The document reviews key concepts related to D.C. machines, including main components, the derivation of the EMF equation, and the significance of back EMF. It covers different types of D.C. motors, such as shunt, series, and compound motors, and their applications in various industries. Students will learn to explain motor types, derive voltage and current equations for each, and understand how to reverse the motor's direction of rotation.

1. Unit 3-Session 4
Electrical Machines-I
Unit 3: DCMachines

2. Review of previous Lecture
• Main parts of D.C. Machine, its function
and material used
• Derivation of emf equation of D.C.
Generator
• Significance of back emf

3. Learning Objectives
Types of D.C. Motors
Equations of V and I for each
Reversal of direction of motor

4. Learning Outcomes
Students will be able to :
Explain types of D.C. Motors
Find out the equations of V and I for each type
Change the of direction of rotation of Motor

5. TYPES OF D C MOTORS
1. D.C. Shunt Motor
Applications for these
motors vary but are
often for larger
applications such as
unwind brake
generators,
conveyors, mixers etc.

6. TYPES OF D C MOTORS
1. D.C. Series Motor
High starting
loads such as
traction, crane
and other heavy
applications.

7. TYPES OF D C MOTORS
1. D.C. Compound- Long Shunt
Applications for these
motors vary but are
often for larger
applications such as
unwind brake
generators,
conveyors, mixers etc.

8. TYPES OF D C MOTORS
1. D.C. Compound- Short Shunt
Applications for these
motors vary but are
often for larger
applications such as
unwind brake
generators,
conveyors, mixers etc.

9. Motor direction reversal of rotation

10. Wrap up
1.Explain types of D.C. Motors
2.Find out the equations of V and I for each type
3. How will you change the of direction of rotation of Motor