KSM02.1B-041C-42N-S1-HG0-ET-L3-D7-AN-FW by Bosch Rexroth Indramat

The KSM02.1B-041C-42N-S1-HG0-ET-L3-D7-AN-FW is a motor-integrated servo drive produced by Bosch Rexroth Indramat for the KSM Motor Integrated Servo Drives series. By combining power electronics, feedback, and a 041-frame synchronous motor in one housing, it streamlines decentralized motion axes on machines and assembly stations. The device mounts directly on the machine, eliminating the need for a separate drive cabinet while still providing closed-loop velocity and position control for automated production lines.

The drive connects through a single hybrid connector that carries power, signals, and fieldbus conductors, simplifying cable runs. Its internal inverter operates from a 750 V DC supply, matching standard Rexroth 24 kW DC bus segments and allowing long shared links between drives. Cooling is handled by natural convection, so no fans are needed, and the aluminum body dissipates heat into the surrounding air. The motor section uses winding code 42 for nominal torque matching, has a frame length of C, and is produced in design version 1. The ATEX version supports operation in designated hazardous areas. A shaft seal protects the plain output journal, and the unit has a Basic performance level within Series 2 of the platform.

Rotor position is measured by a Hiperface optical encoder that produces 128 signal periods per revolution. It is configured for single-turn position data, providing precise commutation feedback without multi-turn counting. Command traffic is routed over a Multi-Ethernet interface that supports Sercos, EtherNet/IP, PROFINET, and EtherCAT without hardware changes. Functional safety is provided by Safe Torque Off (STO), which removes drive torque after receiving a certified safety input and meets SIL 2 requirements. The output uses a plain shaft. The mechanical assembly is supplied without a holding brake, so an external device must retain vertical loads when power is removed.