Wound motor part

Wound motor part gy uirucs ,qexaúpR 04, 2010 4 pagos Motor-Generator characterisation This is the part most important in the wind mill because the turbine converts the mechanical energy into electrical energy. Wind turbine generators are somewhat unusual when compared With other generating units that usually are connected to the mains. One reason is that the generator should work with a power source (the wind turbine rotor) which supplies very fluctuating mechanical power (torque).

The most typical turbine used for generate electrical power is a electrical engine, also called an induction generator or three- hase asynchronous electrical engine to generate al ternative current, first time this generator was designed to work as a motor and used for drivin machine in factories, pumps, fans, compressors and Oth where we need to ora Sw p to page transform electrical e rgy.. was also chosen fort ir rer expensive. The gener make it useful for wi overload capability. ergy. The industry ally not very properties that or slip and a certain In this picture, we can see the diferent parts of the induction machine that is the same same for the wound rotor motor. Differences between Cage rotor and wound rotor induction motor re the

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next: Cage rotor (squirrel Cage): it consist of a series of conductor bars laid into slots curved in the face of the rotor and shorted at either end by large shorting rings.

This design is referred to as a Cage rotor the conductor, if examined by themselves would look like one ofthe exercise wheels that squirrels or hamsters run on. Wound rotor: it has a complete set of three-phase winding that are mirror images of the winding on the stator. The three-phase of the rotor are usually Y-connected, and the ends of the three rotor wires are tied to slip rings on the rotor’s shaft. The rotor winding are shorted through brushes riding on the slip rings.

Wound-rotor induction motors therefore have their rotor current accessible at the stator brushes, where they can be examined and where extra resistance can be inserted into the rotor circuit. Its possible to take advantage of this feature to modify the torque- Speed characteristic of the motor. Wound rotor induction motors are more expensive than Cage motors and they require much more maintenance because of the wear associated with these brushes and slip rings.

As a result, wound-rotor induction motors ssociated with these brushes and slip rings. As a result, wound- rotor induction motors are rarely used. Components Wound rotor: This part is explain above in the previous section, but we put a picture for to see the differences with the previous rotor Stator: The stator is a piece of the motor and inside is composed of the coils on the magnetic core that it generate a magnetic field also calls inducing coils ,the typical parts of the stator are the armature, the brushes and the bearing. t consists of a Steel frame enclosing a hollow cylindrical core (made up of laminations of silicon Steel). The laminations are to reduce hysteresis and eddy current losses. I Brush: In electricity, it is often necessary to establish an electrical connection between a fixed and a rotating part on a device. ThlS is the case of electric motors and generators, where you have to establish a connection to the fixed part of the machine with the rotor windings.

To make this connection are fixed in the axis three rings, usually copper, electrically insulated from the shaft and connected to the rotating coil terminals. In front of the rings are arranged carbon blocks, by springs, put pressure on them by establishing the ecess 3Lvf4 of the rings are arranged carbon blocks, by springs, put pressure on them by establishing the necessary electrical contact. These blocks of carbon are known as brushes and rotary rings are called conector.

I Carbon brushes are maintained by brush-holders to be in permanent contact with the slip ring assembly. Electrical slips rings: the Electrical slip rings are used everywhere where electrical currents are transmitted from a rotating shaft part to a static machine part. The transfer of energy between the rotor and stator occurs by way of a slide contact, which is pressed gainst the rotating slip ring by a precision spring with constant pressure.

It is important to select the optimal pair of materials for the contacts, in arder to ensure reliable functioning and a long product life. Terminal box: wound rotor motor is special in this case because apart from having the classic terminal box with 6 terminal, where we can make connections typical of star and triangle, this also has an output generator in case of as we use it, have access to the slip rings, using brushes, these rings rotate With the shaft of the rotor, and so we can get electric power generation.