Product Description:

The 9FG is a permanent-magnet DC motor manufactured by Kollmorgen and supplied as part of the ServoDisc Pancake DC Motors series. This flat-profile motor is intended for industrial automation stages that require fast acceleration and limited axial space, such as semiconductor handlers or indexing tables. By combining an ironless armature with rare-earth magnets, the unit delivers smooth torque while keeping detent effects low, which improves control-loop bandwidth in positioning systems.

The housing measures 4.750 in across the frame and only 1.92 in in basic length, so it fits compact mechanical envelopes. A rotor inertia of 0.0052 oz-in-sec² lets the drive react quickly to command changes, reducing settling time. The shaft can carry an axial thrust of 5 lb and a radial side load of 25 lb. The radial load rating applies at an overhung distance of 0.75 in, allowing gears or pulleys to be mounted directly without auxiliary bearings when the permitted load is not exceeded. These load ratings help with coupling selection and prevent external forces from exceeding the supported bearing loads.

Connection to the drive amplifier is made through 6 in leads constructed from 18 AWG stranded wire, providing enough length for routing inside an enclosure while keeping voltage drop low. Four mounting holes sit on a 4.330 in bolt circle and have No. 8-32 UNC-2B threads with a depth of 0.375 in, so the motor can fasten directly to face plates or adapter rings without spacers. The output shaft has a diameter of 0.375 in and extends 1.000 in from the front flange. It also includes a 0.688 in flat that is 0.03 in deep for secure engagement with set-screw hubs. With a basic mass of 3.30 lb, the assembly limits the weight added to moving structures in high-speed axes.