The document describes a frictionless bicycle dynamo designed by Sujit Kr. Nayak. It introduces conventional bicycle dynamos that rub against tires, slowing riders down. The frictionless bicycle dynamo (FLBD) uses a small ball magnet inside a container that is induced to tumble by a passing external magnet, generating electricity in a coil to power lights without friction between components. The FLBD provides high efficiency and reliability while not slowing cyclists or adding weight. However, it has low power output and the external magnets may lose magnetic properties over time.

1. An Approach to design a
Frictionless Bicycle Dynamo
Presented By :
Sujit Kr. Nayak

2. FrictionLess Bicycle Dynamo
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Plan of the Talk…
 Introduction
 Conventional Bicycle Dynamo
 Working of FLBD
 The Complete System
 Advantages & Disadvantages
 Conclusion

3. FrictionLess Bicycle Dynamo
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Introduction …
Dynamo:
An Electrical generator which converts mechanical
energy into Electrical energy.
As bicycle is a man driven vehicle, the load on the
rider should be made as minimal as possible.
In this project, I tried to implement a Bicycle dynamo
with no friction between the tires and the dynamo head
there by reducing power losses and load on the rider.

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Conventional Bicycle Dynamo…
Almost all the conventional dynamo
rubs against the side of the tire and
powers incandescent lights (both
front and rear).
 It slows you down.
 Makes a lot of noise.
 Slips in the wet.
 Wears out the tires.
 They go out as soon as you stop
moving.

5. FrictionLess Bicycle Dynamo
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FLBD’s Working Principle…
 A small ball magnet is placed in a container, such
as a film can, with wire wrapped around it.
 Another magnet, outside the container passes by
the film can causing the magnet inside to tumble.
 When the magnet in the container flips, it induces a
current in the coil to power the lights.

6. FrictionLess Bicycle Dynamo
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Working…
Fig: Showing movement of Ball Magnet
with the effect of External Magnet

7. FrictionLess Bicycle Dynamo
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Components Used…
 A ball magnet.
 2 bar magnets.
 A 5000 turns coil.
 4 white front LEDs.
 2 red back LEDs.
 A 1N4248 diode (protect the white LEDs).
 A 5.1V zener diode.

8. FrictionLess Bicycle Dynamo
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Schematic Diagram…

9. FrictionLess Bicycle Dynamo
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The System Overview …
 The ball magnet is placed inside the coil made.
 It is sealed properly inside a container provided with
handle to fit to the bicycle.
 Fix the Bar Magnets on two opposite sides of the
wheel’s spoke.
 The separation distance between the dynamo and
the external magnet should be about 0.5cm.
 For the front Light, High intensity white LED (8000-
12000mcd) set is used.
 For Backlight, red LED set is used.

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Advantages…
 High efficiency: As there is no energy loss due
to Heat, Noise due to Friction, the Efficiency is
more.
 Visibility: Well visible under bright daylight
condition.
 Reliability: Very reliable and simple design, no
maintenance needed.

11. FrictionLess Bicycle Dynamo
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Advantages…
 This dynamo won't slow cyclist down.
 No friction on any parts of the bicycle.
 No drag can be detected in this device on bicycle.
So, you will not feel any extra weight when you are
cycling.

12. FrictionLess Bicycle Dynamo
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Disadvantages…
 Low power output. So, it can not be used for
heavy load like incandescent lamps.
 Possibilities of Magnetic property loss of the
external magnet due to external factors like
Heat and Mechanical impact.

13. FrictionLess Bicycle Dynamo
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Conclusion…
 By adopting this design of Dynamo in bicycle,
the loss of energy due to friction can be
reduced up to zero value.
 Also the noise produced by the dynamo can
be reduced.
 Load on the rider can be minimised.

14. FrictionLess Bicycle Dynamo
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Thank U…