Mitsubishi M80 Spindle Motor 200V SJ-D5.5/120-02

SJ-D5.5/120-02 is a Mitsubishi Electric SJ-D series AC spindle motor, very close to the SJ-D5.5/120-01, but with a different mechanical/drive variant (revision “-02”) and reduced mass / modified characteristics for specific CNC configurations.

🔧 Key specifications (SJ-D5.5/120-02)

(Values from Mitsubishi official spindle motor specification tables)

⚙️ What is different vs SJ-D5.5/120-01

The “-02” suffix is not a new power class—it indicates a mechanical/structural variant used in different machine tool configurations.

Key differences:

• Lower mass (~24 kg vs heavier 120-01 variants)
• Same power class (5.5 kW short-time)
• Used with different spindle drive/mounting combinations
• “T-S” variants often used in hollow-shaft or special CNC spindle layouts

🧠 What it is used for

This motor is used as a CNC spindle drive motor, meaning it:

• Rotates the cutting tool spindle
• Handles machining operations like milling/drilling
• Works under high-speed, variable load conditions

Typical machines:

• Vertical machining centers
• Horizontal machining centers
• High-speed CNC milling systems

⚠️ Important notes

• Not a servo motor (no axis positioning role)
• Not a linear motor (no rail system)
• Requires Mitsubishi spindle drive (MDS series)
• Must be properly balanced for 10,000–12,000 rpm operation
• Version “-02” must match the correct drive unit combination (critical)

🧠 Simple explanation

SJ-D5.5/120-02 is a 5.5 kW CNC spindle motor, similar to the -01 version but with a different mechanical configuration and lower mass for specific machine designs.