Product Description:

Bosch Rexroth Indramat manufactures the SF-A3.0068.060-14.050 in its SF Servo Motors series. The motor serves as a precision drive element that converts controlled electrical input into rotational motion for indexing tables, pick-and-place heads, and light machining axes. By integrating this servo into a closed-loop system, machine builders obtain repeatable positioning and quick acceleration without mechanical gear reduction, which simplifies layout and reduces backlash. Direct coupling can also improve positioning consistency because there is no gearbox compliance between the rotor and the driven mechanism. This is useful on light axes where short settling time matters after each move.

The motor has a rated speed of 6000 rpm, allowing high cycle counts in short time windows. A torque constant of 0.77 Nm/A links commanded current to developed torque, giving the controller predictable gain settings. During startup, the stator may draw a locked-rotor current of 8.5 A while resisting the load with a locked-rotor torque of 6.6 Nm; these values affect inverter sizing and fuse selection. The integrated holding brake is energized by 24 VDC, and its coil requires only 0.66 A, which helps limit power dissipation inside the cabinet. These electrical values also set the current demand and heat produced during hard acceleration.

The motor uses IM B5 flange mounting, which anchors the housing concentrically on the machine face. The motor cable uses 4 × 1.5 mm² conductors to carry phase current with minimal voltage drop, and a separate brake lead of 2 × 1.5 mm² connects the coil. The brake adds 10.0 Nm of static holding torque, a 0.6 kg mass, and an inertia of 1.06 × 10⁻⁴ kg·m² to the rotor system. When rapid stops are required, the drive can dump up to 785 Ws of energy into a 3.3 Ω plug resistor, preventing overvoltage on the DC bus and helping the axis meet emergency braking times without mechanical wear. That resistor path helps absorb regenerated energy during deceleration so the DC bus remains stable.