Dummy coils are required under wave winding only to make the machine mechanically balanced. Consider a problem to understand the dummy coils.
Design wave winding for 60 conductors, 15 slots, 4 poles
For designing of wave winding we should find average pitch (Y_a) and that should be integer.

For some set of data Y_a will not be integer. Therefore the nearest possible number of conductors are considered to make Y_a integer. But this will make the armature mechanically unbalance. For example one of the 15 slots will contain only 2 conductors as 2 are eliminated in the design itself. To make the machine mechanically balanced those two conductors were cut shot, insulated and placed in the slots as dummy coils. In this way dummy coils will mechanically balance the machine.

Related Articles

Also Read :

Leave a Reply Cancel reply