I am trying to detect the zero crossing point of the BEMF voltage in order to control the motor sensorless.
The following picture shows the ideal shape of BEMF and in many application notes or internet posts looks like this.
But what I am seeing on the oscilloscope looks like this (the capture is not mine, it is from this post BLDC BEMF not right where @Erik Friesen says that are "waveforms scope shots from a working esc". The question is why in the second picture the second bemf does not exist ?