SE-KB4.020.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.020.030-04.000 is part of the SE Synchronous Servo Motors series and features a nominal speed of 3000 rpm with a holding torque of 18 Newton meters. It has a flange diameter of 185 mm and peak current of 15 Amps. The servo motor offers a brake mass of 1.7 kilograms and a shaft size of 19 by 28 mm.
Internal Product Review
The SE-KB4.020.030-04.000 is a Bosch Rexroth Indramat synchronous servo motor with 2.0 Nm static torque and 3000 rpm nominal speed. An 18 Nm holding torque paired with 15 A peak current supports confident axis control during dynamic duty cycles. The 0.80 Nm/A torque constant gives efficient torque production, making the motor a strong fit for precision motion applications.
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Product Description:
The SE-KB4.020.030-04.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat and supplied within the SE Synchronous Servo Motors series. As a brushless AC unit, it converts drive current into precisely controlled torque for positioning tables, packaging axes, and other motion loops that require repeatable velocity and acceleration profiles in industrial automation. Electronic commutation eliminates brush wear and supports precise operation across repeated start-stop cycles.
The rotor can reach a nominal velocity of 3000 rpm under rated load, providing a reference speed for gearbox selection and cycle-time calculations. When the shaft is energized but stationary, it produces a static torque of 2.0 Nm, which is sufficient to hold light loads before motion starts. Short bursts up to a peak winding current of 15 A allow rapid acceleration, while the continuous standstill current is 2.5 A under thermally stable conditions. Each ampere of current produces torque according to an electromagnetic coupling factor of 0.80 Nm/A. The laminated stator stack has a winding inductance of 81.0 mH, which filters current ripple and affects the bandwidth of the drive’s control loop. Its winding resistance is 17.30 Ω, a value that controllers use to estimate copper losses and anticipate excessive heating.
The compact rotor assembly has an inertia of 0.74 × 10⁻³ kg·m², enabling fast reversals without imposing high regenerative energy on the inverter. Thermal saturation is delayed by a heating time constant of 11 min, so intermittent overloads can be applied for several minutes before the motor reaches a steady operating temperature. During continuous rotation, the back electromotive force rises at a rate of 85 V/1000 rpm; this voltage constant helps determine the DC-link level required to obtain full speed without flux weakening.
