AX2020 by Beckhoff

The AX2020 is a two-channel digital servo drive produced by Beckhoff within the AX Digital Servo Drives series. As a power stage, it converts the DC link supplied by a common power supply into precisely timed output currents for synchronous or induction motors used in machine tools, packaging equipment, and material-handling axes. The unit interfaces with the TwinCAT automation platform over a fieldbus to close position and torque loops, while its integrated current sensors provide the rapid cycle-by-cycle regulation required for modern industrial automation tasks.

The drive supplies a continuous phase current of 20 A RMS, establishing the available current for motor selection. For acceleration or brief overloads, the phase current increases to 40 A RMS, supporting dynamic moves during short periods of high demand. Cabinet feeders must accommodate a rated installed load of 14 kVA, which is the apparent power drawn at full output. Current is modulated by transistors switching at 8 kHz; this frequency affects control granularity and audible noise. An output current form factor of 1.01 indicates an almost sinusoidal waveform, helping to keep winding losses low. The permitted motor inductance ranges from 2 mH to 12 mH, and the residual voltage drop is 5 V. The analog ground has an input resistance of 20 k? and permits a maximum common-mode voltage of 10 V.

At rated current, the power stage produces 200 W of heat, while it releases only 15 W in standby mode. The steel housing measures 120 mm in width, 265 mm in depth, and 275 mm in height without connectors, allowing side-by-side mounting on a DIN rail within 600 mm cabinets. A mass of 7.5 kg requires adequate panel support but permits installation without lifting equipment. The housing dimensions and required clearances support sufficient airflow around the drive during operation.