General ESC Theory Discussion

[Mister-T]

Sorry it seem that i can't edit my previous post anymore

[lutach]

Mister-T,

Good info. Do you follow the BLDC thread in rcgroups? Some of the guys there have said that the Atmel MCUs do a better job in brushless application. That's why a lot of companies use the ATMEGA8 and ATMEGA16. Most of my controllers that have those will drive all motors that I have very smooth. They might not have all the memory like the Silicon Labs one, but some manufacturer can stuff a lot of info in them.

[Mister-T]

I have seen some interesting stuff with STm microcontroller, they do have there own patented way to detect back EFM, so it can pretty much always start the motor even under load (compressor application they said)

[lutach]

Originally Posted by Mister-T

I have seen some interesting stuff with STm microcontroller, they do have there own patented way to detect back EFM, so it can pretty much always start the motor even under load (compressor application they said)

I think some of my Kontroniks have a STM MCU, it's not really clear. Maybe tht's why they have such an incredible start up. I haven't been able to get any of my Jazz controllers to cog on start up.

[zeropointbug]

I wonder what CC used on the MMM?

[lutach]

Originally Posted by zeropointbug

I wonder what CC used on the MMM?

Rubycon (http://www.newark.com/39K2343/passiv...-35ZLH390M8X20). The picture in the link is only for your reference.

http://www.rc-monster.com/forum/showthread.php?t=11912

[Mister-T]

Originally Posted by lutach

Rubycon (http://www.newark.com/39K2343/passiv...-35ZLH390M8X20). The picture in the link is only for your reference.

http://www.rc-monster.com/forum/showthread.php?t=11912

I think he was asking about the microcontroler, not the capacitor ;)

[Mister-T]

They are not as talkative as STM or Atmel :/

http://www.silabs.com/tgwWebApp/publ...motor_bldc.htm
http://www.silabs.com/tgwWebApp/publ...LDC_MTR_RD.htm

This one give some good info

http://www.silabs.com/public/documen...r/en/AN208.pdf

[johnrobholmes]

Couldn't you just send a small pulse to two or three coils to sense position when stopped? I noticed that the quark ESC would always make an outrunner hum a bit when idle. It also started up outrunner like a champ with no audible noise.

[lutach]

Originally Posted by johnrobholmes

Couldn't you just send a small pulse to two or three coils to sense position when stopped? I noticed that the quark ESC would always make an outrunner hum a bit when idle. It also started up outrunner like a champ with no audible noise.

I think it was sending very small current to sense the BEMF to determine rotor position. It would be cool to see a programmer stuff something like a memory that actually remembers where the rotor was at the time it stopped and when you give it throttle, it would be smooth. Every day that goes by, I regret more and more not getting the electronic engineering class (that also included programming) when I had the chance. I've heard from many places that makes ESC that a HV controller would need to have sensors to accurately know where the rotor is at all times and this is where I hope and wish Aveox makes a comeback. It was one of only a handful of companies that had big 5mm shafted 4 pole sensored motors.