SM 56-S-4000-G KEB
Wake Industrial LLC is not an authorized distributor of this product.
The KEB SM 56-S-4000-G is a synchronous servo motor from the SM Synchronous Servo Motors series with a rated torque of 3.2 Nm and a rated speed of 4000 revolutions per minute. It features a Sin/Cos encoder EPH 39, operates at a rated voltage of 240 V, and has an IP65 ingress protection rating. The motor has a peak current of 49.5 A and is designed without a brake.
Internal Product Review
The SM 56-S-4000-G is a KEB synchronous servo motor with 3.2 Nm rated torque and 4000 min⁻¹ rated speed. IP65 ingress protection and a Sin / Cos encoder EPH 39 support dependable feedback and clean integration in demanding motion systems. A 49.5 A peak current gives this motor strong dynamic capability for high-response servo applications.
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Product Description:
The SM 56-S-4000-G is a synchronous servo motor produced by KEB within the SM Synchronous Servo Motors series. Designed for industrial automation, the unit converts electrical commands from a servo drive into controlled mechanical rotation for indexing tables, feeders, and small gantry axes. Its closed-loop operation supports precise velocity and position control in packaging equipment, electronics assembly systems, and other motion-focused machinery. The compact motor is suited to applications that require responsive movement and consistent positioning during repetitive production cycles.
During continuous operation, the motor runs at a rated speed of 4000 rpm and delivers a nominal shaft torque of 3.2 Nm. The stator draws a rated current of 9.0 A, while the drive supplies a line-to-line voltage of 240 V. During rapid acceleration, the current can rise to 49.5 A, allowing the axis to overcome friction and inertial loads without stalling. These electrical values determine the heat that the laminated stator and housing must dissipate during operation. They also support the selection of compatible drive protection, motor cables, and cabinet ventilation for the installation.
At zero speed, the winding can produce a holding torque of 3.8 Nm when a standstill current of 10.2 A is applied, providing static retention for indexing shafts. The torque constant is 0.39 Nm/A, linking commanded phase current to shaft torque, while the back EMF rises by 40.6 V per 1000 rpm for operation with typical 300 V DC links. A distributed inductance of 7.6 mH helps filter high-frequency pulse-width modulation edges, and a copper resistance of 1.21 ohms contributes to resistive heating under load. The rotor has a mass moment of inertia of 5.7 kg·cm², supporting quick speed changes without excessive overshoot. The motor also has an oil-tight flange with IP65 protection and is supplied without a brake. Shaft position feedback is provided by a Sin/Cos EPH 39 encoder, which supplies the drive with the signals required for closed-loop motion control.
