AKM21G-BSMN2-03 Kollmorgen
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The Kollmorgen AKM21G-BSMN2-03 is part of the AKM Synchronous Servo Motors series and features a NEMA flange configuration with a 58mm frame dimension. It uses a Comcoder feedback system with an optical single-turn mechanism and 2048 lines per revolution resolution. The motor is designed without a brake and includes a special shaft detail.
Internal Product Review
The AKM21G-BSMN2-03 is a Kollmorgen AKM synchronous servo motor with a NEMA flange configuration and Comcoder feedback for streamlined machine integration. Single-turn optical feedback and 2048 lines/rev resolution support accurate positioning and stable servo response, making this motor a strong choice for precise motion control.
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Product Description:
The AKM21G-BSMN2-03 is a compact synchronous servo motor produced by Kollmorgen within the AKM Synchronous Servo Motors series. In machine tools, pick-and-place gantries, and small indexing tables, this motor delivers precise velocity and position control while occupying minimal mechanical space. It operates as part of a closed-loop drive system in which the integrated feedback element supplies real-time rotor data to the controller, allowing accurate motion profiles, stable low-speed regulation, and coordinated axis movement in industrial automation cells. Its compact format also suits equipment layouts where several servo axes are mounted close together and available installation space is limited.
A NEMA flange simplifies mounting to standardized gearboxes or machine frames, while the housing width of 58 mm keeps the motor footprint narrow for dense multi-axis installations. The narrow housing can also help maintain clearance between adjacent motors, cable runs, and guarding. The unit is supplied without a brake, so holding torque must be provided by the drive or an external locking device during power-off conditions. Rotor position is captured at a resolution of 2048 lines/rev, enabling fine interpolation for smooth motion at low speed and repeatable response during short indexing moves. This feedback is generated by a Comcoder, an integrated device that combines commutation signals with incremental channels to reduce wiring and streamline drive setup.
The feedback hardware uses single-turn optical scanning, which reports position over one mechanical revolution and avoids the need for multi-turn memory when retained position beyond one turn is not required. The encoder code EPC 15T identifies the installed feedback option for use with compatible drive systems. The motor uses winding G, which gives the electrical characteristics expected by the matching drive. A special shaft configuration is supplied to accommodate custom couplings or pulley hubs, and the rotor length index of 1 helps keep inertia low for fast acceleration and controlled settling after direction changes.
