Product Description:

The SF-B4.0091.060-10.000 is a brushless AC servo motor from Bosch Rexroth Indramat in the SF Servo Motors series. In automated equipment, it converts electrical drive commands into rotary motion for positioning tables, feeders, and pick-and-place axes that require repeatable movement. Its feedback hardware provides absolute position information to the drive controller so closed-loop control can maintain very fine positioning during rapid acceleration and deceleration cycles. The motor uses IM B5 construction, which allows flange mounting to a machine wall while the housing remains stationary.

The STG encoder supplies 8,000,000 increments per revolution, allowing the controller to resolve motion down to ±20 angular seconds. This feedback works with a maximum speed of 6000 rpm, which supports fast traverse motion without reducing feedback quality. The electromagnetic circuit produces torque in proportion to current at 0.65 Nm/A, giving the drive a linear torque constant for current-based control. With the shaft locked, the motor can deliver 9.1 Nm while drawing 14 A, which indicates the allowable stall operating point. Two integrated NTC sensors monitor winding temperature so the drive can reduce load before excessive heat builds up.

The motor has a 142 mm flange that centers the stator on the machine frame, and the smooth shaft measures 24 mm in diameter by 50 mm in length for use with backlash-free clamping hubs. Its total length is 246 mm, and the complete assembly weighs 13 kg, which helps balance compact installation with stable mechanical damping. Rotor inertia is 21 × 10⁻⁴ kg·m², supporting quick starts and stops without requiring excessive drive current. Power is supplied through a 4 x 2.5 mm² cable, and the dual NTC sensors share that connection so thermal status is transmitted along with the phase conductors.