M-605-B-21-B3E1 Kollmorgen
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The Kollmorgen M-605-B-21-B3E1 is part of the M Goldline Servo Motors series and has a rated power of 7.7 kW with a rated speed of 3150 RPM. This servo motor offers a continuous torque of 31.8 Nm at 25°C and a peak torque of 87.7 Nm. It features a back EMF of 65.9 V RMS per kRPM and weighs 63 pounds.
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Product Description:
The M-605-B-21-B3E1 is a permanent-magnet AC servo motor produced by Kollmorgen within the M Goldline Servo Motors series. It is intended for closed-loop motion tasks in automated cells, machining centers, and material-handling equipment that require precise torque and velocity regulation. Its permanent-magnet rotor and electronic commutation support responsive acceleration, controlled deceleration, and accurate positioning under changing mechanical loads. The standardized Goldline mechanical outline supports compatible mounting arrangements across medium- and heavy-duty industrial axes without requiring extensive changes to the machine frame.
Under steady-state conditions, the motor supplies 31.8 N·m of continuous shaft torque at a winding temperature of 25 °C while drawing a continuous line current of 27.7 A. The stator has an inductance of 6.3 mH, which influences the electrical time constant and current-loop response. At its maximum rated speed of 3150 rpm, the six-pole rotor maintains smooth rotation throughout the operating range. A torque constant of 1.09 N·m/A RMS relates the applied current to the torque produced at the shaft. The back EMF coefficient is 65.9 V RMS/kRPM, allowing the connected amplifier to account for generated voltage as rotational speed increases. These electrical characteristics help the drive regulate motor current while maintaining suitable voltage margins on the DC bus.
During sustained operation at an ambient temperature of 40 °C, the available continuous torque decreases to 30.1 N·m. For short acceleration intervals, the windings can accept a peak line current of 84.8 A, permitting the motor to produce up to 87.7 N·m of peak torque. The rated output power is 7.7 kW, making the motor suitable for coordinated axes powered by compatible midrange servo amplifiers. The motor weighs 63 lb, which must be considered when selecting mounting hardware and calculating structural loads on the machine. Fuse sizing, bus capacitance, and thermal protection settings should account for the short-duration current and torque loads without treating them as continuous operating values.
