Pwm setting on esc

[martin]

Any one know if i will notice any difference going from 8khz to 16 khz, As 16 khz is what is advised for small high rpm outrunner motors which is what im running but on 8 khz at the moment. Thanks Martin.

[mickvk]

I was looking for that recently... I found this:

"Here's a formula I ran across thats supposed to figure the proper PWM that so far has been working for me.

Kv x Volts (nominal you are using) x Pole count / 20
For my 500 my motor is 8 pole 1760kv running on 5s so:
1760 x 18.5 = 32560 x 8 = 260480 / 20 = 13,024 so i have rounded down & set my PWM at 12k & it has performed flawlessly.

On the Scorpions I dont use it & just go directly to 8k as the Castle Guys recommended & it works. Should try the formula on them & see if it ='s out to the same or if 8k is just a good all around setting??"

[TotalPackage]

I was looking for that recently... I found this:

"Here's a formula I ran across thats supposed to figure the proper PWM that so far has been working for me.

Kv x Volts (nominal you are using) x Pole count / 20
For my 500 my motor is 8 pole 1760kv running on 5s so:
1760 x 18.5 = 32560 x 8 = 260480 / 20 = 13,024 so i have rounded down & set my PWM at 12k & it has performed flawlessly.

On the Scorpions I dont use it & just go directly to 8k as the Castle Guys recommended & it works. Should try the formula on them & see if it ='s out to the same or if 8k is just a good all around setting??"

where did you find this formula? Is it accurate?

[TotalPackage]

"On the Scorpions I dont use it & just go directly to 8k as the Castle Guys recommended & it works. Should try the formula on them & see if it ='s out to the same or if 8k is just a good all around setting??"

castles recommendation may have been to simply protect there esc as more frequent switches of the fets on and off in the esc the more heat they will produce. I think you may be speaking of two diferent things here. One is what the best pwm setting to get the most out of the motor? 2 is whats the best pwm setting to run cooler and more efficient on my esc? These two things may be inversely proportional to one another.

[mickvk]

where did you find this formula? Is it accurate?

I pasted it in a "note" file... I don't remember where I found it. Sorry.

[martin]

I have instructions for Etti esc + another make which i cant remember the make but they both use the same instructions & say 8 khz is for low rpm & low pole motors. 16 khz is for most high kv & outrunner motors. Thanks.