Siemens 1FK7022-5AK71-1HH0 Servo Motor – SIMOTICS S-1FK7

Siemens 1FK7022-5AK71-1HH0 — Compact Permanent-Magnet Synchronous Servo Motor for High-Dynamic Motion Control

The Siemens 1FK7022-5AK71-1HH0 is a size-2 frame permanent-magnet synchronous servo motor from the SIMOTICS S-1FK7 Compact series, purpose-built for motion control axes that demand rapid dynamic response within a constrained mechanical envelope. In the architecture of a closed-loop servo system, this motor occupies the position of the final actuator — the element that converts drive-side current commands into precise angular displacement. Its low rotor inertia, high pole-pair count, and absolute encoder interface collectively determine the bandwidth ceiling of the entire position loop. Selecting the wrong motor at this stage propagates error through every upstream control layer; selecting the 1FK7022-5AK71-1HH0 establishes a mechanically stable, electrically clean foundation for deterministic motion.

Within the SIMOTICS S-1FK7 product family, the compact segment (shaft heights 20–28 mm) addresses applications where torque-to-volume ratio is the primary constraint. The 1FK7022 designation identifies the 20 mm shaft-height variant — the smallest frame in the 1FK7 compact line — while the order code suffix 5AK71-1HH0 encodes the following configuration: rated speed 6,000 rpm, absolute multiturn encoder (EnDat 2.1 / DRIVE-CLiQ ready), natural convection cooling, IP64 sealing, plain shaft without key, and no integrated holding brake. This specific combination is widely specified in electronics assembly equipment, precision dispensing systems, and compact CNC sub-axes where the motor must fit inside a machine frame with less than 80 mm of axial clearance.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 1FK7022-5AK71-1HH0 is built around a concentrated-winding stator topology with a high pole-pair count relative to its frame size. This design choice directly reduces the electrical time constant (L/R ratio), which in turn allows the SINAMICS drive’s current controller to achieve a higher bandwidth — typically 1,000–2,000 Hz in the current loop — without inducing torque ripple from commutation harmonics. The consequence for the position loop is a measurable reduction in following error during high-acceleration transients.

The rotor assembly uses rare-earth neodymium-iron-boron (NdFeB) permanent magnets bonded to a laminated silicon-steel core. The lamination stack minimizes eddy-current losses at elevated speeds, maintaining thermal stability during continuous duty cycles. The magnet retention method — surface-mounted with a carbon-fiber sleeve on compact-frame variants — prevents magnet displacement under centrifugal loads at the 9,000 rpm maximum speed rating.

The integrated absolute multiturn encoder (EnDat 2.1 protocol) eliminates the need for a reference run (homing cycle) after power-up. The encoder communicates position data over the DRIVE-CLiQ serial interface at a cycle time of 125 µs, synchronized to the drive’s internal interpolation clock. This synchronization is architecturally significant: position feedback arrives at the drive’s speed controller within the same interpolation cycle in which the setpoint is computed, eliminating one full interpolation period of latency that would otherwise appear as phase lag in the velocity loop Bode plot.

From an EMC design perspective, the motor housing is a die-cast aluminum alloy with a continuous 360° shield termination at the cable entry point. The DRIVE-CLiQ single-cable solution routes both the power conductors and the encoder signal within a single shielded cable assembly, reducing the number of shield termination points in the cabinet and lowering the common-mode noise injection path into the encoder circuit. The motor’s stator winding is wound with a star (Y) configuration and the neutral point is internally isolated, which prevents zero-sequence currents from circulating through the machine frame ground — a common source of bearing current damage in PWM-driven servo systems.

The IP64 sealing is achieved through a labyrinth seal at the shaft exit combined with a static O-ring at the encoder cover interface. The labyrinth geometry creates a tortuous path that prevents particulate ingress without contact friction, preserving bearing life in dusty environments such as woodworking or metalworking machine tools.

System Integration Benefits

• Zero-homing absolute position feedback: The EnDat 2.1 multiturn encoder retains absolute position across 4,096 motor revolutions without battery backup, eliminating reference-run sequences on machine restart and reducing cycle time loss after E-stop events.
• Single-cable wiring architecture: DRIVE-CLiQ combines power and encoder signals in one cable run, reducing cabinet wiring labor by approximately 40% compared to separate power and resolver cable installations, and eliminating a class of wiring-error faults during commissioning.
• Plug-and-play drive identification: The motor’s electronic nameplate is stored in the encoder ASIC and transmitted to the SINAMICS drive at power-up via DRIVE-CLiQ. The drive auto-populates motor parameters (rated current, inertia, thermal model coefficients) without manual entry, reducing parameterization errors in multi-axis systems.
• Integrated thermal model with I²t monitoring: The SINAMICS drive runs a real-time thermal model of the motor winding using the motor’s resistance and thermal time constant data from the electronic nameplate. This provides overtemperature protection without a physical PTC thermistor, while also enabling the drive to issue a pre-warning alarm before the thermal limit is reached — allowing the machine controller to reduce duty cycle rather than trigger an emergency stop.
• Deterministic 125 µs feedback cycle: The DRIVE-CLiQ encoder update rate of 125 µs is phase-locked to the drive’s PWM carrier, ensuring that position data age is bounded and consistent. This determinism is a prerequisite for multi-axis electronic gearing and cam synchronization applications where phase error between axes must remain below 0.01°.
• Scalable within the 1FK7 family: The 1FK7022 shares the same flange interface pattern and cable connector pinout with the 1FK7032 and 1FK7040 compact variants. A machine design validated on the 1FK7022 can be scaled to higher torque by substituting a larger frame motor without redesigning the motor mount or cable harness.
• Diagnostic transparency via SINAMICS drive: The drive continuously monitors encoder signal quality (signal amplitude, track error, CRC fault rate) and reports degradation via PROFINET/PROFIBUS diagnostic telegrams before a hard encoder fault occurs. This enables predictive maintenance scheduling rather than reactive replacement.
• Compliance with IEC 61800-5-1 functional safety prerequisites: When paired with a SINAMICS S120 Safety Integrated module, the 1FK7022-5AK71-1HH0 participates in STO (Safe Torque Off) and SS1 (Safe Stop 1) safety functions certified to SIL 2 / PLd, satisfying machinery directive requirements without external safety relays on the motor circuit.

Quality Assurance & Global Logistics

Every Siemens 1FK7022-5AK71-1HH0 unit dispatched from our Xiamen, China facility undergoes a structured incoming inspection protocol before it enters available stock. Physical inspection covers shaft runout, encoder connector pin integrity, housing surface condition, and nameplate legibility. Serial numbers are logged and cross-referenced against procurement documentation to establish traceability. Units sourced through authorized distribution channels are accompanied by original Siemens packaging and, where available, factory test certificates.

Packaging for international shipment uses a three-layer system: the motor is wrapped in anti-static polyethylene foam, sealed in a moisture-barrier bag with desiccant, and placed in a double-wall corrugated export carton rated for 50 kg drop test per ISTA 2A. For air freight shipments, the carton is additionally secured with polyester strapping. Each shipment includes a commercial invoice, packing list, and datasheet. Export classification is handled under HS Code 8501.52 (AC motors, multi-phase, rated output exceeding 750 W — verify with your customs broker for destination-specific classification).

Logistics routes from Xiamen serve major industrial hubs with the following typical transit times: Southeast Asia 3–5 business days (air), Europe 5–8 business days (air express), North America 5–7 business days (air express), Middle East 4–6 business days (air). Sea freight consolidation is available for bulk orders exceeding 50 kg gross weight. All shipments are tracked end-to-end with AWB or bill of lading numbers provided within 24 hours of dispatch.

A 12-month warranty covers manufacturing defects under normal operating conditions as defined in Siemens technical documentation. Warranty claims are processed with photographic evidence and a fault description; replacement or credit is issued within 10 business days of claim approval. The warranty period begins on the shipment date recorded in our logistics system.

Contact Information

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