MH-825-D-51-E1 Kollmorgen
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The Kollmorgen MH-825-D-51-E1 is a servo motor from the M Goldline Servo Motors series with a maximum speed of 3000 rpm at 480 Vac and a rated torque of 37.87 N-m at the same voltage. It features a continuous stall torque of 66.3 N-m, peak stall torque of 232 N-m, and has a rotor inertia of 0.0599 kg-m².
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Product Description:
The MH-825-D-51-E1 is a brushless servo motor manufactured by Kollmorgen as part of the M Goldline Servo Motors series. It is intended for closed-loop motion platforms that require precise speed and torque regulation. The unit supplies controlled rotary power to indexing tables, pick-and-place gantries, and other industrial axes. Its brushless design supports responsive motion with reduced wear in repetitive duty cycles.
At its rated operating point on a 400 VAC bus, the motor delivers 40.67 N-m, while the 480 VAC rating is 37.87 N-m; both values are well below the 66.3 N-m continuous stall capability used for static or low-speed duty. Producing this torque requires only 31.9 Arms of continuous stall current thanks to a phase torque constant of 2.08 N-m/Arms. The winding back EMF constant is 126 Vrms/kRPM, which affects commutation voltage and drive sizing. Electrical impedance is shaped by an 11 mH inductance and 0.23 Ω DC resistance, allowing rapid current transitions without excessive losses. This balance helps the motor accept current changes without excessive heating during normal operation. Six interior poles give a moderate electrical frequency, and because the unit is supplied without an encoder, it must be paired with an external feedback device when high-resolution positioning is required. Under 480 VAC supply, the shaft can spin to a maximum of 3000 rpm; the limit is 2700 rpm on 400 VAC.
For intermittent events, the motor withstands a 232 N-m peak stall torque that may be delivered for a few seconds by sourcing up to 117.5 Arms peak current, giving headroom for fast accelerations. Dynamic response is influenced by the rotor’s 0.0599 kg-m² inertia, which stores kinetic energy while still allowing agile reversal when driven by a suitably tuned amplifier. The combination of high peak torque and moderate inertia supports short acceleration bursts in stop-and-go motion systems. The housing retains heat slowly and has a 48 min thermal time constant, so temperature rises gradually during overload conditions.
