42.SM.201-44BJ KEB
Wake Industrial LLC is not an authorized distributor of this product.
The KEB 42.SM.201-44BJ is a synchronous-servo motor from the SM Synchronous Servo Motors series, featuring a three-phase asynchronous design and self-cooling. It operates at a speed of 4000 rpm with a stall torque of 5.3 Nm and a holding torque of 9 Nm. The motor has IP54 protection, a B5 IFT5 compatible flange, and weighs 5.7 kg without the brake.
Internal Product Review
The 42.SM.201-44BJ is a KEB synchronous-servo motor well suited for disciplined motion applications, with self-cooling and IP54 protection. A 5.3 Nm stall torque paired with 4000 rpm supports crisp servo response and strong throughput in dynamic machine axes. The integrated brake with 9 Nm holding torque adds valuable axis retention for vertical or indexing applications.
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Product Description:
The 42.SM.201-44BJ is manufactured by KEB as part of the SM Synchronous Servo Motors series. It is a synchronous servo motor intended to deliver accurate velocity and position control in packaging machines, material-handling axes, and other automation systems that rely on closed-loop drives. KEB uses a long-frame, three-phase design and equips the motor with a shaft that carries a feather key, allowing direct coupling to pulleys or gearboxes without additional adapters. This shaft arrangement provides positive torque transfer during repeated acceleration and deceleration cycles.
The unit uses self-cooling, so heat is removed by surface convection and no external fan is required. The rated rotor speed reaches 4000 rpm, providing a broad operating range for indexing or continuous-duty motion. The motor provides a continuous stall torque of 5.3 Nm while the shaft is stationary. A nominal DC bus of 330 V, matched to 400 V class inverters, supplies power for motor operation, and the windings can also operate from a 560 V DC link when required. The rotor has a moment of inertia of 3.13 kg·cm², supporting rapid acceleration while helping limit overshoot in high-gain servo loops. Its cooling method also reduces the number of auxiliary components required around the motor housing.
An integrated holding brake develops 9 Nm of torque to secure vertical or suspended loads whenever power is removed. The motor frame weighs 5.7 kg without the brake, allowing installation on relatively light machine structures. The enclosure has an ingress protection rating of IP54, guarding internal parts against harmful dust deposits and splashing water in typical industrial settings. A B5 flange compatible with IFT5 provides standardized face dimensions for mounting the motor to supported equipment. The size-42 stator package keeps the overall length moderate while providing sufficient winding space for the stated torque output. Its flange and keyed shaft support rigid alignment with compatible pulleys, couplings, and gearboxes.
