HSM835 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
MPN: M.1015.8016
The Kollmorgen HSM835 is part of the HSM Brushless Servo Motors series and features a continuous torque of 39.5 Nm with a peak torque of 70.1 Nm. This servo motor weighs 44.1 kg and has a motor length of 375 mm. It provides a torque constant of 0.94 Nm per amp and a back EMF constant of 104 V per kRPM.
Internal Product Review
The HSM835 is a Kollmorgen brushless servo motor that stands out with 39.5 Nm continuous torque and 70.1 Nm peak torque for demanding motion axes. A 0.94 Nm/A torque constant paired with 0.00632 kg-m2 rotor inertia supports responsive servo tuning and stable acceleration behavior. The 104 V/kRPM back EMF constant highlights a well-balanced electromagnetic design.
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Product Description:
The HSM835 brushless servo motor is manufactured by Kollmorgen for the HSM Brushless Servo Motors series. It supplies precise velocity and position control for automated production lines, indexing tables, and robotic joints. A 265 mm bolt circle and 375 mm housing length accommodate large-frame machines, while four 15 mm mounting holes secure the stator to rigid frames. The shaft terminates in an M8 × 1.25 mm thread with 20 mm of usable depth, making it straightforward to attach couplings, brakes, or belt pulleys without additional adapters.
The motor provides a continuous torque of 39.5 Nm, supporting sustained loads without exceeding its rated temperature. During acceleration or brief overloads, the electromagnetic assembly can deliver up to 70.1 Nm, providing additional torque for rapid starts. The relationship between electrical current and mechanical torque is represented by a torque constant of 0.94 Nm/A, so every ampere supplied by the drive produces nearly one newton-meter at the shaft. The generated back electromotive force scales at 104 V/kRPM, which is important when selecting the DC-bus voltage for the drive inverter. Copper losses remain modest because the phase resistance is only 0.13 ohm, helping the motor maintain efficiency during continuous operation.
The rotating assembly has an inertia of 0.00632 kg·m², enabling quick speed changes while limiting overshoot when the motor is paired with a compatible drive. The windings have an inductance of 2.5 mH, which influences current-loop bandwidth and requires appropriately tuned control filters. The cast-iron and steel construction gives the motor a total mass of 44.1 kg, providing mechanical damping that can reduce vibration in large gantry axes. The radial bearings tolerate loads up to 495 lb at 500 rpm, allowing belt tensioners or overhung sprockets to be applied directly to the shaft without auxiliary support brackets. This radial load capacity applies at the stated operating speed and should be considered when arranging belt-driven or offset mechanical loads.
