Yaskawa SGMGH-44ACA6E 4.4kW High-Inertia AC Servo Motor

Description

Product Introduction

The Yaskawa SGMGH-44ACA6E is a heavy-duty, high-inertia AC servo motor engineered for applications involving massive mechanical loads and high load-to-rotor inertia ratios. Operating within Yaskawa’s high-performance motion control ecosystem, this 4.4 kW motor provides exceptional smooth-running performance at low speeds and robust torque stability during aggressive cycle profiles.

Unlike low-inertia servo motors prone to mechanical resonance and speed hunting when coupled to heavy gearboxes or large belt drives, the SGMGH-44ACA6E’s high rotor inertia naturally dampens load oscillations. Paired with a compatible Yaskawa SERVOPACK (such as SGDH or SGDV series), it ensures precise tracking, minimal settling time, and reliable holding capability via its integrated 24V DC mechanical brake.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

It’s 3:15 AM on a heavy automotive stamping line. The main transfer axis drive faults out with an over-temperature or brake-release error, halting a 2,000-ton stamping press. The original motor’s internal brake coil has shorted out, locking the press slide mid-stroke. Retrofitting a non-standard motor frame requires custom adapter plates, new torque tuning, and costly downtime. You need an exact drop-in SGMGH-44ACA6E motor to bolt directly onto the heavy-duty gearbox, plug into the existing high-voltage power and brake harnesses, and resume production immediately.

• Metal Forming & Stamping Presses – Main Slide & Feed Drives – Handles extreme peak torque demands and heavy mechanical loads during high-impact stamping cycles.
• Injection Molding Machinery – Clamp & Injection Axes – Provides stable, high-torque velocity control for heavy mold-closing mechanisms.
• Large-Scale Gantry Robots – Heavy Material Handling – High inertia matches large axis masses to eliminate mechanical resonance and overshoot.

Field Case Study:

A Tier-1 automotive parts manufacturer in Michigan suffered a catastrophic bearing seizure on an SGMGH-44ACA6E motor driving a multi-ton conveyor indexing table. The plant faced thousands of dollars in hourly delay penalties. We dispatched a verified surplus SGMGH-44ACA6E unit via priority air freight. The maintenance crew swapped the motor, aligned the coupling, connected the heavy-duty power and brake lines, and successfully cleared all drive initialization faults within 45 minutes of receipt.

SGMGH-44ACA6E

SGMGH-44ACA6E

Transparency SOP: Quality Assurance & Testing

We test all heavy-duty servo motors on dedicated high-capacity load test benches before dispatch.

1. Inbound Physical Inspection: Thorough examination of the heavy-duty shaft, mounting flange integrity, connector pins, and housing paint for impact or corrosion.
2. Winding Resistance & Megohmmeter Audit: Measuring phase-to-phase stator winding resistance and running a 500V DC insulation resistance test to ensure zero ground leakage.
3. Brake Release & Voltage Test: Applying 24V DC directly to the integrated holding brake terminals to verify crisp mechanical release and engagement tolerances.
4. Closed-Loop Dynamometer Run: Coupling the motor to a Yaskawa SERVOPACK test rig to run full thermal and speed sweeps up to 1500 RPM under load.
5. Anti-Static & Heavy Industrial Packaging: Sealed in moisture-barrier bags and custom-cradled in heavy-duty foam crates designed for safe freight transit.

The Veteran’s Tech Trap Guide

⚠️ Never Release the Holding Brake with External Power During Installation:

The integrated 24V DC holding brake on the SGMGH-44ACA6E is designed strictly as a holding brake—not a dynamic stopping brake. Releasing it manually with an unmanaged external power source while a vertical load is hanging will cause the load to drop violently.

❗ Protect Heavy Connectors from Overtightening:

The high-capacity power and brake connectors on large SGMGH motors require careful alignment. Do not cross-thread the coupling rings or force them with pliers; damaged pins will compromise the IP67 seal and cause intermittent phase dropouts.

⚠️ Check Gearbox Backlash and Alignment:

High-inertia motors like the SGMGH-44ACA6E are frequently paired with heavy planetary or harmonic gearboxes. Always verify coaxial alignment using a dial indicator before final bolt torqueing to prevent premature bearing wear.

❗ Ensure Proper Grounding of Motor Shielding:

The high current switching from 4.4kW amplifiers generates significant EMI. Clamp the braided shield of the motor cable directly to the cabinet entry plate to prevent noise corruption on the encoder lines.

Frequently Asked Questions

Q: Is the SGMGH-44ACA6E compatible with both Sigma-II and Sigma-V amplifiers?

A: Yes, depending on the specific firmware version and encoder type configuration on your SERVOPACK, SGMGH motors are designed to integrate cleanly with compatible Yaskawa drive families. Always verify amplifier parameter settings for motor code matching.

Q: Can I remove the holding brake if my application does not require it?

A: No. The holding brake is built internally into the motor’s rear housing structure as an integrated mechanical assembly. You must order the correct base model suffix if a non-brake version is required.

Q: What is the primary difference between low-inertia (SGMPH/SGMPS) and high-inertia (SGMGH) motors?

A: High-inertia motors like the SGMGH feature a heavier rotor designed to match applications with large external load inertias, providing superior stability and damping against mechanical oscillation compared to lightweight, fast-accelerating low-inertia motors.

Q: How do I test if the internal holding brake is functioning correctly?

A: With the motor powered down, apply 24V DC to the brake leads; the shaft should turn freely by hand. Removing the voltage should immediately lock the shaft securely in place.

Q: What warranty is provided with this surplus motor?

A: Every Yaskawa SGMGH-44ACA6E unit we supply is backed by our full 12-month replacement warranty. If the unit experiences hardware failure under normal operating conditions during the warranty period, it is replaced directly from stock.