Giovanni fcb
giovanni fcb

Impedances

From the relations previously known we can have a relation between the impedance of the primary Zp and the impedance of the load Zc. In this way, it is possible to work the impedances by changing the turns ratio. The relationship between the modules of the induced voltages in the primary and the secondary is identical to the relation between the number of corresponding windings.

In transformers the power must always remain the same and the incoming power must be the same as it leaves, disregarding the loss. The maximum power approved by the source is only transferred to the load if it has an impedance identical to the internal impedance of the source. Just look at the example of how to use the transformer to solve problems of low power in the load.

Electrical insulation means the lack of direct physical connection between circuits and an example of transformer application for electrical insulation is in voltage measurement on a high voltage line. The measurement can be performed smoothly by the technician using a transformer in the original line design that lowers the voltage to a protected level for technical and from which we can get the original tension applying the turns ratio should be known.

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Synchronous Generator – Operation

In the case of acting as a generator, the mechanical energy will be provided to the electric motor by the application of a torque and by the rotation of the shaft or shaft thereof. Once the generator is properly connected to the mains, the voltage to its terminals will be solved by the frequency of rotation and by the number of poles, the frequency of the three-phase voltage of the machine.

In order for the synchronous machine to transform the mechanical energy applied to its axis or shaft, it is necessary that the field winding located in the machine rotor be fed properly by a source of continuous voltage so that, in making the rotation, the magnetic field produced by the rotor poles has a relative movement to the conductors of the stator windings.

Due to the relative movement between the magnetic field of the rotor poles, the intensity of the magnetic field that circulates through the stator windings can change in time, that is, considering Faraday’s law, there is an induction of voltage to the terminals of the stator windings .     ZD18H575-EO

Thus, because of the form of distribution and space accommodation of the set of windings of the stator, the voltages induced at its terminals can be alternated three-phase sinusoidal.

 

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Shaded Pole Motors

The distorted field electric motor provides a single direction of rotation and normally this field can be reversed in case of changing the position of the rotor shaft tip compared to the stator. There are several ways in which to achieve the rotation reversal.

The induced current in the loop has as its function to cause the flow through it to undergo a reactive delay with respect to the flow of the part not invaded. This process derives from a rotating field capable of moving in the direction of the unincluded part to the part of the pole involved, thus producing the nominal rotation torque.

Regarding the behavior, the distorted field motors offer low starting torque, low power and efficiency. The shaded pole motor, also called as a distorted field motor, because of its starting process, is considered the most economical and simple of single-phase induction motors.

They can be found in different categories, considering that one of the most common types presented is that of outgoing poles. Each of these poles has a part, which can change from an average of 25% to 35% of it, surrounded by a short copper circuit.

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