Product Description:

The SF-A3.0068.060-04.050 is a brushless servo motor manufactured by Bosch Rexroth Indramat as part of the SF Servo Motors series. In industrial automation, this motor functions as a rotary actuator that delivers commanded torque for positioning, indexing, and speed control on packaging, assembly, and material-handling equipment. By combining a permanent-magnet rotor with an electrically released holding brake, it provides dynamic motion during operation and supports static loads when power to the axis is removed. This arrangement is useful on axes that must stop accurately and remain in place between motion cycles.

The mounting interface uses a flange of 116 mm that aligns the housing with common machine patterns, while a 19 × 40 mm shaft transfers motion to the driven load. The motor can withstand an external axial force of 133 N without reducing bearing service life under normal operating conditions. The brake releases at 24 VDC, and the continuous phase coil current is 0.66 A while torque rises in proportion to the motor constant of 0.77 Nm/A. Under closed-loop regulation, the rotor reaches a rated speed of 6000 rpm and delivers a steady holding torque of 10.0 Nm. For startup and low-speed loading, it can produce 6.6 Nm of locked-rotor torque until shaft movement begins. The housing is sealed to IP 67, which helps keep out dust and water during use in demanding production areas.

During a blocked-shaft event, the drive must briefly supply a locked-rotor current of 8.5 A, so current limiting and thermal monitoring need to match the motor’s operating range. Once acceleration begins, the rotor’s polar moment of inertia of 11 × 10⁻⁴ kg·m² helps the axis respond smoothly to speed changes and reduces abrupt motion on medium-load applications. The motor has a mass of 9.6 kg, and the housing length of 294 mm keeps the package compact for multi-axis layouts with limited installation space. The compact envelope also helps when several axes are arranged close together on transfer systems or gantry carriages.