Hi Rick,
When the motor is stationary with the standard PWM scheme, both phases are low, since the duty cycle is 0.
However, for the motor to be stationary using the complementary scheme requires that the duty cycle is 50%.
Here is a screenshot of the standard PWM when the motor is stationary - as you can see both phases are low...
Here is the standard method with the motor moving: phase 1 has ~30% duty cycle and phase 2 is off:
And here is the motor moving at the same speed but with the complementary method, in this case I think the duty cycle is around 50 + (30/2) = ~65
Hope this helps.
Regards,
Rob
