Page 106 - Electrical Equipment Handbook _ Troubleshooting and Maintenance

AC MACHINE FUNDAMENTALS

AC MACHINE FUNDAMENTALS 5.7

FIGURE 5.5 A rotating magnetic field inside a fixed coil: (a) Perspective view; (b) end view.

e υBl sin
ba
2. Segment bc. The voltage on segment bc End view
is zero, since the vector quantity v × B B
is perpendicular to l.
c–d
e (v × B)•l
cb
v rel
0
3. Segment cd. The angle between υ and B
in segment cd is , while the quantity v B
× B is in the direction of l. So

e (v × B)•l
dc
υBl sin directed out of page

4. Segment da. The voltage on segment da 180- B
is zero, for the same reason as in seg-
ment bc:
v rel
a–b
e 0
ad
FIGURE 5.6 The magnetic fields and velocities
The total voltage induced within a single- of the coil sides as seen from a frame of reference in
turn coil is given by which the magnetic field is stationary.

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