SE-LB3.033.030-04.044 Bosch Rexroth Indramat
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The SE-LB3.033.030-04.044 is a synchronous servo motor from the SE Synchronous Servo Motors series by Bosch Rexroth Indramat. This motor features a nominal speed of 3000 rpm, maximum torque of 9.1 Nm, and holding brake torque of 8.0 Nm. It also has a shaft diameter of 19 mm and a standstill current of 4.0 A.
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Product Description:
The SE-LB3.033.030-04.044 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SE Synchronous Servo Motors series. As a rotary actuator, it converts controlled electrical energy into precise shaft motion for positioning, feed, or spindle axes in automated machinery. The motor integrates a permanent-magnet rotor, an electromagnetic stator winding, and a built-in holding brake that secures the load when power is removed. Its mechanical interface is a keyed steel shaft that is ready for couplings or timing pulleys, making it suitable for direct connection to common power-transmission components.
During continuous operation, the motor runs at a nominal speed of 3000 rpm while delivering a static torque of 4.2 Nm. For short load peaks, the magnetic stack can reach 9.1 Nm without overheating. The torque constant is 1.02 Nm/A, so each ampere of current produces about one newton-meter of torque. The drive must supply a standstill current of 4.0 A to hold position at zero speed. Current rise is limited by an electrical time constant of 7.6 ms, which supports responsive command changes during acceleration and deceleration. The copper coils have a resistance of 7.9 Ω and an inductance of 60 mH, and these electrical values influence current response and servo tuning.
Dynamic behavior is further described by a mechanical time constant of 5.8 ms, indicating how quickly the shaft approaches target speed after torque is applied. The rotor contributes an inertia of 0.81 ×10⁻³ kg·m², while the integrated brake adds only 0.12 ×10⁻³ kg·m², helping the axis reverse direction with limited overshoot. When power is removed, the spring-applied brake clamps the shaft with 8.0 Nm of torque and is released by a brake current of 0.8 A. Generated back EMF follows a voltage constant of 112 V per 1000 rpm, giving the drive predictable electrical behavior during closed-loop control. The shaft diameter is 19 mm and it projects 40 mm beyond the front bearing, providing space for couplings or gearheads while keeping the motor package compact.
