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DC MACHINES
Page 2


DC MACHINES
DC Generator
Mechanical energy is converted to  electrical
energy
Three  requirements  are  essential
1. Conductors
2. Magnetic field
3. Mechanical energy
Page 3


DC MACHINES
DC Generator
Mechanical energy is converted to  electrical
energy
Three  requirements  are  essential
1. Conductors
2. Magnetic field
3. Mechanical energy
Working principle
A generator works on the principles of
Faraday’s law of electromagnetic induction
Whenever  a conductor is moved in the
magnetic field , an  emf is induced and the
magnitude of the induced  emf is directly
proportional to the rate of change of flux
linkage.
This emf causes a current flow if the
conductor circuit is closed .
Page 4


DC MACHINES
DC Generator
Mechanical energy is converted to  electrical
energy
Three  requirements  are  essential
1. Conductors
2. Magnetic field
3. Mechanical energy
Working principle
A generator works on the principles of
Faraday’s law of electromagnetic induction
Whenever  a conductor is moved in the
magnetic field , an  emf is induced and the
magnitude of the induced  emf is directly
proportional to the rate of change of flux
linkage.
This emf causes a current flow if the
conductor circuit is closed .
DC Machine
Commutator
Page 5


DC MACHINES
DC Generator
Mechanical energy is converted to  electrical
energy
Three  requirements  are  essential
1. Conductors
2. Magnetic field
3. Mechanical energy
Working principle
A generator works on the principles of
Faraday’s law of electromagnetic induction
Whenever  a conductor is moved in the
magnetic field , an  emf is induced and the
magnitude of the induced  emf is directly
proportional to the rate of change of flux
linkage.
This emf causes a current flow if the
conductor circuit is closed .
DC Machine
Commutator
Sectional view of a DC machine
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57 docs|62 tests

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FAQs on PPT: DC Machines - Basic Electrical Technology - Electrical Engineering (EE)

1. What are DC machines?
Ans. DC machines, also known as direct current machines, are electrical machines that convert direct current electrical energy into mechanical energy or vice versa.
2. What are the main components of a DC machine?
Ans. The main components of a DC machine include the stator, which houses the field winding, and the rotor, which carries the armature winding. Other components include brushes, commutator, and bearings.
3. How does a DC machine work?
Ans. A DC machine works on the principle of electromagnetic induction. When a direct current is supplied to the field winding, it creates a magnetic field. This magnetic field interacts with the armature winding, which is connected to a load, causing the rotor to rotate and generate mechanical energy.
4. What are the advantages of DC machines over AC machines?
Ans. DC machines have several advantages over AC machines, including better speed control, higher starting torque, and simpler construction. Additionally, DC machines are more suitable for applications that require frequent starting, stopping, and reversing.
5. What are the applications of DC machines?
Ans. DC machines find applications in various industries, including electric vehicles, industrial machinery, renewable energy systems, and battery charging. They are commonly used in applications where precise speed control and high starting torque are required.
57 docs|62 tests
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