Current controller

The current controller represents the inner controller of the cascading control loop structure. Based on field-oriented control, an advanced PI controller provides the current components required for the requested operation mode S-0-0032. The q-current is proportional to the torque (for linear motors it is proportional to the force). The settings for the current controller parameters K_p and T_N are based on the motor winding data and the optimum bandwidth (compromise between dynamics and noise generation).

For Beckhoff motors the settings for the optimum bandwidth are taken from the electronic type plate (or offline from the motor data files *.xeds). For the most applications these settings can be left unchanged. The motor data generator can be used to create motor data files for third-party motors.

Corresponding pre-controls are applied to deal with systematic interference:

• Load and mains voltage-dependent fluctuations of the DC link voltage
• Induced motor voltage and
• Voltage over the winding inductance.