Subject – Elements of Electrical Design (2150904)Branch – Electrical Topic – Design of DC Armature WindingName Enrollment No. Abhishek Chokshi 140120109005 Himal Desai 140120109008

Gandhinagar Institute Of Technology

Guided By – Prof. Jaimini Gohel

CONTENT• Armature winding• Terms Related to Armature Winding• Types of Armature Winding

DC WINDINGS• Lap Winding• Simplex Lap Winding• Duplex Lap Winding• Condition for Lap Winding• Wave Winding • Progressive Wave Winding• Retrogressive Wave Winding• Condition for Wave Winding• Comparison of Lap Winding and Wave Winding• Examples

Armature winding

• The armature winding is the main current-carrying winding in which the electromotive force or counter-emf of rotation is induced.

• The current in the armature winding is known as the armature current.

• The location of the winding depends upon the type of machine.• The armature windings of dc motors are located on the rotor, since

they must operate in union with the commutator.• In DC rotating machines other than brushless DC machines, it is

usually rotating.

Terms related to Armature Winding• Conductor: The length of wire embedded in the slot• Turn: The two conductor placed in different slots when connected

together to form a turn.

• Coil: The two active conductor i.e back and front conductor constitute one coil. The coil may be single turn coil or multi turn coil.

Types of Armature Winding

• According to the way of connecting the conductors, DC armature windings are classified as:

Armature Winding

Lap Winding Wave Winding

Lap Winding• Lap winding is the winding in which successive coils overlap each

other. It is named "Lap" winding because it doubles or laps back with its succeeding coils.

• In this winding the finishing end of one coil is connected to one commutator segment and the starting end of the next coil situated under the same pole and connected with same commutator segment.

Simplex Lap Winding

• A winding in which the number of parallel path between the brushes is equal to the number of poles is called simplex lap winding.

Duplex Lap Winding• A winding in which the number of parallel path between the

brushes is twice the number of poles is called Duplex lap winding.

Condition for Simplex Lap Winding

Wave Winding• Wave winding is one type of armature winding. In this winding the

end of one coil is connected to the starting of another coil of the same polarity as that of the first coil.

• This winding forms a wave with its coil, that’s why it is named as wave winding. It is also called series winding because its coils are connected in series.

Progressive Wave Winding• If after one round of the armature the coil falls in a slot right to its

starting slot the winging is called Progressive wave winding.

Retrogressive Wave Winding• If after one round of the armature the coil falls in a slot left to its

starting slot the winging is called Retrogressive wave winding.

Condition for Simplex Wave Winding

Lap Winding Wave Winding

1. In this winding all the pole groups of the coils generating

e.m.f in the same direction at any instant of time are connected in parallel by the brushes.

1. In this winding all the coils carrying current in thesame direction are connected in series i.e., coils carrying current in one direction are connected in one series circuit and coils carrying current in opposite direction are connected in other series circuit.

2. Lap winding is also known as parallel windings. 2. Wave winding is also known as series winding.

3. The number of parallel path is equal to the number of poles i.e., A = P.

3. The number of parallel paths is always equal to 2i.e., A = 2.

4. The number of brush required by this windingis alwaysequal to the number of poles.

4. The number of brushes required by this windingis always equal to 2.

5. The machine using lap winding requires equalizer ringsfor obtaining better commutation.

5. The machine using wave winding does require dummycoils to provide the mechanical balance for the armature.

6. Lap windings are used for low voltage and high currentmachines.

6. Wave windings are used for high voltage and low current machines.

7. Lap windings are generally used for machines of ratingsabove 500 kW.

7. Wave windings are generally used for machines ofratings below 560 kW

Winding Table:1 10 19 28 3 12 21 30 5 14 23 32 7 16 25 34 9 18 27 2 11 20 29 4 13 22 31 6 15 24 33 8 17 26 1( ) indicate back connection( ) indicate front connection

Winding Table:1 6 3 8 5 10 7 12 9 14 11 16 13 2 15 1( ) indicate back connection( ) indicate front connection

References• www.wikipedia.org• https://iitg.vlab.co.in/• https://coep.vlab.co.in/• https://www.youtube.com/watch?v=jttjCzv_rQo• Techmax Publication