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The armature current of the 15-hp, 230 V, 1800 rpm shunt DC motor in nominal operation is 60 A. The excitation winding resistance of the motor is 92 2, the armature winding resistance is 0.15 2 and the brush resistance is 0.1 2. The excitation flux of the machine is controlled with the adjustment resistor (Rayr) connected in series to the excitation circuit. are being. In the table below the armature voltage with the excitation current of the motor for 1800 rpm Examples of values are given (do not consider armature reaction in calculations).

The armature current of the 15-hp, 230 V, 1800 rpm shunt DC motor in nominal operation is 60 A. The excitation winding resistance of the motor is 92 2, the armature winding resistance is 0.15 2 and the brush resistance is 0.1 2. The excitation flux of the machine is controlled with the adjustment resistor (Rayr) connected in series to the excitation circuit. are being. In the table below the armature voltage with the excitation current of the motor for 1800 rpm Examples of values are given (do not consider armature reaction in calculations).

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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The armature current of the 15-hp, 230 V, 1800 rpm shunt DC motor in nominal operation is 60 A. The excitation winding resistance of the motor is 92 2, the armature winding resistance is 0.15 2 and the brush resistance is 0.1 2. The excitation flux of the machine is controlled with the adjustment resistor (Rayr) connected in series to the excitation circuit. are being. In the table below the armature voltage with the excitation current of the motor for 1800 rpm Examples of values are given (do not consider armature reaction in calculations). EA (V) IF (A) 8,5 120 162 188 200 212 0,80 1,00 1,28 1,44 2,88 a.) Draw the equivalent circuit of the shunt motor with a setting resistor connected in series to the excitation circuit. b.) Operating status at nominal load where the setting resistor value is zero (Rayr = 0 2) Calculate the friction loss of the engine using. c.) Calculate the efficiency of the engine for the operating state in item b (neglect iron loss please). d.) What will be the speed and efficiency of the loaded motor with 50% of the nominal load
Transcribed Image Text:The armature current of the 15-hp, 230 V, 1800 rpm shunt DC motor in nominal operation is 60 A. The excitation winding resistance of the motor is 92 2, the armature winding resistance is 0.15 2 and the brush resistance is 0.1 2. The excitation flux of the machine is controlled with the adjustment resistor (Rayr) connected in series to the excitation circuit. are being. In the table below the armature voltage with the excitation current of the motor for 1800 rpm Examples of values are given (do not consider armature reaction in calculations). EA (V) IF (A) 8,5 120 162 188 200 212 0,80 1,00 1,28 1,44 2,88 a.) Draw the equivalent circuit of the shunt motor with a setting resistor connected in series to the excitation circuit. b.) Operating status at nominal load where the setting resistor value is zero (Rayr = 0 2) Calculate the friction loss of the engine using. c.) Calculate the efficiency of the engine for the operating state in item b (neglect iron loss please). d.) What will be the speed and efficiency of the loaded motor with 50% of the nominal load
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