Mitsubishi M80 High-output Specifications Motor SJ-DG5.5/120-04T

SJ-DG5.5/120-04T is a Mitsubishi Electric SJ-DG series high-output, high-torque spindle motor designed for CNC machine tools.

Unlike standard SJ-D motors, the SJ-DG series is optimized for higher acceleration/deceleration torque and stronger spindle dynamics.

🔧 Key specifications (SJ-DG5.5/120-04T)

These values are listed in Mitsubishi’s official CNC spindle specifications manual.

⚙️ What the “T” version means

The suffix “T” generally indicates a:

• through-spindle / hollow-shaft spindle configuration
• optimized spindle integration type
• commonly used with:
  • through-tool coolant systems
  • compact spindle cartridge assemblies
  • high-speed machining centers

🧠 How SJ-DG differs from standard SJ-D

Standard SJ-D

• General-purpose CNC spindle motor
• Balanced for efficiency + speed
• Standard cutting applications

SJ-DG

• Higher acceleration/deceleration capability
• Higher torque response
• Improved spindle dynamics
• Better suited for:
  • aggressive machining
  • rapid spindle response
  • high-performance CNC systems

Mitsubishi specifically notes improved torque acceleration/deceleration characteristics in the SJ-DG series.

⚙️ Typical applications

Used in:

• high-performance CNC machining centers
• mold machining
• precision milling systems
• high-speed spindle assemblies
• machines requiring rapid spindle acceleration

📐 Typical characteristics

• High-speed operation up to 12,000 rpm
• High dynamic torque response
• Precision-balanced spindle rotor
• Designed for continuous industrial duty
• Compatible with Mitsubishi MDS spindle drive systems

⚠️ Important notes

• Not a servo axis motor
• Not a linear motor
• Requires Mitsubishi CNC spindle drive system
• Usually integrated into precision spindle assemblies
• Cooling and bearing condition are critical at high RPM