User:Pbarring9583/ENES100/Project 3

Project Preference
1. Beat Bearing

2. Wireless Electricity

3. Shaker Table

Week 1 Narrative
For this first week of our project. I wasn't able to contact with any of my group member and assign tasks because of the spring break. So, i tried finding new existing designs of wireless electricity. I found this website "http://hackaday.com/2013/02/13/wireless-light-bulbs-with-a-slayer-exciter/" The video on this website was pretty cool. This website doesn't explains alot about how everything is connected and what things are used; however, we can make something like that to see if it works. I also find this another interesting idea "http://www.instructables.com/id/Teslas-Candlestick-Wireless-Electricity/". This website also explains the steps and things we need to use to test it. I will try testing this idea with my group and see if it works or not.

Week 2 Narrative

 * My task this week was to lean about the coils and how they work. Through my research I found some websites that has a lot of information about how the coils work. I found that, the more turns the coil has, the stronger magnetic field will be produced through the coil. Other thing to consider is that both of the coils should be same size and should have same number of turns.


 * Resonance

-When magnetic waves of particular frequency are absorbed by some object, resonance occurs making that object resonate. The frequency that resonate the object depends on it's molecular structure, shape and size of the object. The frequencies of resonate work from 150KHz upto 10MHz.

-Resonance is very important part in coils to make wireless electricity. Both of the coils should be resonant at the same frequency to pass the current through them. It also make wireless electricity more efficient. If the coils are not resonated at the same frequency, the current won't pass through the coils and it won't work. Inductor and capacitor are also important to put to create resonance. These are the things that our group should consider for next time while testing this project.


 * These are few websites I found information on

http://www.instructables.com/id/Wi-Tricity-Wireless-Electricity-1/

http://inventors.about.com/od/estartinventions/a/Wireless-Electricity.htm

http://news.softpedia.com/news/How-Wireless-Power-Transmission-Works-86040.shtml

http://www.cornellcollege.edu/physics/courses/phy312/Student-Projects/Magnetic-Resonance/Magnetic-Resonance.html


 * My other task was to do testing with my group. My group and I tested the idea we found in last group on this website" http://www.instructables.com/id/Wireless-L-E-D/". We had all the materials we needed to test it except the 330 microhenries inductor. So instead we decided using 3 100mh inductors connected in a row. When we connected everything and checked the Voltage with the voltmeter, it was doing some crazy things. As we connected the battery to our setup, the current jumped up to 11 volt and dropped down to 1 volt and then it jumped up again. It kept on jumping up and down. When we took out one of the 110mh inductors and checked again, the current stayed stabled at 0.40 voltage which was very less for coil to transfer. We were confused that why it was happening, but we the main problem was in inductor, that didn't gave us any success. This is a picture of how we connected everything. The only thing not there is the inductors.



Week 3 Narrative
For this third week of our project, we didn't had any tasks signed up. It was because my group and i didn't knew what to do, we have already learned about all the things we are using for this project. Nothing is working as we expected it to work. We are stuck at very hard point, we don't know where to move or what to do next. So, instead of wasting more time on just research, our whole group decided to work together on the Idea we already had and test it with different coils.

Materials

1. (1)33 k Resistor

2. (1)2n2222a Transistor

3. (3)100 Uh Inductor (we used 3 of them because we needed 330 Uh in total)

4. (1)100 P Capacitor

5. (1)Red LED

6. 11V Battery

7. Two copper coils

Circuit of our Idea


 * First the positive end of battery is connected to one end of 33K resistor, 100 picofarad Capacitor and coil, the other end of 33k Resistor and 100p Capacitor is connected to the middle leg of the transistor. one side leg of transistor is connected to the other end of coil. The other side leg of transistor is connected to (3) 100Uh inductors, which are connected to the negative end of battery. On the other side, both legs of LED are connected to the both ends of coil.

First Try


 * My group and I worked on the idea that we found on week 2. By following the instructions we did everything correct. This time we got some of the success, but not fully success. We were able to pass the current through the first coil, but the receiver coil wasn't getting any voltage. We didn't knew why the receiver coil wasn't receiving any current. We used all the information we learned in our second week, but nothing worked.



Second Try


 * As I learned last week that the more turns the coil has, the more stronger the magnetic field is, so we decided to make more turns of coil In this one, the circuit was same as the last one, but we changed the coils for this one. For this coil, we took a round shape object of 2.5 inches and turned the copper coil around it, this time we made 5 turns of both of the coils. This idea also didn't worked and the receiver coil still didn't received the current.



Third Try
 * After we failed with both of the ideas we asked our professor for help. He gave us a big coil to use that had a lot of turns and asked us to make the receiver coil by ourselves by using the long copper wires. We tested this coil, but this coil also didn't worked at all.




 * None of our ideas worked, so we went to our professor again for help. He told us that we should check if the magnetic field is passing through the coil. It is important for first coil to create a magnetic field to pass the current to the second coil. He gave us a device to checked the magnetic field. We checked the magnetic field of our third idea with a large coil. The large coil was producing 0.3931mt of magnetic field. We didn't knew if it was enough for receiver coil to receive current. We told our professor about it, he said that it is similar to a magnet that he tested first.



Week 4 Narrative
My task this week was to find a new circuit and test it. First I thought to make our own circuit, but none of my group members were actually familiar with electricity circuits very well. So we thought that instead of wasting time on building our own circuit we should find something online, so that it will be easy for us to work on. I did a lot of research with my group during the week, but we couldn't found any reliable source that can give us a correct circuit that would work. We also tried working with our old concepts. We tried changing around the circuit and used different coils, but it didn't worked. All the other circuits we found before didn't worked as we thought it would. Over the weekend i did more research so we could find something. Through my research i found a really good website that doesn't just give the circuits, but also explains about everything we use in the project and also explains about how everything works. This information will be good to learn and may help the next group to build their own circuit.

Circuit




 * This is the new circuit diagram i found through my research. We weren't able to test it because this was our last week and we also had to work on CDIO reports, so we didn't had enough time. This will be helpful for the next group and may give them some more success.

Links to Helpful Videos and Websites


 * Link to the website that explains everything about wireless electricity "http://www.vk2zay.net/article/253"


 * http://youtu.be/r1UT4NuygmQ


 * I also found this website that explains about how to do resonant coupling in a proper way, this is so important. The magnetic field and it's strength depends on it. This will help to do the resonance of coils properly and may lead to success. "http://www.wirelesspowerconsortium.com/technology/resonant-coupling.html"

Equations


 * I also found one equation for coils. This will be very helpful. This equations tells about the size and turns of coil. It is kinda hard to understand. But if we work on it, it may get easier to understand.

Inductance(µH)= (rn)^2 / 22.9 r + 25.4 l

L = inductance (µH)

r = mean radius of coil (cm)

N = number of turns

l = length in cm

N = 6 turns

r = 3.5cm

l = 4cm

L = 2.42μH

C= capacitance

f= 1/2π Squareroot of LC = 13.56MHz

C = 56.9pF