Product Description:

The AM257L-0020 synchronous servo motor is manufactured by Beckhoff and belongs to the AM Synchronous Servo Motors series. It is designed for precision positioning and velocity control in industrial automation cells, where the controller demands rapid yet accurate rotary motion. This L-design variant incorporates an increased mass moment of inertia so it can better match loads with higher rotational energy. That characteristic can improve motion smoothness on axes that carry heavier rotating components or experience frequent speed changes. A smooth shaft allows direct coupling to gearboxes or mechanical transmissions without keyed interfaces.

During continuous operation, the rotor runs at 3000 rpm and delivers a steady torque of 8 Nm, generating up to 2.51 kW of mechanical power to the load. The electromagnetic design provides a torque constant of 1.55 Nm/A, indicating how much torque appears per ampere of stator current. For short acceleration bursts, the connected amplifier may supply as much as 27.5 A of peak phase current. The motor has a phase-to-phase resistance of 1.61 Ω, and OCT multi-turn feedback reports absolute shaft position to the motion controller. The six-pole rotor, 6.5 kg·cm² inertia, and 194 mm flange suit medium-size gantries, packaging stations, and material-handling axes. The motor is supplied without a holding brake, so external mechanical restraint must be used when power is removed.

The motor has a winding time constant of 70 min, allowing it to absorb overloads for extended periods before reaching its temperature limit. At rated speed, the bearings accommodate axial forces up to 180 N and radial forces up to 580 N, which is sufficient for belt drives or pinion outputs mounted directly on the shaft. A phase-to-phase inductance of 10 mH filters current ripple, which helps improve servo stiffness and reduce audible noise. These characteristics support applications with repeated starts, stops, and changing mechanical loads during normal operation.