AEIS CHAPTER 2 Flashcards by crash theporsche

What is a generator

electromagnetic device that converts mechanical energy to electrical energy by electromagnetic induction

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how are DC batteries used in aircrafts

used for emergency/standby purposes only

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an aircraft dc generator is the i) of power and is also used to maintain the ii)

main source, aircraft battery at its fully charged condition

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Aircraft DC generator is used for

normal operation

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i) of armature affects the voltage produced by a generator

speed

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i) of ii) field affects the voltage produced by a generator

strength, magnetic

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number if i) affects the voltage produced by a generator

conductors connected in series with the armature

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DC generator is made up of a i) and ii)

stator, rotor(shaft)

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the stator in a DC generator is i)

stationary

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the rotor(shaft) in a DC generator is i)

moving/turning

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the magnetic frame(yoke) in the stator provides i) for the poles

mechanical support

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the magnetic frame(yoke) in the stator acts i) for the machine

protecting cover

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the magnetic frame(yoke) in the stator provides i) for flux produced

a path

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the poles in the stator is made of i)

silicon steel plates (laminations) riveted together

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the poles in the stator provides a i) for the magnetic flux

low resistance path

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the poles in the stator provides i) for the field coils

support

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the field coils in the stator produces i)

magnetic flux

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the brushes and bearings in the stator is made of i)

carbon and copper alloy

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the brushes and bearings collect i) from the ii) and delivers it to the iii)

current, commutator segments, external load circuit

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the armature core in the rotor consists of i)

steel laminations insulated from each other

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the armature core in the rotor provides a i) for the magnetic flux

low reluctance path

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the armature windings in the rotor generates i) if the machines is a generator

EMF

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the armature windings in the rotor allows the i) and develops a ii) if the machine is a motor

flow of current, force

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the commutator in the rotor facilitates the i) from the ii)

collection of current, armature conductors

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the commutator in the rotor rectifies the i) to ii) in the external load circuit

AC current to DC current

a series DC generator is a i) generator in which the field winding is in ii) with the armature winding

self-excited, series

a shunt DC generator is a i) generator in which the field winding is in ii) with the armature winding

self-excited, parallel

a compound DC generator is a i) generator in which the field winding is a ii)

self-excited, combination of series and shunt wound generators

a seperately-excited DC generator is a i) generator in which the field winding and armature are

seperately-excited, seperated

the two methods of winding the armature conductors are

wave winding and lap winding

wave winding is also known as i)

2 circuit winding/series winding

lap winding is also known as i)

multiple circuit winding/parallel winding

in wave winding, the windings i) overlap

do not

in lap winding, the windings i) overlap

in wave winding, the number of parallel paths is i) regardless of ii)

two, number of poles

in lap winding, the number of parallel paths is i) the number of poles

the same as

series windings produce i)

high voltage, low current generators

wave windings produce i)

high current, low voltage generators

in wave windings, each path supplies i)

the total current output

in wave windings, i) are neccesary

2 sets of brushes

in lap winding, the total current output divides i)

equally among the paths

in lap winding, there are as many i)

sets of brushes as the machine has poles\

formula for the EMF generated for a Wave-wound armature

insert image

formula for the EMF generated for a Lap-wound armature

insert image

voltage regulators is used to control i)

the strength of the field

voltage regulators is used to maintain a i) from the generator under ii)

a constant voltage, all conditions of speed and load

the three types of voltage regulators are

carbon-pile voltage regulator, variable resistor voltage regulator, solid-state voltage regulator

the reverse-current cut out relay prevents the i) when ii), preventing the iii)

battery from discharging through the generator, Vgen < Vbatt, armature from burning

the current limiter protects i)

the generator from excessive loads

what is a GCU

Generator Control Unit

a GCU consists of i), ii) and iii) from left to right according to the circuitry

Voltage regulator, current limited, reverse-current cut out relay

what are the basic equipment to monitor DC power onboard aircraft

ammeter and voltmeter

when designing aircraft electrical power distribution system, power consuming equipment must not be i) in the event of ii) unless iii)

deprived of power, power source failures, total power demand exceeds available supply

when designing aircraft electrical power distribution system, i) on the distribution system must have a ii)

faults, minimum effect on system

when designing aircraft electrical power distribution system, i) faults must not ii) to other equipment

power consuming equipment, endanger the supply of power

one of the advantages of paralleling genrators is that there will be i) if a generator fails

no break in supply

one of the advantages of paralleling genrators is that the system can handle i) and ii) to improve iii)

high transient loads, share the loads equally, life expectancy

one of the disadvantages of paralleling generators is that it requires i) and ii)

additional circuitry, it complicates the system

the Hot battery bus is for i) and is connected ii)

vital / critical services, directly to the battery

the main bus is for i) and can be supplied from ii)

essential services, from a generator or batteries

the avionics bus is for i) and is supplied from a ii)

non essential services, generator

DC motors have i) arrangements unlike AC motors

commutator

DC motors do not depend on i) for speed control and are more suited for ii)

input frequency, fast-changing speed applications

DC Generator turns the i) to outpur ii)

armature, DC voltage

DC Motor inputs i), making the ii) and outputs iii)

DC power, armature rotate, torque

In a series wound motor, the field windings and armature are i)

connected in series

a series wound motor has a high i) and good ii)

starting torque, acceleration

a series wound motor can never run i)

without a load

a series wound motor can be started on a i)

full load

In a shunt wound motor, the field windings and armature are i)

connected in parallel

a shunt wound motor has a i) characteristic

constant-speed

in a shunt wound motor, the i) is proportional to ii)

torque proportional to armature current

a shunt wound motor must be started on a i) or ii)

light, no load

a compound wound motor has i) and i) in speed

good starting torque, good stability

a compount wound motor provides the benefits of i)

series and shunt wound motors

a starter generator initially operates as a i) to ii). subsequently, it will start to act as a iii)

DC motor, crank the engine, generator

using a starter generator helps to save i) by replacing individual members

size and weight

one disadvantage of using a starter generator is that the generator output is i) to maintain at ii)

difficult, low engine rpm

starter generators are usually used on i) aircraft that maintains a ii)

turbine powered, relatively high engine rpm