The YASKAWA SGM7A-15A6A2E is an AC servo motor from YASKAWA’s Sigma-7 motor lineup, built for industrial motion systems where speed stability, positioning accuracy, and repeatable torque are more important than raw rotation alone. In modern automation, the servo motor is essentially the “muscle with a nervous system”: it converts electrical energy into controlled mechanical motion while continuously cooperating with the servo drive and controller to correct errors in real time. When that closed-loop relationship is stable, machines run faster, settle more cleanly after moves, and maintain quality across long production shifts.
Unlike general-purpose motors that are optimized mainly for constant-speed rotation, a servo motor is intended for dynamic motion: accelerating quickly, stopping precisely, holding position under load disturbances, and repeating these patterns thousands or millions of times. The SGM7A-15A6A2E is typically selected in equipment where those dynamic behaviors translate directly into throughput and product consistency, such as automated assembly, packaging machinery, indexing stations, material transfer axes, and precision handling systems. In these applications, performance is not measured only by how fast an axis can move, but by how accurately it can move, how quickly it can settle without oscillation, and how reliably it can repeat the same motion profile day after day.
In many factories, servo systems also play a strategic role: they enable machine standardization. If an OEM designs around a known servo family, spare parts planning becomes simpler, technicians gain familiarity faster, and commissioning practices become more repeatable across different machine models. YASKAWA’s Sigma-7 platform is widely used in this way because it is a mature motion ecosystem with consistent engineering conventions. The motor model code helps identify the motor family and integration class, allowing maintenance teams to reduce guesswork when checking compatibility, cabling, and drive pairing.
From a motion-control perspective, the most valuable trait in a servo motor is controlled behavior under change. Real machines are rarely ideal: loads shift, friction changes with temperature, belts age, and mechanical resonance can appear at certain speeds. A servo motor like the SGM7A-15A6A2E, used with a compatible Sigma-7 drive and properly tuned, can help maintain smooth motion even as conditions drift. This matters because unstable motion is expensive. It can cause misalignment, inconsistent force application, increased mechanical wear, and reduced overall equipment effectiveness. Stable servo control reduces those risks by keeping the axis under continuous correction.
The SGM7A-15A6A2E is also a sensible choice when your design needs margin. Many engineers prefer to choose a motor that can handle the required motion profile without operating continuously near its limits. That margin can support cooler operation, better tolerance to sudden load changes, and improved reliability over time. It can also provide flexibility if the machine is later upgraded with heavier tooling, faster cycle times, or additional axis coordination demands.
Product Overview Table
| Item | Details |
|---|---|
| Brand | YASKAWA |
| Series | SGM7A (Sigma-7 AC Servo Motor) |
| Model | SGM7A-15A6A2E |
| Product Category | Industrial AC Servo Motor |
| Primary Function | High-precision speed and position control in closed-loop motion systems |
| Typical Pairing | Works with compatible Sigma-7 servo drives and motion controllers |
| Common Machine Types | Packaging machines, assembly automation, indexing tables, handling systems |
| Motion Capabilities (General) | Dynamic acceleration/deceleration, precise stopping, stable holding control |
| Key Value | Repeatable performance and controllable behavior across long duty cycles |
| Integration Focus | Industrial mounting formats, production-ready wiring practices, serviceability |
Typical Applications and Why This Motor Is Used
High-cycle packaging and labeling
Packaging machines often perform repetitive moves with tight timing windows. The servo motor must accelerate quickly, reach stable speed, and stop without shaking the mechanism. When the axis settles cleanly, it reduces registration errors, improves sealing consistency, and helps the machine maintain speed without causing jams or product damage.
Automated assembly and precision handling
Assembly systems depend on repeatable positioning. If the motor overshoots or oscillates after a move, it can create alignment issues for pressing, fastening, dispensing, or inspection steps. Stable servo behavior reduces cycle time by allowing the next operation to begin sooner after positioning.
Material transfer and synchronized conveyors
Synchronized motion requires predictable servo response. When multiple axes must coordinate, consistent torque and speed control reduce drift and help prevent collisions, mispicks, and timing mismatches.
Engineering Considerations (What to Check Before Using SGM7A-15A6A2E)
Even an excellent servo motor can perform poorly if it is mismatched or installed carelessly. These checks are commonly used in real projects:
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Drive compatibility and sizing
Confirm the Sigma-7 servo drive model supports this motor and that the drive’s capacity aligns with the axis load and duty cycle. Correct sizing helps ensure stable tuning and avoids nuisance faults during acceleration peaks. -
Load inertia and mechanical transmission
Review the inertia ratio and transmission design (couplings, belts, gearboxes). Servo performance depends heavily on how the load behaves, not just the motor itself. A mechanically “soft” system can introduce resonance that must be addressed in tuning and mechanical design. -
Cabling and grounding discipline
Servo systems are sensitive to electrical noise. Use correct motor power and feedback cables, apply proper shielding methods, and keep high-noise power lines separated from signal wiring where practical. -
Thermal environment and enclosure planning
Ensure ventilation and avoid heat stacking. Continuous high-duty motion can generate heat in the motor and the drive, and stable temperature supports stable mechanical tolerances and longer component life.
Installation and Maintenance Practices That Improve Service Life
In production environments, reliability often comes from discipline rather than luck:
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Mechanical alignment: Poor alignment increases bearing loads and vibration. Use appropriate couplings and verify alignment during installation.
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Connector integrity: Ensure connectors are fully seated, strain relieved, and protected against repeated bending or pulling.
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Routine checks: Inspect cable wear points, listen for changes in bearing noise, and monitor any drift in motion quality that could indicate mechanical loosening or load changes.
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Parameter consistency: When replacing a motor, verify the drive parameters and tuning settings remain appropriate for the axis. A correct replacement is not only a mechanical swap; the control system settings matter as well.
Why the SGM7A-15A6A2E Is a Practical Choice
The YASKAWA SGM7A-15A6A2E is most valuable for users who need motion they can trust: repeated acceleration and stopping without unstable behavior, predictable control response for coordinated axes, and an integration path that suits industrial automation practices. In many factories, the best servo motor is the one that disappears into the machine—quietly doing its job while the line hits its production targets.
When selected with a compatible Sigma-7 drive, installed with good wiring and mechanical alignment practices, and tuned appropriately for the load, this motor can support high-quality motion control in demanding automation systems. It fits well in OEM designs that value repeatability, serviceability, and long-term stability more than one-off peak performance claims.
