IDG - Interface Accessories
Figure 005
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 24-21-00Page 11 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1
R IDG - Interface Accessories
R Figure 005A (SHEET 1)
R 1EFF : 401-499, 1 24-21-00 Page 12
1 1 Aug 01/05
1 1
1CES 1
R IDG - Interface Accessories
R Figure 005A (SHEET 2)
R 1EFF : 401-499, 1 24-21-00 Page 13
1 1 Aug 01/05
1 1
1CES 1
B. Quick Attach Detach (QAD) Adapter
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 003)
R **ON A/C 401-499,
R (Ref. Fig. 003A)
R **ON A/C ALL
The IDG is installed on the engine gearbox pad. It is attached by means of QAD device with a tension bolt.
C. Drive The speed conversion components consist of the gear differential and the hydraulic trim unit. The variable speed shaft power is provided by the engine gearbox to the IDG input shaft which is directly coupled to the carrier shaft of the differential. The variable displacement hydraulic unit is driven by the carrier shaft at a direct ratio of input speed. The variable displacement hydraulic unit is hydraulically coupled to a fixed displacement hydraulic unit which is mechanically coupled to the trim ring gear of the differential. The speed and direction of rotation of the fixed displacement hydraulic unit and hence the trim ring gear is regulated by an electronic controlled servo valve. The servo valve ports oil to a control piston to position the variable wobbler and control the rate and direction of oil flow from the variable to fixed hydraulic units. Speed summing is accomplished in the differential by adding or subtracting the trim speed of the trim ring gear to the meshing planet gear which is orbited as a function of input speed by the carrier shaft. The second or output planet is in mesh with the first planet and the output ring gear. The output gear is thereby made to rotate at a constant speed. Since the output ring gear is meshed with the generator drive gear, constant shaft speed (24,000 rpm) is converted directly into 400 Hz constant frequency AC power which is available at the IDG power terminals.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
D. Generator
The generator is a three stage assembly which includes three machines
connected in cascade.
The first machine (Pilot Exciter (PE)) is a twelve pole Permanent Magnet
Generator (PMG).
Its rotor is constructed of small Rare Earth Cobalt magnets. The output
from the PE stator winding:
- has a generator excitation function,
- provides power for other components of the electrical system which
comprises the generator (supply of the GCU, EGIU, and the external
relays and contactors). The generator is thus "self-flashing" and
"self-sufficient".
R **ON A/C 401-499,
R D. Generator
R The generator is a three stage machine with the three component machines
R connected in cascade.
R The first machine (pilot exciter (PE)) is a twelve pole permanent magnet
R generator (PMG).
R Its rotor is constructed of small Rare Earth Cobalt magnets. The output
R from the PE stator winding :
R - has a generator excitation function
R - provides power for other components of the electrical system of which
R the generator forms part (supply of the GCU and the external relays and
R contactors). The generator gets thus "Self-flashing" and
R "Self-sufficient".
R **ON A/C ALL
The second machine (Main Exciter (ME)), 10 poles stator, receives its
field excitation from the pilot exciter via the voltage regulator in the
GCU: this creates a stationary field. Rotating diodes rectify the three
phase output of the main exciter rotor.
This output feeds the main rotor winding.
The DC output thus produced supplies the rotating field system of the
third machine.
The third machine (main alternator) receives excitation for the rotating
salient four pole field from the rectified output of the main exciter.
The main alternator has a three-phase star-connected stator-winding. The
three phases and neutral are taken to the generator output terminal
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