U9M4HT Kollmorgen
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The Kollmorgen U9M4HT is a ServoDisc Pancake DC Motor with a diameter of 111.0 mm, a length of 61.2 mm, and a weight of 2.4 kg. It delivers a rated power output of 159 W, rated speed of 3000 RPM, and a peak torque of 470 N-cm. The motor operates at a rated current of 8.51 A and has a rated voltage of 29.9 V.
Internal Product Review
The U9M4HT is a Kollmorgen ServoDisc Pancake DC motor that stands out for efficient continuous operation with 159 W rated power output at 3000 RPM. Peak torque of 470 N-cm and tach linearity of 0.06% support precise motion response in demanding servo applications. Strong choice for compact high-performance drive systems.
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Product Description:
The U9M4HT is a brush-type DC motor produced by Kollmorgen within the ServoDisc Pancake DC Motors series. As a flat disk-armature unit, it fits automation axes with tight axial envelopes that require direct torque for positioning tables, pick-and-place heads, and similar equipment. The motor converts low-voltage supply power into rotary motion through its ironless armature, allowing fast electrical response and precise speed regulation by a companion drive amplifier.
The motor reaches a rated speed of 3000 rpm while supplying 51 N-cm of continuous torque at 25 °C. This output requires 8.51 A, with current affected by the circuit’s 0.850 ohms of terminal resistance and the armature’s heating capacity. During generator operation, the winding produces 6.87 V/krpm of back EMF that the controller must overcome to maintain the set speed. The housing measures 111.0 mm in diameter and 61.2 mm in length, creating a compact profile for installation in confined machine frames. A moment of inertia of 0.59 kg-cm² allows the axis to accelerate quickly, while the rated voltage of 29.9 V is suitable for motion buses operating between 24 V and 36 V. The tachometer has a linearity of 0.06% and an output constant of 3.43 V/krpm, supporting accurate speed feedback. The thermal resistance at stall is 2.40 °C/W, so forced airflow may be necessary during high-duty operation to control case and winding temperatures.
For short impulses, the armature can deliver up to 470 N-cm, helping machinery overcome breakaway loads without requiring a larger motor frame. Steady operation provides a mechanical output of 159 W for compact motion systems that require sustained rotary power. The electromagnetic design provides a torque constant of 6.57 N-cm/A, allowing straightforward current-mode control because the produced torque increases linearly with commanded current. The motor has a mass of 2.4 kg, permitting direct installation on moving gantries and other mechanisms where a low moving load supports rapid acceleration and deceleration.
