Adequate Ventilation of Electric Motors

In electric motors with self-ventilating devices, the cooling air is generated by a fan, which may be internal or external and which is driven by the motor shaft. The airflow will carry with it all the dust and light elements that, with their accumulation, result in the obstruction of the existing openings or channels, preventing the passage of air and the normal dispersion of heat, a factor that can generate a considerable increase of Motor heating.

However, it is common to find in the industry motors installed in small spaces that can limit air circulation, thus causing unnecessary overheating. In the case of motors that depend on external forced ventilation, stopping the motorcycle fan assembly may cause the same problems.

Therefore, to ensure the proper functioning of the installations, certain precautions must be taken, such as carefully cleaning the ventilation holes, cleaning the fins, removing dust and fibrous materials, ensuring that the installation site of the engine allows air circulation, checking The operation of the auxiliary ventilation system and the free circulation of air in the ventilation ducts.

Starting Process

The so-called induction electric motors require the use of the cage type rotor, which must have a special device for the moment of starting. This particular device is based on a specific type of starting winding, which is usually added to the stator.

Thus, single-phase motors, due to the fact that they only have a single power phase, do not have the possibility of having a rotating field, as in multi-phase motors, but in turn, they have a pulsating magnetic field.

In turn, this factor will be sufficient to prevent them from being able to conjugate to the start, since in the rotor magnetic fields will be induced aligned in relation to the stator field.

In order to solve this problem of starting, windings considered as auxiliary are used, which has the possibility of being dimensioned and positioned in a way that creates a second fictitious phase, allowing in turn, the formation of the rotating field necessary for starting.

There are five types of single-phase induction motors with cage rotor, which are classified according to the starting auxiliary arrangement employed, are the split-phase electric motor, starting capacitor motor, permanent capacitor motor, motor with two Capacitors and distorted field motor, also known as shaded poles.

DC Motor and AC Motor

A DC motor is an electric motor that is powered by direct current (AC), and this power can come from a battery or any other DC power. Its switching (energy exchange between rotor and stator) can be through brushes (brushless) or brushless. In a dc motor, the speed can be controlled only by varying its voltage, unlike an alternating current (AC) electric motor whose speed is varied by frequency.

AC electric motors therefore require a change in frequency if it is necessary to vary their speed, thus involving a more complex and expensive speed control. On the other hand, as the cc engine when varying speed only needs a change in voltage level, it becomes more suitable for 12 Vdc-powered equipment such as automobiles, or industrial applications that require fine speed control.

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In order to facilitate the selection process of DC and AC electric motors, it is essential that the main performance specifications, as well as power and size requirements, are identified. It is also important to consider the environmental requirements for your application.