Description
SJ-BG180D/150-01☐ (Mitsubishi Electric)
SJ-BG180D/150-01☐ is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, designed for heavy-duty CNC machining centers requiring:
- integrated spindle construction
- high rigidity and structural stiffness
- stable thermal behavior under continuous load
- strong cutting torque for heavy machining
- precision operation up to high-speed range
It belongs to the SJ-BG built-in spindle motor family, where the motor is directly integrated into the spindle housing (not belt-driven).
🔧 Model code breakdown
| Code section | Meaning |
|---|---|
| SJ | Mitsubishi spindle motor family |
| BG | Built-in spindle motor series |
| 180D | 180 mm frame, D-type high-rigidity variant |
| 150 | 15,000 rpm class |
| 01 | winding / standard design version |
| ☐ | OEM / machine-builder option code |
So:
SJ-BG180D/150-01☐ = 180 mm built-in spindle motor for ~15,000 rpm machining with high-rigidity D-type configuration
🔧 Verified specifications (SJ-BG180D/150 class)
From Mitsubishi SJ-BG series specification tables:
| Parameter | Value |
|---|---|
| Continuous rated output | 15 kW (low-speed coil class) |
| Short-time rated output | 26 kW (10–15% ED depending on drive) |
| Acceleration/deceleration output | 26 kW |
| Actual accel/decel output | 36 kW class |
| Maximum speed | 15,000 rpm |
| Continuous torque | ~71.6 N·m (class value) |
| Rotor inertia | ~0.018 kg·m² |
| Frame size | 180 mm class |
| Cooling | Liquid / oil jacket cooling |
| Structure | Built-in spindle motor |
⚙️ What makes the “180D” variant special
Within the SJ-BG180 family:
| Variant | Behavior |
|---|---|
| 180B | Balanced rigidity + speed |
| 180D | Higher rigidity + stronger cutting performance |
The D-type version is optimized for:
- heavier cutting loads
- improved spindle stiffness
- better thermal stability during long machining cycles
- more stable accuracy under aggressive cutting
⚙️ What “☐” means
The square symbol indicates:
OEM / machine-tool builder configuration option
It may define:
- encoder type
- bearing preload
- connector orientation
- balancing grade
- cooling or mounting variation
🏭 Typical applications
SJ-BG180D/150-01☐ is used in:
- heavy-duty CNC machining centers
- mold & die machining
- steel cutting / rough machining
- aerospace structural parts
- high-load precision milling
It is selected when machines require:
- ⚖️ high torque + stability
- 🧱 strong spindle rigidity
- 🎯 accurate machining under heavy load
- ⚡ integrated high-speed spindle performance
⚖️ Position in Mitsubishi spindle lineup
| Series | Role |
|---|---|
| SJ-V | General-purpose spindle motors |
| SJ-VL | Low-inertia drilling/tapping |
| SJ-DG | High-torque cutting spindles |
| SJ-DL | Ultra high-speed external spindles |
| SJ-BG | Built-in integrated spindle motors |
🧠 Simple explanation
SJ-BG180D/150-01☐ is a large built-in CNC spindle motor designed for 15,000 rpm class machining, optimized for heavy cutting, high rigidity, and stable industrial production performance.