C3.SM.000-3400 KEB
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The KEB C3.SM.000-3400 is part of the SM Synchronous Servo Motors series and features a rated speed of 3000 rpm with a rated torque of 3.9 Nm. This servo motor has a rated voltage of 400 V, a max current of 14.5 A, and weighs 5.2 kg. Its shaft diameter measures 14 mm and the rotor inertia is 4.2 kgcm2.
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Product Description:
The C3.SM.000-3400 is a three-phase synchronous servo motor manufactured by KEB and supplied as part of the SM Synchronous Servo Motors series. Designed for closed-loop drive systems, the unit converts commanded currents from a matched inverter into controlled shaft torque and velocity, enabling precise positioning and speed regulation in automated packaging, material-handling, and small machining stations. Its operating profile suits applications that require repeatable motion, stable speed control, and accurate response to changing load conditions.
During continuous operation, the motor delivers a rated shaft output of 3.9 Nm at a base speed of 3000 rpm, obtained when the drive applies the nominal line-to-line supply of 400 V. These steady-state values correspond to a phase draw of 2.7 A during normal running conditions. For short duty bursts, the machine can withstand a peak demand of 20.3 Nm and currents up to 14.5 A, providing extra acceleration torque for indexing movements. Under no-load conditions, the rotor reaches 3950 rpm, showing available speed headroom before field weakening. A stall torque of 4.5 Nm and a stall current of 2.9 A describe the magnetic loading when the shaft is locked, figures used by control algorithms to limit overheating.
The dynamic behavior is supported by a voltage constant of 118 V/1000 rpm, which affects back-EMF generation and the drive PWM range. Mechanical response is influenced by a rotor inertia of 4.2 kgcm², and this moderate mass allows quick reversals while still smoothing load disturbances. The stator winding inductance of 20.6 mH and winding resistance of 5.9 Ω shape current rise time and copper losses, which the inverter must compensate for during high-frequency commutation. A lateral force capacity of 400 N at rated speed protects the bearings from belt or pinion side loads, and the 14 mm keyed shaft simplifies direct coupling to gear stages. The final installation weight is 5.2 kg, which supports mounting on compact axes or in multi-motor assemblies.
