MS2M04-A0FNN-KMDH0 by Bosch Rexroth Indramat

The MS2M04-A0FNN-KMDH0 is an ultra-compact servo motor produced by Bosch Rexroth Indramat within the MS2M Ultra Compact Motors series. As a frameless size-4, length-A unit, it supplies closed-loop rotary motion for positioning tables, pick-and-place heads, and other precision axes that rely on quick dynamic response and limited installation space. An optical 23-bit single-turn and multi-turn encoder feeds high-resolution feedback to the drive controller, while the plain shaft and natural-convection housing keep the overall envelope small for tight machine interiors.

The housing carries a protection rating of IP65, so airborne dust and low-pressure water jets cannot reach internal windings or bearings. Under rated conditions, the rotor outputs 0.75 kW of mechanical power at a rated speed of 3000 rpm, yielding a continuous torque of 2.39 Nm. When short overloads occur, the drive can command up to 12.3 A. At that current, the motor produces a peak torque of 7.16 Nm, giving additional headroom for rapid acceleration. Quick-lock SPEEDCON M17 connectors provide tool-free hookup of power and encoder leads, and the double metal cable option adds shielding against electrical noise during high-frequency duty cycles.

The electrical constants frame how the servo amplifier regulates current. A torque constant of 0.59 Nm/A links commanded phase current directly to output torque, while a phase inductance of 5.10 mH and a phase resistance of 0.57 ? influence current rise time and resistive heating. Operation without a holding brake reduces inertia, and the rotor's low-inertia design favors fast start-stop sequences. Natural convection cooling supports continuous running in ambient temperatures from 0 °C to 40 °C, and the 65 dB(A) sound level keeps acoustic output moderate. Five pole pairs, a 4.75 to 5.25 V encoder supply, and SPEEDCON connectors complete the electrical interface needed for integration with Bosch Rexroth servo drives.