Siemens 1FK7086-7AF71-1DG3-Z Servo Motor – SIMOTICS S-1FK7

Siemens 1FK7086-7AF71-1DG3-Z — Permanent-Magnet Synchronous Servo Motor for High-Precision Motion Axes

The 1FK7086-7AF71-1DG3-Z belongs to the SIMOTICS S-1FK7 Compact series, a family of permanent-magnet synchronous motors (PMSM) purpose-built for closed-loop servo axes in machine tools, robotics, and process automation. Within the SINAMICS S120 and S210 drive ecosystems, this motor functions as the torque-generating actuator at the terminal node of a cascaded position-speed-current control loop. Its role is to convert the drive’s PWM voltage output into precise angular displacement with deterministic torque response — a function that demands tight electromagnetic design tolerances, low cogging torque, and a high-resolution absolute feedback path.

The frame designation “086” indicates a stator outer diameter of 86 mm, placing this unit in the mid-range of the 1FK7 Compact lineup. The rated speed code “AF7” corresponds to 2,000 rpm, and the torque class at this frame size delivers approximately 27 Nm continuous shaft torque with a 3× overload peak of ~81 Nm — sufficient for aggressive acceleration profiles in indexing tables, gantry axes, and articulated robot joints. The “1DG3” encoder suffix identifies a DRIVE-CLiQ-compatible absolute encoder (single-turn or multi-turn depending on Z-option), which transmits position, temperature, and motor identification data over a single standardized digital cable to the SINAMICS drive module.

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Technical Parameters

Hardware Logical Analysis

The 1FK7086-7AF71-1DG3-Z is engineered around a concentrated-winding stator topology that achieves a higher slot-fill factor compared to distributed-winding designs, directly translating into a lower winding resistance per unit torque. This reduces copper losses at rated operating points and allows the motor to sustain higher continuous torque within the same thermal envelope. The rotor uses surface-mounted NdFeB magnets arranged in a low-pole-count configuration optimized for the 2,000 rpm speed range, balancing back-EMF linearity against iron loss at elevated frequencies.

The DRIVE-CLiQ encoder interface (1DG3) is a critical architectural element. Unlike legacy resolver or incremental TTL encoder interfaces, DRIVE-CLiQ is a proprietary Siemens digital protocol operating over a standardized RJ45-style connector. The encoder ASIC embedded in the motor transmits absolute position data, motor nameplate parameters (rated current, pole pairs, thermal model coefficients), and real-time winding temperature via a single cable. This eliminates the separate encoder cable and motor data module (MOM) required in older 1FT6/1FK6 generations, reducing wiring harness complexity and the probability of connector-induced signal faults in high-vibration environments.

EMC performance is addressed at the motor terminal box level through integrated common-mode choke geometry in the power lead entry, combined with the drive-side output reactor or sine-wave filter recommended in the SINAMICS S120 system manual. The motor housing is manufactured from die-cast aluminum alloy with a conductive surface treatment, providing a low-impedance ground path for shield termination of the power cable. This architecture suppresses conducted emissions on the DC bus and limits radiated interference to levels compliant with EN 61800-3 Category C2 without additional external filtering in most installations.

The Z-suffix in the part number denotes a factory-configured special option applied at the Siemens manufacturing stage. Common Z-options for this frame include an integrated holding brake (for vertical axes requiring position retention at zero speed), a reinforced shaft seal for IP65 or IP67 protection, or a modified winding configuration for non-standard supply voltages. The Z-option is encoded in the motor’s DRIVE-CLiQ electronic nameplate, ensuring the SINAMICS drive automatically loads the correct motor model parameters during commissioning without manual data entry.

System Integration Benefits

• Zero-parameter commissioning via DRIVE-CLiQ electronic nameplate: The motor transmits its full electrical model — rated current, pole pairs, stator resistance, inductance, and thermal time constants — to the SINAMICS drive at power-up. The drive auto-configures the current controller gains without manual entry, reducing commissioning time from hours to minutes on a new axis.
• Absolute position retention across power cycles: The 1DG3 multi-turn absolute encoder stores rotor position through power-off events using an internal capacitor-backed counter. On restart, the axis is immediately referenced without executing a homing sequence, eliminating the 15–90 second reference-run delay common with incremental encoder systems.
• Integrated thermal model for predictive derating: The motor’s winding temperature sensor (KTY84 or PT1000 depending on Z-option) feeds real-time thermal data to the SINAMICS drive’s I²t model. The drive proactively reduces current limits before the motor reaches thermal shutdown, preventing unplanned stops on production lines.
• High overload torque for dynamic acceleration: The 3× peak torque ratio (81 Nm peak vs. 27 Nm continuous) allows the axis to execute short-duration acceleration bursts without exceeding the drive’s current limit, supporting cycle times below 500 ms on indexing and pick-and-place applications.
• Deterministic velocity loop bandwidth: The high encoder resolution (20-bit single-turn) combined with the SINAMICS S120’s 125 µs current controller cycle time enables velocity loop bandwidths exceeding 400 Hz, supporting stiff position control on axes with low mechanical compliance.
• Seamless TIA Portal integration: The motor is fully described in the Siemens SIZER and TIA Portal drive libraries. Engineers can import the motor object directly into a SINAMICS S120 drive project, with automatic calculation of matching motor module current ratings and cable cross-sections.
• Reduced cable inventory: DRIVE-CLiQ uses a single standardized cable type (6FX2002-2DB20 series) for all 1FK7 motors regardless of encoder variant, simplifying spare-parts management in multi-axis machine installations.
• Compatibility with Safety Integrated functions: When paired with a SINAMICS S120 drive equipped with Safety Integrated (SI) firmware, the 1FK7086-7AF71-1DG3-Z supports STO (Safe Torque Off), SS1 (Safe Stop 1), and SLS (Safely Limited Speed) without external safety relays, enabling IEC 62061 SIL 2 / ISO 13849 PLd machine safety architectures.

Quality Assurance & Global Logistics

Every unit of the 1FK7086-7AF71-1DG3-Z supplied through siemensplc.com is sourced from verified supply channels with full traceability to Siemens AG manufacturing records. Pre-shipment inspection covers physical label verification against the DRIVE-CLiQ electronic nameplate data, packaging integrity assessment, and connector pin continuity check on the encoder interface. Serial numbers are cross-referenced against available Siemens product databases prior to dispatch.

Shipments originate from our warehouse in Xiamen, China — a major logistics hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard in-stock orders are processed within 1–2 business days. DHL Express transit times to Western Europe average 3–5 business days; to North America, 4–6 business days; to Southeast Asia, 2–3 business days. Sea freight consolidation is available for multi-unit orders where air freight cost is a constraint. All shipments include commercial invoice, packing list, and certificate of conformity. Export classification and HS code documentation are prepared in compliance with Chinese customs regulations and destination-country import requirements.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed via email with photographic evidence and the unit’s serial number. Replacement or credit is issued within 10 business days of claim verification.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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