![]() However the downside of higher PWM frequency is the decrease in braking power (just deceleration of the motor, acceleration unaffected) hence results in less responsiveness in flight. When you increase the PWM frequency, the motors tend to run smoother and generate less noise, with an increase in efficiency (flight time) and a slight boost in maximum thrust and power. Note that this “PWM Frequency” setting is entirely unrelated to ESC protocol, FC looptime or the PWM frequency setting in Betaflight. This basically means how often the ESC drives the motor. The “PWM Frequency” setting in BLHeli_32 changes how often the microcontroller (MCU) in the ESC sends updates to the MOSFET. Motors are driven by a PWM signal from the ESC, which is basically a voltage that turns on and off rapidly. Now let’s go into a bit more detail about what each setting really do. Note that these settings are only available using BLHeli_32 ESC’s. Looking for new ESC’s? Here are the best ESC I’ve tested and recommend. If you are using the latest firmware (32.8 or newer), you can try Variable PWM frequency by setting PWM Frequency Low to minimum (as low as it can go), while setting PWM Frequency High to maximum (as high as it can go). Motor Timing: 22 or Auto for freestyle 25 (or higher) for racing.PWM Frequency: 48KHz Fixed for freestyle 24KHz (or higher) for racing.If you have ESC desync, try to set Demag to High, high Motor Timing, lower Rampup Power.ESC Protocol: DShot600 for 8K/8K, or DShot300 for 4K/4K (Looptime in Betaflight).Motor Timing: 16deg for responsiveness, Auto for efficiency.PWM Frequency: 16-128KHz Variable by RPM for freestyle, 24KHz – 48KHz for Racing, 128KHz (or highest possible) for 2″ or smaller drones.The test was based on 2004 motors, but the result should also apply to similar size motors. 2022 RecommendationsĬhris Rosser did some testing and tried to find the optimal BLHeli settings for the best possible responsiveness or efficiency based on more objective data rather than “feel of the pilots”. You should really “tune” it and find out what works the best for your own build. ![]() However it might not work on every build because of the different sizes, components and personal preference. ![]() If you don’t want to read the long article, here is the summary.
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