15. A single-phase, 120 V, 60 Hz, four-pole, capacitor-start induction motor has the following standstill impedances: Main winding: Zm =5.5+j4.8 Auxiliary winding: Za =8.5+j5 a) Determine the value of the starting capacitor required to produce a 90o phase shift between the currents in the main and auxiliary windings. b) Compare the starting torques with and without the starting capacitor. c) Draw phasor diagrams for Im, Ia, and V, with and without the starting capacitor.
15. A single-phase, 120 V, 60 Hz, four-pole, capacitor-start induction motor has the following standstill impedances: Main winding: Zm =5.5+j4.8 Auxiliary winding: Za =8.5+j5 a) Determine the value of the starting capacitor required to produce a 90o phase shift between the currents in the main and auxiliary windings. b) Compare the starting torques with and without the starting capacitor. c) Draw phasor diagrams for Im, Ia, and V, with and without the starting capacitor.
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter8: Basic Electric Motors
Section: Chapter Questions
Problem 28RQ: What are the advantages and disadvantages of using the following types of motors?
shaded-pole...
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15. A single-phase, 120 V, 60 Hz, four-pole, capacitor-start induction motor has the following standstill impedances:
Main winding: Zm =5.5+j4.8
Auxiliary winding: Za =8.5+j5
a) Determine the value of the starting capacitor required to produce a 90o phase shift between the
currents in the main and auxiliary windings.
b) Compare the starting torques with and without the starting capacitor.
c) Draw phasor diagrams for Im, Ia, and V, with and without the starting capacitor.
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