ECE131 BASIC ELECTRICAL AND

ELECTRONICS ENGINEERINGCase study”Comparisons of several types

motor”By :

Section: K-1613

Roll Number Name Registration Number

41 Abhinav Dwivedi

11606717

Electric MotorAn Electric motor is a machine which converts electric energy into mechanical energy. Its action is based on the principle that when a current-carrying conductor is placed in a magnetic field, it experiences a mechanical force whose direction is given by Fleming’s Left-hand Rule and whose magnitude is given by F = BIl Newton.

Electric Motor

• Used to turn fans, pumps and compressors• Facilitate the circulation of air, water,

refrigerant and other fluids• Motors are designed for particular

applications• The correct motor must always be used• Most motors operate on similar principles

USES OF ELECTRIC MOTORS

TYPES OF  MOTORSClassification Based On Power Supply:

1. Alternating Current (AC) Motors.

2. Direct Current (DC) Motor.

1.It is easy to control their speed in a wide rangeFor example, motors for driving rail vehicles were, until recently, exclusively DC machines.

Advantages of DC motors:

Disadvantages of DC motors: 1.Since they need brushes to connect the rotor winding. Brush wear occurs, and it increases dramatically in low‐pressure environment.

TYPES OF DC MOTORS

TYPES OF AC MOTORS(a) Synchronous Motors

(b) Asynchronous Motors

(a) Shunt-wound motor

(b) Series-wound motor

(c) Compound motor

PARTS OF AN ELECTRIC MOTOR

• Stator with motor windings – Stationary portion of the motor• Rotor – Rotating portion of the motor• Bearings – Allow free rotation of the motor shaft• End bells – Supports the bearings and/or shaft• Housing – Holds all motor components together and facilitates motor

mounting• YOKE -The outer frame or yoke serves double purpose.• Pole Shoes -The field magnets consists of pole cores and pole shoes.• Field Coils-The field coils or pole coils, which consist of copper wire of strip,

are former-wound for the correct dimension.• Armature windings -The armature windings are usually former-wound.

• Commutator - The function of Commutator is to facilitate collection of current from the armature conductors in case of generator i.e. as rectifier and in case of motor which can provide current to the armature conductors i.e. as an inverter.

• Brushes and Bearings - The Brushes, whose function is to collect current from Commutator or to supply current to Commutator as in the case of generator and motor respectively, are usually made of carbon or graphite and are in the shape of a rectangular block.

PARTS OF AN ELECTRIC MOTOR

• The interaction between the magnetic field and current carrying conductor is explained by Fleming’s right hand rule.

Principle of DC motors

Application depends on Different sizes of motors

Smallest motors can be found in • Electric wrist watches

Medium size motors can be found • To provide convenient mechanical power for industrial use

The very largest electric motors are used• for propulsion of ships, pipeline compressors, and water pumps

with ratings in the millions of watts.

Rotor of DC motor

Applications of DC Motors

ECE131 BASIC ELECTRICAL AND

ELECTRONICS ENGINEERINGCase study”Comparisons of several types

motor”By :

Section: K-1613

Roll Number Name Registration Number

41 Abhinav Dwivedi

11606717