|
From: | Eduardo lavratti |
Subject: | Re: [Paparazzi-devel] SimonK ESC slow response problem |
Date: | Wed, 16 Apr 2014 16:46:14 -0300 |
Ok ...
i love the bootloading over ppm wire. > To: address@hidden > Date: Wed, 16 Apr 2014 21:36:18 +0200 > From: address@hidden > Subject: Re: [Paparazzi-devel] SimonK ESC slow response problem > > Eduardo, after the firmware modification I'm pretty satisfied with tgy > firmware. Especially I like the bootloading of code over ppm wire, > otherwise it would take very much effort to flash an other version. > However if the firmware works properly there is no need to reflash it > (which I would actually prefer). > What I want to say is that the "simonk" escs don't always work properly > out of the box. > > Best regards, > Sergey > > > Hi Sergey, > > have you tested wii-esc firmware ? > > > > Some time ago i changed all my esc from simonk to wii-esc > > Actually i only use hk blueseries 40amp esc with wii-esc firmware > > (Complimentary PWM) > > this is the best combination i ever tested. > > > > On my little quad i use hk blueseries 20amp. > > > > > > > > > > On 04/15/2014 04:52 PM, Sergey Krukowski wrote: > >> Hi guys! > >> > >> Last time I had a chance to work a bit with different ESCs flashed with > >> SimonK firmware and since it wasn't really plug and play or fast and > >> furious as most comments in web say - wanted to share some experience. > >> First of all I tried 3 different rotorcrafts with 3 different motor > >> sizes with 3 different ESCs: > >> > >> ST4708 360KV with 15x5.5 propeller and Turnigy Multistar 45 Amp 6S LiPo > >> MK3638 700Kv with 13x4.7 propeller and ZTW Spider Series 30A OPTO 4S > >> LiPo > >> CF2822 1200Kv with 10x4.7 propeller and Afro ESC 12Amp 3S LiPo > >> > >> As far as the first rotorcraft was pretty large, it was pretty stable > >> and I didn't really noticed any weird behavior. > >> However both other showed very weird frame oscillations mostly in > >> horizontal frame positions. And there was no PID combination to find, > >> that would remove these oscillations (was using ahrs_int_cmpl_quat with > >> euler_int attitude stabilization). > >> The oscillations wasn't really large, didn't really impact horizontal > >> position stability but the overall external flight quality was > >> unacceptable. > >> > >> The actual problem eventually was in SimonK firmware. Most of recently > >> released versions (well, most likely ALL available to buy ESCs with > >> SimonK firmware) have a poorly solved max output power limitation > >> depending on commutation period (most probably because of atmega's > >> calculation power lack). That is why on some motor/propeller/pwm > >> command combinations it doesn't give enough power to motor, causing > >> undershoot and therefore the weird oscillations I described. > >> > >> The actual solution was to increase TIMING_RANGE1 and TIMING_RANGE2 > >> values, so the firmware can give more power on lower rpms. But it > >> should be care taken about that modification, because it can cause > >> other problems, for example motor stall. > >> > >> P.S. > >> Right now there is an other way of the max power limitation implemented > >> under the tgy github, looks like it should work more stable on > >> different motors/props/rpms than before. > >> > >> Best Regards, > >> Sergey > >> > >> _______________________________________________ > >> Paparazzi-devel mailing list > >> address@hidden > >> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel > > > > > > _______________________________________________ > > Paparazzi-devel mailing list > > address@hidden > > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel > > > -- > Erstellt mit Operas revolutionärem E-Mail-Modul: http://www.opera.com/mail/ > > _______________________________________________ > Paparazzi-devel mailing list > address@hidden > https://lists.nongnu.org/mailman/listinfo/paparazzi-devel |
[Prev in Thread] | Current Thread | [Next in Thread] |