Product Description:

The S6M4H is a frameless brushed DC motor manufactured by Kollmorgen and positioned within the ServoDisc Pancake DC Motors series. Using a thin-disk armature and rare-earth magnets, the unit delivers direct rotational power for indexing tables, semiconductor tools, and other automation axes where a short axial length is critical. In an industrial system, it converts drive current into torque that can be coupled to gearheads, belts, or lead screws without adding excessive inertia.

The motor reaches its nominal operating point when a terminal voltage of 17.7 V drives a rated armature current of 5.20 A. Under these conditions, the ironless winding produces a rotor speed of 3000 rpm and delivers 46 W of mechanical output. The torque constant is 3.01 N-cm/A, meaning that every ampere contributes approximately three newton-centimeters of torque, which simplifies current-loop tuning. With an armature resistance of 0.940 ohms, copper loss at the rated current stays within thermal limits. The 3.15 V/krpm back-EMF constant allows the drive to estimate velocity from generated voltage during freewheeling or regenerative operation. Power electronics must supply the required voltage and current while maintaining commutation accuracy across the intended duty range.

When transient loads occur, the motor can absorb impulses up to 151 N-cm by accepting a peak winding current of 51 A. This overload capacity is supported by a low rotor inertia of 0.060 kg-cm², allowing axes to accelerate and decelerate quickly without excessive overshoot. For duty cycles that demand higher surface speeds, the motor permits operation up to 6000 rpm before commutation wear becomes a concern. The motor provides 15 N-cm of continuous torque at 25 °C and 13 N-cm at 40 °C. A separate stall torque of 14 N-cm indicates its sustained holding capability. The flat motor envelope spans 86.1 mm in diameter and measures 40.9 mm in length, supporting installation in compact machine assemblies.