High Performance Genuine New Sigma-7 Rotary Servo Motor YASKAWA SGM7A-02A6A6E Good Controlling for Industry

The Yaskawa SGM7A-02A6A6E is a Sigma-7 (SGM7A) brushless rotary AC servomotor built for fast, precise motion in compact machinery. It sits in the “general-purpose workhorse” class of the Sigma-7 lineup, meaning it is designed to cover a wide range of light-to-medium duty axes without forcing you into oversized frames or excessive heat. Yaskawa positions the SGM7A family as low inertia, high-speed motors with 24-bit encoder resolution and tight control behavior across many machine types.

What makes SGM7A-02A6A6E especially practical is the combination of a keyed, tapped shaft plus two reliability-oriented options: an oil seal and a 24 VDC holding brake. In the real world, that combination maps neatly to axes that must hold position safely when power is removed (vertical loads, suspended tooling, lift modules) and machines that operate near lubricated mechanisms or mild contamination (gearboxes, greased couplings, dust-prone packaging lines).

Why this exact variant matters (keyed shaft + oil seal + holding brake)

1) Straight shaft with key and tap: coupling confidence under repeated reversals

This motor’s shaft end is specified as “Straight with key and tap.” Compared with a smooth, keyless shaft variant, a keyed/tapped interface is often chosen when you want added mechanical security against micro-slip under frequent reversing, quick acceleration, or periodic shock loads (for example, indexing tables, pick-and-place rotary axes, short-stroke screw actuators, or compact belt drives). It also makes many common hubs, pulleys, and coupler styles easier to standardize across builds.

2) Oil seal: more tolerant around lubrication and light contaminants

SGM7A-02A6A6E includes an oil seal option. This is not just a checkbox feature: it’s a design choice that can reduce risk in machines where grease, oil mist, or fine particulate can migrate toward the shaft area over time. It helps in applications like gearmotor-adjacent designs, enclosed drive modules, and packaging equipment where cleaning and lubrication cycles are routine.

3) Holding brake (24 VDC): for holding, not for dynamic stopping

The holding brake is a major reason engineers select this “E” option set. It’s meant to hold the shaft when the servo is stopped—especially important for vertical axes—rather than to act as a service brake during motion. Yaskawa’s rotary servomotor manual is explicit: the holding brake cannot be used to stop the servomotor, and it is not designed as a stopping device for machine safety—a separate stopping method should be provided at the machine level.
Also, the manual notes that the 24 VDC brake power supply is not provided by Yaskawa, so system design must include a suitable supply and wiring strategy.

Performance profile: fast motion in a compact 200 W frame

From the Yaskawa Europe product specification, this motor is a 200 V class, 0.2 kW servomotor with a torque/speed envelope well suited to high-cadence automation:

• Rated torque: 0.637 N·m

• Instantaneous maximum torque: 2.23 N·m

• Rated speed: 3000 min⁻¹

• Maximum speed: 6000 min⁻¹

The inertia numbers are equally important when you’re trying to make an axis feel “sharp” without introducing vibration:

• Motor moment of inertia: 0.14 × 10⁻⁴ kg·m²

• Allowable load moment of inertia: 30×

In practical tuning terms, this is a motor that behaves nicely on low-to-moderate inertia loads and can still deliver short bursts of torque for acceleration, settling, and disturbance rejection.

Feedback and control: 24-bit batteryless absolute encoder

SGM7A-02A6A6E uses a 24-bit encoder with batteryless absolute type feedback. This matters for uptime and repeatability because it supports accurate positioning without the maintenance overhead of replacing encoder batteries, and it improves machine recovery behavior after power interruption (depending on the drive and system configuration).

Thermal and mechanical efficiency features (Sigma-7 design intent)

Yaskawa describes SGM7A motors as compact, efficient, and designed to reduce ripple effects that show up as vibration or surface marks in precision processes. In the SGM7A series highlights, Yaskawa emphasizes:

• Neodymium iron boron magnets to reduce rotor size

• Low cogging torque via magnetic and winding optimization

• More compact packaging for tight installation spaces

• SIL 3 safety rating (IEC 61508) (series-level statement)

• IP67 rating for dust/washdown resistance (series-level statement)

• Holding brake and shaft seal options available (which this model uses)

On the Yaskawa Europe product page for this model, the overview also calls out high efficiency, low heat generation, and downsizing by up to 20%, plus flange compatibility with Sigma-5, which helps during retrofits or mechanical standardization.

Typical applications for SGM7A-02A6A6E

Because of the keyed/tapped shaft, oil seal, and holding brake, this motor is commonly chosen for:

• Vertical Z-axes (pick-and-place, palletizing submodules, lift tables, tool changers)

• Screw-driven linear stages where the brake prevents back-driving when stopped

• Indexing and rotary tooling with frequent reversing and short cycle times

• Packaging machinery (cartoning, labeling, sealing, inspection stations)

• General automation where compact size and fast response improve throughput

Technical Specifications Table (SGM7A-02A6A6E)

Implementation note (important for brake variants)

If you choose this model primarily for the holding brake, build your motion sequence so the axis decelerates to stop before the brake engages. Yaskawa warns against using the motor’s holding brake as a stopping device and recommends a proper machine-level stopping method for safety. This is one of those details that quietly determines whether an axis feels solid for years—or becomes a recurring service ticket.