Original Brand New AC Servo Motor YASKAWA SGM7A-08AFA61High Performance for Industrial Control

The YASKAWA SGM7A-08AFA61 is a 0.75 kW rotary servo motor in the Sigma-7 family, built for fast, repeatable positioning in compact industrial machinery. It combines low rotor inertia, a 24-bit high-resolution incremental encoder, and a robust mechanical package that matches the mounting pattern of many earlier Sigma-5 motors, making it suitable for both new designs and upgrade projects. 

1. Main Specifications

These values are taken from Yaskawa European product data and established distributor specifications for the SGM7A-08AFA61. 

2. Performance and Control Characteristics

The SGM7A-08AFA61 sits in the lower mid-power range of the Sigma-7 platform and is aimed at axes where quick response and compact installation are more important than very high continuous torque. The 0.75 kW rating, combined with 2.39 Nm rated torque and up to 8.36 Nm peak torque, provides a comfortable margin for fast indexing, frequent start/stop cycles, and short stroke motions.

With a rated speed of 3000 rpm and a maximum speed of 6000 rpm, the motor can support both moderate-speed, higher-torque duties (for example, through mechanical reduction) and high-speed axes such as feed rollers or small conveyor sections. The relatively low rotor inertia (0.775 × 10⁻⁴ kg·m²) allows high servo gains and rapid acceleration when paired with an appropriately sized load. 

This low-inertia characteristic is one of the core design goals of the SGM7A series: the motor can follow demanding motion profiles closely without oversizing the drive or gearbox, reducing total system cost and cabinet space. 

3. High-Resolution 24-bit Encoder

The built-in 24-bit serial incremental encoder offers over 16 million counts per revolution, giving very fine position and speed feedback. 

In practice, this provides several benefits:

• Accurate positioning: Fine feedback allows small commanded moves and tight positioning tolerances in assembly, test, and inspection systems.

• Smooth low-speed operation: High resolution reduces velocity ripple at low speeds, which is important for processes like visual inspection, metering, or slow synchronized motion.

• Simplified wiring: The serial encoder interface reduces the number of conductors compared to older parallel encoders, improving noise immunity and making routing easier inside compact machines.

When the SGM7A-08AFA61 is paired with a Sigma-7 servopack, the drive uses this high-resolution feedback for advanced autotuning, vibration suppression, and resonance rejection functions, helping achieve stable, high-performance motion with minimal manual tuning effort. 

4. Mechanical Design and Installation

Mechanically, the SGM7A-08AFA61 is designed to fit into small to mid-size machines:

• 80 mm flange size and 90 mm flange diameter make it compatible with many standard gearboxes and mounting plates used in 750 W servo applications.

• The 94.7 × 80 × 137 mm outline and 2.3 kg weight give a good torque-to-size ratio and make multi-axis layouts easier in restricted spaces. 

• The straight shaft with key and tapped center simplifies coupling to pulleys, flexible couplings, or direct-coupled screw shafts. 

The allowable load inertia of up to 20 times the motor’s own inertia gives system designers generous flexibility. It is possible to drive moderate-inertia loads directly (such as compact rotary tables or belt axes) without resorting to high reduction ratios, provided that the motion profile and tuning are engineered correctly. 

Because the SGM7A series maintains flange compatibility with many Sigma-5 motors of the same frame size, the SGM7A-08AFA61 is also a practical drop-in option for upgrading older equipment to Sigma-7 performance while reusing much of the existing mechanics. 

5. Electrical Characteristics and Operating Conditions

The SGM7A-08AFA61 is a three-phase 200 V AC permanent magnet servo motor. It is intended to operate with Sigma-7 servo drives that are matched to its voltage and feedback system. 

Key electrical and environmental points include:

• Rated output and torque: 0.75 kW at 3000 rpm with 2.39 Nm rated torque support a broad range of light-to-medium duty axes. 

• Speed range: 3000 rpm rated and 6000 rpm maximum speed allow both high-speed and geared applications on the same platform. 

• Encoder interface: 24-bit serial incremental feedback matches Sigma-7 drive technology and is standard on the motor, simplifying configuration. 

Standard operating temperature and humidity ranges for the Sigma-7 series are structured around typical industrial environments; within these limits, the SGM7A-08AFA61 is designed for long service life with minimal maintenance when correctly installed and cooled.

6. Typical Applications

Because of its power level, mechanical size, and low inertia, the YASKAWA SGM7A-08AFA61 is a good fit in many motion axes where both responsiveness and compactness are important.

In these roles, the combination of 2.39 Nm continuous torque, 8.36 Nm peak, and low rotor inertia helps achieve short cycle times while keeping the motor frame small and easy to integrate. 

7. Integration with Sigma-7 Servo Drives

The SGM7A-08AFA61 is intended to be used with Sigma-7 servopacks (servo drives) from Yaskawa. A matched motor-and-drive set offers several system-level advantages:

• Drive firmware includes parameter sets and autotuning routines specifically aligned with SGM7A motors, reducing commissioning time. 

• Advanced control functions such as vibration suppression, notch filters, and real-time monitoring use the high-resolution encoder data to optimize axis performance.

• Sigma-7 drives support a range of industrial communication networks (model-dependent), allowing the same SGM7A-08AFA61 motor to be used in systems built around EtherCAT, MECHATROLINK, PROFINET, and other common motion buses. 

This tight integration simplifies both new machine projects and retrofits where designers want to modernize control technology while keeping mechanical changes to a minimum.

8. Engineering and Sizing Notes

When selecting the SGM7A-08AFA61 for a project, engineers typically consider:

• Torque and duty cycle: 0.75 kW and 2.39 Nm rated torque are well suited to light and medium mechanical loads; applications that require substantially higher continuous torque may be better served by a larger SGM7A or SGM7G frame.

• Load inertia: The allowable load inertia ratio of up to 20:1 gives flexibility, but drive tuning and motion profiles should be checked carefully when approaching this limit. 

• Space envelope: The 80 mm flange, 90 mm flange diameter, and 137 mm depth should be confirmed against the mechanical layout, especially in multi-axis systems or compact enclosures. 

With correct mechanical sizing, thermal considerations, and drive parameterization, the SGM7A-08AFA61 can deliver stable, low-maintenance performance over a long service life.

9. Conclusion

The YASKAWA SGM7A-08AFA61 is a 0.75 kW, low-inertia Sigma-7 rotary servo motor that brings together high-resolution 24-bit feedback, compact dimensions, and a wide operating speed range. Its 2.39 Nm rated torque, 8.36 Nm peak torque, and 3000/6000 rpm speed capability make it a versatile choice for many small and medium motion axes in packaging, electronics, machine tools, and inspection equipment. 

Used together with Sigma-7 servo drives, the SGM7A-08AFA61 forms a modern, high-performance motion solution that supports precise positioning, fast cycle times, and flexible integration into advanced industrial automation systems.