Working through the setup for my new E Barnstormer with a BadAss 2320-820kv motor, using a 5S 1800mah pack. One of the motor choices is pulse rate. Inova8tion indicates a rated of 8. On other setups I have used 12 with no issues. Just wondering what others have used?

Also, what motor timing have you used? Inova8tion indicates a range of 5 to 10. I set mine at 7,  hoping to get a little quicker load response. What have you used?

Best,  DennisT

Dennis, I’m sure there are others out there with more expertise than I, but I can share my thoughts on this. I don’t know the effect of changing the PWM setting on load response. I have used it primarily to control motor heat. In my experience if the PWM setting is too high the ESC heat gets higher. If it’s too low the motor heat increases. I can give you some examples.

I use this formula to determine PWM:
(KV x Voltage x Num of Poles) / 20 = PWM

Plane: Mo’Best, motor Cobra 2826-10/930
KV = 930
Poles = 14
Voltage = 18.5 (5s)

(930 x 18.5 x 14) / 20 = 12044 - rounded to PWM = 12khz
Initially the motor PWM was set to 8 and the motor was very hot to the touch. Based on the above calculation I changed it to 12PWM and now the motor runs cooler.

Plane: Trophy Trainer, same motor as above
KV = 930
Poles = 14
Voltage = 11.1 (4s)

(930 x 11.1 x 14)/ 20 = 7226 - round up to PWM = 8khz
I run this at 8 PWM with no heating issues

Plane: Axiom, motor Bad Ass 3515-710
KV = 710
Poles = 14
Voltage = 22.2

(710 x 22.2 x 14) / 20 = 11,033 - round up to PWM = 12khz
I have no heating issues at this setting.

My motor timing in all cases is set to 5.


In your case with the info you provided:
Kv = 820
Poles = 14
Voltage = 18.5

(820 x 18.5 x 14) / 20 = 10,619 - round up to PWM =12khz
Seems like PWM = 12 would be a good setting

Hope this is of some value to you,
Frank

Dennis,
I have not tried “Outrunner Mode”. I think it would be worth trying because based on what I read it would automatically bump the PWM setting if the commutation speed exceeds the current setting.

As for rounding up, I got that formula off the internet some years ago, and it indicated to always round up. I don’t know the reasoning behind it.
 
I was running the Mo’Best configuration at 8Khz, a Bad Ass 12x6R cut down to 11.5 prop, at 8.9K RPM. All active timer functions were turned off. Measured current at that RPM was 23.5amps. It was a hot day in July, and after a 5 1/2 minute flight the motor was too hot to keep my finger on it. The fuselage is a profile so the motor is just about completely exposed. So adequate cooling didn’t seem to be the problem. At that point I bumped the PWM setting to 12Khz and made another 5 1/2 minute flight. The motor was still hot to the touch but not so hot that I couldn’t keep my finger on it. Not very scientific but I could tell the difference.
Frank