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  • You NEED DC coupling, else you are not going to get correct power readings. For example, if you choose AC coupling to measure a battery running a 300W load and your scope is going to show about 0 power! So is this battery now just free energy? Obviously not.

    If there are any DC biasing in that circuit, it will not show up with the AC coupling mode. And DC biasing can obviously transfer power.

    Though I think there is still something to your circuit Luc..... your generator and Watt Meter still did not show any power drain while powering your sizable resistor load. But you want to make sure you do the scope measurements as correctly as possible. Looking forward to your new measurements.

    And there is no reason to invert that channel 2 as some people try to tell you.... that is just pure nonsense!!!

    Keep up the great work.

    Originally posted by Mario View Post
    Hi Luc,

    I'm not an expert, but why should it not be set on ac? Also, if I recall correctly from your tutorial when you ran the circuit from the generator the wattmeter was showing the same energy consumed (or returned) the scope was showing.

    regards,
    Mario

    Comment


    • Hi Luc, I have been following along with your work and believe that you are truely onto something here.
      I know this thread is about reactive power but I would just like to chime in about the battery charger as I keep seeing it popping up all over the place in different threads.
      I have been using this configuration for some time now but it is my opinion that people are using too high of amperage and too high of capacitance. I have been using this type of charger in series on the output of both a joule ringer and a flip flop inverter using very small capacitance. Both work very well for charging pretty much any type of battery from a AA lithium or alkaline up to the lead acid battery in my skid loader at the now outside temperature of minus 23 farenhieght. There is no heat created in the batteries at all and I should mention that either circuit will light multiple 120 volt LED bulbs at the same time. The DC from the bridge rectifier puts out close to 300 volts but is locked at battery voltage when connected to a battery.
      Again I know were looking at reactive power here in the bigger picture but if you want a good charger for your batteries I would consider one of these circuits.

      Comment


      • Thanks for your posts guys

        I'm not dropping the research but closer to have reliable power calculations.

        About the Inverting. I know it's not necessary but I'm starting to understand poynt99 point. By looking at both you should have the opposite numbers (from + to -) By using this you can quickly double check if everything is well balanced in the math power calculations, I now see my scope math seems to be a little out of calibration. So this is a good lesson.

        I will continue the tests.

        Luc

        Comment


        • Originally posted by gotoluc View Post
          Thanks for your posts guys

          I'm not dropping the research but closer to have reliable power calculations.

          About the Inverting. I know it's not necessary but I'm starting to understand poynt99 point. By looking at both you should have the opposite numbers (from + to -) By using this you can quickly double check if everything is well balanced in the math power calculations, I now see my scope math seems to be a little out of calibration. So this is a good lesson.

          I will continue the tests.

          Luc
          Sounds like progress, Luc! anything that gets closer to "reliable power calculations" - please let us know what you come up with.
          Thanks for your posts and your honesty.
          Steve

          Comment


          • I have just made a document on what I call "Meta Quantities" that can be found at my google site https://sites.google.com/site/nilrehob/home/documents that might give some new ideas on "Reactive Power" and also on what I call "Reactive Impulse".

            /Hob
            Hob Nilre
            http://www.youtube.com/nilrehob

            Comment


            • Luc, et. al:

              I ran across this recently : http://users.ece.utexas.edu/~grady/POWERFAC.pdf

              Might be a good review of the effects of THD in Power Factor (and possibly in thinking about low-pass filters vs shunting) in your efforts.

              Regards
              Resonance to all !

              Comment


              • Hi all,

                just wanted to post the links to these two vids, too bad it's in spanish but we may still see what's happening...

                Generador Asincrono - YouTube

                Generador asíncrono - YouTube

                regards,
                Mario

                Comment


                • Originally posted by gotoluc View Post
                  Here is something interesting

                  Reactive Battery Charger at 36vdc - YouTube

                  Luc
                  Reactive Charging/Lighting with System off 090114 - YouTube

                  Same set up 344 vdc open circuit voltage fast charger

                  Comment


                  • Can anybody say,"whats going on in that pile wire?"

                    I guess Not?

                    Matt

                    Comment


                    • hello everybody

                      The world, attending in the debate . You will your succeed or not? That's the question. I personally do not want to get in a dispute (do not speak English), I just want to say that I, at a lower level, I tried without Oscilloscope current probes without alterntive or continue, to put into operation this circuit. How do you like it:
                      https://www.youtube.com/watch?v=mjT6SsRdU_8




                      I am Cristian Alba and today I continue with another part of the project - Reactive power research-
                      This is my progress in the project <Reactive power research <


                      I got a motor, servo garage door 110 watts, a home generator building, a servo motor 400w magnetic rotor, a 7.70 mf capacitor tank, one 11w the lamp and a power meter
                      Ok we check the motor powered directly from the mains and is easily observed that consumes 110w.
                      we check and note the power consumption same motor without generator . Now we check the generator and motor power consumption shown. Ok, if you connect the 11wati lamp, note a slight increase in consumption. https://www.youtube.com/watch?v=VLiEwfrxX7w
                      That's all for now and thanks to Luc Choquette for opening this topic.

                      Comment


                      • @Mr. Alba, Thats a good setup. Nice work.

                        @ Luc I have been reading everything on measuring that load, but I realized I do not even know what math you are using in the tutorial. Did you, or Can you explain the exact process in your scope? I understand the hook up, and what formula I think should be used for apparent power, So I am just wondering what your using.
                        I am really confused on the IN/OUT part too.
                        Thanks
                        Matt
                        Last edited by Matthew Jones; 01-11-2014, 01:35 PM.

                        Comment


                        • Originally posted by LutherG View Post
                          Hi Guys,

                          Take a look at this patent: US 2008/0297134 Circuit for Transmitting an Amplified Resonant Power to Load... there may be some concepts we can apply here.

                          Best regards to all,

                          Luther


                          /Hob
                          Hob Nilre
                          http://www.youtube.com/nilrehob

                          Comment


                          • Originally posted by Matthew Jones View Post
                            @Mr. Alba, Thats a good setup. Nice work.

                            @ Luc I have been reading everything on measuring that load, but I realized I do not even know what math you are using in the tutorial. Did you, or Can you explain the exact process in your scope? I understand the hook up, and what formula I think should be used for apparent power, So I am just wondering what your using.
                            I am really confused on the IN/OUT part too.
                            Thanks
                            Matt

                            Hi Mat
                            It is not any complicated math, and do not see why you're confused. It is very simple:
                            I avoided complications with measurements and oscilloscope probes, because it seems like we do not see the forest for the trees. Too many comments without object, so long, when things need to be much simpler:
                            I used a motor without starting winding (capacitor between two phases) = 110w...
                            a generator of a motor rotor cage changing one 6-pole magnetic
                            Putting into working
                            I connected the motor directly to the power meter and the result was 110w
                            I conctat in the second step the motor through circuit tank capacity, and the result was 50-51 watts. What must be explained is that I used the motor winding inductance and the adjustment that we made ​​it through starting capacitors
                            According to the label it has 100w motor factory, but because of the two tuning capacitors start I take the result before connecting the circuit 110 watts exactly what you see on PowerMeter
                            It proved to be an entry in resonance happy after a long string of failures
                            Now I'll try a leveling of the two reactance of(cap + generator windings inductance)
                            generator, but be very difficult given that at 127V per phase, the measured frequency is 115-120Hz
                            Okay, I know what I'll say: the reactive power in the network alimentare.Ok returns if we think long term and we obtain a closed loop, where the reactive power back?
                            Me please excuse the inaccuracies in expression but do not speak English
                            Regard

                            Comment


                            • I just want setup the scope so I can look at ratios of capacitance to returned power. I am sure a watt meter will tell me if I am on the right track I just wanted to pull more detail.

                              Thanks
                              Matt

                              Comment


                              • Originally posted by Matthew Jones View Post
                                I just want setup the scope so I can look at ratios of capacitance to returned power. I am sure a watt meter will tell me if I am on the right track I just wanted to pull more detail.

                                Thanks
                                Matt
                                Ok Matt, I understand
                                I just did wide response, beyond >

                                Comment

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