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Gravity, mechanical advantage, electromagnetism

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  • #1

    Gravity, mechanical advantage, electromagnetism

    Hi, I started this project last year. The plan is to use a set of electromagnets to drive a double bob pendulum, that drives a overrun clutch to a gearbox and flywheel. Once it running than I can drive a PMA with MPPT circuit. This not a OU project. The electromagnets will only be triggered for a short time and power generated will not exceed the power that is available at the output shaft. The MPPT circuit will limit the load current and prevent system stall.

    https://www.youtube.com/watch?v=fp3-...ature=youtu.be

    https://www.youtube.com/watch?v=B3dLzZZ5jKQ
    Last edited by Burnit0017; 09-21-2014, 05:43 PM.
    Tags: None
  • #2
    nobody can see your 1st video, its marked private



    Whoops

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    • #3
      Thanks, hopefully I solved the problem.

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      • #4
        I like that gearing!! Did you make it yourself or is that supply item?

        Nice work.

        Matt

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        • #5
          Hi, thanks . I have a small CNC router and I use GearGenerator3 to create the gear patterens. What is the relationships of flywheel, I am not sure if I should make the diameter of the flywheel smaller??? Suggestions welcome.

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          • #6
            Larger (Radius and weight) flywheels carry more energy. Thats your choice based on the performance of the machine.

            Nice work on them gears. LOL you got me thinking. Thanks

            Matt

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            • #7
              https://www.youtube.com/watch?v=TDmv59p1XkA

              Hi, I fabricated 4 electromagnets. The plan is the more weight on the pendulum the more torque, at some point the RPM's will remain constant. The eMag will be mounted on a long lever for max mechanical advantage. I can adjust the duty cycle of the MPPT circuit to limit the load current, this will prevent system stall. I will have to play around with the system parameters and possibly add another pendulum and overrun clutch. Thanks for the info. Please let me know if you start a project, thanks again.

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              • #8
                https://www.youtube.com/watch?v=0TE38SOdf64

                Video explaining why a MPPT is needed.

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                • #9
                  Very good video, poster does a great job explaining the problem. He seemed to have plans on selling his board 2 years ago but has gone quiet since then. Maybe the reason is that there are already many different brands available for sale. I never even heard of MPPT's till now.

                  Yours is a thought-provoking build also, although it's a bit hard to visualise it in operation. Those electromagnets seem heavy-duty - what kind of output power are you aiming for?

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                  • #10
                    Hi, I only know of two US manufacturers that offer a MPPT controller that will work with a PMA. MorningStar and MidNite Solar. I fabricated my own. Basically without the micro it is a DC to DC step down converter with a variable duty cycle. Solar MPPT controller will not work with a PMA.

                    https://www.youtube.com/watch?v=B3dLzZZ5jKQ

                    I had the same results. Without the circuit I could not manually turn the PMA.

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                    • #11
                      Hi, basically I am fabricating a smaller version of the video.

                      https://www.youtube.com/watch?v=HN4mBojjI_Q


                      Basically the plan is to get it operational without generating electricity. Then I will then try to adjust parameters accordingly. I was able to fabricate the electromagnets. I am not sure how much force they will create. I just have a general idea and I will know more in the future. It may require a voltage multiplier circuit. It is the best answer I can give at this time.

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                      • #12
                        Nice work

                        Hi Burn, The thing about all these things is they all seem to find a resting spot.
                        artv

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                        • #13
                          Hi, I understand what your saying, the electromagnets will prevent that from happening. And the MPPT circuit will prevent system stall. At least that is the plan.

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                          • #14
                            Originally posted by Burnit0017 View Post
                            Hi, basically I am fabricating a smaller version of the video.

                            https://www.youtube.com/watch?v=HN4mBojjI_Q


                            Basically the plan is to get it operational without generating electricity. Then I will then try to adjust parameters accordingly. I was able to fabricate the electromagnets. I am not sure how much force they will create. I just have a general idea and I will know more in the future. It may require a voltage multiplier circuit. It is the best answer I can give at this time.
                            Nice video, shows the general principle really well. In this video the pendulum has 2 weights, whereas a newer video shows you manually swinging a 3-weight pendulum - do you reckon that the 3-weights will be more efficient?

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                            • #15
                              Hi, the third arm is just for manual operation and possible drive location. The two arm configuration is so only part of the potential energy is transferred.
                              This is a first attempt and suggestion are welcome.
                              At light manual operation, output shaft RPM is about 500. Starting to mount PMA.

                              https://www.youtube.com/watch?v=9Sbq...ature=youtu.be
                              update

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