Product Description:

The AX2090-MD50-0012 is a motor choke engineered by Beckhoff for the AX Digital Servo Drives series. Installed between a servo inverter and its three-phase motor, the choke smooths current transients and limits cable-borne electromagnetic interference, allowing stable drive performance over extended wiring runs in industrial automation cells. By matching the electrical impedance of the drive system, the device protects both the power electronics and the motor insulation when the application demands high-frequency switching typical of modern synchronous servos.

The choke carries a continuous phase current of 12 A (S1 duty), which is the maximum RMS load it can handle continuously without exceeding its thermal limits. Its winding inductance of 0.2 mH introduces the reactance required to attenuate high-frequency components in the pulse-width-modulated output of the AX drive. Designed for power buses up to 480 V AC, it can be wired directly to the standard supply voltage used by AX servo inverters. The copper path resistance is only 25 mΩ, so the additional voltage drop and heat generation remain low even at the specified current. Thermal qualification is performed for ambient operation up to 50 °C, ensuring the choke maintains its impedance without premature insulation aging in elevated cabinet temperatures.

When a machine layout requires motor leads up to 100 m, the choke helps keep dv/dt within safe margins so the drive can meet EMC rules without additional output filters. Dielectric tests verify insulation integrity: the coil conductors withstand 1770 V DC, while coil-to-housing isolation endures 2700 V DC. These clearances work in conjunction with a grounded metallic mounting plate that diverts fault currents directly to the cabinet frame. At just 2.9 kg, the unit adds minimal mass to a crowded panel, allowing easy installation alongside the AX drive modules.