SE-KB4.040.030-00.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.040.030-00.000 is part of the SE Synchronous Servo Motors series and has a mass of 9 kg with a maximum length of 220 mm. It delivers a nominal speed of 3000 rpm, maximum torque of 8.8 Nm, and a peak current of 32 A. The motor features a shaft size of 19 x 28 mm and a winding resistance of 5.89 Ohm.
Internal Product Review
The SE-KB4.040.030-00.000 is a Bosch Rexroth Indramat synchronous servo motor with 8.8 Nm max torque and 3000 rpm nominal speed. A 0.91 Nm/A torque constant and 7.8 ms electrical time constant support responsive, efficient axis performance. An excellent choice for motion systems that require strong dynamic behavior and dependable servo characteristics.
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Product Description:
The SE-KB4.040.030-00.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat for the SE Synchronous Servo Motors series. It functions as the drive element in industrial automation systems that require accurate rotational control, converting drive-generated current into repeatable mechanical motion. Typical applications include indexing tables, pick-and-place heads, and light conveyor sections where controlled acceleration and positioning are required.
This model reaches a nominal speed of 3000 rpm, supporting high-speed motion in automated machinery without requiring gearbox multiplication. A static shaft torque of 2.0 Nm is available at standstill for holding loads when motion is paused, while dynamic tasks can draw a peak winding current of 32 A during acceleration. The magnetic circuit produces torque in proportion to current, with a torque constant of 0.91 Nm/A, so a 10 A command produces approximately 9.1 Nm of torque. Current rise in the stator is governed by an electrical time constant of 7.8 ms, supporting rapid correction by the servo control loop. At zero speed, the motor draws a standstill current of 5.4 A. The 19 × 28 mm shaft is secured by an A6 × 6 × 20 mm feather key, providing positive engagement with pulleys or couplings, while the copper windings have a resistance of 5.89 Ω and an inductance of 42.5 mH for drive current regulator settings.
The motor supplies a maximum intermittent torque of 8.8 Nm for short overloads, providing additional torque for starting loads with high inertia. Rotor mass distribution results in a motor inertia of 1.22 × 10⁻³ kg·m², balancing responsive acceleration with stable velocity tracking. Thermal and structural loads are managed by a cast housing that weighs 9 kg and has a total length of 220 mm, allowing its mounting space to be planned accurately within the machine. The winding inductance filters switching ripple from modern IGBT inverters and contributes to smooth current regulation. A back-EMF constant of 106 V/1000 rpm supports operation with compatible 400 V class servo drives and allows generated voltage to be managed during deceleration.
