Thomas Mark
14th December 2018, 18:46
Hello everyone, I'm new member TCC, currently residing in Tampa Fl. I hope you all find my first post as interesting as I have found this forum and its members. Brown nosin aside I am working on a fascinating little project that I hope some of you will find interesting enough to help an actually very ignorant person.
A couple years ago I developed a drive method for a prime mover that is super efficient (plan to release it as open source in the near future). Me being who I am and matching my (very limited) abilities this device works via a physical dodge around a couple of our physical laws. Sadly anything to do with electricity and electronics is beyond me. Knowing this I went ahead and designed a linear generator that I could 3d print. You can see, from the pics in my linear generator album, the rigid frame holds sets of bar magnets. This rigid frame, the “shuttle” is a short throw linear generator with a total throw of only 25.5 mm, 12.75 mm from center in each direction. How it works is the shuttle travels back and forth around a coil laid flat. The shuttle has two levels of magnets spaced the thickness of the coil housing.
I saw benefits (allowed by the PM I designed) to having magnets on both sides of the coil so that's what I did. Each coil leg is the same width as a bar magnet. The shuttle only moves the width of one coil leg in each direction so for each full stroke a magnetic field passes completely over each coil leg, one positive and one negative. I believe that in doing this it takes advantage of the mirror field induced in the coil easing and maybe even helping the reversal of shuttle travel. Another benefit is doubled the mT count at the coils center. Right now this is just experimenting with a small scale and I designed this to run on a hand cranked flywheel, also 3d printed and impressive in its mass, 200mm diameter and 3.2 lbs with fine balance.
Right now I am just using two pairs of magnets and a single coil. Here are the specifics. Each magnet is one half by two by one quarter inch. They are held one half inch apart with the fields aligned through the levels, one pair north and one south. This gap where the coil resides gets around 210 mT at its center with 310 mT at each coil face. The coil is 480 turns of 26 awg and was wound on a core the same size (2x thick) and shape of the flat bar mag. At a relatively low cpm of 280 I am getting approx 1.8 volts in each direction, and now my question(s). Whats the best way to rectify a two wire coil so I am getting 1.8 volts of the same polarity from both stroke directions? Currently I have one coil wire split to two and attached to the outer inputs of a bridge rectifier. The other coil wire is attached to the center rectifier input. This works but is giving me identical output readings for both AC and DC on my meter. It brightly lights several led bulbs in both directions (blinks when direction changes) but I feel like something is not right.
Truly sorry I am so ignorant on what is probably pretty basic to a lot of you, sometimes I feel like the victim of my past self. I appreciate any and all input as I know nothing about this stuff. This things only design criteria was what would fit on my printer plate. My only consideration for the coil was its physical size then I just printed a bobbin and wound the coil with a wire gauge that I felt would work best, turn count was dictated by what would fit. Also I am happy to share stl. files with any who are interested, files are created on current version of TuboCad 2018 but I can convert to other formats if needed. As far as friction in this design it is very low. For anyone interested I use XT filament from Colorfab for my printed parts. It seems to have a very low drag coefficient with no measurable heat buildup and a very consistent shrink percentage when printed. I routinely design and print parts sized to two decimal places with that filament.
A couple years ago I developed a drive method for a prime mover that is super efficient (plan to release it as open source in the near future). Me being who I am and matching my (very limited) abilities this device works via a physical dodge around a couple of our physical laws. Sadly anything to do with electricity and electronics is beyond me. Knowing this I went ahead and designed a linear generator that I could 3d print. You can see, from the pics in my linear generator album, the rigid frame holds sets of bar magnets. This rigid frame, the “shuttle” is a short throw linear generator with a total throw of only 25.5 mm, 12.75 mm from center in each direction. How it works is the shuttle travels back and forth around a coil laid flat. The shuttle has two levels of magnets spaced the thickness of the coil housing.
I saw benefits (allowed by the PM I designed) to having magnets on both sides of the coil so that's what I did. Each coil leg is the same width as a bar magnet. The shuttle only moves the width of one coil leg in each direction so for each full stroke a magnetic field passes completely over each coil leg, one positive and one negative. I believe that in doing this it takes advantage of the mirror field induced in the coil easing and maybe even helping the reversal of shuttle travel. Another benefit is doubled the mT count at the coils center. Right now this is just experimenting with a small scale and I designed this to run on a hand cranked flywheel, also 3d printed and impressive in its mass, 200mm diameter and 3.2 lbs with fine balance.
Right now I am just using two pairs of magnets and a single coil. Here are the specifics. Each magnet is one half by two by one quarter inch. They are held one half inch apart with the fields aligned through the levels, one pair north and one south. This gap where the coil resides gets around 210 mT at its center with 310 mT at each coil face. The coil is 480 turns of 26 awg and was wound on a core the same size (2x thick) and shape of the flat bar mag. At a relatively low cpm of 280 I am getting approx 1.8 volts in each direction, and now my question(s). Whats the best way to rectify a two wire coil so I am getting 1.8 volts of the same polarity from both stroke directions? Currently I have one coil wire split to two and attached to the outer inputs of a bridge rectifier. The other coil wire is attached to the center rectifier input. This works but is giving me identical output readings for both AC and DC on my meter. It brightly lights several led bulbs in both directions (blinks when direction changes) but I feel like something is not right.
Truly sorry I am so ignorant on what is probably pretty basic to a lot of you, sometimes I feel like the victim of my past self. I appreciate any and all input as I know nothing about this stuff. This things only design criteria was what would fit on my printer plate. My only consideration for the coil was its physical size then I just printed a bobbin and wound the coil with a wire gauge that I felt would work best, turn count was dictated by what would fit. Also I am happy to share stl. files with any who are interested, files are created on current version of TuboCad 2018 but I can convert to other formats if needed. As far as friction in this design it is very low. For anyone interested I use XT filament from Colorfab for my printed parts. It seems to have a very low drag coefficient with no measurable heat buildup and a very consistent shrink percentage when printed. I routinely design and print parts sized to two decimal places with that filament.