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EE 255 - Chapter 9d

# EE 255 - Chapter 9d - n= EA 230 V no =(1800 r/min = 1711...

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245 ( ) 230 V 1800 r/min 1711 r/min 242 V A o Ao E n n E = = = 9-22. The magnetization curve for a separately excited dc generator is shown in Figure P9-7. The generator is rated at 6 kW, 120 V, 50 A, and 1800 r/min and is shown in Figure P9-8. Its field circuit is rated at 5A. The following data are known about the machine: Note: An electronic version of this magnetization curve can be found in file p97_mag.dat , which can be used with MATLAB programs. Column 1 contains field current in amps, and column 2 contains the internal generated voltage E A in volts.

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247 A Ao o E n E n = ( ) 2000 r/min 129 V 143 V 1800 r/min A Ao o n E E n = = = The minimum possible field current occurs when adj R = 30 Ω . The current is ,max adj 120 V 2.22 A 24 30 F F F V I R R = = = + Ω + Ω From the magnetization curve, the voltage Ao E at 1800 r/min is 87.4 V. Since the actual speed is 1500 r/min, the maximum no-load voltage is A Ao o E n E n = ( ) 1500 r/min 87.4 V 72.8 V 1800 r/min A Ao o n E E n = = = 9-23. If the armature current of the generator in Problem 9-22 is 50 A, the speed of the generator is 1700 r/min, and the terminal voltage is 106 V, how much field current must be flowing in the generator? S

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EE 255 - Chapter 9d - n= EA 230 V no =(1800 r/min = 1711...

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