Capacitor Start Single Phase Induction Motor Pdf Download >

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The resultant of these two current is IT. It is then obvious that the increase in the angle (from 30 degrees to 80 degrees) alone increases the starting torque to nearly twice the value developed by a standard split-phase induction motor. We are familiar with this fact that the current flowing through the capacitor leads the voltage. It is to be appreciated that the resultant current I, is small and is almost in phase with the applied voltage V. Capacitor start capacitor run induction motor ( two value capacitor method). In case of split phase induction motor we use resistance for creating phase difference but here we use capacitor for this purpose. In order to clearly understand the working of shaded pole induction motor consider three regions- When the flux changes its value from zero to nearly maximum positive value.

Gunn Oscillator. PreviousNext . REGION 1: When the flux changes its value from zero to nearly maximum positive value In this region the rate of rise of flux and hence current is very high. These poles are shaded by copper band or ring which is inductive in nature. These motors are usually available in a range of 1/300 to 1/20 KW. Deep Bar Double Cage Induction Motor. This non uniform distribution of flux causes magnetic axis to shift in the middle of the non shaded part.REGION 2: When the flux remains almost constant at its maximum value- In this region the rate of rise of current and hence flux remains almost constant. slide 4 of 4 Image Credits:

www.tpub.com www.allaboutcircuits.com A/C-D/C Machines by A.K & B.L. The speed reversal is also difficult and expensive as it requires another set of copper rings. The single phase induction motors are made self starting by providing an additional flux by some additional means.

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