SM 71K-3000 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen SM 71K-3000 is part of the 6SM Synchronous Servo Motors series and has a standard weight of 11.7 kg. This motor features a rated power of 3.0 kW and operates with a supply voltage of 400 V. It provides a rated torque of 9.5 Nm and comes with 6 motor poles.
Internal Product Review
The SM 71K-3000 is a Kollmorgen synchronous servo motor rated at 3.0 kW for 400 V operation. Rated torque of 9.5 Nm and standstill torque of 10.5 Nm give the motor excellent authority in demanding motion applications, making torque performance a key strength.
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Product Description:
The SM 71K-3000 is a brushless servo motor produced by Kollmorgen within the 6SM Synchronous Servo Motors series. Designed for closed-loop positioning and speed control, the unit converts drive output into precise rotary motion for packaging, material-handling, and assembly axes. Its electromagnetic assembly is optimized for medium-power automation tasks that require consistent torque accuracy and rapid response. The brushless design reduces mechanical wear because electronic commutation eliminates the need for brushes. A compatible servo drive regulates motor current according to position and velocity feedback from the connected control system.
The stator is wound for a phase-to-phase supply of 400 V and delivers a continuous mechanical output of 3.0 kW when the winding current is held at the rated 7.6 A. Shaft torque at that operating point reaches 9.5 Nm, while an overload current of 32.0 A can be applied during short acceleration periods. The phase-to-phase inductance is 19.6 mH, and the winding resistance is 1.65 Ω. These electrical values affect current-loop response and help the drive regulate torque with minimal ripple. Standstill operation draws 8.0 A, allowing the motor to hold a stationary load through commanded torque. The motor uses six magnetic poles to support smooth electronic commutation across its operating speed range.
The rotor has a moment of inertia of 20.0 kg·cm², permitting brisk speed changes while keeping vibration low. The motor produces a standstill torque of 10.5 Nm when the commanded current equals the standstill rating. Its torque constant is 1.31 Nm/A, allowing current references from the drive to produce predictable torque changes. Back electromotive force develops at 112 V/1000 rpm, providing the controller with adequate voltage margins during regenerative operation. Static friction is limited to 0.23 Nm, reducing the corrective torque needed for fine positioning. The laminated core has a thermal time constant of 25 minutes, which characterizes the winding temperature response during operation. The complete motor has a mass of 11.7 kg.
