Tool/software:
Hi Community,
I am working on BLDC Sensorless motor and using LAUNCHXL-F280049C with custom driver board with DRV8320H.
I am getting 6 PWM output as per attached snapshot. I have used ePWM block to generate PWM waveform in MATLAB.
Trying to understand what will be output as per 6xPWM truth table? What will be MOSFET switching sequence?
Is motor will be able to run as per these waveform and truth table output?
Thanks.
Hello Bhagyesh,
Do you have a motor you can test this with? Here is the truth table from the datasheet you can use to compare with your waveforms:
Regards,
Yara
Hi Yara,
I have BLDC Sensorless motor but not yet connected. These waveform are only output of PWM GPIO of Launchpad.
I am already referring this truth table.
By these waveform, I can understand, all high 3 mosfet can be turned on at same time.
How should be Ideal waveform? How to change in ePWM block setting in order to get switching pattern as per attached image.
Hello Bhagyesh,
I believe you would have to shift Phase B by 120 degrees and Phase C by 240.
Heres a rough example using your waveforms
Regards,
Yara
