U9M4T Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen U9M4T is part of the ServoDisc Pancake DC Motors series and has a diameter of 111 mm with a length of 47.2 mm. It offers a continuous stall torque of 26 N-cm and a rated continuous current of 8.63 Amps. The motor has a rated power output of 102 Watts and a maximum recommended speed of 6000 RPM.
Internal Product Review
The U9M4T is a Kollmorgen ServoDisc pancake DC motor with a rated power output of 102 W and a rated speed of 3000 RPM. Peak torque of 306 N-cm and a maximum recommended speed of 6000 RPM provide excellent dynamic range for demanding servo applications.
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Product Description:
The U9M4T is a flat-profile DC motor produced by Kollmorgen within the ServoDisc Pancake DC Motors series. Its frameless disk armature allows the unit to deliver torque in tight axial spaces, making it suitable for semiconductor handlers, small gantries, and other industrial automation axes that cannot accommodate conventional cylindrical motors. By combining low inertia with a brushed commutation system, the motor responds quickly to current commands from a servo drive. This responsive design supports precise velocity and position control when the motor is integrated into a feedback-regulated motion loop.
Its 111.0 mm outer diameter and 47.2 mm body length provide a compact geometry that allows the housing to fit directly into wafer-handling platens or indexing fixtures. The armature inertia is 0.59 kg-cm², so acceleration transients are short when the motor is paired with light loads. Electrical performance includes a torque constant of 4.30 N-cm/A and a back EMF slope of 4.50 V/krpm, allowing the drive to regulate torque and monitor speed-related voltage. The rated terminal voltage is 22.9 V, while the winding resistance is 0.850 Ω, which helps limit resistive losses during operation. The maximum speed is 6000 rpm, below which commutation remains stable and brush wear remains predictable.
Under continuous duty at 25 °C, the motor produces a rated torque of 32 N-cm while drawing 8.63 A. It delivers a rated shaft output of 102 W at 3000 rpm, providing useful power for compact positioning and speed-controlled axes. Short-duration load demands can be supported by a peak torque of 306 N-cm. For near-static applications, the continuous stall torque of 26 N-cm indicates the torque that can be maintained without overheating under the stated operating conditions. A tachometer winding supplies 2.25 V/krpm for speed feedback, allowing the connected controller to detect velocity changes directly. The motor has a mass of 2.0 kg, which must be considered when it is installed on moving structures or compact machine assemblies.
