Bosch Rexroth | AA2FM2861W-VSD540
AA2FM28/61W-VSD540
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The AA2FM28/61W-VSD540 fixed displacement motor belongs to the A2FM Fixed Motors series manufactured by Bosch Rexroth for hydraulic automation systems that require compact, high-speed rotary output. Its displacement is 28.1 cm³ per revolution, which sets the basic flow-to-speed relationship between the pump and the motor. A nominal speed of 6300 rpm defines the highest continuous shaft velocity. To sustain that velocity the inlet flow must reach 177 L/min, so the supply pump must be sized to match. The motor delivers 179 Nm of torque when operated at the nominal pressure. That nominal pressure is 400 bar, marking the main operating limit for continuous duty. Operation can be extended up to 450 bar, which is the maximum pressure allowed for short-term overloads. Uniform motion begins at 50 rpm, ensuring usable output at very low speeds.
The internal case volume of 0.2 L limits oil accumulation and aids thermal stability. A continuous case differential pressure of 2 bar maintains lubrication flow across the bearing set, and the housing can endure peak case pressure up to 10 bar during transient load spikes. The rotary group moment of inertia is 0.0012 kg·m², enabling rapid speed changes; this low inertia works with a maximum angular acceleration of 6500 rad/s² to support fast duty cycles. Rotary stiffness of 2.93 kNm/rad reduces torsional deflection under load. A summation pressure rating of 700 bar defines the combined load limit when multiple hydraulic circuits interact. The motor requires at least 25 bar of high-side pressure to keep the hydrostatic balance stable.
Technical Specifications
Case Differential Pressure (continuous)
2 bar
Case Pressure Peak
10 bar
Case Volume
0.2 L
Displacement
28.1 cm³/rev
Inlet Flow At Nominal Speed
177 L/min
Max Angular Acceleration
6500 rad/s²
Maximum Pressure
450 bar
Minimum High-pressure (php Min)
25 bar
Minimum Speed For Uniform Motion
50 rpm
Moment Of Inertia (rotary Group)
0.0012 kg·m²
Nominal Pressure
400 bar
Nominal Speed
6300 rpm
Rotary Stiffness
2.93 kNm/rad
Summation Pressure (psu)
700 bar
Torque At Nominal Pressure
179 Nm
1620 Old Apex Road
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