Product Description:

The AKM21E-ENMNEH-00 is a compact synchronous servo motor produced by Kollmorgen as part of the AKM Synchronous Servo Motors series. It is intended for closed-loop positioning and speed control in light-duty industrial axes where limited space and fast response are required. The unit uses winding designation E and rotor length index 1 to keep inertia low. Its smooth shaft supports direct coupling to precision gearheads or pulleys without keyways, making the motor suitable for semiconductor tooling, laboratory automation, and miniature pick-and-place stations.

At continuous load, the motor produces 0.5 Nm while drawing 3.11 Arms, which gives a stable operating point for small servo axes. For short acceleration periods, it can deliver up to 1.49 Nm with 12.4 Arms of phase current. A back electromotive force constant of 10.2 Vrms/kRPM supports matching with AKD drives, while the phase resistance of 3.42 Ω and torque constant of 0.16 Nm/Arms help the controller regulate current and torque smoothly. Dual Molex power and feedback connectors simplify wiring, and the motor has no integral brake, which keeps the overall length and mass low. Static friction is 0.002 Nm and viscous damping is 0.0046 Nm/kRPM, which supports predictable low-speed motion. The encoder provides 5000 lines per revolution for accurate commutation and repeatable position tracking.

The motor reaches a rated mechanical speed of 2000 rpm when supplied from a 75 V DC bus, which suits low-voltage platforms and compact test equipment. A phase inductance of 5.2 mH helps smooth current ripple so the controller’s sinusoidal output remains stable during operation. Thermal behavior is managed over a time constant of 8 min, allowing brief overload periods without overstressing the insulation system. On the feedback side, the drive interprets position data at an internal resolution of 20,000 counts per revolution, supporting smooth velocity control and precise low-speed movement. The low-inertia rotor also helps the axis respond quickly during short indexing moves and frequent direction changes.