ELECTRICAL MACHINES-

DC MOTORDC MOTOR

BY- PRASAD A. PAWASKAR SPN NO.-0903055

DETE 2 SEMSESTER

Take a ride of motor! This presentation consists of the following concepts

related to the electrical machine which is used everywhere called ‘DC MOTOR’.

What are electrical machines? What’s a Dc Motor? It’s basic parts. Animated working. Different Motors. Compare generator & motor diagrammatically. Summary.

Electrical MachinesElectrical MachinesAn Electrical machine is a device

that converts mechanical energy to electrical energy or vice versa, and changes AC voltage from one level to another level.

Electrical machines are divided into three parts:

1.Generator

2. Motor

3. Transformer

DC MOTORDC MOTORIn any electric motor, operation is based on simple electromagnetism. A current-carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field.

Dc motor basic partsDc motor basic parts Every DC motor has six

basic parts-axle, rotor , stator, commutator, field magnet(s), and brushes.

In most common DC motors , the external magnetic field is produced by high-strength permanent magnets,

Stator-stationary part of the motor

rotor -consists of windings

Detailing of Parts The two important parts of a Dc motor is the Rotor & Stator. In simple words Rotor is the rotating part of motor & Stator is the

stationary part of the motor. The Rotor actually as two sides in middle there is a AXLE, means

that it is like a wheel which helps the Rotor to rotate. The Rotor is covered with the windings. These parts are actually placed in another part that’s called the

Metal FRAME. The most basic part needed for working of any kind of motor is

the FIELD MAGNETS.

Basic words related to a DC Motor TORQUE-TORQUE- Any kind of Force on the

system(conductor). STARTERSTARTER-Device that creates a Force

internally that tends due an internal combination to cause Rotation of the engine(motor.)

LOAD- LOAD- External force acting on the mechanism.

Working of a Simple DC MOTOR

Next slide

Types of MotorsTypes of Motors There are various types of

motors having the same basic principle:

1. Synchronous Motors2. Induction Motors3. Stepper-Motors4. Universal motors

Compare generator & motor

MOTOR

GENERATOR

Summary The following are the important points that

should be noted while considering a DC MOTOR:1. Dc motor is most used electrical machine.2. Converts electrical to mechanical energy.3. The mechanical movement produced due to

torque.4. A Dc motor should never be started without

load.5. Starters are essential for starting all motors.6. Dc motor is simply converse of a Dc Generator.