I have a tin can bipolar stepper motor. It has two stators A & B.
When I disconnect the motor and measure the differential voltage across A, I get this:
It's actually strange as we are using a h-bridge configuration, so I would have expected a negative voltage as we are pulsing High, Low, nevertheless I am not too worried about this.
The issue that is causing major confusion to me is the next trace:
The sequence is correct but rather than go to zero, the voltage is only dropping to approximately half that of the high voltage.
The motor is actually stepping correctly and in the right direction.
Is the low voltage being high linked to the direction of movement? I have been looking for an oscilloscope trace of a h-bridge online in order to compare what I have seen but found nothing . Does anyone know if this is expected behaviour?