Electro Bike

TeamName: Electric 5

Mission of the team: we take for granted the energy we use, every day we use it in a large quantity that we can’t understand. Our project, in addition to helping to reduce energy waste, helps us to understand that the energy we use every day is not obvious. 

Our project is based on a bike simulator that at the same time produces electric energy to maintain itself and to power other objects such as a fan. The energy will be produced through the action of an alternator that with the rotational energy of the rear wheel produces electricity.

Structure of the project (Components)

The structure of the project is composed of the frame of a bike to which the rear wheel has been removed; instead of the wheel, there will be a metal flywheel that will turn freely from the ground. The flywheel will be connected to the pedals via a single gear chain with the crown connected to the pedals and the sprocket that drives the wheel. On the opposite side of the flywheel will be placed the alternator, which will then be connected to a battery for storage (also useful since the production rate is not constant and the battery can be charged at different rates and give a constant output). The various devices that will be the load that will be connected to the battery. On the flywheel, there will also be a brake to limit the speed and therefore the production of electricity.

second version, update 9/12/19 we won’t need a flywheel anymore, we will have a system with 2 wheels, one attached to the bike as a normal wheel but without the tire and with a belt and one at the back with the same belt for connection between the two. The wheel at the back will be a similar if not larger dimension than the one at the front. The back-wheel will form with the alternator a single body composed by the alternator’s rotating part and the wheel structure. The amount of RPM we will need to produce the right amount of voltage will be around 90-100 rpm depending on the effeciency of conversion of the trifase bridge. The voltage produced will not be completely constant but it will need to be smoothed out by a leveller ( the one usually employed in solar panels) to make the output constant (around 14.5 v dc to charge up the battery).

Necessary materials 

  • Bicycle frame
  • Support structure and ground anchorage
  • Alternator 
  • Battery
  • Chain with crown, sprocket set and pedals
  • Brake
  • Monitor for simulation and display of parameters such as beat and speed
  • Speed sensor
  • Heartbeat sensor
  • Inverter

Minumum, maximum and definately achievable goals:

  • Minimum goal: produce enough energy to at least let the fan go
  • Maximum goal: being able to implement all the changes (sensors and accessories) and do the simulation
  • Definitely achievable goal: create the bike structure

Why we want to do this project

We want to do this project because we find it interesting to build the system to produce energy, using our knowledge. At the end of the project, the bike will produce energy in a fun and healthy way.