Product Description:

The SE-LB3.055.030-04.000 is a synchronous servo motor engineered by Bosch Rexroth Indramat for the SE Synchronous Servo Motors series. It is designed for positioning and velocity control in automated machinery, where it converts drive commands into controlled rotary motion. Its integrated holding brake secures the shaft when power is removed, while the compact frame accommodates machine axes with limited installation space.

This motor reaches a nominal speed of 3000 rpm, providing a reference for drive settings and gearbox selection. During acceleration or short load spikes, it can deliver up to 15 Nm of torque, while its standstill torque of 6.8 Nm sustains stationary loads. The peak current is 40 A, while continuous operation at standstill draws 6.7 A, so the selected drive must accommodate both operating conditions. With a torque constant of 1.02 Nm/A, the motor produces approximately one newton-meter of torque for each ampere supplied by the inverter. A winding inductance of 30 mH slows the rate of current change and helps reduce the effect of drive pulses. The 24 V DC brake circuit locks the shaft when motion is not commanded. The motor has a 19 × 40 mm shaft, an A6 × 6 × 32 feather key, a 95 j6 pilot diameter, and an overall length of 295 mm including the brake.

Rapid operating cycles benefit from a ramp-up time of 27 ms, enabling the motor to start quickly in applications with frequent acceleration. The motor, including its brake, weighs 11.3 kg, which is suitable for gantry or robotic joints with payload restrictions. Its back EMF has a voltage constant of 113 V/1000 rpm, which indicates the inverter voltage required as motor speed increases. Electrical and thermal losses are influenced by a phase resistance of 3.53 ohms, making resistance an important consideration when selecting operating current and cooling provisions. The holding brake supports stationary load retention, while the motor windings provide the torque needed for controlled acceleration and speed regulation.