YASKAWA USAHEM-01-TL31 AC Servo Motor – Sigma-II Series

YASKAWA USAHEM-01-TL31: 100W Sigma-II Permanent Magnet Servo Motor for High-Precision Motion Axes

The USAHEM-01-TL31 is a 100 W (0.1 kW) permanent magnet synchronous AC servo motor from YASKAWA Electric Corporation’s Sigma-II platform. Within a 40 mm square flange envelope, it delivers a rated torque of 0.318 N·m at 3,000 rpm, a peak speed ceiling of 5,000 rpm, and an IP67 shaft-end seal — a combination that positions it as the standard selection for compact, high-cycle motion axes in semiconductor handling, precision packaging, and laboratory automation. The motor is designed exclusively for closed-loop operation with YASKAWA SGDH-series servo drives, forming a tightly coupled drive-motor system whose electrical and mechanical parameters are factory-matched to eliminate manual tuning overhead.

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Technical Parameters

Hardware Logical Analysis

The USAHEM-01-TL31 is built around a skewed-rotor PMSM topology. Rotor skewing distributes the magnetic flux transition across multiple stator slots simultaneously, which attenuates cogging torque — the periodic reluctance-induced torque ripple that degrades velocity uniformity at low speeds. In scanning and contouring applications where axis velocity must remain constant within ±0.1%, cogging suppression at the motor hardware level is more reliable than software-based feed-forward compensation alone.

The stator windings are wound in a distributed configuration with Class F insulation (155 °C thermal limit), providing a thermal margin of approximately 55 °C above the 100 °C winding temperature typical at rated continuous load. This margin allows short-duration overload cycles — up to 3× rated torque for ≤2 seconds — without triggering thermal derating, which is essential for applications with high-inertia loads that demand aggressive acceleration ramps.

The IP67 shaft seal on the TL31 variant is a contact-type radial lip seal integrated at the motor’s drive-end bearing housing. It maintains ingress protection against coolant splash, cutting fluid mist, and wash-down water jets at pressures up to 1 bar, without requiring an external shaft seal adapter. The bearing preload is set at the factory to minimize axial play (<0.05 mm), which is critical when the motor shaft is directly coupled to a ball screw or precision gear without a flexible coupling.

EMC performance is addressed through the motor’s shielded cable interface. The encoder connector (MS3102A20-29P equivalent) accepts a shielded twisted-pair cable (YASKAWA JZSP-CMP00-xx series) with 360° shield termination at both the motor and drive ends. This topology suppresses common-mode noise injection into the encoder differential signal lines (A+/A−, B+/B−, Z+/Z−), maintaining signal integrity at cable runs up to 20 m in environments with variable-frequency drive interference and high-current bus bars in proximity.

The 2,048 P/R incremental encoder outputs quadrature A/B signals with a Z index pulse once per revolution. After ×4 edge counting in the SGDH drive’s DSP, effective resolution reaches 8,192 counts/rev — equivalent to a minimum detectable angular displacement of 0.044°. At 3,000 rpm, the encoder signal frequency reaches 102.4 kHz, well within the SGDH drive’s 4 MHz input counter bandwidth, ensuring no pulse loss at maximum speed.

System Integration Benefits

• Factory-matched drive-motor parameter set: The SGDH drive stores USAHEM-01-TL31 motor constants (Ke, Kt, Rs, Ls, rotor inertia) in its EEPROM. On first power-up, the drive reads motor type from the encoder ID signal and loads the correct current-loop gains automatically, eliminating manual parameter entry and reducing commissioning time to under 30 minutes for a standard axis.
• One-parameter auto-tuning: SGDH’s online auto-tuning algorithm measures load inertia ratio in real time during a short jog cycle and adjusts position, velocity, and current loop gains accordingly. This is particularly valuable for OEM machine builders who need repeatable axis performance across production batches without per-machine tuning.
• Deterministic current-loop execution: The SGDH drive executes its current control loop at a 16 kHz switching frequency (62.5 µs period), providing a current bandwidth of approximately 2 kHz. This bandwidth is sufficient to track torque commands from a 500 Hz velocity loop without phase lag, maintaining velocity regulation within ±0.01% at rated load.
• Fieldbus compatibility via MECHATROLINK-II: When paired with an SGDH-□□AE drive variant, the USAHEM-01-TL31 integrates into MECHATROLINK-II networks at 10 Mbps with a 0.5 ms or 1 ms cycle time. This enables synchronous multi-axis coordination with position error <1 encoder count across axes, which is required for electronic gearing and cam profiling applications.
• Diagnostic transparency: The SGDH drive exposes 16 alarm codes and 8 warning codes via its front-panel display and serial monitor port. Motor-side faults — including encoder signal loss, overheat (thermistor input), and overcurrent — are individually identified, allowing maintenance personnel to isolate the fault source without oscilloscope measurement.
• Compact installation footprint: The 40 mm flange and 0.5 kg mass allow direct mounting on aluminum extrusion frames and lightweight gantry structures without requiring additional motor support brackets. The keyway shaft (TL31) accepts standard DIN 6885 keys for positive torque transmission to timing pulleys and couplings.
• Broad supply voltage tolerance: The motor operates on 200–230 VAC single-phase or 3-phase supply, accommodating both Japanese 200 V and European 230 V grid standards without rewiring. This simplifies global machine deployment for OEM builders targeting multiple markets.
• Long bearing service life: Precision deep-groove ball bearings with factory-applied grease (rated for 20,000–30,000 hours at rated radial load) reduce scheduled maintenance intervals. Bearing replacement is the primary mechanical maintenance event; the sealed stator winding requires no periodic service under normal operating conditions.

Quality Assurance & Global Logistics

Every YASKAWA USAHEM-01-TL31 unit dispatched from our Xiamen, China facility is a genuine YASKAWA product sourced through verified supply channels. Pre-shipment inspection covers label authenticity, serial number format validation against YASKAWA’s naming convention, shaft runout measurement (<0.02 mm TIR), connector pin integrity, and encoder signal verification using a bench-mounted SGDH drive. Units that do not pass all inspection checkpoints are quarantined and not dispatched.

Packaging uses anti-static foam inserts within double-wall corrugated cartons. The motor shaft is protected with a plastic end cap, and the encoder connector is covered with a dust plug during transit. For air freight shipments, cartons are additionally wrapped in moisture-barrier poly film to prevent condensation during altitude transitions.

Logistics from Xiamen port to major industrial hubs: DHL Express to Germany (Frankfurt) in 3–5 business days; to the United States (Los Angeles) in 4–6 business days; to Japan (Tokyo) in 2–3 business days; to Southeast Asia in 1–3 business days. Sea freight consolidation is available for orders exceeding 20 units. All shipments include a commercial invoice, packing list, and certificate of origin for customs clearance. HS Code 8501.52 applies for servo motor classification in most jurisdictions.

A 12-month warranty from the dispatch date covers manufacturing defects under normal operating conditions as defined in YASKAWA’s product specification. Warranty claims are processed by submitting the unit serial number, fault description, and operating log data (if available from the SGDH drive monitor). Replacement or repair is completed within 15 business days of unit receipt at our Xiamen facility.

Contact Information

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