Fig. 1,516.—Copper strap or ribbon with insulation. These are generally from 1/32 to 1/16 inch thick with rounded edges as shown to avoid cutting the insulation.
Fig. 1,517.—Bar inductor. Its shape enables putting the maximum cross section of copper into the slot and is used to advantage on machines which generate large currents.
Fig. 1,518.—Style of armature core stamping used with bar wound machines. This construction, since there are no indentations in the teeth for wedges, makes it necessary to provide bands to hold the bars in place.
Ques. How are bar windings sometimes arranged?
Ans. In two layers, as in fig. 1,523.
Single and Multi-Slot Windings.—These classifications correspond to concentrated and distributed windings, previously described. In usual modern practice, only two-thirds of the total number of slots (assuming the spacing to be uniform)
