Product Description:

The SF-A4.0230.030-00.075 is a synchronous servo motor produced by Bosch Rexroth Indramat for the SF Servo Motors series. This motor is intended for closed-loop industrial axes that demand precise velocity and torque regulation, and its permanently excited design provides high power density while electronic commutation allows the drive to synchronize stator currents with rotor position in real time. Integrated into multi-axis systems, the unit converts electrical command signals into rotational motion for positioning, tracking, or process speed control tasks on automated machinery. That control method helps the motor maintain smooth rotation during indexing moves and changing process loads.

The windings operate from a DC bus rated at 670 V, allowing high back-EMF operation without step-down transformers. A sinusoidal e.m.f. waveform minimizes torque ripple, so velocity remains stable even at low speeds. Rotor position is monitored by an absolute value encoder, enabling immediate position awareness at power-up and eliminating homing cycles. Mechanical coupling uses an IEC interface with a flange diameter of 142 mm, which supports connection to compatible gearboxes or direct-drive loads. During startup or stall conditions, the stator can draw a locked-rotor current of 14 A, so the drive and protective devices must accommodate that demand.

Torque at standstill reaches 22 Nm, delivering breakaway force for static loads while the control loop settles. Under continuous duty, the rotor can sustain a rated speed of 3000 rpm, supporting fast cycle times on automated axes. Thermal monitoring is handled by two NTC thermistors embedded in the windings, and their resistance change allows the drive to reduce output or shut down before insulation limits are exceeded. With a torque constant of 1.57 Nm/A, the motor provides a predictable relationship between current and torque during closed-loop control. This helps the controller match commanded acceleration to available motor current without abrupt response changes.