Video Tutorial and Experiments on Magnetic Levitation [The Signal Path] - Page 1
Forum section: electronics / projects

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 28, 2013, 02:43:27 pm
content: In this episode Shahriar demonstrates one of the simplest magnetic levitation circuits. First, the basic concept of magnetic levitation is examined. Two different methods of detecting the location of the levitating object is presented and the Hall effect sensor method is chosen. A semi-digital overall system is implemented where a PWM control IC is employed to control the magnetic field strength. The block diagram and functionality of this IC is presented. Finally, the schematic of a dual-Hall effect sensor solution is presented. The circuit is built and tested in both open-loop and close-loop configuration. Magnetic levitation is demonstrated with the capability of adjusting the levitation location. The schematic of circuit can be downloaded from The Signal Path website.Watch the video here: [36 Minutes]http://thesignalpath.com/blogs/2013/01/28/tutorial-and-experiments-on-magnetic-levitation/More videos at:http://www.TheSignalPath.com

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 28, 2013, 02:47:41 pm
content: Awsome video. This look like a project I would like to do and play with.Robert

author: firewalker
author_rank: Super Contributor
timestamp: January 28, 2013, 02:49:35 pm
content: I had used only opamps, a logic level mosfet and a coreless coil for this once. I think is the project that every one has built once.Alexander.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 28, 2013, 06:08:07 pm
content: Quote from: firewalker on January 28, 2013, 02:49:35 pmAnd I think it is a project everyone should build once. There is just so much reward in seeing the magnet levitate and even more reward in understanding how the whole thing works!

author: Tooms
author_rank: Unknown
timestamp: January 28, 2013, 07:19:09 pm
content: Awsome video.thanksTooms

author: JSnyder
author_rank: Contributor
timestamp: January 28, 2013, 07:24:30 pm
content: Excellent video as usual! great physical representation of the abstract idea of PLL's~Jon

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 28, 2013, 10:09:47 pm
content: Quote from: Tooms on January 28, 2013, 07:19:09 pmThanks!

author: Harvs
author_rank: Super Contributor
timestamp: January 29, 2013, 12:08:02 am
content: Great video once again.Your channel is one of the very few that when a video is released I know there's going to be something entertaining (and usually educational) that's worth watching. I appreciate the effort that goes into creating that.Cheers

author: ve7xen
author_rank: Super Contributor
timestamp: January 29, 2013, 09:28:34 am
content: Excellent video as usual Shahriar. I really appreciate your work, you've found an excellent balance of depth and conciseness for me that I haven't seen in many other places, and you're entertaining and choose interesting topics as well. Keep it up, and stick with this niche.Thanks

author: jahonen
author_rank: Super Contributor
timestamp: January 29, 2013, 09:43:20 am
content: It would have been interesting to try measuring the plant/loop gain and design a frequency compensation for the error amplifier, to me it looked like that the loop actually oscillates around stable working point (PWM going to zero and then back to full duty cycle again).Regards,Janne

author: deephaven
author_rank: Frequent Contributor
timestamp: January 29, 2013, 09:46:52 am
content: I very much enjoyed yet another professionally presented and interesting video. Thanks Shahriar.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 29, 2013, 05:46:06 pm
content: Quote from: jahonen on January 29, 2013, 09:43:20 amIt is definitely an interesting exercise to measure the open-loop response gain. It would be a little tricky because one has to account for the PWM behavior and create a linear model for it.