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Constructional Features of D.C Machines

Goals of the lesson
In this lesson, important constructional features of a D.C machine are presented along with a discussion on D.C armature winding.
Key Words: Field winding, armature winding, commutator segments & brush arrangement.
After going through this section students will have clear ideas about the followings:
• The function of commutator & brush in a D.C Machine.
• Double layer winding.
• Coil span & commutator pitch.
• Lap & wave winding and number of armature parallel paths

L-35.pdf

Principle of Operation of D.C Machines

The following sections begin by giving some important information which are true for all most all kinds of rotating electrical machines. It is first explained that two torques namely the driving torque and the load torque will exist during the operation of the machine both as generator and motor. After going through the lesson one will understand:
2. that motoring & generating actions go side by side.
3. the dynamics involved while the operating point moves from one steady state condition to another.

L-36.pdf

EMF & Torque Equation

Goals of the lesson
After going through the lesson, the student will be able to understand:
1. the factors on which induced voltage in the armature depend.
2. the factors on which the electromagnetic torque developed depend.
3. the derivation of the emf and torque equations.
4. that emf and torque equations are applicable to both generator and motor operations.
5. why the generated emf in motor called the back emf.
6. armature reaction, its ill effects and remedial measures.
7. the purpose of compensating winding – its location and connection.
8. the purpose of interpole – its location and connection.
9. the difference between the GNP (geometric neutral plane) and MNP (magnetic neutral plane).

L-37.pdf

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