# Electrical motors and mauinas

Classified in Other subjects

Written at on English with a size of 7.09 KB.

 Tweet
Change of polarity: "To change the direction of the poles in a generator is done by changing the direction of rotation of the generator, changing the two poles with two contactors or permuting the rotor, this applies both in series, parallel or loose excitation , being the latter case the best way to do it.
DC machines, "Basic Principle of generation of electric power, which is having a field line, we generated a movement and create a current. This current is generated when alternal field lines in the coil.
With two magnets, so the current is in its highest point, we need to estubieron perpendicular to the field. After turning the power comes practicamene to "0" when this parallel to the field. If in addition to turn back but the current would turn around and would become negative. Finally, the current would be in its current maximum point would be in his point of maximum negative current to the total speech around.

Excitation of the inductors: magnetic field necessary for a can function derived in 2 ways: using a permanent magnet or electromagnet powered by DC.
Rectification of current collector thin by a dynamo: Starting from a single ring, putting the brushes, making the current in the same direction, when increasing the number of thin flow becomes more often and seems more the current (ripple current).
In a DC generator can do several things. The generators have 4 two in the rotor windings and two stator

Both sides can work alone, in series, parallel or compound that coje half of one winding and the other and put it in series over and over in parallel.

Synchronous machines - Energy Conversion Devices electromecanicas.Convierten mecanica.Su speed electric power depends directly on the grid frequency.
Types of synchronous machines, "is composed of a rotor (moving part of motor) and stator (fixed part of the engine) Roto .- r:-Located inside the stator and consists of a mesh of steel plates forming a cylinder integral with the motor shaft. Stator: "Made up of a casing in which it set a crown of steel plate provided with slots.
Salient pole alternators: "They cause a flow of magnetized iron mass, creating in his extremities poles alternators correspondientes.En these magnetic circuit is completed with another party called metal armor that is equipped with slots into which is housed the second circuit Electric.
Alternators smooth poles "is formed by areas which flow out from the cylinder head (north) or enters it go after the armor (South)
Alternators 4 poles: "Over the 4 arms of the rotor windings are two separate coil current, N turns each, connected in series so that the orientation of the 2 windings of each rung is opuesta.Cuando starts the machine, intensity is circulated continuously on the rotor that makes opposing aparexcan 2 poles N and S 2 poles apart.

Synchronous motors, "This type of machine the speed is constant and depends on the frequency that apply, the number of pole pairs, knowing this sincronismo.Este highest speed and highest speed of engine types are very useful in automation. Xk used for that very reason the speed is the same. To describe this phenomenon we have to define some variables n is the speed measured in rpm, f is frequency, p the number of pole pairs. With what we have left the formula of sigiente way.
Asynchronous machines: - In these machines the stator runs at the speed of the rotor bira sync but at a different speed of the stator magnetic field. In this variation of speed is called slip. The speed of these machines is therefore slightly different from that of synchronism. With increasing engine load varies asynchronous aumeta slippage and power consumption. We also measured the sliding percentage.
Single-phase motors: "It is not easy to start the spin, so, you have to use some auxiliary element.
Types of Induction:. De-split: You have 2 very different windings, a main winding and auxiliary winding auxiliar.El other winding is what causes engine start, so, it has a two-step at the time of arranque.Dispone a squirrel-cage rotor as used in three phase motors.With capacitor: "They have 2 windings, one assistant and one auxiliary winding principal.Sobre placing a capacitor in series. With coil shorted" No auxiliary winding is instead a loop is placed around one of the polares.La mass velocity on the number of poles that have the motor.El couple of starts is much lower with respect to a split-phase motor, about 60%.
Types Collector:
Universal:-type
motor can be powered with AC or CC.Los stator windings and rotor are connected in a series THROUGH escobillas.El torque is situated in 2 or 3 times the normal pair . The rate varies depending the load.
Types Step by Step: Hybrids: "Operation is based on the combination of 2 other types of stepper motors, the variable reluctance motor and the motor of permanent magnetization.
Synchronous machine operation.
The operating principle of these machines is the same as that of synchronous motors, based on the same variables. Basing its operations on the interaction of fields with variable currents.
Types of machines

The electric machines are classified into three groups: generators, motors and transformers.
Transformed generators mechanical energy into electricity, motors and transformers backwards retains the same type of energy but transforms its characters.
From a mechanistic vision machines can be classified in rotating and static. Rotaries are the generators, motors and alternators. And the transformers static.
In rotary machines to and a fixed phone call and another call stator rotor.