Bosch Rexroth | AA2FM2861W-VSD530
AA2FM28/61W-VSD530
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The AA2FM28/61W-VSD530 motor is produced by Bosch Rexroth for the A2FM Fixed Motors series and supports hydraulic automation where a constant displacement unit is required. Its geometric displacement is 28.1 cm³ per revolution, defining the fixed volume transferred with each shaft turn. A nominal speed of 6 300 rpm allows high rotational rates, while an inlet flow of 177 l/min at that speed keeps medium-flow circuits supplied. The motor withstands 400 bar nominal pressure and produces 179 Nm of torque at that value, providing reliable torque density. A moment of inertia of 0.0012 kg·m² enables fast speed changes with limited energy, rotary stiffness of 2.93 kNm/rad maintains alignment under load, and a maximum angular acceleration of 6 500 rad/s² supports quick response in dynamic duty cycles.
The internal case volume is 0.2 l, giving room for leakage oil and thermal expansion. Case differential pressure is restricted to 2 bar so a drain line must keep housing pressure low, and a 10 bar case pressure peak can be accepted briefly during transients. The high-pressure side must stay above 25 bar to keep hydrostatic bearings stable, and the motor tolerates 450 bar maximum working pressure for short overloads. Total pressure across the unit can reach 700 bar in extreme conditions, establishing the absolute safety limit. Pressure rise rates up to 16 000 bar/s are permissible when no relief valve is installed, accommodating rapid control actions. These boundaries define the fluid and mechanical limits that ensure dependable operation in demanding hydraulic drive systems.
Technical Specifications
Case Differential Pressure
2 bar
Case Pressure Peak
10 bar
Case Volume
0.2 l
Geometric Displacement
28.1 cm³/rev
Inlet Flow At Nnom
177 l/min
Max Angular Acceleration
6500 rad/s²
Maximum Pressure
450 bar
Min High-pressure Side
25 bar
Moment Of Inertia
0.0012 kg·m²
Nominal Pressure
400 bar
Nominal Speed
6300 rpm
Rate Of Pressure Change (no Prv)
16000 bar/s
Rotary Stiffness
2.93 kNm/rad
Torque At Nominal Pressure
179 Nm
Total Pressure
700 bar
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