SR-A3.0042.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SR-A3.0042.030-04.000 is a synchronous servo motor from the SR Synchronous Servo Motors series. This model features a rated speed of 3000 min^-1 and offers a holding brake torque of 10 Nm with a brake supply voltage of 24 VDC. It has a resolver encoder type with a resolution of 8192 increments per revolution and has a rotor inertia of 0.0007 kgm2.
Internal Product Review
The SR-A3.0042.030-04.000 is a Bosch Rexroth Indramat synchronous servo motor with a rated speed of 3000 min^-1 and a resolver encoder with 8192 incr./rev. A 10.0 Nm holding brake and 1.6 Nm/A torque constant give the motor confident axis control and efficient servo response, making the unit a strong choice for precision motion systems.
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Product Description:
The SR-A3.0042.030-04.000 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. As an electrically commutated unit, it converts drive current into controlled shaft torque and speed for positioning tasks on packaging lines, pick-and-place axes, and other CNC assemblies. The SR-A3.0042.030-04.000 incorporates a permanent-magnet rotor and an integral holding brake that secures the load whenever system power is removed.
The motor reaches a rated speed of 3000 rpm, supporting rapid operating cycles while keeping mechanical resonance below critical limits. A torque constant of 1.6 Nm/A links commanded phase current to output torque, giving the drive predictable control during setup and operation. During static holding, the inverter may supply a continuous standstill current of 3.4 Arms to counter external forces without overheating the stator. If the shaft is prevented from turning at startup, the motor can produce a locked-rotor torque of 3.7 Nm at a corresponding locked-rotor current of 2.3 A. This torque can hold the connected transmission until normal shaft motion begins. The 19 mm keyed shaft transfers torque directly to couplings, while a rotor inertia of 0.0007 kg·m² balances responsiveness with rotational stability.
The integrated brake supplies 10.0 Nm of static holding torque and is released by a coil energized with 24 VDC, allowing connection to common machine-level power rails. Its inertia of 0.000106 kg·m² adds little rotational load during acceleration and deceleration. Accurate position feedback is delivered by a resolver-based encoder that provides 8192 increments per revolution, enabling precise control at low shaft speeds. The motor weighs 7.6 kg, which reduces the load placed on the mounting surface. Its 262 mm housing length supports installation in machine assemblies with limited axial space. The keyed output shaft provides positive engagement with compatible couplings, and the holding brake prevents unintended movement after electrical power is removed.
