Original Genuine New AC Servo Motor YASKAWA SGM7A-01A6A61 Wonderful Performance for Industrial Application

In compact automation systems, the hardest job is often the smallest axis: low inertia mechanics, fast start-stop cycles, tight positioning tolerance, and zero patience for heat. The Yaskawa SGM7A-01A6A61 is built for exactly that kind of work. It is a Sigma-7 (SGM7A) rotary brushless AC servo motor designed for responsive motion, clean feedback, and practical mechanical integration in low-to-medium power applications. Yaskawa positions the SGM7A family as the “general-purpose workhorse” of the Sigma-7 line, emphasizing high power density at very low inertia and 24-bit encoder resolution for accurate positioning.

What makes SGM7A-01A6A61 especially appealing is the combination of 100 W class output, a 200 V input-class motor design, and a batteryless absolute encoder that avoids the nuisance of encoder battery maintenance while preserving absolute position information (useful after power cycles and during recovery routines). In real machines, that translates into quicker commissioning, less downtime risk, and more predictable homing/return-to-origin logic—particularly when you’re trying to squeeze high performance into a small mechanical envelope.

Performance character: fast response without bulk

Servo performance is not just about raw power; it is about how quickly the motor can change speed and torque without ringing the mechanics like a bell. This model is specified with a rated torque of 0.318 N·m and instantaneous maximum torque of 1.11 N·m, supporting short bursts for acceleration, indexing, and disturbance rejection. The rated motor speed is 3000 min⁻¹, with a maximum motor speed of 6000 min⁻¹, which is useful when your application needs either higher linear speeds (via a ballscrew pitch or belt ratio) or reduced gearbox ratio while keeping dynamic response sharp.

Yaskawa also publishes the motor moment of inertia for this specific unit, which is important for sizing and tuning: 0.0352 × 10⁻⁴ kg·m². Low inertia motors generally help reduce settling time and improve responsiveness in light-load axes. In practice, that can mean cleaner cornering in interpolation, tighter registration in web handling, or less overshoot in pick-and-place moves—assuming the load inertia, coupling stiffness, and servo tuning are handled sensibly.

Feedback and control: 24-bit resolution, batteryless absolute encoder

Encoder quality shows up everywhere: contour accuracy, low-speed smoothness, repeatability, and how confidently the drive can estimate velocity. The SGM7A-01A6A61 includes a 24-bit encoder and is listed as batteryless absolute. That combination is typically chosen when you want precise feedback without the maintenance overhead of replacing encoder batteries (and without the awkward “battery alarm at the worst time” ritual). It also makes machine recovery workflows more civilized, especially in multi-axis equipment where a power event would otherwise force re-homing and production scrap.

Mechanical integration: compact flange and keyed shaft interface

Mechanically, this motor is configured with a straight shaft with key and tap, which is a practical option for couplings, pulleys, and small gearheads where you want a secure torque transmission method. The published dimensions and interface data help during early-stage layout and retrofit work:

• Height: 55 mm

• Width: 39 mm

• Depth: 102 mm

• Flange dimension (LC): 39 mm

• Flange diameter (LA): 46 mm

• Shaft end diameter (S): 8 mm

• Shaft end length (Q): 25 mm

• Weight: 0.5 kg

At 0.5 kg, it’s also friendly to moving axes (gantries, rotary arms, small Z axes) where motor mass contributes directly to inertia and required acceleration torque.

Allowable inertia guidance: flexibility for real-world loads

Servo sizing frequently goes off the rails when load inertia is much larger than motor inertia, because the control loop has to “fight” more stored energy. Yaskawa lists an allowable load moment of inertia of 40 times for this model. That doesn’t mean you should always run at that edge—stiffness, backlash, resonance, and duty cycle still matter—but it does suggest the motor is intended to handle a reasonable range of reflected inertia without turning tuning into a dark art.

Where this motor fits best

Because it is a compact, low-inertia, 0.1 kW class Sigma-7 motor, SGM7A-01A6A61 is typically well matched to:

• Indexing and positioning axes in packaging and assembly equipment

• Small conveyors, rollers, feeders, and tension control where repeatability and low-speed smoothness matter

• Pick-and-place and light robotics sub-axes (end-of-arm tooling rotation, small linear slides)

• Lab automation and inspection stations, where compact footprint and predictable motion are valued

• Retrofitting Sigma-series systems, especially where mechanical envelope is fixed and performance needs an upgrade

Yaskawa highlights that the SGM7A series spans 50 W to 7 kW and is designed for “high rate of power at extremely low levels of inertia,” which is why this small frame size still behaves like a serious servo rather than a “motor that happens to spin.”

Drive compatibility and system-level notes

Servo motors are only half the system; the drive (SERVOPACK), feedback interface, and tuning features determine real performance. Yaskawa’s Sigma-7 rotary servomotors are supported by official manuals that cover selection, installation, wiring, and maintenance for Sigma-7-series AC servo drives and compatible motors. For engineering work, you generally want to validate:

• Correct drive family and capacity matching (torque/speed envelope and overload needs)

• Feedback and cable compatibility for the specific encoder option

• Application duty cycle (continuous torque, peak torque duration, ambient temperature)

• Mechanical coupling alignment and shaft load limits (to protect bearings and maintain accuracy)

Treat the published motor numbers as the starting point, then confirm the full combination (motor + drive + cable + regenerative handling) against your machine profile. That approach is boring—but it is the kind of boring that prevents commissioning week from becoming a horror anthology.

Key Specifications Table (SGM7A-01A6A61)

Summary

Yaskawa SGM7A-01A6A61 is a compact Sigma-7 rotary servo motor designed to deliver crisp motion control in small axes: 0.1 kW output, 200 V class, 24-bit batteryless absolute encoder, and a torque/speed profile suited to fast, repeatable positioning. Its mechanical dimensions and keyed shaft configuration support straightforward integration into compact machines, while the published inertia and allowable inertia ratio provide practical guidance for sizing and tuning in real applications.