circuit protection squared 2018

Induction Elements

Induction electric motors have a relatively static magnetic circuit, which is properly formed by ferromagnetic plates that are stacked and correctly insulated from each other (called a stator) and by coils, which are inserted into open cavity species in the stator, being fed by the alternating current network.

It is worth mentioning that the rotor must be anchored in a kind of shaft, whose main function is to transmit to the load, all the mechanical energy caused. The asynchronous electric motor is composed of important elements. The air gap, which relates to the distance between the rotor and the stator, is considerably reduced, in a manner capable of reducing the no-load current and hence the losses, but also so that the increase in the power factor at vacuum can be achieved.

In order to elucidate, we can consider the projection of the different elements of the asynchronous rotor motor in a squirrel cage. There is also a rotor which is composed of a ferromagnetic core, also laminated, on which a winding or a set of parallel conductors can be found, where currents commonly caused by the alternating current of the stator coils are induced.

Application For Engines

We can say that among the main categories of electric motors of alternating current, we must emphasize the synchronous motor, since it is perfectly capable of operating with a fixed speed, having its use only for large powers, since they present a very high cost for sizes, or if you need to achieve an invariable speed.

Nowadays it is plausible to control the speed of the induction motors with the help of frequency inverters. DC motors cost more and necessarily require a specific direct current source or an element that is capable of converting ordinary alternating current to continuous.

This type of engine operates with speed expressively adjustable between wide limits, having controls of great precision and flexibility. In this way, its application is only indicated in specific cases in which some factors can compensate the higher cost of the installation.

Induction motors can run at a steady speed, which can change with the mechanical load applied to the shaft. Because of its great simplicity, strength and low cost are considered as the best selling motors of all, making it suitable for almost all types of driven engines.

Different Electric Machines

It is necessary to observe the main types of electric motors that can be found in industries and factories, and should be emphasized those of direct current, which has a relatively higher cost, considering that for efficient efficiency, they need a DC source, or a component capable of converting common alternating current into continuous. They can operate with adjustable speed between wide limits with controls of great flexibility and high precision. Electric motors are machines that have the main function of transforming electrical energy into mechanical energy.

The induction-operated components are the most commercially-available type of engine, combining the conveniences of electric power usage, reduced cost, easy transportation, cleanliness and simplicity of control with its simplified construction, low cost and great versatility of adapting to the loads of different types, having the best yields always. Its use becomes reserved for cases considered exceptional, where some operating requirements can balance the higher cost of the installation process. AC motors are the most commonly used, since the distribution of electric power is carried out in alternating current and the main types are the synchronous motors and the induction motors.

Poles and Magnetic Flux

Each magnet has two poles, one being a north pole and one south pole. In this way, the invisible lines of the magnetic flux will start from the north pole towards the south pole. Even if the flow lines are invisible, the effects of the magnetic field produced by them may become visible.

If a sheet of paper is placed on a natural magnet or on an electromagnet, and an iron filament is spilled on this sheet, the iron filings will be arranged along the invisible lines of the flow. Dashed lines will indicate the path of magnetic flux lines. The field lines remain in and out of the magnet, thus forming closed loops. The magnetic flux lines will exit the north pole and enter the south pole, returning to the north pole through the magnet.

The instant that two magnets are placed next to each other, the magnetic flux that exists in the surroundings of the magnet, can cause a significant interaction between them. If, by chance, the magnets come in with the opposing poles, they may have the attraction phenomenon, and if they have the identical poles, they will need to repel.

The Magnetism

The foundations of the phenomena that cover magnetism are in invisible lines of forces produced by natural magnets, just as happens through the electromagnets. It is worth noting that among the three found types of most common natural magnets, one should emphasize the horseshoe, the magnetic bar and the compass needle.

These magnets have two main characteristics, they have the ability to attract and cling to the iron, and when they are free to move, as in the case of the compass needle, they point to the north and south poles.

When we talk about electricity, we can understand that the opposing poles have the capacity to attract, considering that all bodies that are charged from the electrical point of view must have a field impossible to be seen around them. If two bodies are loaded with exactly equal charges and put together, their electric fields will try to repel them, and in case the two bodies charged with opposing charges are put together, their electric fields will act to attract them.

The electric field discovered in the surroundings of a charged body may be correctly represented by invisible lines of force representing an invisible electric field that generates attraction and repulsion.