A three phase stator is shown below. The positive polarity of the currents is shown in the image. The windings are fed with the following balanced three phase currents: la-lmcos(wt) Ib-Imcos(wt-90°) Ic=Imcos(wt+90°) a) Where would you label the positive axes of all three phase windings in the image? b) Draw the magnetic field vectors produced by each single phase, and the total rotating magnetic field for wt = 0° and wt = 90° in the following figures. c) Is the rotating magnetic field clockwise or counter-clockwise?

A three phase stator is shown below. The positive polarity of the currents is shown in the image. The windings are fed with the following balanced three phase currents: la-lmcos(wt) Ib-Imcos(wt-90°) Ic=Imcos(wt+90°) a) Where would you label the positive axes of all three phase windings in the image? b) Draw the magnetic field vectors produced by each single phase, and the total rotating magnetic field for wt = 0° and wt = 90° in the following figures. c) Is the rotating magnetic field clockwise or counter-clockwise?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.1MCQ: The Ohms law for the magnetic circuit states that the net magnetomotive force (mmf) equals the...

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