OK, I just flipped the table. I was using the up/down arrow keys from the start for bench testing as this feels quit natural to do. I just now tried using the "Set Current" control input in the gui and the motor spinns absoloutly flawlessly. WTF? You know, the text box where you can enter a target current and just hit the button to set it. This starts looking like some kind of communication problem with the µC. I need to dig up the coms code and check how set current and arrow keys differ in control input. I had a look over it some time ago and noticed strage things going on there.
lizardmech wrote:Can you take some screen shots of current graphs while it's running slowly?
The shot already shows quit low eRPM. When a sync loss strikes currents spike and the graph gets realy difficult to read. I attached some shots to show some different situations. Quit remarkable: Even though the current waveforms are garbage the motor still runs fine. I noticed a quite severe offset in phase currents in the high speed run. Still it does run fine. I can not say much about the efficiency at this point. I will start testing drive performance tomorrow. Hopefully.