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Pedal power

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Pedal power

  1. 1.  Today, most people just flip a switch or push a button, and everything we depend on is readily available.  The electricity powering all these systems is something most people rarely think about until the power is no longer available for use.  It may be hard to believe that nearly 70% of all people have no access to electricity.  There is only one way to create a standalone system, and this is with a generator. Bicycle power Generator 2
  2. 2.  Primary objectives include:  Low Production Cost  High Safety  Secondary objectives include:  High Energy Efficiency  Low Upkeep  High Product Durability Bicycle power Generator 3
  3. 3.  The basic design for the bicycle powered generator is to have a bicycle on a fixed stand, and then when the bicycle is pedaled, the spinning motion of the rear tire is used to produce mechanical energy directly into a DC voltage.  If an AC voltage is produced, a full bridge rectifier will be necessary to produce the DC voltage.  This DC voltage can then be used immediately or stored via a battery array.  If a constant DC voltage is required by the user a DC-DC converter may be necessary to change the varying DC voltages produced from the varying bike speed to a constant DC voltage for certain utilities or battery array.  Another design factor that must be implemented and compared is the coupling of the bicycle wheel to either the alternator or dynamo rotor. Bicycle power Generator 4
  4. 4.  A bicycle is designed to convert human energy into mechanical energy for transportation purposes.  To maximize the efficiency of both conversions is essential to obtaining the maximum power output.  The bicycle is an efficient and robust method to convert between the two types of energy.  It is an efficient design that provides seating for the user as well as pedals and drive train that are easily activated.  The forces acting again a rider are due to off bike force such as wind, gravity, and rolling resistance.  These three off-bike forces make up about 95 percent of the force against you, which means the bike itself is about 95 percent efficient.  As published in the International Journal of Industrial Ergonomics―Pedaling is the most efficient way of utilizing power from human muscles.  Pedal power enables a person to drive devices at the same or higher rate as that achieved by hand cranking, but with far less effort and fatigue.  The human musculature is concentrated in our legs and the bicycle set-up allows for harnessing the maximum output. Bicycle power Generator 5
  5. 5.  The practical option to implement for the bicycle system was to use an dynamo/alternator  Dynamos /alternators are equipped with permanent magnets.  They are typically claw-pole generators and deliver energy at rather low rpm. Alternator 6
  6. 6.  The voltage created by a permanent magnet motor is directly proportional to the rotating speed of the motor (RPM).  The scooter motors we use in our system are designed to provide a 24V output at 2850 RPM  In order to create a voltage constantly higher than 12V the motor must rotate at a speed of at least 1425 RPM.  How fast the motor rotates depend on: the speed the cyclist’s spinning legs (faster = greater motor RMP) Battery Charging 7
  7. 7. Bicycle power Generator 8 Item Cost [Rs.] 1 Bicycle 3500 2 600 Watt Battery 4500 3 300 Watt DC Generator 3500 4 Adjustable V-belt 500 5 12V Charge Controller 3500 6 Bike Trainer Exercise Stand 1000 7 Diods, Terminal Blocks & Wiring Kit for charge controller 1000 8 Miscellaneous hardware 500 9 TOTAL 18000
  8. 8. Bicycle power Generator 9 Q: How much power can a person produce? A: Kids under 12 can put out 50 to 100 Watts of power for an hour. An adult who works out every day can put out between 100 and 150 Watts of power for an hour. Someone who is a competitive cycler can put out up to 500 Watts.
  9. 9. 10 Thank you