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Phone: +86 16626708626Description
- Key Technical Specifications
| Parameter | Specification |
| Rated Output Power | 4.4 kW (5.9 HP) |
| Rated Speed | 1500 RPM |
| Maximum Speed | 3000 RPM |
| Rated Torque | 28.4 N·m (251 lb·in) |
| Peak Torque | 71.1 N·m (629 lb·in) |
| Rated Voltage / Current | 200 V AC / 32.8 A RMS |
| Rotor Inertia | 68.0 x 10⁻⁴ kg·m² (High Inertia) |
| Encoder Feedback | 17-bit (131,072 p/rev) Absolute Encoder (Code “A”) |
| Shaft Specification | Straight shaft with keyway and threaded center hole (Code “6”) |
| Design Revision / Options | Standard design (Code “C”), IP67 shaft oil seal fitted (Code “E”) |
| Holding Brake | Without holding brake |
| Compatible Servo Amplifier | Yaskawa SGDH-50AE or SGDV-330A11A (Sigma-II / Sigma-V) |
- Product Introduction
The Yaskawa SGMGH-44ACA6E is a 4.4 kW high-inertia AC servo motor from the legendary Sigma-II family, engineered for demanding industrial positioning applications. Delivering 28.4 N·m of continuous torque at 1500 RPM, it provides exceptional load-matching capability on high-inertia mechanical systems, reducing mechanical resonance and settling times on heavy-duty axes.
Equipped with a 17-bit absolute optical encoder and a factory-installed IP67 shaft oil seal, the SGMGH-44ACA6E maintains high positional accuracy and feedback integrity even in harsh machine environments exposed to oil spray and metal coolant. Machine builders and automation technicians rely on this motor for drive replacements in CNC machine tool axes, transfer lines, heavy gantries, and industrial stamping machinery.
SGMGH-44ACA6E
SGMGH-44ACA6E
- Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| Amplifier displays “A.10” (Overcurrent) or “A.C9” (Encoder Comms Error) | Phase short in motor winding or broken encoder signal conductor | ✅ High | Measure resistance phase-to-phase (U-V, V-W, W-U) and phase-to-ground with a Megger | Verify windings show balanced low milliohm resistance and >10 MΩ to ground. If winding is shorted or grounded, replace motor. |
| Motor vibrates excessively / Hums loudly during run | Servo loop gain too high for mechanical load or broken shaft coupling | ❌ Low | Perform auto-tuning or manual notch-filter adjustment in SigmaWin+ software | Run inertia estimation wizard in SigmaWin+. High rotor inertia requires proper load-to-motor inertia ratio (<5:1 recommended). |
| Absolute position lost on control reboot | Internal multi-turn encoder battery depleted in drive cable harness | ✅ High | Check 3.6V lithium battery voltage on encoder cable battery box | Replace 3.6 V encoder backup battery while drive power remains ON to retain absolute zero reference point. |
| Oil entering motor front flange / Encoder fault | Front shaft oil seal worn out allowing gearbox lubricant ingress | ✅ High | Unbolt motor flange and inspect shaft seal cavity for fluid contamination | Replace shaft oil seal immediately. If coolant has penetrated into the rear optical encoder housing, the motor assembly must be replaced. |
- Frequently Asked Questions (FAQ)
Q: What do the individual characters in the model number “SGMGH-44ACA6E” signify?
A: SGMGH: High-Inertia Sigma-II Motor; 44: 4.4 kW rated power; A: 200 V AC input winding; C: 17-bit absolute encoder; A: Standard design revision; 6: Straight shaft with keyway; E: IP67 oil seal installed (without holding brake).
Q: Can I drive the SGMGH-44ACA6E using a modern Sigma-V or Sigma-7 amplifier?
A: Yes. While originally designed for SGDH (Sigma-II) drives, you can operate this motor with a Sigma-V amplifier (SGDV-330A11A) using the appropriate converter feedback cable (JZSP-CMP09 series) and setting the parameter settings in SigmaWin+ to recognize legacy motor feedback.
Q: Is a holding brake included on this motor?
A: No. Code “E” at the end specifies an IP67 oil seal without an internal electro-mechanical holding brake. If your vertical axis requires a holding brake, you would need the “SGMGH-44ACA6C” or “SGMGH-44ACA61” variant (which includes a 24 V DC brake).
Q: What maintenance is required for the IP67 oil seal (Option Code E)?
A: The lip seal prevents external gearbox oil or coolant from penetrating the front motor bearing. Always lubricate the seal lip with synthetic grease prior to mounting into a gearbox flange, and inspect the seal for hardening or cracking during scheduled maintenance cycles.
Q: How do you test surplus or refurbished Yaskawa SGMGH servo motors before shipment?
A: Every unit passes a rigorous 5-step SOP quality inspection. We inspect mechanical keyways and housing threads, perform a 500 V Megger insulation test across phase windings, couple the motor to a genuine Yaskawa SGDH drive, verify 17-bit encoder count communication via SigmaWin+, and execute a continuous 24-hour dynamic load run prior to ESD and heavy-duty boxing.
