Product Description:

The MX111-FF-401EU is a hazardous-duty stepper motor manufactured by Kollmorgen within the MX Hazardous Duty Stepper Motors series. As a two-phase unit, it converts discrete current pulses from an indexer or drive into incremental mechanical rotation, allowing position control in automation zones where flammable gases or dust may be present. The rear shaft is extended so that feedback devices or mechanical loads can be coupled at either end, and the motor’s ±5% step accuracy supports repeatable indexing tasks on conveyors, valve actuators, and batching stations during repeated start-stop cycles.

This model fits a NEMA 42 (110 mm) frame, giving a mounting footprint suited for large machinery while preserving interchangeability with standard face plates. It develops a holding torque of 6.0 N·m, which is the maximum static torque available when the windings are energized and the rotor is locked. Each phase draws 1.1 A/phase under rated conditions, and the 3.6 Ω phase resistance works with the thermal resistance of 7.4 °C/W to manage heat. A winding inductance of 16 mH shapes the electrical time constant, smoothing current transitions between full-step and microstep operation. The insulation system is designed for 340 Vdc and has an insulation resistance of 100 MΩ, providing dielectric margin for drive topologies that use high-voltage DC buses.

The mechanical load limits are 222 N axially and 111 N radially, so pulley tension or thrust screw forces must remain within these values to avoid premature bearing wear. Each electrical cycle advances the rotor by 1.8°, resulting in 200 discrete steps per revolution, which simplifies open-loop positioning when encoders are not used. With a phase count of two, low detent torque, and 16 mH inductance, the motor balances damping and responsiveness for moderate-speed start-stop applications where overshoot must be minimized.