The YASKAWA SGM7A-15A7A2E is an AC servo motor from YASKAWA’s Sigma-7 motion platform, engineered for industrial automation where motion quality, repeatability, and control stability matter more than simply “turning fast.” In a servo system, the motor is not operating alone. It works as part of a closed-loop chain that includes a servo drive, feedback processing, and a motion controller. The controller issues a command, the drive regulates current to generate torque, and feedback enables continuous correction. This loop is what allows a servo axis to accelerate aggressively, stop precisely, and hold position under changing load conditions.
In production environments, the “real” performance target is usually consistency. Machines do not run in laboratory conditions. Load inertia can vary as product size changes, friction shifts with temperature, gearboxes develop backlash over time, and resonance appears when mechanisms age or speeds increase. A servo motor is valuable when it helps the entire axis remain stable in spite of those changes. The SGM7A-15A7A2E, as part of the Sigma-7 family, is commonly deployed in equipment where stable dynamic motion is a requirement: packaging lines, automated assembly stations, indexing mechanisms, material transfer axes, and synchronized motion systems.
What separates a servo motor selection from a generic motor selection is the motion profile. Many industrial axes repeatedly perform short, high-acceleration moves, then hold a position while a process happens, then return. That pattern creates frequent changes in torque demand and requires strong control over both transient behavior (how it starts and stops) and steady-state behavior (how it holds and resists disturbances). In poorly matched systems, these transitions create vibration, overshoot, or long settling times. Those issues reduce throughput, increase wear, and can directly harm product quality. A properly specified Sigma-7 motor and compatible drive can help reduce these problems by maintaining a controllable torque response and supporting stable tuning practices.
The SGM7A-15A7A2E is often considered when designers want a predictable servo axis with enough margin for dynamic loads. Margin is not only about power—it is about keeping the axis out of “stress territory” so that thermal behavior, control stability, and mechanical loads remain manageable over long shifts. When a servo axis runs too close to its limits, it may heat up more quickly, trigger protective events, or develop performance drift. Selecting a motor with appropriate capacity for the duty cycle helps reduce these risks.
From a lifecycle perspective, motors in the Sigma-7 ecosystem are also attractive because they support standardized maintenance practices. Plants that operate multiple machines often benefit from using a consistent servo family: spare parts strategy becomes simpler, wiring conventions can be reused, and technicians become faster at diagnosing issues because the system behavior is familiar. The model designation SGM7A-15A7A2E provides a clear identity for procurement and service teams, helping them avoid incorrect substitutions that can cause drive incompatibility or unstable tuning.
Below is a structured overview of the product, followed by application guidance and integration notes designed for practical industrial use and clear search indexing.
Product Overview Table
| Item | Details |
|---|---|
| Brand | YASKAWA |
| Motion Platform | Sigma-7 |
| Motor Series | SGM7A |
| Model | SGM7A-15A7A2E |
| Product Type | Industrial AC Servo Motor |
| Primary Function | Closed-loop torque generation for precision speed and position control |
| Typical Pairing | Compatible Sigma-7 servo drives and motion controllers |
| Common Use Environments | Packaging, assembly automation, indexing, handling, general machinery |
| Key System Value | Repeatable motion, stable response, reduced vibration risk when correctly integrated |
Application Scenarios and Practical Benefits
1) High-cycle packaging and converting equipment
Packaging machines depend on controlled acceleration and smooth stopping. If the motor overshoots or causes mechanical shock, the process becomes unstable: product placement shifts, sealing quality changes, and registration errors increase. The SGM7A-15A7A2E can be used in axes such as feed rollers, cut-to-length stations, and indexing conveyors where consistent motion behavior directly supports throughput and quality.
2) Automated assembly, fastening, and inspection
Assembly stations often require precise stops and stable holding. For example, a fixture may need to position a part within tight tolerances before a pressing or fastening step. If the axis oscillates after stopping, the process either slows down or becomes inconsistent. A servo motor chosen for stable closed-loop control supports faster settling and more repeatable positioning, enabling higher cycle rates without sacrificing accuracy.
3) Material transfer and coordinated motion systems
Transfer units, gantries, and multi-axis mechanisms require predictable response to maintain coordination. When one axis lags or oscillates, the entire mechanism can lose synchronization. In systems that coordinate speed and timing, stable servo behavior helps maintain alignment and reduces the risk of jams, collisions, or mispicks.
Application Fit Table
| Application Type | Typical Motion Demand | What Matters Most | Why SGM7A-15A7A2E Is Chosen |
|---|---|---|---|
| Packaging / labeling | Fast start-stop, short moves | Smooth acceleration, stable stop | Supports repeatable motion under high cycle count |
| Assembly / fixtures | Precise positioning and hold | Fast settling, minimal oscillation | Helps reduce cycle time and improves repeatability |
| Transfer / handling | Variable loads, coordinated moves | Disturbance rejection, stable torque | Better control stability when loads change |
| Indexing mechanisms | Repeated positioning | Accuracy and repeatable response | Maintains consistent movement behavior |
Integration Guidance (Engineering-Focused)
Because servo performance depends on system design, the following considerations are typically the highest-value checks when specifying SGM7A-15A7A2E:
Drive pairing and control compatibility
The motor should be paired with a Sigma-7 servo drive that supports the correct motor class. Capacity matching should reflect the real duty cycle, not only the average operating point. A drive that is too small can cause frequent overload trips or unstable tuning. A drive that is far oversized can reduce practical tuning resolution and may not improve performance in a meaningful way.
Mechanical transmission and inertia management
Servo axes behave differently depending on the stiffness of the mechanical path. Belts and long couplings can introduce compliance, while gearboxes can introduce backlash. These factors can create resonance at specific speeds. A clean mechanical design reduces the burden on tuning and improves the axis’s ability to stop accurately without vibration.
Noise control and cable discipline
Servo systems can be sensitive to electromagnetic noise. Using correct cabling and shielding practices, keeping signal wiring away from high-noise power wiring, and ensuring proper grounding helps prevent intermittent faults and improves the stability of feedback signals.
Thermal planning
Servo motors operate best when the environment supports stable temperature. Overheated enclosures can reduce system margin and shorten service life. Good airflow, correct mounting practices, and avoiding heat stacking near high-loss components can improve long-term stability.
Integration Checklist Table
| Category | What to Confirm | Why It Matters |
|---|---|---|
| Drive compatibility | Correct Sigma-7 drive model and motor support | Prevents mismatch and control instability |
| Duty cycle sizing | Peak acceleration and continuous demand | Avoids overload trips and thermal stress |
| Mechanical stiffness | Coupling, belt, gearbox behavior | Reduces resonance and improves settling |
| Electrical installation | Shielding, routing, grounding | Reduces noise issues and intermittent faults |
| Environment | Temperature and contamination control | Improves reliability and service life |
Maintenance and Lifecycle Practices
For long-term industrial use, servo motor reliability is strongly influenced by installation quality and maintenance discipline:
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Alignment checks: Misalignment can increase bearing loads and create vibration that looks like “control problems” but is mechanical in origin.
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Cable strain relief: Repeated flexing or pulling at connectors can cause intermittent faults that are hard to diagnose. Proper routing and strain relief reduce risk.
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Parameter management: When a motor is replaced, ensure the drive configuration and tuning settings remain appropriate for the axis. Hardware replacement without parameter verification can lead to poor motion behavior.
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Condition monitoring: Changes in noise, heat, or position stability can indicate mechanical wear, loosening, or load changes. Early detection helps avoid unplanned downtime.
Summary
The YASKAWA SGM7A-15A7A2E is an industrial AC servo motor in the Sigma-7 SGM7A series, intended for automation systems that require stable dynamic motion, repeatable positioning, and reliable performance over high cycle counts. It fits packaging, assembly, indexing, and handling applications where motion quality influences yield and throughput. When paired with a compatible Sigma-7 servo drive and integrated with proper mechanical alignment, realistic sizing, and good electrical installation practices, it supports consistent closed-loop performance in real production conditions.
