EEL3211F11HW4

# EEL3211F11HW4 - EEL 3211 Fall 2011 Homework#4 1 The stators...

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EEL 3211 Fall 2011 Homework #4 1. The stators of two three phase motors are wired as shown below with V aa’ = V m sin( ω t), V bb’ = V m sin( ω t+120°) and V cc’ = V m sin( ω t-120°). Determine the direction of rotation for the resulting net magnetic flux density for each stator. Explain your answers. At what frequency does the magnetic field of each stator rotate at if ω =377 radians/sec? Determine the direction of rotation for the resulting net magnetic flux density if each stator were rewired by swapping phases a and c. Explain your answers. Determine the speed, in Revolutions Per Minute, that would result if these stators were used to make synchronous motors assuming that ω =377 radians/sec. Repeat if ω =314 radians/sec. Determine ω for each motor if the rotational speed is to equal 1000 rpm. Figure 1 Figure 2 2. Figure 3 depicts a wire loop that is rotating in the clockwise direction about the axis labeled A in the presence of a constant and uniformly distributed magnetic flux density

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## This note was uploaded on 01/03/2012 for the course EEL 3211 taught by Professor Staff during the Fall '08 term at University of Florida.

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EEL3211F11HW4 - EEL 3211 Fall 2011 Homework#4 1 The stators...

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