Inductive Flyback

[@marcfruchtman9473]

Great video. Thanks for a very good explanation.

[@jtodora]

Glad it was helpful!

[@shashikiran05]

Great video!! This is exactly what I was looking for. It was very helpful. I just one question though. Why do we need to mount the protection as physically close to the inductor as possible? Doesn't the current through the diode(protection) get affected by the flux linked to the inductor?

[@jtodora]

Wire that has current flowing through it has a small amount of inductance. Then, when wiring is laid in a wire way (trough), along with other wires, there are other added effects, such as when two or more wires are laid next to each other and current is flowing, think about what you just created. Wire is a conductor wrapped in an insulator. When two or more wires are laid together, each is a conductor separated by an insulator. [Umm...two or more conductors separated by an insulator (dielectric); hey...that forms a capacitor]. All this added inductive and capacitance can create coupling (cross talk) between conductors. The flyback could be coupled to other circuits through this LC coupling action before the diode has a chance to fully squash it. When I create these videos, I assume I'm talk to a general audience. I don't know the application they are using and therefore I always lean toward the safest way. Naturally, if you only have one or two inductive loads and there are not a lot of other devices and wiring in the wire ways, placing the diode as close to the inductor is not [as] important. However, in control cabinets with a lot of components and a lot wiring, there could be enough crosstalk to create problems with other devices in the cabinet. I hope this explanation helped. Thanks for the compliment. I'm glad it helped. If you can and haven't already, please give the video a thumbs up. KZbin looks at the thumbs up and raises the video higher in the search list. I do not monetize the channel. I do these videos as a pay forward to all the excellent engineers who shared their knowledge and expertise with me during my 43-year career.

[@shashikiran05]

@@jtodora I hadn't thought of a complex wiring scenario where the 'crosstalk' happens. Thanks for the input. Helped me a lot. You're doing good work out there. Cheers! :)

[@BoyanAtanassov]

Why nobody views the collapsing stage of an inductor as a GENERATOR who's energy can be harnessed to do useful WORK? Why everybody is trying to get rid of the Spark by directing the current through a Flyback Diode? Why not harness it in a High Voltage capacitor and make a Voltage pump out of it with a diode stopping the capacitor from discharging? Why nobody asks how come a Coulomb of charge having 1.5 Joules per Coulomb of potential energy all of a sudden has 300 Joules per Coulomb of Energy? Where did this energy come from? Can it be that the amount of Energy that goes into the inductor building the magnetic field up to saturation is LESS than the Energy Generated by the inductor during its Collapsing stage? Can you make a video on this topic? If you flip the hinge of the switch to be on the inductor's side so that when you disconnect it from source you automatically close a second circuit loop with 1 Ohm resistance - how much heat will be dissipated in it? Instead of resistor one can put a fuse and if it get's burned out, this will attest for a certain amount of current flowing though the fuse in a very short time... Say voltage on the coil at beginning of collapsing stage is 300V - you route this through 10 Oms - Power equation P = V^2 /R so we are talking 300^2 is 90'000 / 10 = 9'000 Watts? The question is - does the rate of change of collapse determine the voltage on the inductor or is it that the infinite resistance of the switch and Om's law cause the High Voltage on the inductor? The second one doesn't make sense as the current through the resistance is the effect and the voltage on the coil is supposed to be the cause... I think a video on this subject will be awesome!

[@jtodora]

Thanks for watching and replying. Although you bring up some very interesting points, the intent of the video is for maintenance people working in the field of industrial automation. When inductive loads are wired to a PLC/PAC or any type of solid state controller, the inductive flyback can, and will fry the output switches. This causes down time of the manufacturing machinery and a loss of production. Therefore, the flyback is a bad thing in this application. It also sounds like you've been reading and researching some of Tesla's work and seem to be more versed than me on the topic. Thanks again.

[@BoyanAtanassov]

@@jtodora Is there a chance I can send you a video of my home experiment...

[@jtodora]

@@BoyanAtanassov Sure. I don't know if I will be very useful to you but I'll gladly watch. Do you have a KZbin channel? If not, you can send it to [e-mail] Please be sure to identify yourself in the subject line so that I don't just delete it thinking it's garbage.