SE-KB4.020.030-14.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.020.030-14.000 is part of the SE Synchronous Servo Motors series. It offers a nominal speed of 3000 rpm, holding torque of 18 Nm, and a maximum torque of 4.7 Nm. The servo motor has a brake supply voltage of 24 V DC and a mass of 9 kg with brake.
Internal Product Review
The SE-KB4.020.030-14.000 is a synchronous servo motor rated for 3000 rpm with 4.7 Nm maximum torque. A 15 A peak current and 0.80 Nm/A torque constant support crisp acceleration and predictable torque production in motion applications. An 18 Nm holding torque adds strong axis retention, making the motor a well-balanced choice for precise servo duty.
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Product Description:
The SE-KB4.020.030-14.000 is a compact synchronous servo motor produced by Bosch Rexroth Indramat and supplied in the SE Synchronous Servo Motors series. It is intended for closed-loop positioning tasks in industrial automation where rapid speed changes and accurate torque delivery are required, such as pick-and-place axes or light mechanical handling modules. A built-in electromagnetic brake permits load retention during machine standby, and the flange and shaft geometry fit frame sizes commonly used with Rexroth drive controllers.
The holding brake uses a control line rated at 24 V DC, helping prevent unwanted motion under gravity or residual torque when the brake is applied. A short electrical time constant of 4.6 ms lets the winding current rise quickly, supporting tight torque loops. During power-off clamping, the brake delivers 18 Nm of resisting torque, which is higher than the motor’s continuous output and helps keep vertical loads stationary. For peak acceleration demands, the motor can generate up to 4.7 Nm, and the drive must handle a corresponding peak current of 15 A. Together with a torque constant of 0.80 Nm/A, this current-to-torque relationship sets the motor current scaling used by the drive. Winding resistance of 17.30 Ω and an inductance of 81.0 mH limit RMS current during continuous operation and help keep copper losses within the thermal class.
The rotor’s mechanical time constant is 19.0 ms, which is the time needed for speed to change from zero to nominal when rated voltage is suddenly applied. The coupled inertia of 0.74 ×10⁻³ kg·m² results in moderate load-matching requirements and helps the axis settle without excessive overshoot. With the brake installed, the assembly weighs 9 kg and has an overall length of 251 mm, which supports integration into compact enclosures. Rated speed reaches 3000 rpm, and the voltage constant of 85 V/1000 rpm is useful for back-EMF calculations during regenerative braking.
