Original question:
With Your help I got the Motor running.
Please can You give me some Information about the influence of Control Advance Time.
What will happen if the value is too low or too high?
With the rough calculations for "Kt" described in the Tuning Guide I got a value of 50mV/Hz.
This value proofed to be good during testing.
Thank You
Edelbert
Hey Edelbert,
The Commutation Control Advance Angle section in the DRV10983 Datasheet discusses the definition and influences of the control advance time.
As shown in the figure above, we can summarize control advance time as the a parameter that determines when the voltage is applied to the phases. Essentially, we want the Phase current to be in phase (or line up) with the Phase BEMF voltage. If these waveforms are in phase, we know that the applied magnetic field from the coils matches with the physical rotation of the motor. For example, if the current 0A when the BEMF is 0V, we know that the rotor is the aligned to the coil (motor pole).
As a result, if the time is too high or too low, by a small amount, the motor won't be as efficient (more phase voltage and current required for same speed). Following the procedure in the tuning guide will help tune the parameter. If the time is too large, the motor will fail to spin at all because the magnetic fields will conflict with the position of the motor.
Glad to hear the calculated Kt has helped you.
Best,
-Cole
