SE-KB4.040.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.040.030-04.000 is part of the SE Synchronous Servo Motors series and offers a nominal speed of 3000 rpm with a maximum torque output of 8.8 Nm. It features a holding brake torque of 18 Nm and a brake supply voltage of 24 V. The motor has a standstill current of 5.4 A and a winding resistance of 5.89 Ohm.
Internal Product Review
The SE-KB4.040.030-04.000 is a Bosch Rexroth Indramat synchronous servo motor with 4.9 Nm static torque and 3000 rpm nominal speed. Max torque of 8.8 Nm and peak current of 32 A give the motor a strong dynamic profile for responsive axis control. Holding brake torque of 18 Nm with a 24 V ±10% brake supply is a particularly valuable combination for secure positioning performance.
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Product Description:
The SE-KB4.040.030-04.000 is a servo motor developed by Bosch Rexroth Indramat for the SE Synchronous Servo Motors series. Designed for automated machinery, the unit converts electrical commands from a drive into mechanical rotation that positions tooling, conveyor sections, or indexing tables with repeatable accuracy. Its integrated permanent-magnet rotor and tachogenerator feedback support closed-loop speed regulation, making the motor suitable for axis-control tasks that require rapid start-stop sequences and consistent cycle times.
At its rated operating point, the rotor turns at 3000 rpm, providing the nominal speed used by the drive during normal operation. At standstill, the shaft can deliver a static torque of 4.9 N·m with a standstill current of 5.4 A. The electromagnetic conversion factor is 0.91 N·m/A, providing a direct relationship between commanded current and developed torque. Current rise is governed by an electrical time constant of 7.0 ms and a phase inductance of 42.5 mH; these parameters influence control-loop bandwidth and current regulation. The coil resistance is 5.89 Ω, and the back-EMF constant is 106 V per 1000 rpm, affecting voltage demand as speed increases. The rotor and tachogenerator assembly have an inertia of 1.22 × 10⁻³ kg·m², and the drive typically accelerates the load from zero to nominal speed within a 50 ms ramp-up period.
For short transients, the motor withstands a peak current of 32 A and can generate up to 8.8 N·m of torque, providing additional capacity for acceleration or disturbance rejection. A spring-applied, electrically released holding brake supplies 18 N·m of holding torque to secure vertical or suspended axes when power is removed. The brake circuit operates at 24 V ±10%, draws 1.0 A, and adds 0.90 × 10⁻³ kg·m² of inertia. Once the brake is released, the motor’s moderate inertia supports a responsive mechanical time response and repeatable motion sequences. The drive can use the winding resistance and inductance when regulating current to help protect the motor winding from excessive thermal loading.
