Chegg Guided Solutions for Electric Machinery Fundamentals 5th Edition: Chapter 7

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  • Step 1 of 4

    (a) If the speed of rotation

    of the shaft is 500 rad/s, then the voltage induced in the rotating loop will


    Since the external battery voltage is only 48 V, this machine is operating as a generator, charging the battery.

  • Step 2 of 4

    (b) The current flowing out of the machine is approximately

    (Note that this value is the current flowing while the loop is under the pole faces. When the loop goes beyond the pole faces, eind will momentarily fall to 0 V, and the current flow will momentarily reverse. Therefore, the average current flow over a complete cycle will be somewhat less than 5.0 A.)

  • Step 3 of 4

    (c) If the speed of the rotor were increased to 550 rad/s, the induced voltage of the loop would increase to

    and the current flow out of the machine will increase to

  • Step 4 of 4

    (d) If the speed of the rotor were decreased to 450 rad/s, the induced voltage of the loop would fall to

    Here, eind is less than VB , so current flows into the loop and the machine is acting as a motor. The current flow into the machine would be

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