Re: [Paparazzi-devel] SimonK ESC slow response problem

[Eduardo lavratti]

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
> >>
> >> _______________________________________________
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> >
> >
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