The IMPACTS of PWM 🔼HIGH & Low🔽 Frequency 😍 

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_OTrwCbN-C0.html

www.patreon.com/posts/67971215

I hope noone is clipping a gate with a 7, 8, 9, or 10in!! 😬

@@uavtech what gate? *looks at slivers of stuff*

Temp. :-) Just needed for tuning demonstration

Sounds like a FET issue on the DYI ESC.

haha i came here trying to figure out the something as it's not specifically stated. After watching this video I'm 99% sure you should set it to by rpm.

​@BeautyBeastRC I've been reading a bunch of horror stories using by rpm. By that was with 32.8 , there's not much information on 32.10

24k yo low and high. You can sey high to By RPM too. It mostly stays at 24k anyways.

@uavtech I've read a bunch of people did that and they either smoked a motor or two and or an esc.

then set high and low the same if you prefer. 24 - 24; or 48 - 48 if you want. A lower PWM setting increases motor breaking torque (the ability for the motor to slow down faster), so it makes the motor work header and increases performance. Faster braking will add some more energy to the motor and can make it warmer. If motor is very strong, it take cae too rough with a low setting as ot will be able to brake and slow down for the 24k off/on cycle. High PWM decreases motor responsiveness (less braking torque) so less energy to the motor, but adds heat to the ESC because the Fets are switching twice as fast. Motors are smoother, less responsive, and ESC is hotter. Just know any time you are not at 100% throttle, the ESC is pulsing power to the motor. The PWM signal is just how fast to pulses occur. Faster is smoother, but it chews up deadband time (braking band time).

Yes. It is possible to have at any. Typically going up, lesson electrical noise and makes it easier for the ESC to.detect the back EMF necessary for it to keep the timing and avoid a desync, but nevertheless, maybe for some reason 96k is making it harder for your ESC. Higher PWM takes more ESC compute power and makes the FETs hotter, so maybe one of those is the culprit.

@@uavtech thank you for your answer. another thing too, the cpu load was high (about 70%) before i changed the pid loop from 8 kHz to 4 while leaving the dshot 600. and since then i have a cpu load at 30%

@@arknan9624 the BF CPU load should not have a correlation so I wouldn't worry about that If the CPU load for betaflight maxes out, it might cause the drone to "stutter", but it won't cause it to desync and fall from the sky. That is specifically the ESC losing tract of the motor pole (magnet field) positions. So it doesn't know when the push or pull in the 3-phase power rotation.

Yes.

Also I put 1804 3100kv motors, so 48k is better?

And do I have to make any changes to my tune after I change to 48k?

lower PWM is better for motor breaking torque. So the lower the better, but on small quads will chew up more battery, so 48k is a nice balance. If you have the gains cranked way up for 96k due to lack of motor power, you may need to turn doen, but I doubt it.

​@@uavtech One more thing my esc are on 0.16 bluejay firmware.

lots of electrical noise can typically back feed into the Flight Controller because you cannot put a capacitor on each ESC.

aha i see but not using those 30x30 fcs :) just throwing this out there as there is no large uav build guides for blheli stuff like pixhawk and other autopilots etc..@@uavtech

because your motors have enough torque that they can brake (slow down) when the pulse is off at 24k. Meaning, you need faster pulses for super-high torque motors. It is a good thing actually. Good motors. Keep in mind that the electric charge of the coils is on or off. At 5% throttle, it is off 95% of the Duty Cycle. One small pulse on and mostly off. At 100% throttle, it is ON 100% (0% off). The PWM is how many pulses you have per second. 24,000 or 48,000. Since the motors slow down between each small pulse at 24k, they start to vibrate and cause a horrible grinding sound. At 48, it is too fast for them to react. Like the human eye can not see a 60hz screen flicker of a monitor, but a camera can, unless you increase the screen refresh rate. If you can see the flicker with your eyes, you have good eyes.

@uavtech wow! thanks for the detailed reply! Im confused why I can't run 24khz on a high end build as others are using it without problems like me. I'm fine with the stock 48, it flies great, just curious. Is there something I have to change along with the pwm to get it to run smoothly?

higher PWM is smoother, but it reduces motor brake torque. For very powerful motors, that is needed.

up to 80% is fine in latest releases. How % is defined was changed.

@@uavtech thank for the advice and the videos mate 🙏