The YASKAWA SGM7A-10AFA61 is a 1.0 kW low-inertia AC servo motor from the Sigma-7 family, designed for precise, fast motion in compact industrial machinery. It combines a high-resolution 24-bit encoder, robust mechanical construction, and IP67-class protection at the motor body when correctly installed, making it a strong choice for CNC, packaging, electronics assembly, and general automation equipment.
1. SGM7A-10AFA61 at a Glance
The following table summarizes the main technical ratings and dimensions of the SGM7A-10AFA61 servo motor. Key data points are taken from official Sigma-7 documentation and established distributor specifications.
| Item | SGM7A-10AFA61 Specification |
|---|---|
| Series | Sigma-7 SGM7A low-inertia AC servo motor |
| Rated output power | 1.0 kW |
| Rated line voltage | 200 V AC, 3-phase |
| Rated torque | 3.18 Nm |
| Peak (instantaneous) torque | 11.1 Nm |
| Rated speed | 3000 rpm |
| Maximum speed | 6000 rpm |
| Rated line current | Approx. 6.4 A |
| Encoder resolution | 24-bit serial incremental encoder |
| Shaft style | Straight shaft with key and tapped center |
| Motor moment of inertia | 0.971 × 10⁻⁴ kg·m² |
| Allowable load moment of inertia | Up to 20 × motor inertia |
| Height × width × depth | 96.7 × 80 × 162 mm |
| Approximate weight | 3.1 kg |
| Flange dimension (LC) | 80 mm |
| Flange diameter (LA) | 90 mm |
| Shaft diameter / length | 19 mm / 40 mm |
| Protection level (motor body) | Up to IP67 with proper mating connectors and cables |
| Ambient operating temperature | 0 to 40 °C (derating up to 60 °C) |
| Ambient humidity | 20–80% RH, non-condensing |
Data for power, torque, speed, inertia, outline dimensions, and environmental conditions are aligned with Yaskawa Sigma-7 technical references and drive-set specifications.
2. Design Focus: Low Inertia, High Response
The SGM7A-10AFA61 belongs to the low-inertia branch of the Sigma-7 lineup. Its rotor is engineered with a relatively small moment of inertia, enabling rapid acceleration and deceleration when paired with an appropriate load. This is especially useful in:
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Indexing axes with short move distances
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High-speed pick-and-place mechanisms
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Rapid positioning of small stages, heads, or rotary fixtures
Low inertia helps the motor follow demanding motion profiles without oversizing the drive. In a correctly tuned system, it allows tight servo gains, short settling times, and minimal following error, contributing directly to shorter machine cycle times and higher throughput.
The Sigma-7 platform also emphasizes improved efficiency and lower heat generation compared with earlier generations, which makes it easier to maintain temperature limits inside compact electrical cabinets or on tightly packed multi-axis machines.
3. High-Resolution 24-bit Encoder for Precise Control
A key characteristic of the SGM7A-10AFA61 is its built-in 24-bit serial incremental encoder. This resolution corresponds to over 16 million distinct positions per revolution, providing extremely fine feedback for both position and speed control.
For machine builders and integrators, this brings several advantages:
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High positioning accuracy: Very small commanded step sizes are possible, which is ideal for precision assembly, micro-movement in inspection systems, and fine indexing of rotary tables.
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Smooth low-speed motion: High feedback resolution reduces velocity ripple at low rpm, important for applications like slow inspection passes, coating, or welding.
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Simplified wiring: The serial encoder interface cuts down on wiring compared with older parallel encoders, improving noise immunity and easing routing in compact machines.
When paired with Sigma-7 servo drives, the encoder information is fully utilized by advanced tuning algorithms and vibration suppression functions, making it easier to achieve stable high-gain settings.
4. Mechanical Integration and Mounting
The SGM7A-10AFA61 uses a standard 80 mm flange dimension and 90 mm flange diameter, combined with a 19 mm keyed shaft. Yaskawa Europe These dimensions fit many common couplings, pulleys, and gearboxes used in small and medium industrial machines.
Important mechanical characteristics include:
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Compact housing: At roughly 162 mm in depth and 3.1 kg in mass, the motor offers a favorable torque-to-size ratio, making it easy to mount in crowded mechanical assemblies.
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Generous load inertia ratio: With an allowable load moment of inertia up to 20 times the motor’s inertia, designers can connect the motor to a wide variety of mechanical loads, from direct-drive screw shafts to geared rotary tables, without severe limitations.
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Flange compatibility: The Sigma-7 rotary motors are generally designed so that many frame sizes align with Sigma-5 mounting patterns, easing retrofit projects and upgrades in existing machines.
These attributes help reduce the mechanical design effort, particularly when migrating from older Yaskawa generations or when standardizing across multiple axes on one platform.
5. Electrical and Environmental Characteristics
The SGM7A-10AFA61 is a 200 V class, three-phase permanent magnet AC servo motor. Typical drive sets specify a rated line current of about 6.4 A at 1.0 kW output and 3000 rpm.
Additional electrical and environmental parameters include:
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Speed range: Rated at 3000 rpm with a maximum operating speed of 6000 rpm, enabling both high-speed axes and moderate-speed, high-torque duties through gearing.
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Insulation and protection: Insulation systems and withstand voltage ratings are designed for industrial environments, with typical specifications such as 1500 VAC for one minute and minimum insulation resistance of 10 MΩ at 500 VDC.
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Protection class: When assembled with suitable Sigma-7 rated connectors and cable glands, the motor body can achieve IP67, allowing operation in areas exposed to dust and washdown spray (within the stated limits).
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Ambient conditions: Standard operating range is 0–40 °C at full rating, with derating allowed up to 60 °C, and humidity from 20–80% RH non-condensing.
These characteristics make the SGM7A-10AFA61 suitable for a broad spectrum of industrial environments, from clean electronics plants to more demanding packaging or materials-handling lines.
6. Typical Applications and Use Cases
Because of its 1.0 kW rating, moderate torque, and low inertia, the SGM7A-10AFA61 is often selected for axes where both speed and responsiveness matter. Examples include:
| Application Area | Typical Axis or Function |
|---|---|
| CNC and machine tools | Tool changers, small rotary axes, workpiece positioning |
| Electronics assembly | Pick-and-place heads, small conveyors, loader/unloader axes |
| Packaging machinery | Feed rollers, sealing jaws, infeed or outfeed indexing axes |
| Printing & labeling | Registration rollers, label applicators, tension control |
| Inspection systems | Precise positioning tables, scanning motions for cameras |
| Light materials handling | Small gantry axes, shuttle systems, diverter mechanisms |
In each of these roles, the combination of 3.18 Nm rated torque and up to 11.1 Nm peak torque allows swift starts and stops without oversizing the motor, assuming the mechanical design and motion profiles are correctly engineered.
7. System Integration with Sigma-7 Servo Drives
The SGM7A-10AFA61 is designed to work seamlessly with Yaskawa Sigma-7 servo drives (servopacks). Matching motor and drive from the same family provides a number of system-level benefits:
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Optimized autotuning: Drive firmware includes dedicated parameters and identification routines for SGM7A motors, enabling quick startup and accurate gain setting.
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Advanced vibration suppression: Control algorithms can use the high-resolution encoder feedback to counteract mechanical resonances, especially useful in long or flexible mechanical structures.
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Flexible communications: Sigma-7 servo drives support a range of industrial networks (depending on model), so the same motor can be used in systems built around EtherCAT, Mechatrolink, PROFINET, or other modern fieldbuses.
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Safety and diagnostics: Many Sigma-7 drive models incorporate safety functions and detailed alarm diagnostics, simplifying compliance and maintenance at the machine level.
For OEMs and integrators, using the SGM7A-10AFA61 within a complete Sigma-7 ecosystem reduces engineering time and simplifies spare-parts logistics.
8. Selection and Sizing Considerations
When engineers choose the SGM7A-10AFA61 for a new axis or retrofit, they typically evaluate:
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Required continuous and peak torque: 3.18 Nm rated and 11.1 Nm peak cover a broad range of modest-to-medium torque tasks. For higher torque or heavier loads, another SGM7A frame or SGM7G series motor may be more appropriate.
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Load inertia and gearing: The motor’s allowable load inertia ratio of up to 20:1 offers a comfortable window for coupling to screws, belts, or gearboxes without compromising servo performance, provided that motion profiles are properly tuned.
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Available installation space: The 80 mm flange and compact 162 mm body simplify mounting inside small machines, panel-mounted axes, or retrofits where envelope dimensions are constrained.
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Thermal and environmental limits: Operating within specified temperature and humidity ranges and ensuring adequate cooling and environmental sealing will preserve long-term reliability.
By matching these parameters with the machine’s mechanical design and duty cycle, the SGM7A-10AFA61 can provide a long-life, low-maintenance motion solution.
9. Summary
The YASKAWA SGM7A-10AFA61 is a 1.0 kW, 200 V low-inertia AC servo motor that delivers a strong blend of compact size, responsive dynamics, and precise control. With 3.18 Nm rated torque, 11.1 Nm peak torque, speeds up to 6000 rpm, and a 24-bit serial incremental encoder, it is well suited to high-performance axes in CNC machines, packaging lines, electronics assembly equipment, and inspection systems.
When integrated with Sigma-7 servo drives, the SGM7A-10AFA61 offers fast tuning, reliable diagnostics, and outstanding motion quality, helping machine builders and end users achieve stable, repeatable performance in modern industrial automation applications.
