Product Description:

The MX93-FF-402U is a hazardous-duty stepper motor produced by Kollmorgen within the MX Hazardous Duty Stepper Motors series. It operates as a two-phase positioning device. The motor converts digital pulse trains from a drive into precise shaft motion for valve actuation, indexing tables, or packaging axes that must operate in classified industrial zones. This arrangement suits motion tasks that rely on repeatable incremental movement and steady holding behavior during stops.

This motor advances in 1.8° increments, giving 200 full steps per revolution and a step accuracy of ±3%, so control systems can resolve positions without external feedback. A holding capability of 550 oz-in enables the shaft to resist back-driving when power is removed, while the rotor inertia of 0.0265 oz-in-s² limits overshoot during high-speed starts and stops. The electromagnetic circuit draws a phase current of 7.0 A, and the winding has 0.16 ohms of resistance with 2.0 mH of inductance. Two phases energized in sequence produce the commanded torque profile. The 50 lb axial and 25 lb radial load ratings help keep bearing loads within intended limits during belt or gear attachment.

An insulation system rated at 100 megohms leakage and capable of withstanding 340 Vdc provides dielectric separation between the windings and frame, which is important when the installation shares conduits with higher-voltage equipment. The insulation barrier also helps limit unwanted leakage paths between energized conductors and the housing. Thermal design is characterized by a 2.1 °C/W winding-to-ambient path, and this value allows surface temperatures to be estimated from RMS losses during operation. The laminated stator and frame assembly weighs 11 lb, so mounting plates can be sized without unnecessary overbuild. The motor’s mechanical envelope supports direct-coupled or belt-driven applications where compact hazardous-duty motion is required.