U.S.A.). Direct current loads (generally 28 V.) are obtained from transformer rectifier units.

Citation

Burns, D.O. (1970), "Variable Frequency Electrical Generating Systems for Aircraft: A discussion of the advantages and disadvantages of variable frequency main generators for aircraft and possible research areas", Aircraft Engineering and Aerospace Technology, Vol. 42 No. 11, pp. 6-10. https://doi.org/10.1108/eb034691