Product Description:

The SF-A5.0250.020-04.000 is a servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. It supplies closed-loop rotary power to positioning axes, conveyors, and other motion points where dynamic torque and precise speed control are required in industrial automation. Because it is used in closed-loop motion systems, the motor can support regulated shaft movement across repeated machine cycles. Its servo design helps the drive system respond to changing commands while maintaining stable motion under varying load conditions.

The electromagnetic holding brake is energized at 24 VDC and draws 1.33 A. It clamps the shaft with 56 Nm of static torque when power is removed, and its brake inertia is 30 × 10^-4 kg·m². This brake arrangement helps prevent unwanted shaft movement at standstill and supports controlled stopping on axes that must remain in position. Rated output speed is 2000 rpm, which is the operating speed used for standard machine cycles and steady servo operation. A torque constant of 2.3 Nm/A links output torque to phase current, making the current-to-torque relationship straightforward at the drive. Locked-rotor startup demands 10 A, and the motor uses an IM B5 flange arrangement with a 190 mm pilot diameter. The keyed shaft measures 32 × 58 mm, and the feather key is sized A10 × 8 × 50.

Position feedback is provided by a single-turn absolute encoder with a resolution of 8 million incr/rev. The encoder provides absolute position within one revolution, so the drive can read rotor angle immediately after startup. Each count is held within an accuracy window of ±20 arcsec, supporting repeatable position tracking and stable servo correction during reversing moves. During rapid reversals, the rotor’s mass moment of 83 × 10⁻⁴ kg·m² influences acceleration response and the load seen by the drive. When motion is blocked, the electromagnetic package can produce a stall output of 23 Nm for short-term holding without thermal damage. Accurate feedback and predictable rotor inertia help the motor work well with gearboxes, belt drives, and direct-coupled loads that require precise shaft positioning.