AA2FM180/61W-VSD520

The AA2FM180/61W-VSD520 motor belongs to the A2FM Fixed Motors series from Bosch Rexroth and serves as a compact power source for hydraulic automation where continuous rotation is driven directly by system pressure. Its displacement of 180 cm³ per revolution defines the amount of fluid converted into shaft movement each cycle and helps size the pump that supplies it. Bidirectional rotation allows the same unit to accommodate forward and reverse flow without mechanical changes. A nominal pressure limit of 400 bar supports steady-state operation in heavy-duty loops, while the maximum pressure rating increases tolerance to 450 bar during transient peaks. The total pressure limit of 700 bar safeguards the housing against the combined high-side and low-side loads that occur during extreme load reversals. The high-pressure side must stay above 25 bar to keep internal components properly balanced and lubricated. At this pressure the motor can deliver 1146 Nm of torque, supplying direct drive force to winches, wheels, or track drives. To achieve rated output the inlet flow needs to reach 648 l/min, allowing designers to match pump capacity to required speed and torque.

Maximum speed of 4000 rpm supports high rotational velocity for fast-cycling machinery, and a permitted angular acceleration of 3500 rad/s² lets the drive train ramp up quickly during indexing sequences. The rotor’s moment of inertia is 0.022 kg·m² so control systems can predict acceleration forces accurately. Rotary stiffness of 18.2 kNm/rad keeps torsional deflection low, helping maintain precise positioning under fluctuating load. Continuous case differential pressure is limited to 2 bar to prevent seal extrusion, and short pressure peaks up to 10 bar are allowed during rapid load changes. HLP hydraulic fluid conforming to DIN 51524 is specified to provide the viscosity and lubrication properties required by the hydrostatic bearings. FKM seals are used to resist the temperature and chemical characteristics of this oil and extend service life. Together these parameters define safe operating boundaries and ensure the motor integrates efficiently into automated hydraulic circuits.