Product Description:

The SD-A4.070.030-01.000 is a brushless servo motor from Bosch Rexroth Indramat in the SD Magnet Motors series, intended for positioning and velocity control in automated machinery. This motor converts commanded electrical current into controlled rotary motion for feed axes, indexing units, and other servo-driven machine movements. A 142 mm mounting flange and a housing length of 366 mm allow direct coupling to mid-frame gearboxes or belt drives, while the ferrite magnet rotor supplies stable flux without rare-earth materials. The motor is built as a standard version and uses a keyed 24 × 50 mm shaft, while sealed bearings and the housing construction support operation in machine areas from 0 to 40 °C.

The stator winding is designed for a nominal speed of 3000 rpm. At zero speed, it can produce 7.0 Nm of continuous holding torque from a standstill current of 7.5 A, making it suitable for axes that must resist load without motion. The motor can also accept a peak phase current of 30.0 A during dynamic events, and the generated torque scales linearly with current thanks to a torque constant of 0.93 Nm/A. The three-phase coils have an inductance of 18.7 mH and a resistance of 1.86 Ω, which helps moderate current transients during rapid reversals. This electrical behavior supports predictable motion during starts, stops, and reversing cycles.

The enclosure carries an IP54 rating that blocks dust ingress and splashed fluids, and the frame mass of 23 kg adds thermal ballast during demanding duty cycles. A rotor inertia of 5.88 × 10^-3 kg·m² balances acceleration response with load matching requirements, which is useful on axes that alternate between quick acceleration and steady running. When the shaft reaches operating velocity, the back-EMF rises at 137 V/1000 rpm, which helps match the motor to a compatible inverter while maintaining appropriate DC-bus margins during regenerative braking.