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  Development of Winding DC Machine

Introduction to Development of Winding - DC Machine:

General Procedure for Development of Winding Diagram:

1. Compute the number of coil sides for the main winding diagram.

2. Compute the back pitch, Yb, the winding pitch, Y, and the front pitch, Yf, correspondingly.

3. Create a winding table by using the back pitch, Yb, and the front pitch, Yf.

4. For representation of the main winding diagram, draw solid vertical lines of equivalent length at equivalent distance equal to number of coils. These solid lines point out the top layer coil sides.

5. Draw dotted vertical lines of similar length and distance close to the solid vertical lines (that is equivalent to number of coils). These dotted lines point out bottom layer coil sides.

6. Assign even number to the bottom right side of the dotted lines and odd numbers to the top left side of the solid lines.

7. Complete the connection to the coil sides by using the winding table, along with solid lines for top layer coil sides and dotted lines for bottom layer coil sides.

8. By using the main winding diagram, draw solid vertical lines (that is equivalent to number of coils) from the top mid-point of each front end connections.

9. Present commutator segments (equivalent to number of coils) by rectangular boxes below the front end connections.

10. Divide the coils from the number of poles. This provides the allocation of coil sides to pole regions.

11. Find out the current direction by applying the right hand rule of Fleming, while the mode of operation is a generator and the left hand rule of Fleming, while the mode of operation is a motor. Or the current direction to all coil sides can be arbitrarily supposed. Mark downward current direction for the coil sides within the North Pole regions and upward current direction within South Pole regions.

12. To set the brush arm positions and to find the number of parallel paths offered through the armature winding, draw the commutator ring diagram /equivalent end ring diagram.

13. To sketch the commutator ring diagram/equivalent end ring diagram, draw vertical solid lines equivalent to number of coil sides and join them with reference to winding table.

14. As well mark the current direction by the coil sides with reference to main winding diagram.

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