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  Half Coil Winding

Introduction to Half coil winding

If the 1st phase, say R or A phase starts at slot number 1, the Y or B phase have to be start at 1200/300 = 4 slots away that is, in slot (1 + 4 = ) 5, and the B or C phase should begin at (5 + 4 =) 9.

The winding have to be connected among alternate North and South poles. First, R or A phase winding is started. If one side of the coil is located in slot number 1, the another side of the coil should be located in slot number 8, that is, the last coil side of phase R or A phase within the next pole.

The coil side in slot number 2 should be connected to the last but one coil side of similar phase within the next pole, that is, slot number 7, in this case. Now, the coils formed through coil sides placed in the slots number 1 and 8, and 2 and 7 belong to similar phase, and are concentric with each other.

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Diagram - Coil group connections for half coil winding

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Diagram - 3 phase 4 pole 24 slots single layer winding main diagram (half coil)

The preceding figure provides the coil group connections for half coil winding for each phase.

They create a coil group. The standard rule for connecting jointly the coils in a coils group is that the end wire of one coil has to be connected to the starting of next coil in the group and so on. This is completed in order that the emfs of the coils in a coil group add.

The above figure provides the complete main winding diagram for a 4 pole 24 slots ac machine by using single layer half coil winding. In the above diagram, RS, RF, BS, BF, YS, and YF point out the starting and finishing ends of RBY phases correspondingly.

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