Skip to main content
FW version: Stable

D-axis excitation

This subsystem enables d-axis current control for other-than flux weakening purposes. Specifically, MTPA (Maximum Torque Per Ampere) is implemented.

info
  • The following variables are located in the /driver/dac folder.
  • This page is related to the VECTOR algorithm only.

The MTPA, using the motor parameters, is trying to find the best value of the D-axis current to maximize the shaft torque for the given total stator current. This algorithm is suited usually for the IPM motors.

Parameters​

dxc [.iref]​

This parameter limits the maximum d-axis current for the other-than flux weakening purposes <0:disable>

Previously, this parameter was named mtpa.

mtk [-]​

The MTPA feedback gain. The higher the value, the faster is the MTPA algorithm convergence. The lower the value, the smoother the response and lower the risks of oscillations. <0:direct map>

Special value: 0 - disables the MTPA algorithm and forces dxc * iref current as the D-axis current reference.

States (only esc5)​

idref_dx [A]​

The calculated d-axis excitation current reference.