Product Description:

The S9M4H is a permanent-magnet DC motor built by Kollmorgen and supplied under the ServoDisc Pancake DC Motors series. This flat-profile unit delivers direct torque from a compact 111 mm frame, allowing installation in indexing tables, semiconductor handlers, or robotic joints where axial space is restricted. In an automation cell, it converts electrical power from a low-voltage drive into rotary motion that can be controlled through a closed loop for position, speed, or tension applications. Its pancake-style layout is particularly useful when the available mounting diameter is less restrictive than the permitted motor length.

At 25 °C, the motor produces a continuous shaft torque of 60 N-cm while operating at a rated speed of 3000 rpm. This operating point allows the motor to maintain steady output without exceeding the permissible winding temperature. Response to acceleration commands is supported by a rotor inertia of 0.395 kg-cm², helping the axis reach its commanded speed quickly. Internal copper loss is influenced by a winding resistance of 0.850 ohms. The motor has a torque constant of 8.41 N-cm/A, providing a predictable relationship between supplied current and generated torque.

For higher-duty operating periods, the motor supports a mechanical output of 187 W and can deliver a short-duration surge torque of 650 N-cm when the drive supplies up to 79 A. Under continuous load, the armature draws 7.79 A, while its back EMF constant is 8.80 V/krpm for compatibility with low-voltage servo controllers. The commutation and bearing assembly permits rotation at speeds up to 6000 rpm. The terminals accept a nominal bus voltage of 34.0 V, placing the motor within common 24-48 V motion-control platforms used in mobile or collaborative equipment. Radial and axial shaft loads are each limited to 25 lb. A stack length of 57.9 mm maintains the flat geometry required for disk-style actuators and other installations with limited axial clearance.