The littlest toroid that could - Page 1
Forum section: electronics / general

author: Mephitus
author_rank: Regular Contributor
timestamp: July 16, 2015, 06:05:43 pm
content: I was in the process of repairing a bluetooth headset and found this cute little guy in with the negative line of the speaker. I have been reading way too many childrens books to my son, as the first thing I that came to mind was some kind of childrens EE book about the little toroid saving the day.

author: clickcell
author_rank: Contributor
timestamp: July 16, 2015, 06:14:03 pm
content: Nice picture.Here's some hardcore winding action:

author: Mephitus
author_rank: Regular Contributor
timestamp: July 16, 2015, 06:42:28 pm
content: Thats a pretty hard core little winding.Tiny little brushed motor? Would be cool to see in action.

author: wraper
author_rank: Unknown
timestamp: July 16, 2015, 06:54:36 pm
content: Quote from: clickcell on July 16, 2015, 06:14:03 pmWhat's hardcore? Quiet easy to wind actually (most of the motors are much more complicated to wind). Looks like the motor from the VCR head.Quote from: Mephitus on July 16, 2015, 06:42:28 pmThere are no brushes, just coils switched. Rotor is on the outside.

author: clickcell
author_rank: Contributor
timestamp: July 16, 2015, 06:57:29 pm
content: That came from a CDROM, the metal looks sheared as if I snapped it off, but I can't remember, I found it in a drawer where it must have been for years before I thought to photo it.

author: IanB
author_rank: Super Contributor
timestamp: July 16, 2015, 07:09:47 pm
content: Quote from: clickcell on July 16, 2015, 06:14:03 pmPlacing a ruler in the photograph next to the object is always valuable to understand the scale. Without a scale there is no way to tell how small (or large) an object actually is.

author: Mephitus
author_rank: Regular Contributor
timestamp: July 16, 2015, 07:44:10 pm
content: While attempting to find just how small people have made electric motors, I found this thread on another forum with a guy making 2.5MM (and smaller) electric motors. And a tiny 8mwh lipo battery.http://www.westknoxrc.com/index.php?topic=625.0

author: dr.diesel
author_rank: Super Contributor
timestamp: July 16, 2015, 08:12:00 pm
content: ^ That is very cool, thanks for sharing.For those pondering the click, lots of videos to go with his tiny motor projects.

author: retrolefty
author_rank: Super Contributor
timestamp: July 16, 2015, 08:15:35 pm
content: Quote from: Mephitus on July 16, 2015, 07:44:10 pmWhile not a commercial product, I recall reading (and seeing a picture) of a magnet motor built in research lab that could only be seen with help of a microscope, and this was in the 50s sometime.

author: Artlav
author_rank: Frequent Contributor
timestamp: July 16, 2015, 09:40:31 pm
content: Quote from: Mephitus on July 16, 2015, 07:44:10 pmFor the sake of the international folks, that's a one US cent "penny" coin and it's 19mm in diameter.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 17, 2015, 01:51:11 am
content: https://en.wikipedia.org/wiki/There%27s_Plenty_of_Room_at_the_BottomI don't know what the smallest magnetic machine is today, but MEMS uses quite a lot of electric motors. Accelerometers oscillate and measure springboards with electric fields; DLP use movable mirrors; etc.Tim

author: djQUAN
author_rank: Frequent Contributor
timestamp: July 17, 2015, 05:27:30 am
content: Speaking of cool windings... Here's a Maxon motor with an ironless rotor. I got it broken so I took it apart to see how it was built.The rotor is self supporting and the magnet (silver cylindrical object at the background) is alnico and sits inside the rotor.

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 17, 2015, 06:52:59 am
content: Yes, you beat me to posting a Maxon rotor. A thing of beauty....

author: djQUAN
author_rank: Frequent Contributor
timestamp: July 17, 2015, 08:14:51 am
content: Pager motors! I have some of those but none are broken so I did not have one to take apart

author: Ian.M
author_rank: Super Contributor
timestamp: July 17, 2015, 11:04:54 am
content: Back to the topc title, what about magnetc memory cores? see:http://ed-thelen.org/comp-hist/navy-core-memory-desc.htmland yes that's right, they did actually use thousands of 1.27mm dia ferrite toroids.