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Sunday 27 November 2016

Automatic Winding Machine - Stator Winding Machine

automatic-stator-winding-machine

Stator is the important part of rotary system which you can mainly find in electric motors, generators, biological rotors or sirens. The main purpose of using stator is to keep the field aligned. The stator may act in a different way as per the configuration of a spinning electromotive device like field magnet or interacting with armature to create the motion or may be for receiving influence from moving field coils on the rotor.
The maximum value of flux density in the air gap has some limitation which controlled by the magnetic saturation in the stator and rotor iron and it is typically around one tesla. Large synchronous generators are designed in such a way so that it could bear the terminal voltage of several thousand volts. Each stator coil for the stator winding machine usually consists of a number of same types of coils placed in sequential manner in slots on the stator surface and also connected in series.
The voltages which are induced in individual coils in the distributed winding are sometimes displaced in time from each other. Thus, the result comes out with the maximum winding is less than the voltage per coil multiplied the number of coils. However, the waveform on the automatic stator winding machine is still the form of approximately like sine. The winding spans of the stator are mainly each of 60 degree. So, to make use of the whole periphery of stator surface, two other same types of windings need to be inserted so that the voltage induced into the winding should be equal in peak magnitude to the windings of 60 degree arcs, but would be delayed in time by approximately one third of the cycle. This is the three phase system of stator winding machine and the waveforms for the three phase stator winding machines will work well with electric motors, generators and many other machines as well. 
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You will get so many advantages for three phase arrangements. Any single winding or phase definitely needs two conductors for transmission of its electrical power to a load. At the first time, it may seems that six conductors would require for the system. However, the waveform is considered to be those of current flowing in three phase windings. You can see that the sum of the three currents that are flowing on the three phase Automatic stator winding is zero at every instant in time. So as long as the three phases are loaded equally, the terminals can be connected together to form a neutral point which may either connected to ground or left open in some cases. So, the purpose of the field windings of exciter is placed on stator and the phase windings on its rotor.

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