Lesson 6 Review Flashcards
“The RATE at which the MAGNETIC lines of FLUX are CUT” describes what?
Generator output/ amount of CURRENT produced
What affects the RATE the lines of FLUX are cut?
- Armature rotation speed
- Armature windings
- # of Flux lines
Where does the current for the field windings come from?
Generator output
How do Voltage Regulators work?
All control is done through the FIELD
Control the FIELD, control the OUTPUT
Adjusting the RHEOSTAT will control the field current for this type of regulator
MANUAL Regulation
What is specific to the VIBRATOR type Voltage Regulator?
Voltage Coil
Contact Points
Adjustment Spring
Field current is controlled by the resistance of the CARBON pile on this type of regulator
Carbon Pile Voltage Reg.
Solid State Voltage Regulators use what?
Transistorized VR
Describe DC Generator Paralleling
Multiple power sources power busses
VR adjusted so both GEN. provide EQUAL amount of current to bus
This type of paralleling must have their FREQ. and PHASES aligned
AC Generator Paralleling
What will prevent the battery from discharging through a failed generator?
REVERSE CURRENT RELAY will isolate the GEN from the bus
How does a REVERSE CURRENT RELAY work?
When GEN voltage DROPS, direction of current in the current coil REVERSES = weakened combine fields = OPEN contact points = GEN iso from bus
This component prevents the GEN from delivering high current loads that causes damage and heat
CURRENT LIMITER
How does the CURRENT LIMITER work?
HIGH current through current limiter COIL = mag field around the coil OPENS contacts = REMOVE field current = GEN output drop
The point where the BRUSHES make contact with the COMMUTATOR where no current is being induced in the WINDING is called?
NEUTRAL PLANE (winding PARALLEL to field)
Aircraft Generator have which major components?
Armature Assmebly
Field Frame Assembly
Brush Assmebly
End Frames
Difference between DC GEN and DC ALT?
GSM
ARM
This component consists of Wire coils and laminated soft iron. As the ARMATURE assembly rotates within the MAG field CURRENT is induced in the WINDING
Armature Assembly
What do we inspect on brushes and commutators?
Wear/Tear for Brush condition
Spring Tension
What do BEARINGS do?
Allows the SHAFT to rotate freely with min. friction
For Belts and Drives M2 use what? What about M1?
M2: SPLINE SHAFT via gearbox/CSD
M1: BELT DRIVE
What do we look for during BELT maintenance?
CONDITION (crack, oil, glaze, torn)
TENSION (reduced output, excessive = bearing strain)
ALIGNMENT (bearing failure)
If SLIP RINGS are used to deliver ARMATURE current to the brushes, what is the component?
AC GENERATOR
DC GENERATORS use what to deliver ARMATURE current to the brushes?
COMMUTATOR RING
