U16M4HT Kollmorgen
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The Kollmorgen U16M4HT is a DC motor from the ServoDisc Pancake DC Motors series with a rated power output of 872 watts and a rated speed of 3000 RPM. It delivers a continuous stall torque of 324 N-cm and has a peak torque of 3397 N-cm, while weighing 8.5 kilograms. The motor has an outer diameter of 187.2 mm and an overall length of 77.0 mm.
Internal Product Review
The U16M4HT is a Kollmorgen ServoDisc Pancake DC motor with 872 W rated power output and 3000 RPM rated speed. Continuous stall torque of 324 N-cm supports steady loading, while 3397 N-cm peak torque gives the motor excellent dynamic response. A 35.80 V/KRPM back EMF constant further highlights the motor’s precise servo performance.
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Product Description:
The U16M4HT is a brush-type ServoDisc pancake DC motor manufactured by Kollmorgen for the ServoDisc Pancake DC Motors series. It converts armature current into direct rotary output for compact conveyors, pick-and-place heads, and test fixtures. An outside diameter of 187.2 mm combined with an overall length of 77.0 mm gives the motor its low axial profile, allowing it to be mounted close to the load without right-angle gear sets. This geometry also accommodates integral tachometer feedback when precise speed regulation is required.
At the nominal operating point, the armature reaches a rated speed of 3000 rpm while supplying 872 W of mechanical power and 324 N-cm of continuous stall torque. These operating values are achieved with a rated terminal voltage of 116.7 V and a rated continuous current of 8.99 A flowing through an armature resistance of 0.880 Ω. The motor produces 34.21 N-cm of torque per ampere, allowing the drive electronics to calculate acceleration from the commanded current. Its back-EMF constant is 35.80 V/krpm and corresponds to the motor’s torque constant. At the maximum recommended speed of 6000 rpm, the integral tachometer generator provides a proportional speed signal for closed-loop control with an output constant of 17.90 V/krpm.
During brief dynamic events, the armature can produce 3397 N-cm of peak torque by accepting 101 A for short periods. The low-mass disc rotor has a moment of inertia of 7.91 kg-cm², allowing axes to reverse quickly with reduced resistance to changes in speed. The complete motor weighs 8.5 kg, supporting direct installation on compatible linear stages and compact machine assemblies. ServoDisc construction keeps the copper paths short, which minimizes electrical losses and assists heat dissipation during operation. The flat housing also leaves space around the motor for cable routing and forced-air circulation when additional airflow is used.
