Harvesting Waste Energy: Bicycle Power Generation RIT-MSD-I Detailed Design Review Winter/Spring P12414

Team Members Daniel Tobin (ME) ▫Project Manager Amina Purak (ISE) ▫Facilitator Aaron Sieczkarek (ME) ▫Chief Engineer Brenda Lisitano (ME) Zheng (Flora) Li (EE) GUIDE: Professor Brownell

Design Review Agenda P

One Page Project Summary 1.Project Background People in countries with inadequate infrastructure have an unmet need for electricity. A bicycle rotation energy harvesting system is a possible source for creating and storing power. This system could provide the energy required for light, communication, or water treatment by converting kinetic energy to electrical energy for small electronic devices. 2.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.

Customer Requirements

Specifications

Assembly

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

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 Non-linear oscillating voltage input Constant 5V DC output

Circuits Overview 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 12V AC Positive Output Positive Output in Range 5V DC Cellphone AC motor

Circuits Overview Additional Zener diode 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 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. The pin 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, all different kinds of USB 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 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

Selected Parts Specs

Cost/Worth Analysis

Calculations …

Shaft Attachment

Motor Attachment

Box Attachment

RPM Calculation

Risks

Test Plan

Example Test Sheet

Gantt Chart for MSDII

Concerns Next Steps

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