Mitsubishi M80 Spindle Motor 200V SJ-D5.5/120-01

SJ-D5.5/120-01 is a Mitsubishi Electric SJ-D series AC spindle motor used in CNC machine tools to drive the main spindle (cutting tool rotation).

🔧 Core identification

⚙️ What it does

This motor is used to:

• Rotate CNC machine spindles
• Drive cutting tools for:
  • milling
  • drilling
  • tapping
• Provide stable torque across a wide speed range

It is part of the machine’s rotary cutting system, not positioning or feed axes.

🧠 How to read the code

• SJ-D → spindle motor series
• 5.5 → rated output (5.5 kW)
• /120 → frame / design variant (higher capacity than 3.7 kW class)
• -01 → mechanical/electrical revision

📐 Typical characteristics

• Larger frame than SJ-D 3.7 kW class
• Higher torque capability for heavier cutting
• Precision-balanced rotor for low vibration at high RPM
• Designed for CNC machining centers and milling machines
• Integrated into spindle assembly via belt or direct-coupled design depending on machine

⚠️ Important notes

• Not a servo motor (does not handle axis positioning)
• Not a linear or torque motor
• Requires inverter/spindle drive control system
• Cooling and bearing condition are critical for high-speed operation

🧠 Simple explanation

SJ-D5.5/120-01 is a 5.5 kW CNC spindle motor that spins the cutting tool, designed for heavier machining than the 3.7 kW version.