Induction Motors - Rotating Field, Slip and Torque 147
Plate 5.2 Cage rotor for induction motor. The rotor conductor bars and end
rings are cast in aluminium, and the blades attached to the end rings serve as a
fan for circulating internal air. An external fan will be mounted on the
non-drive end (Photograph by courtesy of GEC Electromotors Ltd)
amplitude with angle. Getting the right pole-number is not
difficult: we simply have to choose the right number and
pitch of coils, as shown in the developed diagrams of an
elementary 4-pole winding shown in Figure 5.3.
360
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