December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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446 Introduction to Electrical Power and Power Electronics
TABLE 16.2
Speed and Direction of Rotation of Magnetic Flux Created by Various
Harmonic Currents
Harmonic Order
Frequency in 60-Hz
System (Hz)
Synchronous Speed in Four-Pole,
60-Hz Motor (rpm)
Direction of
Rotation
1 (fundamental) 60 1800 Forward
5 300 5 × 1800 Backward
7 420 7 × 1800 Forward
11 660 11 × 1800 Backward
13 780 13 × 1800 Forward
17 1020 17 × 1800 Backward
19 1140 19 × 1800 Forward
23 1380 23 × 1800 Backward
25 1500 25 × 1800 (45,000 rpm) Forward
FIGURE 16.6 Sixth harmonic motor torque pulsations produced by 5th and 7th harmonic
currents. (Courtesy of Bill Veit, U.S. Merchant Ma ...
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