Science Fair Wind Generators Otherpower. Once you have something working, whether from fan power or wind power, youll need to take measurements. In many experiments, only the output voltage is measured. This gives a direct correlation to how fast the blades are spinning, but is only part of the story. Watts volts x amps are the important figure, and measurement requires a load. This article is part of ongoing Software For Geeks series. PuTTY is handsdown the best, free, and lightweight SSH client for Windows. I have provided lis. Professional Kohler Engine Rebuilding, Buildups and Modifications Where Science, Common Sense and Engine Performance Come Together This website was last updated 2217. Zimmer Launches comprehensive line of Puros Demineralized Bone Matrix DBM with Reverse Phase Medium RPM and Puros DBM Block and Strip Allografts. View our online catalog for Mohawk Finishing products, including leather conditioners, glazing stains, precat lacquers waterborne stains. The villains of the Power Rangers universe that appeared in the television series Mighty Morphin Power Rangers and the film Mighty Morphin Power Rangers The Movie. The amperes will be determined by how large a load you attach how many LEDs or light bulbs, for example. If you built a system good enough to charge batteries, your load will change with how full the batteries are. What you measure and how are dependent on the goals of your project. A digital or analog multimeter for volts and amps might be all you need. For an advanced project, you could even get a computer interfaced multimeter available at Radio Shack that connects to a PC for data logging In fall 2. Glen Hurd posted a very fun, educational, and simple tiny wind turbine design on the, and gave us permission to use it. Glens business is the manufacturing and wholesaling of custom LED lighting products and solar power systems. Thanks Glen This was a lot of fun. There was no stress about anything really needing to work, but it does It started as killing time with stray parts, and grew into a simple little mill that has potential for a nice paper and project about wind power, from permanent magnet power generation to blade design. Autocad Drawing Of Chain Sprocket. The 3 phase permanent magnet alternator is from a VCR. Only the bottom plate of the VCR was removed for the photo. Most of these motors are held in with 3 screws from the top, and are very easy to remove. First unplug the wires connecting the motors. The large disk on the front of the motor was held in place by magnets and a small plastic washer on the axle. Often the shaft can be pushed, removing the assembly as the washer slides down the shaft, but sometimes they need to be cut off. Save the washer if it comes off easily. There seem to be 2 common types of this motor. The bad motor is subject to very strong eddy currents in the metal backing plate, and is not very usable because as the RPMs increase the drag increases to an extreme amount. These motors are wired in 3 phase star, meaning the 3 phases are connected together in one place, and each of the 3 phases have the other end going out of the motor. An Ohm meter is needed to tell where the 3 motor output wires are located. The good motor in the photos has the common connections and output wires very easy to see and connect wires to. The traces or conductors on the circuit boards were scraped away with a utility knife, just to be sure no power was being fed to the circuits. The bad motor had 3 holes drilled to get the wires out the rear. Output wires are soldered to the ends of each phase. Dans note for a detailed explanation and diagrams of 3phase stator wiring, take a look at posting a look. Each phase has the same Ohm reading. This good one is about 4 ohms, so from the common to any output is 4 Ohms. From any output to any other output will be 8 Ohms. From any common to any other common is about 0. Now seems like a good time to show the lighting wires. Red LEDs light quite easily, and I recommend only red LEDs. Other colors need higher minimum voltages to light up, and draw more current. LEDs only pass current in one direction, but the alternator makes current back and forth Alternating Current, so each section needs a pair of LEDs connected backwards from each other. The resistor is to limit current so the LEDs do not burn out, but will have very little effect on the LEDs lighting up. LEDs also have the advantage of not conducting any current until they reach a certain voltage, and that helps get the windmill turning before there is a load dragging the speed lower. A regular light bulb will result in very poor, if any, operation. It can be fancy or simple, but the wires cannot touch each other where they shouldnt. After the soldering is done the large disk with the magnet ring is replaced and a quick spin of the shaft should light the LEDs Now onto the blades. Wooden rulers make simple blades. Part of the angles are ready to use I removed the metal strip, marked and cut off 3 1. The blades are sanded for a trailing and leading edge. A bench mounted sander will make things faster and easier. The root, or center, is not changed. The root angle is needed later for fastening to the hub. Ruler Windmill Blade. Toward generator. A hub holds the blades together and on the front of the alternator. It is not a motor any more This hub is a donut of wood 34 thick. Use smooth, good wood. The chip board in the photo caused some problems later. The center hole is as close to the pulley diameter as possible. A set of hole saws helps make the hub easier. The hub is marked with 3 lines 6. Each line is marked twice and small holes drilled for screws that will hold the blades. The blades are marked and drilled with a bit that is a little larger than the screw threads. Now the blades can be attached to the hub. The more accurate everything is done the better. The hub should now fit over the alternator, and the blades should look something like this. WINDSome rulers have a lower or higher angle than others. This set of blades has 2 layers of a business card under one side of each blade to increase the angle as viewed from the end. About 8 degrees seems like a good angle. After the blade angles are adjusted if they needed it, a bit of wood glue is a good idea. Now for the frame to hold it all together. This shows the main piece of wood with everything attached. The center is drilled for a 51. The bolt is placed in the hole, then a washer so it turns smoothly, then a tight nut. Next, another nut is screwed half way up the bolt. The end of the bolt, on the side, was smacked with a hammer to badly damage the last 3 or 4 threads at the very end, and the second nut was screwed toward the end until it is firmly held in place by the damaged threads. Then the alternator was screwed to the base. A suitable tail and tail boom were then assembled from scrap paneling and moulding, and attached. A good quality double sided foam tape holds the hub to the magnet rotor and shaft. That is why wood is better than chip board. The blade assembly is then slid back into the alternator. Next, blade balancing is needed. One side will probably come to the top, again and again, after a few slow spins. The top is the lightest side, and a little extra weight to that side will help the windmill run much more smoothly. A rubber band around the hub, holding a couple washers or maybe a nut, should show how much weight is needed and where. Norton Ghost Boot Flash Disk Usb For Sale. The weights can then be screwed to the hub. Dont rely on a rubber band to hold any weights, because it will not This tower is a section of 12 metal conduit. The photos show the 12 conduit inside a piece of 1 copper at the bottom because that is one of my test towers. The windmill nuts and bolt are simply placed in the conduit. This windmill can make about 8 or 9 volts AC per phase under a load of about 2. I have no idea what the RPM is at that time. These LEDs were placed in a half clear plastic tube in the first photo. The whole thing lights up very nice on a dark windy night. Red colored plastic red LEDs are hard to see lighting up in daylight. Water clear red LEDs show up when lit the easiest, by far, because as soon as they light they turn red The blades could be a little shorter, maybe about 1.