Quite some time has passed since our last post on the topic, so it's time to make another one.

Sapog

For those uninitiated, PX4 Sapog is an open source ESC design which you can get familiar with right here: kb.zubax.com/x/cYAh. Over the last months, the following noteworthy things happened to the project:

  • Proper documentation has finally been written: meet the Sapog Reference Manual. Feel free to contribute on Github.
  • The firmware has obtained a much more advanced spin-up algorithm (the new one is now documented in the Reference Manual).
  • After a brief interruption, Zubax Orel 20, which are Sapog-based ESC (pictured), are back in stock at Titan Elite.

I'd like to use this opportunity to remind users about the vices of believing the current capability characteristics stated in marketing materials of certain vendors of low-cost ESC. The issue was somewhat explained in our older post here, and here's a TL;DR: many of the widely used low-cost ESC tend to be unable to achieve the stated performance characteristics. Not ours, no sir.

What's next?

The past few years have been spent working on a brand-new motor control solution which is intended to go much further than a simple ESC for a light UAV. Meet Télega - a completely new PMSM controller which incorporates several grou.... Télega allows you to take virtually any existing low-cost electric drive, replace the existing legacy ESC in it with a Telega-based one, and gain 15% to 30% longer flight time as a result.

The teaser pic on the right shows the first motor controller design that is based on Telega, which we call Myxa. While the project is not really market-ready yet, we're looking for testers who are willing to work with us to weed out the remaining corner cases in exchange for certain benefits. Those who might be interested, please write us (or stop by our new lab in Tallinn, we have cookies).

Speaking of UAVs

The UAVCAN project has received an unexpected development: a new implementation has appeared, this time in Rust. Check out the project here on Github, and read the background discussion here.

Views: 1167

Comment by Jerry Giant on September 18, 2017 at 6:42am

I have received your free sample for almost a year now, and have built a small batch from github Orel files. It works. 

and I have been working with my colleagues to implement a simple motor/rotor efficiency testing tool:

you will need to build a motor base with load cell to measure thrust. and later torque might be implemented as well. we are still testing it. after functions tested code will be cleaned to PR on github.

We are planning to implement ROS interface as well. our goal is to build a rover for land survey. but now strong breaking and reverse functin still now implemented as we wanted.

thanks for your project, made many things possible and convenient 

Comment by Zubax Robotics on September 18, 2017 at 6:45am

Thanks, Jerry!

Comment by Jerry Giant on September 18, 2017 at 7:39am

Hi, I would like to know if new ESC will be open sourced, and I would like to test early samples. sorry for the screen capture. and I made a new one.

Comment by Zubax Robotics on September 18, 2017 at 7:41am

At the moment we don't plan to open source the Telega technology.

Comment by Johnatan on September 18, 2017 at 9:31am

What is difference between Sapog, PX4ESC, CANESC, and Telega?

Comment by Zubax Robotics on September 18, 2017 at 9:47am

Sapog is a basic open source BLDC controller.

PX4ESC is a now-defunct project that no longer exists. In the past, we used it to bootstrap the Telega project.

Telega is a much more advanced design than the above.

CANESC is unknown to me.

Comment by Johnatan on September 18, 2017 at 11:41am

I meant UAVCAN. But thank you for the info. What is the highest current for the new ESC?

Comment by Zubax Robotics on September 18, 2017 at 11:44am

Myxa is rated for 20 A without a heat sink, up to 30 A with a heat sink.

Comment by Guy McCaldin on September 18, 2017 at 4:36pm

Is Sapog still using field-orientated control?

Comment by Zubax Robotics on September 19, 2017 at 12:32am

Sapog does not support field-oriented control, it never did. We first implemented this technology in PX4ESC and then in Telega.

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