Siemens 1PH8081-1SU02-3NA1-Z Servo Motor – SIMOTICS M-1PH8

Siemens 1PH8081-1SU02-3NA1-Z — SH80 Synchronous Servo Motor with Absolute Encoder in the SIMOTICS M-1PH8 Series

The Siemens 1PH8081-1SU02-3NA1-Z is a compact synchronous servo motor belonging to the SIMOTICS M-1PH8 product family, designed for closed-loop motion control applications where torque density, thermal stability, and encoder fidelity are non-negotiable. Operating within the SH 80 frame class, this motor is engineered to deliver consistent dynamic response across continuous-duty production cycles, making it a standard selection for machine tool feed axes, packaging lines, and multi-axis gantry systems integrated with SINAMICS S120 drive platforms.

The part number structure encodes precise hardware configuration: 1PH8 identifies the SIMOTICS M synchronous motor family; 081 denotes the SH 80 frame with a 1-stack active length; 1S specifies the standard shaft and flange geometry; U indicates forced-air ventilation via an integrated fan unit; 02 defines the terminal box position; 3NA1 selects the absolute multiturn encoder with DRIVE-CLiQ interface; and the -Z suffix flags one or more factory-configured special options that must be confirmed against the original order documentation before procurement.

This motor is not a generic servo unit. Its hardware architecture is tightly coupled to the SINAMICS S120 drive ecosystem through the DRIVE-CLiQ serial interface, which carries encoder position data, motor nameplate parameters, and thermal sensor readings over a single cable — eliminating the resolver-to-digital conversion latency present in legacy analog encoder chains and reducing wiring complexity by approximately 40% compared to conventional TTL incremental encoder setups.

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Technical Parameters

Hardware Logical Analysis

Permanent-Magnet Rotor Architecture: The 1PH8081 uses a surface-mounted rare-earth permanent magnet rotor, which produces a near-sinusoidal air-gap flux density distribution. This geometry minimizes cogging torque — typically held below 1.5% of rated torque — which is critical for low-speed precision positioning in grinding spindles and semiconductor handling equipment. The rotor inertia is deliberately kept low relative to the frame size, yielding a high torque-to-inertia ratio that supports acceleration ramps exceeding 10,000 rpm/s in lightly loaded axes.

Forced Ventilation Thermal Management: The suffix U designates an integrated axial fan mounted on the non-drive end (NDE) of the motor shaft. This fan generates a directed airflow of approximately 35–50 m³/h through the motor housing, maintaining winding temperatures within Class F limits even at 100% duty cycle and rated torque. Unlike self-cooled (IC 410) variants, the forced-ventilation design decouples thermal performance from shaft speed, allowing full torque delivery at speeds as low as 0 rpm — a requirement in clamping and pressing applications where the motor must hold position under load without rotation.

DRIVE-CLiQ Absolute Encoder Interface: The 3NA1 encoder option integrates a 20-bit singleturn / 12-bit multiturn absolute encoder directly onto the motor’s NDE flange. Data transmission occurs over the DRIVE-CLiQ protocol — a Siemens-proprietary serial interface operating at 100 Mbit/s full-duplex over a standard RJ45 connector. The encoder module stores motor-specific electronic nameplate data (rated current, pole pairs, thermal model coefficients) in an onboard EEPROM. Upon power-up, the SINAMICS S120 Control Unit reads this data automatically, eliminating manual parameter entry and reducing commissioning time by a measurable margin compared to resolver-based systems. The absolute multiturn capability means the drive retains axis position across power cycles without requiring a reference traverse — a functional prerequisite for safety-relevant axes governed by SIL 2 / PLd safety functions.

EMC Design and Shielding: The motor housing is constructed from die-cast aluminum alloy with a continuous conductive surface, providing a Faraday shield effect against radiated emissions. The power cable entry uses a 360° EMC cable gland interface, ensuring the cable shield is terminated to the motor housing with low-impedance contact over the full circumference. This design approach suppresses common-mode current injection into the encoder cable — a primary source of position jitter in high-frequency PWM drive environments operating at switching frequencies above 4 kHz.

Bearing and Mechanical Precision: The drive-end (DE) bearing is a deep-groove ball bearing selected for combined radial and axial load capacity, with a calculated L10 bearing life exceeding 20,000 hours at rated speed and nominal radial load. The shaft runout is held to ≤ 0.02 mm TIR at the shaft end, consistent with IEC 60072 tolerance class N, ensuring concentricity with coupled gearboxes or direct-drive load elements.

System Integration Benefits

• Zero-homing absolute position retention: The multiturn absolute encoder preserves axis position across power-down events, eliminating reference traverse cycles that consume machine cycle time in multi-axis systems.
• Plug-and-play SINAMICS commissioning: The DRIVE-CLiQ electronic nameplate transfers all motor parameters to the Control Unit automatically at first power-up, reducing parameterization errors and shortening commissioning from hours to minutes.
• Full-torque delivery at zero speed: Forced ventilation decouples thermal limits from rotational speed, enabling sustained holding torque in clamping, pressing, and vertical axis applications without thermal derating.
• Integrated thermal monitoring: The KTY84 temperature sensor embedded in the stator winding feeds real-time temperature data to the SINAMICS drive, enabling predictive thermal derating before winding damage occurs — reducing unplanned downtime.
• Safety Integrated compatibility: When paired with a SINAMICS S120 Safety Integrated drive, the motor supports STO (Safe Torque Off), SS1 (Safe Stop 1), and SLS (Safely Limited Speed) without external safety relays, simplifying machine safety architecture to PLd / SIL 2.
• TIA Portal Startdrive integration: The motor is fully supported in Siemens Startdrive within TIA Portal V15 and later, enabling graphical axis configuration, automatic drive optimization (One Button Tuning), and online diagnostics from a single engineering environment.
• Low cogging torque for surface-finish-critical applications: The sinusoidal flux distribution and skewed stator slots suppress torque ripple, which directly reduces surface roughness in grinding and turning operations driven by this motor.
• Standardized IEC flange interface: The SH 80 flange geometry conforms to IEC 60072, ensuring mechanical interchangeability with SIMOGEAR gearboxes and third-party planetary reducers without custom adapter plates.
• Scalable multi-axis architecture: Multiple 1PH8081-1SU02-3NA1-Z motors can be connected to a single SINAMICS S120 line module via a shared DC bus, enabling energy recovery from decelerating axes to power accelerating axes — reducing peak grid demand by up to 30% in coordinated multi-axis systems.

Quality Assurance & Global Logistics

Every 1PH8081-1SU02-3NA1-Z unit shipped from our Xiamen, China facility is sourced through verified Siemens-authorized distribution channels. Each motor undergoes a structured incoming inspection protocol: visual examination of housing, shaft, and connector integrity; label and serial number cross-verification against Siemens production records; and encoder communication validation using a DRIVE-CLiQ test interface to confirm data transmission integrity before dispatch.

Original Siemens packaging, including anti-static foam inserts and moisture-barrier bags, is preserved throughout the storage and handling process. Batch traceability records and certificates of conformity are available upon request for quality-audited procurement environments.

Logistics from Xiamen operate via DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 3–5 business days to Europe and North America, and 2–4 business days to Southeast Asia. All shipments are export-compliant under applicable EAR/ECCN classifications. Commercial invoices, packing lists, and HS code documentation are prepared to facilitate customs clearance in destination countries. For time-critical requirements, same-day dispatch is available for orders confirmed before 14:00 CST.

A 12-month warranty covers all units against manufacturing defects and encoder communication failures. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit at our Xiamen facility.

Contact Information

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