SE-KB4.090.030-14.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.090.030-14.000 is part of the SE Synchronous Servo Motors series and has a nominal speed of 3000 rpm with a maximum torque of 27.5 Nm. It features a holding brake torque of 18 Nm, a shaft size of 19 by 28 mm, and a flange diameter of 185 mm. The servo motor weighs 15 kilograms including the brake and has a peak current rating of 62 Amps.
Internal Product Review
The SE-KB4.090.030-14.000 is a Bosch Rexroth Indramat synchronous servo motor with 3000 rpm nominal speed and 27.5 Nm maximum torque. A 24 VDC holding brake rated at 18 Nm adds dependable axis retention and highlights the motor’s strong motion-control capability.
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Product Description:
The SE-KB4.090.030-14.000 is a synchronous servo motor produced by Bosch Rexroth Indramat for the SE Synchronous Servo Motors series. Intended for electrically coordinated axes, it transforms regulated drive current into precisely controlled rotary motion that moves tooling, indexers, or conveyor segments in automated machinery. Its electromagnetic design uses permanent magnets on the rotor and a three-phase stator winding, allowing direct connection to modern IndraDrive controllers and other digital amplifiers that require accurate feedback and repeatable torque generation.
At its nominal speed of 3000 rpm, the rotor supplies 9.0 Nm of continuous static torque for sustained duty cycles. A torque constant of 0.90 Nm/A lets the controller predict output torque from real-time phase current, simplifying closed-loop tuning. The motor has a voltage constant of 98 V/1000 rpm, allowing the inverter to maintain safe DC-bus limits during high-speed operation. Transient acceleration can draw up to 62 A through windings with a resistance of 1.90 Ω and an inductance of 17.1 mH, keeping the current slew within the drive ratings. Rotor inertia is 2.18 × 10⁻³ kg·m², balancing quick response with positional stability. The shaft measures 19 mm in diameter and 28 mm in length, and it is supplied without a keyway to accommodate custom couplings or clamp collars.
The motor withstands short overloads up to 27.5 Nm, providing reserve torque to overcome sudden load peaks. An integrated brake secures the shaft with 18 Nm of holding torque when de-energized and releases when a 24 VDC ±10% supply is applied. A flange with a diameter of 185 mm centers the housing on gearboxes or machine plates, while the total length with the brake remains 299 mm for compact installations. Despite the steel frame and brake assembly, the overall mass is 15 kg, which simplifies handling and limits moving-axis inertia.
