AM8851-0E21-1002 Beckhoff
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The Beckhoff AM8851-0E21-1002 is part of the AM Synchronous Servo Motors series. It features a 104 mm flange size with a smooth shaft and uses a 24 V holding brake. The motor offers a holding torque range of 9 Nm to 20 Nm depending on its length and supports OCT multi-turn feedback.
Internal Product Review
The AM8851-0E21-1002 is a Beckhoff synchronous servomotor featuring OCT multi-turn feedback and a smooth shaft. A 24 V holding brake with 9 Nm to 20 Nm holding torque supports secure axis retention in precision motion applications. A well-executed servo motor choice for dependable feedback and confident brake performance.
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Product Description:
The AM8851-0E21-1002 is a synchronous servo motor manufactured by Beckhoff as part of the AM Synchronous Servo Motors series. In industrial automation, this motor converts drive amplifier current into controlled mechanical rotation, so axes in packaging machines, gantry stages, or pick-and-place heads can be positioned with repeatable accuracy. The unit fits directly into EtherCAT-based motion systems that depend on closed-loop control for velocity, torque, and position.
The electromagnetic holding brake is energized at 24 VDC, allowing the shaft to be locked when power is removed. A square, metric B14 flange with a diameter of 104 mm establishes the mounting interface and centers the rotor with minimal runout. Rotor angle is reported through an OCT multi-turn feedback encoder, which stores absolute position over multiple revolutions to simplify homing after maintenance or an emergency stop. The motor includes a 24 V holding brake that helps prevent load drift on vertical axes. Continuous static retention depends on motor length, and the resulting clamp force ranges from 9 Nm to 20 Nm. The output end uses a smooth shaft, which eliminates keyway stress concentrations and makes the motor compatible with backlash-free clamp couplings often found in high-precision servo trains.
The motor has length code 1, which gives the shortest stack length available in the 88 mm frame and helps reduce axial space. This unit is identified as a special version, indicating deviations from the standard configuration such as tempered insulation, alternative varnish, or customized connectors. Magnetic and thermal behavior follows winding code E, so compatible drive settings must match the current, voltage, and resistance values for that coil set.
