Specifications

Fig.3.5 - Double layer windings

Fig.3.6 - Single layer winding

3.2 DIFFERENT SHAPE OF SLOTS : There are different shapes of slots used for electrical

machines. The slots used in the stator of induction motors, may be completely open or semi-

closed as shown in Fig. 3.7 (a).

Fig.3.7 - Different shapes of slots

The types of rotor slots used for squirrel cage induction rotor may be either closed or semi-

closed types as shown in Fig. 3.7 (b).

The slots used in the armature of dc machines, may be completely open or semi-closed

as shown in Fig. 3.7 (c).

(a) Semi-closed and open slots

(b) Types of rotor slots