PEDESTAL FAN WITH TWO SIDE
BLADES
SUBMITTED BY
PA D M A N A B A N . S
P R AV E E N K U M A R . T
SAMUEL FRANK
S A R AVA N AT H A M I ZH A N . S
ABSTRACT
 In ordinary pedestal fan a single blade is used to
deliver the air and only one side of shaft is connected
with the blade which rotates in clockwise direction.
 Our project mainly focuses on increasing the delivery
of the air with low power consumption.
 Since it delivers air at two portions simultaneously,
it requires a minimum space where two fans has to
be used. By this simple modification it can be
installed in industries to deliver two opposite sides of
air at once.
 With the slight modification, we have increased the
discharge by 80% when compared when an ordinary
pump.
CONTENT
 Introduction
 Advantage
 Objectives
 Disadvantage
 Methodology
 Application
 Component diagram
 Future scope
 Bill of material
 Conclusion
 Fabrication work
 References
 Working principle
 Photographic view
 Cost of the project
INTRODUCTION
 Fans are widely used in industrial and commercial
applications.
 From shop ventilation to material handling to boiler
applications, fans are critical for process support and
human health.
 Primary air moving devices used in industrial
applications
 In the commercial sector, electricity needed to operate
fan motors composes a large portion of the energy
costs for space conditioning.
OBJECTIVES
This project is about pedestal fan with
double side blades.
we are providing two side blades opposite
with each other instead of single blade.
This will give a double side air delivery
with a single motor.
Compare to the ordinary pedestal fan the
delivery amount of air by the fan is
increased.
METHODOLOGY
DESIGN CALCULATION
SPECIFICATION
ORDINARY FAN
OUR FAN
VOLTAGE
247 V
247 V
CURRENT
2.08 A
2.10 A
56.67
110
46
48
AIR DELIVERY
(m3/min)
POWER INPUT (W)
Laws of Fan
 Fan rotational speed is typically measured in revolutions per
minute (rpm).
 Fan rotational speed has a significant impact on fan
performance,
as shown by the following fan laws:
 Airflow final = Airflow initial×(RPM initial/RPM final)
 Pressure final = Pressure initial×(RPM initial/RPM final)
 Power final = Power initial × (RPM initial/RPM final)
3
2
Diagram of Pedestal Fan
Parts of pedestal fan
 Shaft
 Coupling
 Blades
 Direction controller
 Protective covers
 Locking nut
 Bearing
 Blades
 Speed regulator
 Top locking clip
 Motor casing
 Side locking clip
 Copper coil
 Safety grille
 Pipes
 Tilt adjustable
 3 Speed switches
Effects of modification

Rotational speed must be considered concurrently
with other issues, such as;
 variation in the fan load
 air stream temperature
 ambient noise
 mechanical strength of the fan.
COMPONENT DRAWING(2D & 3D)
BILL OF MATERIAL
S.No
Name of the
component
Specification
Material
Quantity
1.
Motor casing
1/2 HP
Aluminum
1
2.
Copper coil
One roll
Copper
-
3.
Bearing
15mm ball bearing
Chrome steel
2
4.
Shaft
160mmlong,15mmdia
Steel
1
5.
Nut
1/4”*.25”
Cast iron
16
6.
Bolt
1/4”*1.5”
Cast iron
6
7.
Paint
Black
-
-
8.
Grilles
-
Plastic
2
9.
locking clip
-
Plastic
8
10.
Speed regulator
-
-
1
11.
3 Speed switches
-
Plastic
3
FABRICATION
 The electric motor is connected with both ends of the shaft.
we already machined is fitted inside the motor by welding.
After that the blade is connected to the ends of the shaft.
 We extend the shaft from the motor to provide a second blade
at another side of the motor.
 We are providing two side blades opposite with each other
instead of single blade.
 We are changing the blade angles and direction.
WORKING PRINCIPLE
BLADE ANGLE
 We change the angle of the blade to degree ‘α’ angle
 We increase the blade angle to get maximum air delivery and also increase
the number of wings to four. Thus increasing performance of pedestal fan
to high air delivery with minimum power consumption.
INDUCTION MOTOR

The current comes in the white wire, then the first winding
(top right) is clockwise, the next one (bottom right) is anticlockwise,
bottom left is clockwise again, top left is anticlockwise, then out the
other white wire. So, imagine a positive half-cycle of the mains, with
the current actually coming in that first wire.
WORKING PRINCIPLE
 The first winding produces a north pole facing in; the second a
South Pole facing in; etc, like this: N-S-N-S. Half a mains cycle later
(10 ms) the current has reversed and so must the magnetic sense of
the poles, which are now: S-N-S-N. The rotor is an electrical
conductor, and therefore tries to follow this field. To do so it has to
rotate through 90 degrees. The rotor thus takes two full cycles of the
mains (40 ms) to make a complete rotation, and so revolves at 1500
rpm. At least, it would if it could keep up with the rotating field.

But it can't, quite, and in fact it's only because it's slipping
behind that any torque is developed at all. So, it rotates a bit slower
than 1500 rpm (typically 1440 rpm) depending on how much torque
it is being called upon to produce. Note that the motor, as described
so far, could rotate happily clockwise or anticlockwise. This kind of
motor therefore needs some kind of internal cleverness to ensure it
only turns in the right direction. This is achieved, in this motor, by
the use of shaded poles.
COST OF THE PROJECT
S.No
Name of the
component
Quantity
No.
Unit price
Rs
Total price
Rs
1.
Motor casing
1
600
600
2.
Copper coil
-
400
400
3.
Welding
1
50
50
4.
Bearing
2
60
120
5.
Blades
2
150
300
6.
Shaft
1
80/kg
40
7.
Pipe
-
-
100
9.
Coupling
2
60
120
10.
Nut
16
5
80
11.
Bolt
6
5
30
12.
Grilles
2
-
80
13.
locking clip
8
10
80
14.
Speed regulator
1
-
300
15.
3 Speed switches
3
15
45
16.
Paint
-
50
50
17.
Labor charge
-
-
800
TOTAL
3115/-
Advantages
 Discharge is more
 Space requirement is less while using two fans
 Power consumption is low
 Delivery time is reduced
 It will available for low cost when it is mass produced
 It will replace the space of two fans by doing the same work.
 Deliver two opposite sides of air at once.
Disadvantages
 Motor life time slightly reduced.
 Motor efficiency is less
APPLICATION
 Since it delivers air at two portions simultaneously, it




requires a minimum space where two fans have to be
used. By this simple work it can be installed in
industries to deliver two opposite sides of air at once.
This single fan is used in a place where two fans are
required
It is used for widely used in industrial and also used in
home.
It is used for commercial purposes due to its portability
It is also used for personal purposes at home.
FUTURE SCOPE
 There is no oscillating system in our fan hence it
provides air at some constant direction for
implementing oscillating system it requires some
other new attachments.
 The cost of this project is comparatively low when it
will be mass produced. If the problems are rectified,
this will have a good scope in future and become a
completely successful one.
REFERENCE
1.
2.
3.
4.
5.
Sawada, Kazuo, "Magnetic Levitation (Maglev) Technologies
1.Supderconducting Maglev Developed by RTRI and JR Central",
Japan Railway & Transport Review, No. 25, 58-61.
He, J. L., Coffey, H. T., Rote, D.M. "Analysis of the Combined
MagLev Levitation, Propulsion, and Guidance System", IEEE
Transactions on Magnetics, Vol 31, No. # 2, March 1995, pp 981987.
Zhao, C. F., Zhai, W. M., "MagLev Vehicle/Guideway Vertical
RandomResponse and Ride Quality", Vehicle System Dynamics, Vol
38, No # 3., 2002, pp 185-210.
http://www.maglev.ir/eng/documents/papers/journals/IMT_JP_30.pd
f
http://cdn.intechopen.com/pdfs/34786/InTechStructural_and_kinema
tic_analysis_of_ems_maglev_trains.pdf
PHOTOGRAPHY
Conclusion
 Thus the pedestal fan is modified with two side blades
successfully.
 We completed the project successfully by double suction
and double delivery with 25% of increased discharge
when compared to single side suction Pedestal Fan.