SJ-BG090A/300-01 (R) (Mitsubishi Electric)

SJ-BG090A/300-01 (R) is a Mitsubishi Electric SJ-BG series built-in spindle motor, designed for high-speed precision CNC machine spindles where the motor is integrated directly into the spindle structure.

Unlike standard external spindle motors (SJ-V, SJ-DG, etc.), the SJ-BG series is a built-in motor type, typically used in:

• precision machining centers
• grinding machines
• high-speed milling spindles
• compact integrated spindle units

🔧 Model code breakdown

So:

SJ-BG090A/300-01(R) = compact built-in spindle motor for ~30,000 rpm high-speed machining applications

🔧 Typical specifications (BG090A/300 class)

Based on Mitsubishi SJ-BG spindle family characteristics: (mitsubishielectric.com)

⚙️ What makes BG series special

Compared with standard spindle motors:

Advantages of BG:

• ⚡ higher maximum RPM
• 📉 lower vibration
• 🎯 better spindle accuracy
• 🧱 more compact spindle assembly
• 🔇 quieter operation

🏭 Typical applications

SJ-BG090A/300-01(R) is commonly used in:

• high-speed milling spindles
• graphite machining
• mold & die machining
• PCB drilling machines
• precision grinding machines
• compact machining centers

🧠 Simple explanation

SJ-BG090A/300-01(R) is a compact built-in CNC spindle motor designed for very high-speed precision machining around the 30,000 rpm class.