SE-KB4.065.030-04.000 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SE-KB4.065.030-04.000 is a synchronous servo motor from the SE Synchronous Servo Motors series, with a nominal speed of 3000 rpm and a maximum torque of 18.8 Nm. This motor features a peak current of 45 Amps and has a brake on time of 55 milliseconds. It weighs 11 kilograms without the brake and has a voltage constant of 114 V per 1000 rpm.
Internal Product Review
The SE-KB4.065.030-04.000 is a Bosch Rexroth Indramat synchronous servo motor rated for 18.8 Nm maximum torque and 3000 rpm nominal speed. Brake timing is well tuned for controlled stopping, with 50 ms brake-off time and 55 ms brake-on time. A 1.01 Nm/A torque constant supports efficient servo response, making this motor a strong choice for precise motion applications.
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Product Description:
The SE-KB4.065.030-04.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat for the SE Synchronous Servo Motors series. Designed for electronically coordinated motion, the unit converts commanded current into torque so that feed axes, conveyors, or rotary actuators can be positioned with millisecond accuracy within automated lines. Its electromagnetic construction supports dynamic cycles, while the optional brake secures the load when power is removed.
The drive section reaches a nominal mechanical velocity of 3000 rpm, which sets the base frequency relationship between the inverter and the motor poles. At that speed it can deliver up to 18.8 Nm of torque, while a static holding capability of 6.5 Nm protects a stopped axis from drift. Sudden load changes are supplied through a 45 A peak current margin, whereas continuous operation at standstill draws only 7.5 A. Each ampere contributes torque in line with a constant of 1.01 Nm/A, and the magnetic circuit responds to control-loop voltage through a stator inductance of 30 mH. Together with a 5.3 ms electrical time constant and a 3.39 Ω winding resistance, these values indicate current rise and servo bandwidth behavior.
A back-emf coefficient of 114 V/1000 rpm aligns the motor with standard 300 V class drives and assists regenerative braking during deceleration. The laminated rotor carries an inertia of 1.71 × 10⁻³ kg·m², balancing responsive acceleration with smooth speed regulation. When the integrated brake is fitted, its coil is energized from a 24 V DC ±10% source, releasing in 50 ms and engaging in 55 ms to secure vertical or safety-critical loads. The housing length without the brake measures 236 mm, and the assembly weighs 11 kg. These dimensions simplify installation in densely packed multi-axis machinery while maintaining thermal mass for stable operation.
