🎉We can now proudly present the winners of the TAPAS Community Challenge 2018! 🎉
Congratulations to Team "Wireless Charging" (idea 56). We are really excited for all finalists and a really big thank you to all participants for your interest in this challenge!

We got over 200 submissions! 65 ideas got one or more TAPAS boards, 10 submissions were presentation-ready.
And now we have 5 finalists! YEAH 😃 The finalist's idea numbers were 40, 56, 68, 212 and 213.
What's next?
We are now preparing the next steps for you, the community. Please stay tuned!
We are working on a forum and a separate webpage. If you have any question please don't hesitate to contact us via email!

Non-rotating drive

A BLDC motor takes advantage of the mechanical balance between a set of coils and magnets to control the movement of the magnetic armature - pulling harder on one couple while releasing the force on another so that both speed and position can be controlled. This is normally used to provide constant spin or, in the case of a linear motor, constant position control in one linear axis.

There are, however, other configurations where the same balance of opposing forces can occur but without linear or rotary motion. One such is the swashplate : three actuators balance each other against a central pivot. Although it is used as a rotary to reciprocal movement converter this is something of a compromise, relying on a sliding surface.

I would like to experiment with a TAPAS controller in a swashplate configuration to provide a controlled angular - not rotary - motion of a few degrees tilt exerted in a 360 degree direction - a 2D pointing movement.

This has application in robot legs (controlling direction of actuator force), robot feet (balance), prosthetics (limb angles, foot balance), 3D positioning (when used with a supplementary linear actuator) and, in conjunction with a mirror, light-pointing applications such as the galvanometer actuators in laser displays and SLA 3D printers. A chain of such devices could be assembled into a prehensile actuator.

The force available is limited due to variable magnetic gap but the central pivot avoids the actuators taking the main force - they only have to provide the differential force.


The idea could be investigated using a single TAPAS board, but many practical applications (I am particularly interested in active balance for robotic or prosthetic feet) would require a pair.

  • adrian godwin
  • May 2 2018
  • Admin
    Nora Schille (TAPAS team) commented
    May 03, 2018 12:28

    Hey Adrian,

    and again ;-)  We need some more information about this idea.
    * Can you get a little deeper into the technical site and explain your set-up and the usage of the TAPAS board? Can you provide a sketch or diagram.
    Thank you!
    Nora @ TAPAS team

  • adrian godwin commented
    May 03, 2018 13:08

    It really needs an animated cad drawing but it will take me quite a while to do that - I'm a software and electronics guy, not CAD. I'll do a freehand sketch but I'm not an artist either :)

  • adrian godwin commented
    May 03, 2018 13:13

    I was impressed with the TAPAS idea : I see it as a prototyping platform for high power electronics with an easy path to add high-level control. My initial reaction was 'what can i use that for' and eventually I shoehorned something I'm working on into a proposal that would benefit from the TAPAS control.

    But having got there, and read the other proposals, ideas started to flow rather quickly.  I wrote them down to see if they generated interest and appreciate the details are a bit skimpy. I will add more details as quickly as I can, but would appreciate it if you can suggest priorities.

You can read the official challenge FAQ here!