Aircraft Engines

generators

Introduction
Technically, I would like speak about aircraft generators and engine, because I think than it is very important for the operation inside airplane.
I also want to speak about their operation of the generators and engine as well as their components, and operation ranges.
I think that the generators are the base for the operation of several electric systems, for thatthe generators work with electricity and the electricity is the principle of the systems more complex of our airplane.
the following work was carried out with information based according to the maintenance manuals and operation of the aircraft.
I hope this work serves as great help for anyone that reads it.

d.c generators
energy for the operation of most electrical equipment in an airplanedepends upon the electrical energy supplied by a generator. A generator is any machine which converts mechanical energy into electrical energy by electromagnetic induction. A generator designed to produce alternating--- current energy is called an a.c. generator, or alternator; a generator which produces direct current energy is called a d.c. generator. Both types operate by inducing an a.c. voltagein coils by varying the amount and direction of the magnetic flux cutting through the coils.
For airplanes equipped with direct current electrical systems, the d.c. generator is the regular source of electrical energy. One or more d.c generators, driven by the engine, supply electrical energy for the operation of all units electrical system, as well as energy for charging the battery. The numberof generators used is determined by the power requirement of a particular airplane. In most case, only one generator is driven by each engine, but in some large airplanes, two generators are driven by a single engine. Aircraft equipped with alternating---current systems use electrical energy supplied by a.c. generators, also called alternators.
Theory of operation
In the study ofalternating--.current, basic generator principles were introduced to explain the generation of an a.c. voltage by a coil rotating in a magnetic field. Since this is the basis for all generator operation, it is necessary to review the principles of generation of electrical energy.
When lines of magnetic force are cut by a conductor passing through them, voltage is induced in the conductor. The strength of theinduced voltage is dependent upon the speed of the conductor and the strength of the magnetic field. If the ends of the conductor, a current is induced in the conductor. The conductor and the magnetic field make up an elementary generator. This simple generator is illustrated in the next figure. Together with the components of an external generator circuit which collect and use the energy producedby the simple generator. The loop wire (a and b next figure) is arranged to rotate in magnetic field. When the plane of the loop of wire is parallel to the magnetic lines of force, the voltage induced in the loop causes a current to flow i9n the direction indicated by arrows in the next figure. The voltage induced at this position is maximum, since the wires are cutting the lines of force atright angles and are thus cutting more lines of force per second than in any other position relative to the magnetic field.

As the loop approaches the vertical position shown in figure 9-2, the induced voltage decreases because both sides of the loop (a and B) are approximately parallel to the lines of force and the rate cutting is reduced. When the loop is vertical, no lines of force are cut sincethe wires are momentarily traveling parallel to the magnetic lines of force, and there is no induced voltage. As the rotation of the loop continues, the number of lines force cut increases until the loop has rotated an additional 90° to a horizontal plane. As shown in figure 9-3,

the number of force cut and the induced voltage once again are maximum. The direction of cutting, however, is in...