senior dating Brøndby - Single phase induction motor ppt presentation

durch  |  22-Apr-2017 00:00

Single phase induction motor ppt presentation
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Single phase induction motor ppt presentation-67

When the flux decreases from maximum positive value to zero - In this region the rate of decrease in the flux and hence current is very high.

Since the copper band is short circuit the current starts flowing in the copper band due to this induced emf. Now according to Lenz's law the direction of the current in copper band is such that it opposes its own cause i.e decrease in current.

Since the copper band is short circuit the current starts flowing in the copper band due to this induced emf. Now according to Lenz's law the direction of this current in copper band is such that it opposes its own cause i.e rise in current.

So the shaded ring flux opposes the main flux, which leads to the crowding of flux in non shaded part of stator and the flux weaken in shaded part.

The single phase induction motors are made self starting by providing an additional flux by some additional means.

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