Mitsubishi M80 Spindle Motor 200V SJ-D3.7/100-01

SJ-D3.7/100-01 is a Mitsubishi Electric AC spindle motor (SJ-D series) used mainly in CNC machine tools as the main cutting spindle drive motor.

🔧 Basic identification

(Source: Mitsubishi SJ-D spindle motor specification manuals)

⚙️ What it is used for

This motor is not a servo or linear motor. It is a spindle motor, meaning:

• Drives the main rotating tool spindle in CNC machines
• Used for:
  • milling
  • drilling
  • machining centers
• Designed for high-speed rotation under load

📐 Physical / machine characteristics

Typical features from Mitsubishi SJ-D series data:

• Frame size: ~174 mm flange square
• Shaft diameter: ~28 mm
• Compact cylindrical spindle motor housing
• Designed to couple directly to machine spindle via taper or belt system depending on machine design

⚡ Performance behavior

• Continuous operation around 3.7 kW
• Short bursts up to 5.5 kW
• Designed for:
  • high-speed spindle rotation (up to 10,000 RPM)
  • stable torque at mid speeds
• Optimized for CNC cutting stability rather than positioning accuracy

🧠 Simple explanation

SJ-D3.7/100-01 = a 3.7 kW CNC spindle motor that spins the machine tool at up to 10,000 RPM.

It is part of the rotary cutting system, unlike:

• LM-F series → linear motion motors
• TM-RB series → rotary direct-drive torque motors