I never knew the DJI Go App had a built ind RPM sensor,I keep learning more and more what the Go App has.
Yep, and when you hit around 8000 RPM in thin air (12,000'MSL) and high winds, you'll get an RPM MAX warning.Was flying yesterday Near Fire Island New York after looking on the Go App bottom left i was trying to find the orientation of my P4 clicked on the GPS and saw RPM of the 4 Motors each was slightly different in the 5350 area never seen this before.
Being a brush-less motor, it is a simplified AC motor which is commutated by pulsing the winding pairs - therefore the speed of the motor can be very accurately and directly deduced by the number of commutations per second fed to the motor divided by the number of phases (assuming no slippage - unlikely to slip in this motor), not as per the calculation shown in your' link which talks of a normal or brush commutated DC motor.I believe it's a calculated value.
https://www.google.com/amp/s/amp.re...alculate_the_rpm_of_a_dc_motor/?client=safari
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Why do you say it's a simplified AC motor? It may have fixed magnets on the rotor but it is a typical AC induction motor.Being a brush-less motor, it is a simplified AC motor which is commutated by pulsing the winding pairs - therefore the speed of the motor can be very accurately and directly deduced by the number of commutations per second fed to the motor divided by the number of phases (assuming no slippage - unlikely to slip in this motor), not as per the calculation shown in your' link which talks of a normal or brush commutated DC motor.
Phantom 4 motor: Inside a Drone – Brushless Motors
The proper tech name for it is a BLDC motor or BrushlLess DC motor, but I think we are on the same wavelength just in different waysWhy do you say it's a simplified AC motor? It may have fixed magnets on the rotor but it is a typical AC induction motor.
They arent BLDC motors on the current and recent DJI gear, these motors are driven by a sinusoidal waveform (sine wave). These are true synchronous AC induction motors where the speed is locked to and directly determined by line frequency rather than pulsed DC.The proper tech name for it is a BLDC motor or BrushlLess DC motor, but I think we are on the same wavelength just in different ways
For anyone interested, here is a wiki article that explains probably better than I did...
Brushless DC electric motor - Wikipedia
Was flying yesterday Near Fire Island New York after looking on the Go App bottom left i was trying to find the orientation of my P4 clicked on the GPS and saw RPM of the 4 Motors each was slightly different in the 5350 area never seen this before.
Wouldn't the change of the RPMs be because of the ESCs being told by the flight board what to do based on the wind?Was flying yesterday Near Fire Island New York after looking on the Go App bottom left i was trying to find the orientation of my P4 clicked on the GPS and saw RPM of the 4 Motors each was slightly different in the 5350 area never seen this before.
Yes but have not been able to find it again crazy things happening next time i will try and figure how i found it.