The YASKAWA SGM7G-13AFC61 is a Sigma-7 (SGM7G) rotary AC servo motor built for industrial motion systems that demand high torque density, stable low-speed behavior, and repeatable performance in continuous production. In a well-designed servo axis, the motor is not just a power source—it is the mechanical “output layer” of a closed-loop control system. The controller defines motion profiles, the servo drive regulates current to create torque, and the motor converts that torque into predictable rotation while feeding back position and speed information. The SGM7G family is positioned for heavier-duty automation where medium inertia and large torque are practical priorities, and Yaskawa specifically highlights the SGM7G line for robust performance and a rated speed class around 1500 rpm across a wide power range.
A key point about the SGM7G design philosophy: it is meant to keep motion boringly consistent. In real factories, the enemy is not “insufficient peak torque” as often as it is variation—in load, friction, temperature, or cycle timing. These variations show up as overshoot, vibration, settling delays, nuisance alarms, and gradual loss of accuracy. Sigma-7 motors like the SGM7G series are commonly selected because they support tighter control behavior, cleaner acceleration/deceleration, and repeatable positioning when properly matched with a compatible Sigma-7 drive and correctly commissioned.
Where motors like SGM7G-13AFC61 typically get used
The 1.3 kW class is common in equipment where the axis needs more authority than small “high-speed” servos but does not require very large frame sizes. Typical applications include indexing tables, packaging and converting machines, material-handling sub-axes, printing/labeling, assembly automation, and retrofit upgrades where a stable torque response is preferred over chasing higher RPM. This fits the broader SGM7G product positioning: compact footprint relative to output capability, and strong torque characteristics for larger automation components.
Interpreting the model at a practical level
Public listings for SGM7G-13AFC61 commonly describe it as AC 200 V class, 1.3 kW, rated torque 8.34 N·m, rated speed 1500 r/min, which matches the general Sigma-7 SGM7G performance profile and aligns with distributor-style technical descriptions.
(As always: final verification should come from your motor nameplate + the matching Yaskawa documentation used for your exact servo pack and feedback configuration.)
Key Specifications (With Weight)
| Item | Value / Description |
|---|---|
| Brand | YASKAWA |
| Model | SGM7G-13AFC61 |
| Product Family | Sigma-7 Rotary Servo Motors (SGM7G) |
| Voltage Class (common for this model family) | AC 200 V class |
| Rated Output (common for this model family) | 1.3 kW |
| Rated Speed (SGM7G family) | 1500 r/min class |
| Rated Torque (commonly listed for 1.3 kW SGM7G variant) | 8.34 N·m |
| Instantaneous Max Torque (same 1.3 kW frame reference) | 23.3 N·m |
| Encoder (series-level behavior) | Sigma-7 motors commonly use high-resolution feedback; many listings describe 24-bit incremental/serial encoder configurations |
| Product Weight (reference) | Approx. 7.1 kg |
Performance characteristics that matter in commissioning
1) Strong torque behavior at practical speeds
Many production machines do not spend most of their life at peak RPM—they operate in a rhythm of acceleration, constant speed, deceleration, dwell, and holding. In this pattern, what matters is not only peak torque but how smoothly and predictably torque is produced during changes in velocity and load. The SGM7G platform is designed around that heavier-duty “automation reality,” offering solid torque capability while maintaining medium inertia characteristics.
2) Repeatability is a system outcome, not a brochure line
Servo repeatability depends on motor + drive tuning + mechanical stiffness + feedback quality. The motor contributes by having stable electromagnetic behavior and a mechanical structure that supports consistent response. In practice, users typically see the most benefit when:
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The axis inertia ratio is sensible (not wildly mismatched).
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Couplings, belts, or gear reducers are aligned and not introducing oscillation.
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Feedback and power wiring follow clean EMC practices (shielding, grounding, cable routing).
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Tuning aims for fast settling without chasing overly aggressive gains.
This is where a motor like SGM7G-13AFC61 tends to be appreciated: it supports high-quality motion when the rest of the system is built like an engineering project rather than a late-night “it fits if you kick it” project.
3) Mechanical integration: the quiet source of failures
Servo motors often get blamed for faults that are actually mechanical:
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Misalignment causing bearing stress and vibration
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Loose couplings producing periodic position error
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Belt tension variation creating resonance bands
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Gearbox backlash forcing aggressive tuning that becomes unstable
If an axis becomes noisy, hot, or inconsistent, it’s worth checking mechanical runout, coupling alignment, and load bearings before assuming the motor is the root cause.
Typical application fit
The SGM7G-13AFC61 is a rational choice for:
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Rotary indexing and positioning (tables, dial machines, rotary cutters)
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Packaging motion (feed rollers, seal mechanisms, cut-to-length stations)
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Handling and automation (pushers, diverters, synchronized conveyors)
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Retrofit replacements where restoring closed-loop motion stability is the goal
The common thread is that these machines reward motors that deliver controlled torque and consistent response, not just “more power.”
Summary
The YASKAWA SGM7G-13AFC61 is a Sigma-7 SGM7G rotary servo motor aimed at industrial axes that need stable, repeatable motion with strong torque capability in a medium-inertia platform. The SGM7G family is positioned for robust automation performance and a rated speed class around 1500 rpm across a wide output range.
