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Shaded pole single phase induction motors


shaded pole single phase induction motors

As the flux decreases (portion BC of the alternating current cycle current is induced in the shading coil so as to oppose the decrease in current.
The direction of current in shading coil is such as to oppose the cause producing it (from Lenz law).
The smaller portion carries the copper band and is called as shaded portion of the e slot is approximately one third distance from the edge of the pole.Consequently, the flux distribution männer kennenlernen wiesbaden across the pole is uniform Fig 3 since no current is flowing in the shading coil.So the flux in the shading coil decreases and it opposes the main flux.Considering a cycle of alternating current (fig 1) applied to the stator suche frau fur eine nacht koln winding we will explain the working of shaded pole motor.So the shading ring does not affect the distribution of main flux.Selecting a 2 poled stator gives a synchronous speed of 3000 rpm while a 4 poled stator speed will be 1500rpm for 50Hz supply.This loop is known as the shading coil.The pictures in this article also shows a 2 pole motor.
According to Lenz law the direction of this current is so as to oppose the cause producing it (the decreasing alternating current).
Why Magnetic Axis Shift Takes Place?
Consequently, the flux distribution across the pole is uniform See Fig 3 since no current is flowing in the shading coil.
The flux is distributed uniformly and the magnetic axis lies at the center of pole e magnetic axis is denoted as ND in the picture.
Now let us discuss why the axis shift occurs when current is passed through the winding and how the shading coil aids in producing the e current carried by stator winding produces alternating flux.
A slot is cut across the lamination of the pole.Stator, the stator has salient poles.The short circuited copper coil described above is placed in this slot.The resulting current in the shading coil will be in such a direction (Lenzs law) so as to oppose the change in flux.Gramophones, hair dryers, photo copying machines etc.A portion of each pole is surrounded by a short-circuited turn of copper strip called shading coil.Is induced in the shading coil.So we can call this part as the shaded part and other part of the pole as unshaded part.Consequently, a small starting torque is developed.Rotor, the rotor of shaded pole induction motors is Squirrel Cage type rotor.Now consider that the alternating current has reached its peak (or) somewhere near the peak.Each pole carries a copper band on one of its unequally divided part called shading ban.A shaded pole motor and its schematic diagram are shown in the figures above.


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