Bosch Rexroth | AA2FM12561W-VSD527
AA2FM125/61W-VSD527
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The AA2FM125/61W-VSD527 hydraulic motor originates from Bosch Rexroth and is part of the A2FM Fixed Motors series. It serves as a compact power unit for closed-loop hydraulic automation where constant displacement guarantees predictable actuator motion. The unit offers a displacement of 125 cm³ per revolution to define a fixed volume ratio between input flow and output torque. Bidirectional rotation lets machinery reverse without valve changes. At a nominal speed of 4000 rpm, the motor can accept 500 l/min of inlet flow for high-throughput circuits. When pressurized to the nominal 400 bar, it produces 796 Nm of torque for winches, track drives, or presses. The design tolerates brief system peaks to 450 bar, and a minimum high-pressure side of 25 bar keeps internal bearings lubricated during low-load operation.
Additional mechanical data support dynamic duty cycles encountered in automated equipment. A maximum angular acceleration of 4500 rad/s² allows rapid speed changes, while a rotor moment of inertia of 0.0116 kg·m² limits start-up energy demand. Installation aligns with an ISO 3019-2 four-hole mounting flange so the motor can replace standardized units without adapter plates. Housing integrity is preserved by restricting case differential pressure to 2 bar, with short spikes up to 10 bar permitted for less than 0.1 s. An FKM shaft seal withstands hot mineral oils and prevents leakage during continuous service. For safety calculations, designers can reference a total pressure ceiling of 700 bar when evaluating extreme load scenarios in hydraulic automation circuits.
Technical Specifications
Direction Of Rotation
Bidirectional
Displacement
125 cm³/rev
Inlet Flow At Nominal Speed
500 l/min
Max Angular Acceleration
4500 rad/s²
Max Case Differential Pressure
2 bar
Maximum Pressure
450 bar
Min High-pressure Side (php Min)
25 bar
Moment Of Inertia
0.0116 kg·m²
Mounting Flange
ISO 3019-2 4-hole
Nominal Pressure
400 bar
Nominal Speed
4000 rpm
Peak Case Pressure (t < 0.1 S)
10 bar
Seal Material
FKM
Torque At Nominal Pressure
796 Nm
Total Pressure (psu)
700 bar
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