It is custom board i am finding noise on the hall signals when the motor is running. When i run it at 48V using power supply it runs but observing noise on the hall waveforms
I am separating the power ground and digital ground using the Ferrite bead BLM21BB201SN1D but i do not observe any improvement, i am using a hall filter of around 2KHz cut off frequency, resistance is 10k and Capacitance is 8.2nF.
When i connect to 60V battery and try to run it gives hall fault due to noise. Is Schmitt trigger is the only option? Please help.
What hall sensor are you using, and have you tried swapping in another to rule out a defective part ? I just recently went through this whole signal integrity exercise only to discover the sensor was no good, fixed by simple replacement
Thank you for the reply and sorry for the late reply,i don’t have details of hall sensor it is from another source. It is not defective part the same behavior is observed in other motors as well. The wave form i have shown is at the hall connector, but at the micro input it is clean but the problem is some times it is false triggering at the micro input and i get a fault. I tried all possible methods to reduce it. I connected 0.1uF between the 5V and Gnd at the Hall connector input but i don’t observe any changes in the waveform. I expected some change in the waveform but nothing changed why? What are the other things i can try to reduce it. The noise starts as soon as the PWM switching starts to run the motor. It is custom hardware.
The above waveform is from my controller at hall connector,
At the hall connector input of the standard controller, i see lot of difference, i am not able to proceed further. Please provide some suggestions how do i reduce it.
