AA2FM56/61W-VSD520

The AA2FM56/61W-VSD520 motor belongs to the A2FM Fixed Motors series manufactured by Bosch Rexroth for closed-loop hydraulic automation where compact, high-power rotary actuation is needed. It displaces 56.1 cm³ per revolution, converting fluid energy into shaft torque at a consistent volume ratio. A nominal pressure rating of 400 bar defines its continuous operating limit for circuits that run around the clock. When supplied at 350 bar it delivers 313 Nm of torque, supporting medium-duty drives such as wheel hubs or winches. A top speed of 5000 rpm allows fast shaft rotation without exceeding bearing loads, while a permitted inlet flow of 281 L/min matches pump capacity in high-flow installations. The internal case volume is 0.45 L, which limits residence time of leakage oil and aids cooling. Overall mass is 18 kg, so a single technician can position the unit during machine assembly.

An ISO 3019-2 four-hole mounting flange presents a standardized interface for simple replacement or upgrade in existing frames. The housing tolerates a maximum pressure of 450 bar, providing reserve for transient spikes above the nominal rating. At 400 bar the shaft can produce 357 Nm, giving additional torque for heavy-load starts. Short duty cycles may reach 5500 rpm, extending speed range for brief overruns without thermal damage. A rotor moment of inertia of 0.0042 kg·m² minimizes stored energy and supports rapid control changes. Rotary stiffness is 5.94 kNm per radian, resisting torsional deflection under load so positioning accuracy is maintained. The rotating group endures angular accelerations up to 7500 rad/s², enabling quick direction reversals in servo-controlled hydraulic circuits.