Product Description:

The SD-A4.140.020 01.104 is a brushless servo motor from Bosch Rexroth Indramat’s SD Magnet Motors series. As a permanent-magnet, ferrite-based actuator, it supplies closed-loop torque and speed to automated machinery. This allows numeric controllers to position tool heads, conveyors, or pick-and-place axes with repeatable accuracy in industrial environments.

At its nominal speed of 2000 rpm, the rotor maintains synchronism with the drive while the stator windings generate a standstill torque of 14.0 Nm for holding or low-speed creep. Producing that torque at zero speed requires a standstill current of 9.8 A, a value set by the 1.88 Ω phase resistance and the ferrite magnet flux. The end-shield follows the IM B5 construction so the motor mounts on a spigot face, and the housing carries an IP54 rating that blocks dust ingress and sprayed water. A back-emf coefficient of 206 V/1000 rpm informs the drive’s voltage ceiling, while an electrical time constant of 11.0 ms indicates how quickly phase current can ramp after a command step. The integral tacho generator needs a minimum 20 kΩ load for linear feedback, and the 20,000 h bearing life supports long maintenance cycles.

For rapid indexing, the amplifier may deliver up to 34.3 A peak, exploiting the 1.43 Nm/A torque constant to overcome inertia. Heat builds gradually because the motor’s thermal time constant is 130 min, permitting intermittent overload without immediate derating. A stator inductance of 20.6 mH filters switching harmonics and affects the current loop bandwidth, while the 7.7 ms mechanical time constant shows that speed changes follow electrical commands with minimal lag. The motor is intended for continuous, precise motion in automated assembly lines and material-handling cells.