Product Description:

The SF-A4.0125.015-14.057 is a three-phase servo motor built by Bosch Rexroth Indramat for the SF Servo Motors series. As an electromechanical actuator, it converts drive current into controllable shaft torque so machine tools, pick-and-place gantries, and packaging stations can execute precise motion profiles. The motor uses the IM B5 construction form, which makes it suitable for flange mounting into geared assemblies or directly onto load shafts within an automated cell. Its layout also suits applications that require repeatable acceleration, controlled stopping, and compact flange installation.

The motor’s braking assembly provides 18 Nm of holding torque, so the shaft stays immobile when power is removed. This holding force comes from a permanent-magnet fail-safe brake whose armature adds only 3.1 × 10⁻⁴ kg·m² of inertia and 1.04 kg of mass to the rotor. The brake is energized from a control supply of 24 VDC ±10% with 5% ripple and draws only 0.7 A during release, easing the load on auxiliary power supplies. During driven operation, the electromagnetic section of the motor produces torque in proportion to current, and a torque constant of 2.8 Nm/A allows the drive to calculate command current for a given load requirement. Under continuous duty, the shaft can maintain a rated mechanical speed of 1500 rpm, which matches common reducer ratios found in indexing tables and feed rolls. Because the brake releases electrically, the motor can hold a vertical or suspended load at standstill without relying on drive torque alone.

A locked-rotor torque of 14.5 Nm supports short-term starting conditions and helps the motor overcome static load friction at power-up without mechanical preload devices. Reaching this stall level requires a locked-rotor current of 5.2 A, a value the drive must accommodate for several electrical cycles. The associated inverter connects to a DC link potential of 670 VDC, allowing high dynamic response while keeping conductor cross-sections moderate. For mobile or vibration-exposed equipment, the assembly withstands mechanical shocks up to 6 g, so brake and rotor alignment remain intact during transport and service. This level of shock resistance is useful where the motor is mounted on transfer units, moving carriages, or equipment exposed to handling impacts.