Hand-Cranked Mobile Phone Charger

This Hand-Cranked Mobile Phone Charger uses a dual axial-flux generator to produce electricity.

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The Charger is powered by dual axial flux generator to convert mechanical energy to electrical energy. This type of generator was preferred over D.C. motor as it allows generation of electricity even at relatively low speed. Noise reduction is also achieved for this type of generator.

The mechanical energy is produced when the device is twisted and released. This is accomplished with the use of a torsion spring through which the torque is stored when the device is twisted. The twisting force will then cause the rotor of the axial flux generator to rotate which will then produce electricity. To store the generated electricity more efficiently, a super capacitor will be used.


         This project aims to address the need for portable charging in environments where no electricity from the power grid is available or even when solar portable charging is not applicable in an instance when a user is in a dense forest or in a cave. The device is intended primarily to travelers and explorers.


        The prototype was tested and it generated an average voltage of 20V for one stator only as some magnets were damaged during assembly. The prototype has two stators and one was not working since I was unable to procure the same magnets due to unavailable supply. 

Standard Tesselated Geometry - 49.20 kB - 08/19/2019 at 22:18


Standard Tesselated Geometry - 52.04 kB - 08/19/2019 at 22:17


Standard Tesselated Geometry - 96.27 kB - 08/19/2019 at 22:16


Spacer 0.5mm.stl

It prevents contact between stators and rotors.

Standard Tesselated Geometry - 70.20 kB - 08/19/2019 at 22:14


Standard Tesselated Geometry - 400.38 kB - 08/19/2019 at 22:13


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  • 1 × Brake Bar It enables the "Counter to Rotor 1" to engage/disengage with the Bushing.
  • 1 × Platform It holds the electronic components inside the Body Case.
  • 1 × Lock It holds all major components in place.
  • 1 × Cover to Rotor 1 It serves as cover to Rotor 1 and holds the "Counter to Rotor 1" in place.
  • 1 × Body Case It serves as a housing for electronic components and as a handle for the user when cranking.

View all 19 components

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Marvin wrote 08/25/2019 at 04:03 point

Though for now the development of this project seems to be slow due to my full time job and scarcity of my financial resources, I will continue this project. I'm also thinking of a design that will leverage the body weight for easier cranking of the rotor.

As for the extensibility of this project, the use of a torsion spring and a combination of gears, the concept could potentially address the problem of wind turbines facing low speed winds and hydroelectric at low volume of water.

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