Product Description:

The AM8551-1E21-0000 is a synchronous servo motor produced by Beckhoff within the AM Synchronous Servo Motors series. It is intended for positioning and speed-controlled axes in industrial automation where compact dimensions and repeatable dynamics are required. As a standard version, it fits applications that need rigid control loops without special options. Its operating role is to convert drive commands into controlled rotary motion for machinery that depends on accurate starts, stops, and speed changes.

This model uses a brake voltage of 24 VDC, so the holding brake can be powered from common control supplies. Position feedback is provided by an OCT multi-turn encoder, which supplies absolute rotor position information for multi-revolution tracking and helps the drive retain position data after power cycling. A flange size of 104 mm establishes the mounting interface for machine plates and gearbox connections. The integrated 24 V holding brake secures the axis at standstill, and the rotatable angular connector or terminal box connection helps with cable routing where space is limited. Beckhoff lists the motor as having an increased mass moment of inertia, which can help stabilize speed when the driven load has a significant inertia mismatch.

Depending on the overall length code, the unit supplies between 9 Nm to 20 Nm of holding torque, and this model uses length code 1. Power is transmitted through a DIN 6885 compliant shaft with groove and feather key, allowing keyed couplings to be installed without extra shaft machining. That shaft arrangement helps transfer torque securely in applications with repeated acceleration and deceleration. The winding code E identifies the electrical characteristics used by compatible drives for correct current control. A rotatable connector also allows the motor to be oriented in different directions to suit the available machine layout.