The littlest toroid that could

[Mephitus]

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.

[clickcell]

Nice picture.

Here's some hardcore winding action:

[Mephitus]

Thats a pretty hard core little winding.  Tiny little brushed motor? Would be cool to see in action.

[wraper]

Nice picture.

Here's some hardcore winding action:

What'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.

Thats a pretty hard core little winding.  Tiny little brushed motor? Would be cool to see in action.

There are no brushes, just coils switched. Rotor is on the outside.

[clickcell]

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.

[IanB]

Here's some hardcore winding action:

Placing 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.

[Mephitus]

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

[dr.diesel]

^ That is very cool, thanks for sharing.

For those pondering the click, lots of videos to go with his tiny motor projects.

[retrolefty]

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

 While 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.

[Artlav]

I found this thread on another forum with a guy making 2.5MM (and smaller) electric motors.

For the sake of the international folks, that's a one US cent "penny" coin and it's 19mm in diameter.

[T3sl4co1l]

https://en.wikipedia.org/wiki/There%27s_Plenty_of_Room_at_the_Bottom



I 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

[djQUAN]

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.

[ivaylo]

Yes, you beat me to posting a Maxon rotor. A thing of beauty....

[Psi]

[djQUAN]

Pager motors! I have some of those but none are broken so I did not have one to take apart

[Ian.M]

Back to the topc title, what about magnetc memory cores? see: http://ed-thelen.org/comp-hist/navy-core-memory-desc.html and yes that's right, they did actually use thousands of 1.27mm dia ferrite toroids.