M-605-B-21-B3E102 by Kollmorgen

Kollmorgen manufactures the M-605-B-21-B3E102 servo motor in its M Goldline Servo Motors series. This frameless permanent-magnet unit is supplied for applications that need fast position loops and smooth torque delivery. By receiving three-phase power from a compatible drive, it produces rotational motion for robotics joints, pick-and-place heads, and other precision loads. Its construction pairs rare-earth magnets with tight feedback resolution, enabling high-bandwidth control while keeping the motor compact for integration in tightly packed industrial equipment.

For continuous operation, the windings demand a line current of 27.7 A RMS, a figure that indicates the thermal load on the copper conductors and helps determine drive sizing. At the same 25 °C mounting surface temperature, the motor can deliver a steady shaft torque of 31.8 N-m, enough to move medium-inertia loads without overheating. Electrical insulation must withstand a maximum line-to-line potential of 250 VRMS, so cables and connectors are selected for this voltage class. Rated mechanical output reaches 7.7 kW when the rotor runs at 3150 RPM, allowing direct coupling to pumps or rollers that require high power density.

When ambient temperature rises to 40 °C, continuous torque shifts to 30.1 N-m, indicating the derating applied to protect the insulation system. The six-pole magnetic design, identified by 6, creates three electrical cycles per mechanical revolution and shapes the commutation frequency presented to the drive. For short transients, the amplifier may supply up to 84.8 A RMS, letting the motor reach a peak shaft output of 87.7 N-m for rapid acceleration or disturbance rejection. These peak values are limited to brief duty cycles so internal temperature stays within the safe range set by the continuous ratings.