Mitsubishi M80 Spindle Motor 200V SJ-D5.5/100-01

SJ-D3.7/100-01 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 the CNC spindle shaft
• Drive cutting tools for:
  • milling
  • drilling
  • boring
• Provide stable torque at varying speeds

Unlike servo or linear motors, it is designed for continuous rotation under machining load, not positioning.

🧠 How to read the code

• SJ-D → spindle motor series
• 3.7 → rated power (3.7 kW)
• /100 → frame / design speed class
• -01 → design variant / mounting configuration

📐 Typical characteristics

• Compact cylindrical motor body
• High-speed rotor optimized for low vibration
• Precision-balanced for machining stability
• Designed for integration into CNC spindle assemblies
• IP-rated housing (machine-enclosed use)

⚠️ Important notes

• Not a servo motor (no positioning control role)
• Not a linear motor (no rail/coil system)
• Works only as part of a spindle drive system with inverter/servo amplifier
• Requires proper cooling and balancing for high RPM operation

🧠 Simple explanation

SJ-D3.7/100-01 is a 3.7 kW CNC spindle motor that spins the cutting tool at high speed (up to ~10,000 rpm).