Description
In Mitsubishi CNC systems (especially MDS-E / MDS-EM / MDS-EJ / SPV3 platforms), HG903 typically refers to:
A very high-power HG-series AC servo motor, usually equivalent to a large-frame HG354-class or custom heavy-duty variant.
⚙️ Practical interpretation (field service view)
HG903 is generally treated as:
- HG-series feed-axis servo motor (AC brushless)
- High torque / high inertia class
- Likely 3.5 kW class or higher equivalent (system-dependent)
- Used for large CNC machine tool axes
🏭 Typical applications
- Large machining centers
- Heavy-duty milling / boring machines
- Large X/Y/Z axis feed drives
- High cutting-force industrial CNC systems
- OEM-custom Mitsubishi CNC machine tools
📊 Why HG903 is not a standard HG code
Mitsubishi official HG naming is structured by power class:
- HG54 → ~0.5 kW
- HG75 → 0.75 kW
- HG104 / HG105 → ~1.0 kW
- HG154 → 1.5 kW
- HG204 / HG224 → 2.0–2.2 kW
- HG354 → 3.5 kW (top standard class)
👉 “903” does not match this scheme, so it is likely:
- OEM machine tool builder code
- Internal configuration identifier
- Or bundled motor + winding + encoder variant code
📌 Simple Meaning
HG903 =
OEM/legacy designation for a very high-power Mitsubishi HG-series servo motor, typically equivalent to HG354-class or higher, used in heavy-duty CNC machine tool axes.