Product Description:

The SF-B4.0172.060-14.050 is a synchronous servo motor produced by Bosch Rexroth Indramat within the SF Servo Motors series. As a rotary actuator, it converts commanded electrical energy into precise shaft motion, allowing CNC, packaging, or assembly stations to position loads quickly and repeatably. The motor interfaces with compatible digital drives through a single-cable feedback architecture and supplies closed-loop position data through an integrated absolute encoder. This arrangement supports accurate motion control while keeping the motor connection compact.

During continuous operation, the motor reaches a rated speed of 6000 rpm, which is suitable for high-throughput axes. The torque constant is 0.65 Nm/A, so each ampere of drive current yields 0.65 newton-meters of torque. Dynamic response is aided by the rotor inertia of 40 × 10⁻⁴ kg·m², which helps limit overshoot during rapid command changes. The windings draw power from a drive whose DC link sits at 670 VDC, helping maintain short current rise times. Power, brake, and encoder lines exit the housing through a size 1.5 circular connector, while the recommended motor cable uses 4 x 6.0 mm² conductors and the brake conductors are 2 × 1.5 mm². An absolute encoder provides single-turn position feedback without homing, and a locked-rotor torque of 17 Nm helps the shaft withstand stall loads.

The holding system uses a permanent-magnet brake that produces 18 Nm of static torque, helping keep the shaft stationary during power loss. To energize the coil, the drive supplies 0.7 A, and the brake releases when it receives 24 VDC from the control line. Initial acceleration imposes a peak demand of 26 A on the power stage, so the drive and protective devices must be sized for that short-term load. These electrical values are useful when matching the motor with a compatible inverter for cyclic operation. The brake is intended for holding at standstill, while motion control is handled by the drive during normal operation.