Product Description:

Bosch Rexroth Indramat manufactures the SF-A4.0125.030-14.000 servo motor, part of the SF Servo Motors series. This permanent-magnet servo motor is built to drive industrial axes that require precise velocity and position control under closed-loop feedback. Used with digital drives, the motor converts electrical command current into rotary motion for pick-and-place gantries, packaging spindles, and material handling equipment. It is suited to automated machines that need repeatable moves during frequent speed changes and short dwell periods. Its feedback system supports applications that must stop accurately and resume motion without drift.

The motor reaches a rated speed of 3000 rpm, allowing constant throughput on conveyor or spindle axes when driven by a matched inverter. During acceleration from standstill, a locked-rotor current of 10.6 A can flow, generating strong starting torque to overcome static friction and load inertia. Once in motion, the electromagnetic conversion follows a torque constant of 1.37 Nm/A, so each ampere of phase current produces predictable shaft torque for stable closed-loop control. Low rotor inertia of 0.003 kg·m² supports rapid speed changes and short indexing cycles. A single-turn absolute encoder with 8,000,000 increments per revolution provides very fine position feedback, and the 324 mm overall length leaves room for direct coupling on the smooth shaft.

Power-off holding is provided by a brake released with 24 V DC and rated for 18 Nm, which helps keep gravity-loaded axes from moving when supply power is removed. This arrangement is useful on vertical axes and transfer units that cannot be allowed to coast at standstill. Thermal monitoring uses 2 NTCs embedded in the windings, allowing the drive to reduce output if motor temperature rises toward its limit. The feedback device retains position to ±20 arcsec, so the axis can restart without a reference move after shutdown. With a total mass of 17.7 kg, the motor adds manageable load to linear modules, and the mounting face supports direct coupling to compatible gearboxes.