Download
1 / 45
450 likes | 585 Views
Harvesting Waste Energy: Bicycle Power Generation. RIT-MSD-I Detailed Design Review Winter/Spring 2011-2012 P 12414. Team Members. Daniel Tobin (ME) Project Manager Aaron Sieczkarek (ME) Chief Engineer Amina Purak (ISE) Facilitator Brenda Lisitano (ME) Zheng ( Flora) Li (EE).
E N D
Harvesting Waste Energy:Bicycle Power Generation RIT-MSD-I Detailed Design Review Winter/Spring 2011-2012 P12414
Team Members • Daniel Tobin (ME) • Project Manager • Aaron Sieczkarek (ME) • Chief Engineer • Amina Purak (ISE) • Facilitator • Brenda Lisitano (ME) • Zheng(Flora) Li (EE) GUIDE: Professor Brownell
One Page Project Summary Project Background People in countries with inadequate infrastructure have an unmet need for electricity. A possible source for creating and storing power is a bicycle rotation energy harvesting system. This system could provide the energy required for light, communication or water treatment. • Problem Statement • Our goal is to transform kinetic energy within a bicycle into an electric power source intended to charge a cell phone. Our device is expected to be cheap to build, easy to install, maintain and use.
Location of Installation Analysis • The device will be designed to be installed on the back of a standard bike. • The back of the bike is much more standard with regard to angles of the bike frame. • There tends to be one horizontal tube and a tube that extends radially from the rear axel. • This choice will allow for a greater number of bikes to be used and have the roller turn linearly as the wheel rotates.
Spring Calculations SPRING
Motor Selection Voltage Output Testing on the MIT device
Motor Selection Voltage Output Testing on the Red Light Dynamo
Motor Selection Voltage Output Testing on the White Light Dynamo
Motor Selection Summary • Selected this motor because it provides DC output. • Cheap, small & lightweight. • 12V DC
Circuits Overview Circuit Diagram for the MIT Device The MIT device uses a 12 V DC motor, a 6V voltage regulator and a 470uF Capacitor. The circuit diagram is shown above. The function of this circuit is to stabilize the DC output from the DC motor and regulate it to a 6V constant output.
Circuits Overview • The voltage supplied by a USB port is nominally 5V. In practical, the output is between 4.75V and 5.25V. A constant DC output of 5V is needed for the design. Circuit Constant 5V DC output Non-linear oscillating voltage input
Circuits Overview • The testing on excising dynamos and products shows that the output of an AC motor is similar to a sin wave. Assuming that the output from the motor is a sin wave with 12V amplitude, 100Hz frequency, and 0 V offset. The first step is to use a Bridge Rectifier to rectify the output voltage. The output from the rectifier is always positive. The circuit diagram and simulation are shown below. As we can see, there is a voltage drop of . is the diode voltage. The Bridge Rectifier
Circuits Overview • The second step is stabilize the voltage output in a smaller range then it is regulated to 5V constant DC output using a voltage regulator. The circuit diagram and simulations are shown. Capacitor C8 and C9 are used to additionally stabilize the voltage.
Circuits Overview Overall Waveform of the simulations Positive Output in Range 12V AC Positive Output 5V DC AC motor Cellphone
Circuits Overview Additional Zenerdiode Circuit As shown in circuit above, a 10V Zener diode is added. The Zener diode does not affect the function of the circuit. It is used to prevent high voltage input damage to the voltage regulator. It is not necessary if the output of the motor is always lower than 25V.
Circuits Overview • At the end, after we get the 5V constant output. The output pins will connect to a standard A-type USB connector. Pins 1 and 4 will be connected to the positive 5V pin and the ground of the circuit. The data transfer pins will also be grounded. • Using the pin out below, variousUSB to cellphone connectors can be made.
Circuits Overview • In the design process, we decided to use a DC motor instead of an AC motor because of the price of the motors. The bridge rectifier is no longer necessary. • Assume that the 12V DC motor is used in our design. The output from the motor is approximately 5V DC voltage with ripples. The design shown below is used to regulate the voltage output. Circuit diagram for 12V DC motor
Circuits Overview Simulation of 12V DC motor with 12V motor output with ripples. Simulation of 12V DC motor with 8V motor output with ripples.
Circuits Overview • Assume the waveform below is generated by a person riding for 20s with two stops. • According to the simulation, the output of the circuit maintain at 5V when the motor’s output is between 6V to 12V.
BOM Mechanical Parts TOTAL for 1 Final Product: $12.42
BOM Electrical Parts TOTAL for 1 Final Product: $4.64 With accessories TOTAL for 1: $4.94 or $5.04
Haiti Top 10 Phones • To determine the best choice for USB to phone adaptors we contacted Digicel, the largest cell phone provider in Haiti (Our main country of interest). Most Popular Cell Phones • Blackberry Curve • Blackberry 8520 • Nokia C3 • Nokia 1616 • Blackberry Bold 6-10 Various Blackberry Cell Phones (use micro USB)
Ergonomics • Highly visible and intuitive design with feedback that reflects the current knowledge in the world • Simple, universal instruction manual on how to install and use. Should not use language, but rather effectively communicate with symbols/diagrams. • Placed Cell Phone on handlebars to allow for maximum visibility of phone and immidiete charging feedback via cellphone screen.
Concerns and Next Steps Next Steps • We will be taking all of the information gathered from the detailed design review and utilize it to make improvements to the project. • After we obtain permission we will order all of the required components before the break. Concerns • Additional calculations and simulations may be necessary based on feedback from the review. • Multiple prototypes may be required for testing. • Testing may take more time than initially allotted for.
