YASKAWA SGM-01U3AP01 AC Servo Motor – Sigma Series

YASKAWA SGM-01U3AP01 Sigma Series AC Servo Motor — Core Role in Closed-Loop Motion Control

The YASKAWA SGM-01U3AP01 is a brushless AC servo motor belonging to YASKAWA Electric Corporation’s original Sigma (SGM) Series, rated at a continuous shaft speed of 3,000 RPM. Within a closed-loop servo axis, this motor functions as the torque-generating actuator whose rotor position is continuously reported to the paired SERVOPACK drive via an incremental or absolute encoder. The drive closes the position, velocity, and current loops at update rates typically in the range of 62.5 µs to 250 µs, enabling sub-millimeter positioning repeatability across the full speed range.

The “SGM” prefix identifies the motor as part of YASKAWA’s foundational Sigma platform, which preceded the Sigma-II (SGMAH) and Sigma-III (SGMAS) generations. The model suffix breakdown is as follows: 01 = rated output class (approximately 100 W); U3 = encoder specification (2,048 P/R incremental encoder); A = no holding brake; P = standard shaft; 01 = connector orientation. This suffix-level analysis is critical for correct drive pairing and cable selection during system commissioning.

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Technical Parameters

Hardware Logical Analysis

The SGM-01U3AP01 employs a permanent magnet synchronous motor (PMSM) topology with a surface-mounted rare-earth magnet rotor. At the 100 W output class, the stator winding geometry is optimized for a low pole-pitch-to-slot ratio, which directly reduces cogging torque — a critical parameter in applications requiring smooth velocity at speeds below 10 RPM, such as tension control or slow-speed contouring.

The 2,048 P/R incremental encoder (U3 suffix) outputs A, B, and Z quadrature signals. After ×4 edge interpolation in the SERVOPACK’s encoder interface ASIC, the effective position resolution reaches 8,192 counts per revolution, yielding an angular resolution of approximately 0.044° per count. This resolution is adequate for the majority of general-purpose servo axes in packaging, textile, and light assembly machinery.

From an EMC design perspective, the SGM series motor housing is a fully enclosed die-cast aluminum shell that provides a continuous Faraday shield around the stator windings. The encoder cable shield must be terminated at the SERVOPACK chassis ground — not the signal ground — to prevent common-mode noise injection into the encoder differential pair. YASKAWA specifies a maximum encoder cable length of 20 m for the SGDA/SGDB drive family when using standard JZSP-CMP series cables; exceeding this length without a line driver repeater will degrade signal integrity at high RPM.

The motor’s thermal management relies on natural convection through the finned aluminum housing. At continuous rated load (100 W output, 3,000 RPM), the housing surface temperature rise above ambient is typically 40–55 °C under still-air conditions. In enclosed machine cabinets or high-ambient environments (>40 °C), a derating curve must be applied per the YASKAWA SGM series catalog, Section 3.4.

The IP65 shaft seal is implemented via a contact lip seal on the drive-end bearing cap. This seal is rated for coolant splash and light dust ingress but is not suitable for submersion or high-pressure washdown. The non-drive end (encoder end) is sealed to IP54 by the encoder cover gasket. Engineers specifying this motor for food-grade or washdown environments should evaluate the SGM-01U3AP21 variant with enhanced sealing.

System Integration Benefits

• Direct SERVOPACK pairing without parameter mapping: The SGM-01U3AP01 is factory-coded for YASKAWA SGDA/SGDB drives. Motor constants (Ke, Kt, inertia, rated current) are pre-loaded in the drive’s motor parameter table, eliminating manual entry and reducing commissioning risk.
• Deterministic velocity loop bandwidth: At 100 W output class, the rotor inertia is low enough to support velocity loop bandwidths of 200–400 Hz when paired with a stiff mechanical coupling, enabling fast disturbance rejection in high-cycle indexing applications.
• Encoder Z-pulse homing reliability: The single-turn Z-pulse of the 2,048 P/R encoder provides a repeatable homing reference with ±0.5 count accuracy, sufficient for applications where absolute encoders are not required and cost is a constraint.
• Compact 100 W form factor for multi-axis density: The small frame size allows multiple axes to be mounted in close proximity on a machine base without thermal interference between adjacent motors, supporting high-density multi-axis gantry designs.
• Broad controller compatibility via analog ±10 V or pulse-train interface: The SGDA/SGDB SERVOPACK accepts both analog speed/torque commands and pulse-train position commands, allowing integration with PLCs (Siemens S7, Mitsubishi Q/L, Omron NJ) without a dedicated motion controller.
• Diagnostic transparency via SERVOPACK alarm history: The paired drive logs up to 10 alarm codes with timestamps, enabling root-cause analysis of overcurrent, encoder error, or overload faults without external data logging hardware.
• Regenerative energy handling: At 100 W output class, the SGDA/SGDB internal regenerative resistor is sufficient for most deceleration profiles. For high-inertia loads or frequent stop-start cycles, an external regenerative resistor (YASKAWA JUSP-RA series) can be added without drive replacement.
• SigmaWin+ software integration: YASKAWA’s PC-based commissioning tool supports auto-tuning, FFT vibration analysis, and trace monitoring for the SGM/SGDA platform, reducing setup time from hours to minutes for experienced engineers.

Quality Assurance & Global Logistics

Every YASKAWA SGM-01U3AP01 unit dispatched from our Xiamen, China facility is sourced through verified industrial supply channels and undergoes a structured pre-shipment inspection protocol:

• Visual inspection of motor housing, shaft runout check, connector pin integrity, and nameplate legibility verification against YASKAWA documentation
• Encoder connector continuity test and shield integrity check prior to packaging
• Cross-reference of all reference part numbers against YASKAWA’s official parts database
• Anti-static foam packaging with humidity indicator card and desiccant sachet for international air freight
• Traceability documentation (inspection report, packing list, commercial invoice) provided with every shipment
• 12-month warranty covering manufacturing defects and functional failures under normal operating conditions

Logistics from Xiamen, China to global destinations is handled via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times: 3–5 business days to Europe and North America; 2–4 business days to Southeast Asia and Japan. Air waybill tracking is provided within 24 hours of dispatch. For urgent MRO requirements, same-day dispatch is available for in-stock units ordered before 14:00 CST.

Contact Information

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