18. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following standstill impedances: Main winding: Zm =5+j6.25 Auxiliary winding: Za =8+j6 a) Determine the value of capacitance to be added in series with the auxiliary winding to obtain maximum starting torque. b) Compare the starting torques and starting current with and without the added capacitance in the auxiliary winding circuit when operated from a 120V, 60HZ supply.
18. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following standstill impedances: Main winding: Zm =5+j6.25 Auxiliary winding: Za =8+j6 a) Determine the value of capacitance to be added in series with the auxiliary winding to obtain maximum starting torque. b) Compare the starting torques and starting current with and without the added capacitance in the auxiliary winding circuit when operated from a 120V, 60HZ supply.
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Transcribed Image Text:18. A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following standstill
impedances:
Main winding:
Zm =5+j6.25
Auxiliary winding: Za =8+j6
a) Determine the value of capacitance to be added in series with the auxiliary winding to obtain
maximum starting torque.
b) Compare the starting torques and starting current with and without the added capacitance in the
auxiliary winding circuit when operated from a 120V, 60HZ supply.
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