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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?

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 8RQ
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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?
Transcribed Image Text: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?
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