Yaskawa SGMAS-01A2A-YR11 AC Servo Motor – Obsolete Sigma Series Spare Part

Technical Dossier

Product Details And Specifications

Yaskawa SGMAS-01A2A-YR11 AC Servo Motor – Obsolete Sigma Series Spare Part

When a Yaskawa SGMAS-01A2A-YR11 servo motor fails on a production line, the consequences extend far beyond the cost of the part itself. A single axis failure in a multi-axis Sigma-series servo system can halt an entire production cell. For facilities still operating legacy Yaskawa Sigma-I or Sigma-II servo architectures, the alternative to sourcing this exact motor is not a simple swap — it is a full servo system re-engineering project. Conservative estimates for such upgrades, including new servo drives, re-wiring, re-commissioning, and production downtime, routinely exceed hundreds of thousands of dollars. DriveKNMS maintains verified stock of the SGMAS-01A2A-YR11 specifically to protect facilities from that scenario.

Technical Specifications

Note: Electrical parameters beyond those listed above are not independently verified by DriveKNMS. Customers are advised to cross-reference the Yaskawa SGMAS series datasheet for full specifications prior to installation.

Solving the Discontinued Hardware Crisis

The Yaskawa Sigma servo platform was deployed extensively throughout the 1990s and 2000s in automotive assembly, semiconductor handling, packaging, and precision machining applications. Many of these installations remain in active production today — not because the technology is outdated for the task, but because the mechanical and electrical infrastructure built around them represents a capital investment that cannot be written off without significant justification.

The SGMAS-01A2A-YR11 is a 100W small-frame motor commonly used in auxiliary axes: part positioning, conveyor indexing, and tool-change mechanisms. Its failure does not always trigger an immediate line shutdown, but an unresolved fault in these axes accumulates into yield loss, cycle time degradation, and eventually a forced emergency stop at the worst possible moment.

Sourcing a verified replacement unit from DriveKNMS eliminates the engineering risk of substituting an incompatible motor. The SGMAS-01A2A-YR11 is a direct mechanical and electrical match for its original installation — no parameter re-tuning of the servo drive is required when replacing like-for-like.

How to extend your Yaskawa Sigma servo system's service life by 5 to 10 years:

• Maintain a minimum two-unit spare inventory for each critical servo axis. The cost of two SGMAS-01A2A-YR11 units is a fraction of one hour of unplanned downtime on a high-throughput line.
• Audit encoder cable condition annually. On legacy Sigma-series installations, encoder cable degradation is the leading cause of servo faults that are misdiagnosed as motor failure. Replacing cables before motor replacement is standard practice.
• Do not upgrade the servo drive without replacing the motor. Mixing Sigma-I motors with Sigma-II or Sigma-7 drives introduces encoder protocol mismatches that require additional hardware adapters and re-commissioning time.
• Document the current servo drive parameter file. Before any maintenance intervention, back up the drive parameters. This single step eliminates the most common source of post-maintenance production delays.
• Establish a vendor relationship for obsolete Yaskawa parts now, not during a breakdown. Lead times for verified obsolete servo motors sourced under emergency conditions are unpredictable. Pre-qualified sourcing channels reduce mean time to repair from days to hours.

Condition and Reliability Assurance

All SGMAS-01A2A-YR11 units supplied by DriveKNMS undergo a structured 5-step inspection protocol before shipment:

1. Visual and mechanical inspection: Frame integrity, shaft condition, connector pin inspection, and corrosion assessment on all mating surfaces.
2. Electrolytic capacitor assessment: Internal capacitor condition is evaluated where accessible. Units showing signs of electrolyte leakage or bulging are rejected.
3. Encoder signal verification: Encoder output is tested under rotation to confirm signal integrity before the unit is cleared for sale.
4. Winding resistance check: Phase-to-phase and phase-to-ground resistance measurements are taken to screen for winding degradation.
5. Firmware and label verification: Nameplate data is cross-referenced against the part number to confirm the unit matches the SGMAS-01A2A-YR11 specification. No relabeled or substituted units are accepted into inventory.

Units are classified as New Old Stock (NOS) or Tested Refurbished, and the classification is disclosed at the time of quotation.

Key Features for System Maintenance

• Drop-in replacement: The SGMAS-01A2A-YR11 is a direct mechanical substitute for the original installation. Mounting dimensions, shaft diameter, and connector pinout are unchanged.
• No servo drive re-programming required: When replacing a failed unit with an identical part number, existing drive parameters remain valid. This eliminates the need for a controls engineer to be present during the swap.
• Avoids engineering re-qualification costs: Substituting a different motor model — even one with similar ratings — requires servo drive parameter adjustment, safety validation, and in regulated industries, formal re-qualification. A like-for-like replacement bypasses this entirely.
• Preserves existing wiring and cabling: Connector compatibility means existing motor cables and encoder cables are reused without modification.

FAQ

What warranty applies to an obsolete part like the SGMAS-01A2A-YR11?
DriveKNMS provides a 90-day functional warranty on all tested units. The warranty covers failure under normal operating conditions and excludes damage resulting from installation error or incompatible drive configuration.

How do I confirm the unit is genuine and not a counterfeit?
All units are sourced through traceable supply channels. Nameplate data, date codes, and internal construction are verified against known-good reference units. Documentation of the inspection record is available upon request.

Should I buy more than one unit?
For any axis where a failure would halt production, holding a minimum of two spare units is the standard recommendation. The SGMAS-01A2A-YR11 is no longer manufactured, and market availability will decrease over time. Procurement cost today is lower than procurement cost under emergency conditions in the future.

Can DriveKNMS source other Yaskawa Sigma-series parts?
Yes. DriveKNMS specializes in obsolete and hard-to-find automation components across the Yaskawa Sigma product family, including servo drives, cables, and related peripherals. Submit your full BOM for a consolidated quotation.