AM257M-0021 Beckhoff
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The AM257M-0021 is a synchronous servo motor by Beckhoff, part of the AM Synchronous Servo Motors series. This motor features a 194 mm flange size and a smooth shaft design. It has an OCT multi-turn feedback type and is equipped with a 24 V holding brake that provides 70 Nm of holding torque.
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Product Description:
The AM257M-0021 is a synchronous servo motor for automated axes in packaging equipment, gantry systems, and general machinery. It converts electrical power into regulated rotary motion so the drive can maintain controlled torque and speed during positioning and speed-regulated tasks. This supports accurate indexing, repeatable cycle timing, and stable motion across applications that require frequent starts, stops, and direction changes. Its mechanical interface follows IEC flange dimensions, which helps simplify installation on standard mounting brackets and supports consistent alignment with driven components.
The motor uses a 194 mm flange, which provides a broad mounting surface for rigid attachment to machine frames. The brake circuit operates on 24 VDC, allowing it to be supplied from a common control-voltage source. Position feedback is provided by an OCT multi-turn encoder, so the controller receives absolute shaft position over multiple revolutions without a homing move after power loss. The motor has a rated stall torque of 70 Nm for holding force at standstill. A smooth shaft supports precise torque transfer through clamping hubs and avoids keyway-related stress concentrations. That combination supports closed-loop operation where standstill stability and position retention are important, especially on axes that pause frequently between moves.
To hold the axis when power is removed, the motor includes a 24 V holding brake that engages automatically and releases through the same control voltage. The rotor uses an increased mass moment of inertia, which helps reduce speed fluctuation during load changes and supports smoother motion in demanding servo loops. Within the AM Synchronous Servo Motors family, this version is intended for applications that benefit from greater rotational stability without changing the overall mounting format. It is built for use with Beckhoff motion systems, and the brake and feedback arrangement help the axis return to controlled operation quickly after an interruption because shaft position remains available to the control system.
