Product Description:

The SR-A2.0020.030-14.080 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SR Synchronous Servo Motors series. It attaches to machinery through a 100 mm flange and converts DC power from a compatible drive into regulated mechanical motion for industrial axes that require high positional accuracy and quick response. Resolver feedback and dual NTC winding sensors let the controller monitor rotor position and winding temperature in real time. That combination supports stable commutation during speed changes and helps protect the motor before insulation temperature rises too far.

The motor reaches a rated speed of 3000 rpm, and its torque rises in proportion to phase current at a constant of 1.5 Nm/A. When the axis stops, a holding brake provides 3.2 Nm of torque, and the brake is energized from a dedicated 24 VDC supply that tolerates ±10% voltage variation and 5% ripple while drawing 0.56 A. Main power is supplied through the intermediate circuit at 670 VDC, which supports stable speed control without excessive current. Resolver feedback delivers 8192 increments per revolution with a precision of ±10 angular minutes, so the drive receives fine commutation data for smooth low-speed rotation. Two NTCs in the stator windings report thermal rise to the controller so it can reduce output before the insulation approaches its Class F limit.

The brake has an inertia of 0.4 × 10^-4 kg·m² and a mass of 0.35 kg, which keeps the added rotating load low during acceleration and deceleration. Locked-rotor testing records a stall current of 1.3 A and a resisting torque of 2.0 Nm, giving the drive clear reference points for current limiting and overload response at low speed. These values also help describe how the brake and rotor affect short indexing moves, especially when rapid starts and controlled stops are required. During repeated indexing, the added brake load remains modest, so acceleration response is less affected than it would be with a heavier brake assembly.