Gate-source voltage waveform in brushless motor drive

Thread Starter

Ashkan4818

Joined Jul 23, 2022
1
What should be the gate-source voltage waveform of the high side MOSFETs in a brushless motor drive with a trapezoidal control method?
1000005919.jpg
Are these parts marked in red in the picture above normal?

There is no such thing at the bottom side MOSFETs
1000005903.jpg

Schematic:
0kbCG.jpg


When I reduce the value of R47 and R57, this effect is reduced, but the drive is no longer able to rotate the motor

Can this event be due to BEMF or is it Miller effect?

How can I remove the part shown in the first picture without affecting the performance of the drive?
 
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