Generating AC

Question 1

Explain the 3 phase AC generator

Answer 1

The most common system found on modern jet aircraft. Consists of three stator windings effected by the same magnetic field. Yellow, red and blue systems separated by 120 degree phase angle. Controlled by a voltage regulator to provide a constant output voltage.

Question 2

Explain a frequency wild generator?

Answer 2

AKA VF generator which produces AC at a frequency dependant on RPM of the generator

Question 3

What component allows generator RPM to remain current regardless of engine RPM?

Answer 3

CSD (Constant Speed Drive) powered by the auxiliary gearbox

Question 4

What is an IDG (Intergrated drive generator)?

Answer 4

Single unit combining bot the generator and CSD

Question 5

What must be done with the CSD (Constant Speed Drive) is oil pressure falls excessively or oil temperature rises excessively and why?

Answer 5

It must be shutdown as it is a hydro mechanical system meaning it could become seized allowing the engine to spin freely.