A.C. Line Filter

So maybe I should have posted this here all along.

I am trying to calculate the values for a AC mains filter.

I have some idea of what I am doing. I posted all the info in this thread on /g/:

http://zip.4chan.org/g/res/4014747.html#4016955

but I will post the info here in case one of you fine anons will help me.

I need a hand working out some calculations for an AC induction motor. I am trying to design a filter to reduce the harmonics to within the IEEE standards for North America.


I did measurements with a power quality analyzer, and it showed the third harmonic is twice the IEEE limit, which was about 8%.

I just want to make a simple two or three-stage mains filter. Some X-caps and Y-caps, and a couple choke Inductors. Where I need help is in the actual calculations.

I am using a bridge rectifier, but I am only using one of the diodes simply to create the harmonics I need to filter out. My instructor originally said to design a filter for the motor by itself, but an AC induction motor by nature does not really generate harmonics. So last week he puts a heater cone(approx 8Ohms hot with the 40V passing through) and this rectifier diode in parallel with the motor(but in series with each other), which generates some harmonics, and now I am supposed to design a passive filter to correct the situation. Assignment is fucking lame but I have to do it or I wont graduate.

I know it should be a LC harmonic trap filter, but I don't know the right values to use for the inductors and caps. Also, I am not sure how many stages it should be in order to complete this task.

I will provide any and all info as needed.

>with the 40V passing through

Lol fail.

>I wont graduate.

Yep.

Jeez, I know voltage doesn't actually 'pass' through. Would the voltage not be 40V in the parallel branch containing the heater cone and diode?

So I am not fucking perfect when it comes to AC motors. I want to learn. I still have time. If you are so smart, then please direct to me a resource that will explain this to me.

Thanks for the input though. Normally I might have been hurt by those words, but I have nothing left other than the possibility of graduating. Go ahead and hate me.

I can get back in to the lab to take measurements. I will measure the voltage across each component, as well as the current in each branch.

What else do I need to measure in order to complete this task?

If you help me I would greatly appreciate it.

It is great how some prick will put you down but not offer and help. I don't even know if I want to do this for the rest of my life, but I need this fucking piece of paper that says I accomplished something.

I don't need the exact answer, just guidance. It is obvious that I am lost and need a hand. I can get back in to take measurements tomorrow so if you want to stop being an asshole and help me I would greatly appreciate it.

I guess anon showed his true colours. Just wanted to pick out one little flaw and write me off. Thanks dude.

If you didn't want some prick to put you down why did you ask a question on the Internet? That's why I do it, it turns me on.

I asked on here because I have nowhere else to turn? Do you think I would be asking here if I thought there was an alternative? So far this has been a great help. Give me a hand, dude. I want to understand this, I really do. I will post all the information I have collected later tonight. Come back and check it out and see if you still think I am a retard. I am typing this in a hurry, and in a panic that I am going to fail. I am sorry if my thoughts are not being clearly expressed to you.

I guess you are better than I thought man, because you actually responded. I am not a bad guy. I help people as much as I can. I am selfless, and never make a big deal out of doing a good deed. I always try to pay it forward when someone helps me out. Thanks for not abandoning me man.

Any other anons want to help a guy out?

Sorry, I hated my power classes. They were all √3, while every thing else was √2. Digital is where it's at, simple stuff like 1+1=0.

Have you done *anything* to try to help yourself?

You didn't type "LC FILTER" into google?

1) Voltage is a potential difference across 2 points, it's not through anything.  Don't call this "one little flaw", it shows a fundamental lack of understanding.

2) What's a "choke inductor"? What are "X caps, Y caps"? Stop using slang like choke, start using correct terminology.  This will help with search engines and book indexes.

http://circuitcalculator.com/lcfilter.htm

http://www-users.cs.york.ac.uk/~fisher/lcfilter/

The second link practically does everything for you.

I recommend the book "art of electronics" by horowitz and hall.

Thanks you for the links. I will get into it tonight.

Fuck I was going quick when i said 'pass through'. I know voltage is the potential difference across two points. X-caps are meant for high power scenarios, and Y caps are to go across the line from hot to neutral in order to shunt spikes. I just wanted them in as a sort of protection, possibly with a couple MOV's(Metal Oxide Varistor) as well.

Ok I had read through those pages already. I cannot enter the information though, because I don't know the load impedance! I do not understand how to measure this properly, or how to determine it.

If you could help with this I would appreciate it.

WHOSE NAME IS GOING ON THAT FUCKING CERTIFICATE?

IT'S CALLED YOUR HOMEWORK BECAUSE, GET THIS, IT'S YOUR MOTHERFUCKING WORK

1: Draw the circuit
2: Label the circuit
3: Make a neat list underneath of the labels
4: Make a neat list next to each label of the information that you have
5: Make a list somewhere else of the information that you need
6: Search for formulas for that information
7: Transpose formulas if needed
8: CONTINUE DOING THIS
9: Profit

>>14
you forgot
[quote]8.5: ???[/quote]

>>14

That shit sounds just crazy enough to work, thanks anon.

and maybe it does too

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