Page 126 - Electrical Equipment Handbook _ Troubleshooting and Maintenance
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INDUCTION MOTORS
INDUCTION MOTORS 6.15
(a) (b)
(c) (d)
FIGURE 6.18 Laminations from typical squirrel-cage induction motor rotors, showing the cross section of the
rotor bars: (a) NEMA design class A—large bars near the surface. (b) NEMA design class B—large, deep rotor
bars. (c) NEMA design class C—double-cage rotor design. (d) NEMA design class D—small bars near the
surface. (Courtesy of MagneTek, Inc.)
FIGURE 6.19 Per-phase equivalent circuit of an induction motor.
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