Mitsubishi M80 Built-IN Spindle Motor SJ-2B6706TK

🔧 Mitsubishi SJ-2B6706TK – Description

The SJ-2B6706TK is a Mitsubishi Electric SJ-B Series built-in spindle motor, used in CNC machine tools for high-power spindle applications.

It is designed as a high-torque, dual-coil (low-speed / high-speed) motor integrated inside the spindle structure for compact and rigid machine design.

⚙️ Key Description

• Series: SJ-B Built-in Spindle Motor
• Type: Dual-coil built-in spindle motor (low-speed & high-speed winding)
• Application: CNC machining centers, milling machines, heavy-duty spindle drives
• Drive compatibility: MDS-D2-SP-400 spindle drive unit

⚡ Functional Characteristics

• Provides two-speed coil operation:
  • Low-speed coil → high torque cutting operations
  • High-speed coil → finishing / high RPM machining
• Designed for:
  • Heavy cutting load machining
  • High rigidity spindle integration
  • Continuous industrial CNC operation

📊 Performance Overview (typical for this model)

• Power output:
  • Continuous: ~15 kW
  • 30-min rating: ~18.5 kW
• Torque:
  • Continuous: ~318 N·m (low-speed coil)
  • Short-time: ~393 N·m
• Speed range:
  • Up to ~6000 r/min (high-speed coil)
  • Low-speed operation for high torque cutting

🧩 Mechanical & Cooling Features

• Built-in stator/rotor spindle design (not external motor)
• Requires liquid cooling (oil cooling jacket system)
• Heavy-duty construction:
  • High inertia rotor
  • Industrial-grade bearing support
• Designed for high rigidity machine spindles

🏭 Typical Use Case

The SJ-2B6706TK is typically found in:

• CNC machining centers (3-axis / 4-axis / vertical mills)
• Heavy metal cutting machines
• High-load industrial production equipment