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 1000005919.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281400-c568fb89443687e3116c8508ce8ecc14.jpg)
Are these parts marked in red in the picture above normal?
There is no such thing at the bottom side MOSFETs
![1000005903.jpg 1000005903.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281399-8af58b890ec1ab8e61e324989b6f8e4a.jpg)
Schematic:
![0kbCG.jpg 0kbCG.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281401-ca99ee189df257ff8678ab66627d654e.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?
![1000005919.jpg 1000005919.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281400-c568fb89443687e3116c8508ce8ecc14.jpg)
Are these parts marked in red in the picture above normal?
There is no such thing at the bottom side MOSFETs
![1000005903.jpg 1000005903.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281399-8af58b890ec1ab8e61e324989b6f8e4a.jpg)
Schematic:
![0kbCG.jpg 0kbCG.jpg](https://forum.allaboutcircuits.com/data/attachments/281/281401-ca99ee189df257ff8678ab66627d654e.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?