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Explain the different types of dc motor with neat sketch.
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 DC MOTOR TYPES

 Shunt Wound

 Series Wound

 Compound wound


1. Shunt Motor

 In shunt wound motor the field winding is connected in parallel with armature. The current through the shunt field winding is not the same as the armature current.  Shunt field windings are designed to produce the necessary m.m.f. by means of a relatively large number of turns of wire having high resistance. Therefore, shunt field current is relatively small compared with the armature current

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2. Series Motor: 


 In series wound motor the field winding is connected in series with the armature. Therefore, series field winding carries the armature current. Since the current passing through a series field winding is the same as the armature current, series field windings must be designed with much fewer turns than shunt field windings for the same mmf. Therefore, a series field winding has a relatively small number of turns of thick wire and, therefore, will possess a low resistance.

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3. Compound Wound Motor: Compound wound motor has two field windings; one connected in parallel with the armature and the other in series with it. There are two types of compound motor connections

1. Short-shunt connection

2. Long shunt connection

When the shunt field winding is directly connected across the armature terminals it is called short shunt connection.

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When the shunt winding is so connected that it shunts the series combination of armature and series field it is called long-shunt connection.

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