SE-KB4.040.030-14.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.040.030-14.000 is part of the SE Synchronous Servo Motors series and has a nominal speed of 3000 rpm with a maximum torque of 8.8 Nm. This servo motor has a mass of 11 kg and features a shaft style without keyway or feather key, measuring 19 mm by 28 mm. It operates with a brake holding torque of 18 Nm and a brake nominal current of 1.0 A at 24 V DC.
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Product Description:
The SE-KB4.040.030-14.000 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SE Synchronous Servo Motors series. Designed for closed-loop drive systems, the unit converts regulated electrical input from a servo amplifier into precise rotational movement for pick-and-place axes, packaging machinery, and similar automation roles. Its integrated permanent-magnet rotor and electromagnetic holding brake allow position retention when power is removed, simplifying vertical or suspended load applications that require secure stopping.
During continuous operation, the motor runs at a rated speed of 3000 rpm, a velocity that matches many 50/60 Hz drive modules without mechanical gearing. At standstill, it can deliver 4.9 Nm of static torque, enough to support moderate loads while maintaining positional accuracy. Electromagnetic conversion efficiency is reflected by its torque constant of 0.91 Nm/A, so each ampere of phase current generates just under one newton-meter. The stator’s electrical dynamics are shaped by a winding inductance of 42.5 mH and a phase resistance of 5.89 Ω, values that affect current rise time and copper losses inside the drive controller. A spring-applied brake supplies 18 Nm of holding torque, operates from a 24 V DC source with a tolerance of ±10%, and draws 1.0 A when released. A plain shaft measuring 19 mm by 28 mm is supplied without a keyway, supporting clamp or compression couplings where backlash must be minimized.
For dynamic moves, the rotor can reach a maximum torque of 8.8 Nm when the drive supplies up to 32 A of peak phase current, allowing fast acceleration of moderate inertial loads. The aluminum housing encloses a rotor inertia of 1.22 × 10⁻³ kg·m², so rapid reversals can be executed without excessive drive gain. Despite these capabilities, the motor weighs only 11 kg and measures 267 mm in overall length, which simplifies mounting on compact machinery. A back-EMF constant of 106 V per 1000 rpm helps the drive estimate speed accurately during field-oriented control.
