Product Description:

The SF-B4.0125.060-00.000 is a permanent-magnet synchronous servo motor manufactured by Bosch Rexroth Indramat within the SF Servo Motors series. In automated machinery, it converts controlled DC bus energy into regulated mechanical torque, allowing precise rotary positioning and stable velocity profiles for axes such as packaging spindles, pick-and-place heads, or conveyor drives. The unit integrates an absolute feedback device so drive controllers can read position immediately after power-up.

During continuous operation, the motor reaches a rated speed of 6000 rpm, which is the upper operating speed before field weakening is required. At standstill, it can hold loads with 12.5 Nm of electromagnetic torque while drawing a phase current of 19 A. The motor has a torque constant of 0.71 Nm/A, which relates commanded current to torque output. Position feedback is generated by a single-turn absolute STG encoder with 8 M incr/rev, supporting very fine position resolution. Two integrated NTC sensors report winding temperature to the controller for overload protection, and the IM B5 flange mounting format with a 277 mm housing supports direct attachment to gearboxes or machine plates.

The servo draws its power from a DC link maintained at 670 V, matching the voltage range of compatible drive modules. Environmental sealing is classified as IP67, excluding the A-flange, which supports washdown operation when the shaft is properly guarded. Positional fidelity is aided by an encoder accuracy of ±20 arcsec, which helps keep motion error very low during repeated positioning cycles. The rotating assembly has a moment of inertia of 30 × 10⁻⁴ kg·m², balancing quick acceleration with mechanical stability. A keyway and feather key output shaft simplifies coupling to pulleys or couplings, and the 16 kg mass keeps handling practical during installation.