Siemens 1FK7083-5AF71-1EB3 Servo Motor

The Siemens 1FK7083-5AF71-1EB3 is a synchronous servo motor from the SIMOTICS S-1FK7 generation, designed for high-performance motion control applications. This motor features permanent magnet excitation, making it suitable for use with SINAMICS drives in machine tools, packaging machines, robotics, and handling systems. It delivers high torque density, precise positioning, and low inertia for dynamic acceleration and deceleration.

Technical Specifications

The motor has a stall torque (M0) of 48 Nm and a stall current (I0) of 27.5 A at 60K overtemperature. Rated speed (nN) is 2000 rpm. Rated torque (MN) is 46 Nm and rated power (PN) is 9.6 kW. Moment of inertia (with brake) is 0.050 kg·m². Torque constant (kT) is 1.74 Nm/A. Voltage constant (kE) is 126 V/1000 rpm. Thermal class is F (155°C), with motor protection class IP65 (shaft and housing).

Built-in encoder: 22-bit absolute encoder (2048 ppr sine/cosine) with EnDat 2.2 interface, providing high-resolution position feedback for closed-loop control. The motor includes a holding brake (24V DC, 65 Nm holding torque) for vertical axes or safety stops. The motor has a keyed shaft with dimensions 28mm diameter and 60mm length, and a shaft end with M8 tapped hole. Cooling method is natural convection (self-cooling).

Key Features

• Synchronous permanent-magnet motor for SINAMICS drives

• Stall torque: 48 Nm; rated speed: 2000 rpm

• 22-bit absolute encoder with EnDat 2.2 (high precision)

• Integrated holding brake (24V DC, 65 Nm)

• IP65 protection (dust-tight, water jets)

• Keyed shaft, flange mounting with centering diameter 180mm

• Thermal class F, 155°C

• Connector system (rotatable) for power and encoder

• Low cogging torque for smooth operation at low speeds

Mechanical Construction

The 1FK7083-5AF71-1EB3 features a robust aluminum housing with integrated cooling fins. The flange size is 180mm (centering diameter). The motor length is 309mm (including shaft extension and connector). Weight is approximately 33 kg (with brake). The shaft is balanced according to DIN ISO 21940-11 with full key. Vibration level is grade A per IEC 60034-14. The motor is equipped with a rotatable connector (power and encoder) to facilitate installation in tight spaces. Bearings are designed for lifetime lubrication; no routine grease replacement required.

Electrical Interface

The motor connects to SINAMICS S120 or G120 drives via pre-assembled motor cables (power and encoder). The power connector (size 2) accepts up to 10 mm² conductors. The encoder connector (12-pin M23) carries the EnDat 2.2 signals. The holding brake requires separate 24V DC supply (0.75 A maximum). Motor winding resistance (U-V) is 0.27 Ω at 20°C. Inductance (U-V) is 3.6 mH. Motor leads are color-coded according to DIN EN 60204.

Applications

Typical deployments include main spindle drives on CNC mills, feed axes on machining centers, rotary tables, pallet changers, and high-dynamic packaging machinery. The high stall torque and low inertia allow rapid acceleration for pick-and-place operations. The IP65 rating enables use in wet environments such as food processing and machine tool coolant areas. The holding brake holds vertical axes safely when power is removed.

Environmental and Safety

Ambient temperature range: -20°C to +40°C (rated power), derating required up to +55°C. Storage temperature: -20°C to +60°C. Maximum altitude 1000 m without derating, up to 4000 m with derating. Sound pressure level less than 70 dB(A). The motor is certified CE, UL (recognized component), and RoHS compliant. Shaft grounding ring (option) prevents bearing currents when used with fast-switching drives.

Commissioning and Drive Compatibility

The motor is automatically recognized by SINAMICS drives when the motor nameplate data is entered or via electronic rating plate (when using DRIVE-CLiQ interface). Parameterization includes setting motor type, encoder type, current limits, and brake control. Siemens Starter or STARTER software provides guided commissioning. The 22-bit encoder ensures high precision at low speeds, making it suitable for direct drive applications.

Conclusion

The Siemens 1FK7083-5AF71-1EB3 servo motor offers a powerful, precise, and robust solution for demanding motion control systems. Its integration with SINAMICS drives, high-resolution encoder, and IP65 construction make it a reliable choice for industrial automation requiring dynamic torque and accurate positioning.