PWM and DC Busbar Voltage

[Maverickmax]

Hi

I have set a microcontroller up to produce 3 phase for AC motor and I have noticed that the recurring noise patterns appears on my oscilloscope when I put my probed on the zero voltage busbar. Why is that? How to remove this problem?

MM

 

[amiralib]

1- what kind of microcorntroller do you use?
PIC is better in this category

2- you can seperate the analog GND and the digital GND
its very important

regards

 

[janson_lu]

to amiralib:

why is it important to seperate the analog GND and the digital GND ???

 

[akmirror]

hey ..Can anybody plz tell me...how can i control ...motor direction using the H-bridge...drive..sth,,LD319..sth like that..i m stuck???/