This is Piotr Esden-Tempski's personal blog Zola 2010-09-19T00:00:00+00:00 https://esden.net/tags/closed-loop/atom.xml 2010-09-19T00:00:00+00:00 2010-09-19T00:00:00+00:00 Esden https://esden.net/blog/2010-09-19-open-bldc-v0-3-hardware-based-closed-loop-control/ <p>Hi,</p> <p>Good news everyone!</p> <p>After again a way too long time some new news! I finally implemented hardware based commutation detection and the associated closed loop controller.</p> <p>That was quite a run because of a cascade of timing and timer problems. And a very nasty compiler bug. But now it works and very well on top of that. Woohoo o/ But see for yourself in the video.</p> <iframe class="youtube-player" type="text/html" width="560" height="340" src="http://www.youtube.com/embed/qq3GyXGHJkM" frameborder="0"></iframe> <p>The video also shows the new implementation of the startup routine. It uses now a separate software timer. It was made possible by using SysTick as timer base and implementing the timer in software. This way it is easy to add new timers that don't need to be very time precise, as it is the case in startup, or ignite as I like to call it. :) The old implementation was using timer overflows of the commutation timer that led to nasty speed jumps while starting up and made the startup unreliable.</p> <p>Next step, put Open-BLDC on a plane! :)</p> <p>As always you are welcome to drop by in <a rel="noopener external" target="_blank" href="http://webchat.freenode.net/?channels=#open-bldc">#open-bldc</a> channel on freenode if you have questions or just want to hang around to follow the cutting edge development. :)</p>