Hi,
Is it normal for back emf signal to fluctuate with a constant speed?
For example, a fixed pwm value is used to drive the motor but the back emf signal of the motor fluctuate from 600mV to 800mV.
The same condition occurs after increasing or decreasing the pwm value with increased or decreased back emf respectively.
If it is normal, is there anyway to filter the signal to get a smoother graph?
Thanks in advance.