Product Description:

The AM257S-0021 synchronous servo motor is produced by Beckhoff as part of its AM Synchronous Servo Motors series. It is intended for closed-loop motion axes where direct coupling to belts, gearboxes, or load shafts allows precise velocity and position control in automated equipment. Its synchronous servo design lets the drive regulate speed and position with quick response during changing load conditions. This supports accurate starts, stops, and repeatable positioning in machinery that depends on coordinated rotary motion.

The motor’s holding mechanism is energized from a dedicated supply of 24 VDC, separating brake power from the main drive bus. Rotor position is returned to the controller through an OCT multi-turn encoder, which provides absolute feedback over multiple revolutions so homing cycles are unnecessary after power loss. Mechanical attachment follows an IEC flange pattern that measures 194 mm, giving a broad mounting surface for high-torque joints. During a commanded standstill, the brake can resist up to 70 Nm, allowing vertical or overhung loads to remain fixed without drive current. The motor uses a smooth shaft output, which avoids keyway stress concentrations and supports shrink-fit or clamp-style couplings.

The integrated brake is a 24 V holding brake, permitting rapid engagement whenever the enable signal is removed. Because the rotor belongs to an increased mass moment of inertia variant, the motor works well with drive controllers that can supply higher acceleration energy and maintain stable motion during load changes. The encoder, brake, and temperature sensors connect through standardized hybrid cabling, which keeps wiring compact and groups the required motor connections in one interface. That arrangement reduces the need for separate feedback wiring and helps keep cable routing orderly in compact machine frames.