MSM215-221-304-S-2KA Kollmorgen
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MPN: M.1302.1336
The Kollmorgen MSM215-221-304-S-2KA is a servo motor from the MSM Brushless Servo Motors series. It has a rated speed of 3000 rpm, a continuous torque of 25 Nm, and a peak torque of 70 Nm. The motor weighs 29 kg and features single-turn high resolution feedback.
Internal Product Review
The MSM215-221-304-S-2KA is a Kollmorgen brushless servo motor with 25 Nm continuous torque and a 3000 rpm rated speed. Single-turn high-resolution feedback and 70 Nm peak torque support precise motion control and strong transient response. This servo motor stands out as a capable choice for demanding axis applications, especially with its 1.36 Nm/A torque constant.
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Product Description:
The MSM215-221-304-S-2KA is a brushless servo motor from Kollmorgen’s MSM Brushless Servo Motors series. It serves as a rotary actuator in automated machinery, providing closed-loop positioning and velocity control for packaging equipment, gantry axes, and indexing tables. Its brushless design supports precise torque delivery and rapid acceleration during repetitive motion cycles. Electronic commutation allows the connected servo drive to regulate shaft movement without the mechanical wear associated with brushes. The motor is suitable for applications that require controlled starts, stops, and changes in rotational speed.
The motor delivers a continuous torque of 25 Nm, allowing it to hold loads steadily during constant-speed portions of a cycle. During rapid acceleration, the electromagnetic stack can generate up to 70 Nm of peak torque without demagnetization. Rated operation occurs at 3000 rpm, and the back EMF constant is 164 V/KRPM. A torque constant of 1.36 Nm/A relates the commanded phase current to the torque produced by the motor. The windings tolerate a maximum current of 65.1 A peak for short bursts, while the stall current limit is 20.5 A peak for static holding conditions. Six rotor poles support smooth sinusoidal commutation across the operating speed range. The winding resistance is 0.76 Ω, which affects copper losses and torque production as the motor temperature changes.
Rotor inertia is 0.0104 kg·m², balancing responsiveness with damping when the motor drives an attached load. The complete assembly weighs 29 kg, so the machine structure must provide a rigid mounting surface. A winding inductance of 15.8 mH limits rapid current changes and filters high-frequency ripple from pulse-width-modulated drives. Position data are returned through a single-turn high-resolution feedback device, enabling the servo drive to regulate shaft angle and velocity in a closed loop. A 24 VDC brake engages to hold the shaft when the motor is used on a vertical axis. The shaft includes an M12 × 1.75 mm thread with a depth of 28 mm for compatible mechanical connections. Appropriate drive settings are required to keep current within the motor’s continuous and short-duration operating limits.
