This document compares several types of motors. It discusses how electric motors convert electrical energy to mechanical energy and come in various sizes, from huge industrial motors to small motors used in automobiles and appliances. It then focuses on comparing single-phase induction motors and three-phase induction motors. Some key differences highlighted are that single-phase induction motors have lower starting torque but are simpler, more reliable and economical, while three-phase induction motors have higher starting torque but are more complex, costly and have higher efficiency and power factor.

1. CASE STUDY ON
COMPARISON OF SEVERAL TYPES OF MOTORS
BY : ABHISHEK SHARMA

2. Almost every mechanical movement that we see around us is
accomplished by an electric motor. Electric machines are a means
of converting energy. Motors take electrical energy and produce
mechanical energy. Electric motors are used to power hundreds of
devices we use in everyday life. Motors come in various sizes.
Huge motors that can take loads of 1000’s of Horsepower are
typically used in the industry. Some examples of large motor
applications include elevators, electric trains, hoists, and heavy
metal rolling mills.
Examples of small motor applications include motors used in
automobiles, robots, hand power tools and food blenders.
Micro-machines are electric machines with parts the size of red
blood cells, and find many applications in
medicine.

3. Electromechanical Energy Conversion
An electromechanical energy conversion device is essentially a medium of transfer
between an input side and an output side. Three electrical machines (DC, induction and
synchronous) are used extensively for electromechanical energy conversion.
Electromechanical energy conversion occurs when there is a change in magnetic flux
linking a coil, associated with mechanical motion.
Electric Motor
Electrical Energy
Mechanical Energy
Source load
Electric Generator motor
Mechanical Energy Electrical
Energy
Source load
generator

4. Compoun
d motors

11. BASIS
SINGLE PHASE INDUCTION
MOTOR
THREE PHASE INDUCTION
MOTOR
Supply
SINGLE PHASE INDUCTION
MOTORSingle Phase induction
motor uses single phase supply,
for its operation.
THREE PHASE INDUCTION
MOTORThree Phase induction
motor uses three phase supply,
for its operation.
Starting torque
SINGLE PHASE INDUCTION
MOTORThe starting torque is low.
THREE PHASE INDUCTION
MOTORThe starting torque is
high.
Maintenance
SINGLE PHASE INDUCTION
MOTORThey are easy to repair
and maintain.
THREE PHASE INDUCTION
MOTORDifficult to repair and
maintain.
Features
SINGLE PHASE INDUCTION
MOTORSimple in construction,
reliable and economical as
compared to three phase
induction motors.
THREE PHASE INDUCTION
MOTORComplex in construction
and costly.
Efficiency
SINGLE PHASE INDUCTION
MOTOREfficiency is less
THREE PHASE INDUCTION
MOTOREfficiency is high
Power factor
SINGLE PHASE INDUCTION
MOTORPower factor is low
THREE PHASE INDUCTION
MOTORPower factor is high
Examples
SINGLE PHASE INDUCTION
MOTORThey are mostly used in
domestic appliances such as
mixer grinder, fans, compressors
THREE PHASE INDUCTION
MOTORThree phase induction
motors are mostly used in