Bardzo przyjemnie wytłumaczyłeś to zagadnienie. Nawet mnie jako elektromechanikowi maszyn i urządzeń elektrycznych przyjemnie się to ogląda. Brawo Pawle. Pozdrawiam.
Paweł thanks for this movie - good job. For those interested in the subject, please refer to: Microchip AN 885 -> "Brushless DC (BLDC) Motor Fundamentals", Microchip AN857 -> "Brushless DC Motor Control Made Easy", Microchip AN1160 -> "Sensorless BLDC Control with Back-EMF Filtering Using a Majority Function", Microchip AN1078 -> "“Sensorless Field Oriented Control of a a PMSM". In the native language: Paweł, czy przypadkiem modelarski silniczek BLDC nie jest w konfiguracji gwiazdy a nie trójkąta ?
I love how clearly you explained everything! I just have one question: When breaking does the ESC simply short one (or more) phases or does it activly create a counteracting magnetic field by reversing the "usual" polarity? Which method yields better results?
Nice video. Also worth noting the DJI esc tech is very good, particularly on the E5000 and E7000 propulsion systems for the bigger drones. But it's not open source so it's not so interesting :)
Thank you for the video! I was wondering: how do bidirectional escs switch direction? It seems possible to reverse all current directions, but how does that work when the motor is moving?
it has nothing to do withj current reversal. Those are 3 phase motors. All ESC has to do is to reverse the rotation of magnetic flux. So instead of powering phases ABC it switches to ACB
@@FPVUniversity Ah I see. I’ll go back and study the theory a little more. If it’s just a phase reversal, would it be possible to turn a single-directional into a bidirectional esc with external circuitry? For example, having the two of the phases from the esc go to an h-bridge-like circuit before the motor so that you can flip them with a external control signal in order to switch direction Thank you for taking the time to respond!
Hi pawel, great content! I Have a question to you if you have time to answer; How is active breaking working, because the FC only tell the motors what "power" to have and not what rpm. How can then the esc know for how to hard to break and for how long. Thanks, best regards Martin
According to your explanation, the ESC sense back EMF voltage through the energized phase. How is that possible when the phase is under full potential made by the FET bridge? Wouldn't it makes sense for the ESC to measure back EMF voltage through phase that isn't energized?
Finally a video that really explain how to ESC works, thanks!
I liked this format!!
Thank you Pawel. Very clear. Cheers from Rome.
Pretty interesting! Thank you, Pawel! 😃
Stay safe there with your family! 🖖😊
Maybe a theme for one of next videos. "Why are some brushless motors notchy and some arent"
Bardzo przyjemnie wytłumaczyłeś to zagadnienie. Nawet mnie jako elektromechanikowi maszyn i urządzeń elektrycznych przyjemnie się to ogląda. Brawo Pawle. Pozdrawiam.
A dziekuję serdecznie!
Paweł thanks for this movie - good job.
For those interested in the subject, please refer to:
Microchip AN 885 -> "Brushless DC (BLDC) Motor Fundamentals",
Microchip AN857 -> "Brushless DC Motor Control Made Easy",
Microchip AN1160 -> "Sensorless BLDC Control with
Back-EMF Filtering Using a Majority Function",
Microchip AN1078 -> "“Sensorless Field Oriented Control of a
a PMSM".
In the native language:
Paweł, czy przypadkiem modelarski silniczek BLDC nie jest w konfiguracji gwiazdy a nie trójkąta ?
the one use are Delta terminated. You can wind one yourself and terminate phases into Wye and it will work as well.
Good explanation of the brushless motor ESC👌 Would it be fair to describe these small ESC units as a type of miniature Variable Frequency Drive(VFD)?
I love how clearly you explained everything!
I just have one question:
When breaking does the ESC simply short one (or more) phases or does it activly create a counteracting magnetic field by reversing the "usual" polarity?
Which method yields better results?
most escs short the phases to slow the motor down
can you do a video where you hook up a signal generator to send the signal and make the esc work
Nice video. Also worth noting the DJI esc tech is very good, particularly on the E5000 and E7000 propulsion systems for the bigger drones. But it's not open source so it's not so interesting :)
Thank you for the video! I was wondering: how do bidirectional escs switch direction?
It seems possible to reverse all current directions, but how does that work when the motor is moving?
it has nothing to do withj current reversal. Those are 3 phase motors. All ESC has to do is to reverse the rotation of magnetic flux. So instead of powering phases ABC it switches to ACB
@@FPVUniversity Ah I see. I’ll go back and study the theory a little more.
If it’s just a phase reversal, would it be possible to turn a single-directional into a bidirectional esc with external circuitry? For example, having the two of the phases from the esc go to an h-bridge-like circuit before the motor so that you can flip them with a external control signal in order to switch direction
Thank you for taking the time to respond!
Hi pawel, great content! I Have a question to you if you have time to answer; How is active breaking working, because the FC only tell the motors what "power" to have and not what rpm. How can then the esc know for how to hard to break and for how long. Thanks, best regards Martin
ESC knows that motor is free-wheeling. It does not have to know the expected RPM to "know" that it's faster than expected
@@FPVUniversity Ok so I guess this is detected by some ratio between input power and back EMF? To decide if faster than expected?
Thanks
Thanks man!
According to your explanation, the ESC sense back EMF voltage through the energized phase. How is that possible when the phase is under full potential made by the FET bridge? Wouldn't it makes sense for the ESC to measure back EMF voltage through phase that isn't energized?
Not exactly. Phases are separated by 120deg and it is possible to compute zero crossing on phase A by observing phases B and C
Yup, you measure BEMF on the floating phase :-)
Why does the motor effisency drop while increasing throttle?
Probably because of impedance. (Resistance related to frequency)