Description
SJ-BG180B/150-01 (R) (Mitsubishi Electric)
SJ-BG180B/150-01 (R) is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, designed for heavy-duty CNC machining centers requiring:
- integrated spindle motor construction
- high rigidity and thermal stability
- strong cutting torque (low–mid speed range)
- stable precision machining under load
It belongs to the SJ-BG built-in spindle family, where the motor is directly built into the spindle structure (not belt-driven or external).
🔧 Model code breakdown
| Code part | Meaning |
|---|---|
| SJ | Mitsubishi spindle motor family |
| BG | Built-in spindle motor series |
| 180B | 180 mm frame, B-type structural variant |
| 150 | 15,000 rpm class |
| 01 | winding / design version |
| (R) | revised rotor / OEM configuration variant |
So:
SJ-BG180B/150-01(R) = 180 mm built-in spindle motor for ~15,000 rpm machining with B-type configuration
⚙️ Key technical data (official class values)
From Mitsubishi SJ-BG specification tables:
| Parameter | Value |
|---|---|
| Continuous rated output | 11 kW (low-speed coil) / 18.5 kW (high-speed coil) |
| Short-time rated output | 18.5 kW / 30 kW |
| Acceleration/deceleration output | 18.5 kW / 30 kW |
| Actual accel/decel output | 22.2 kW / 36 kW |
| Max speed | 15,000 rpm |
| Base speed | ~2300 rpm (low-speed coil) |
| Frame size | φ179.5 mm stator OD class |
| Rotor inertia | ~0.012 kg·m² |
| Cooling | Liquid / oil jacket cooling |
| Structure | Built-in spindle motor |
⚙️ What “B type” means (180B)
Within the SJ-BG180 family:
- B type = balanced design (mid rigidity, mid inertia)
- positioned between lighter and heavier variants
Compared to D and F versions:
- more balanced acceleration
- moderate torque
- good general machining performance
⚙️ What “(R)” means
The (R) suffix indicates:
- revised rotor design or balancing grade
- OEM / machine-builder specific configuration
- not a different power class
🏭 Typical applications
SJ-BG180B/150-01(R) is used in:
- CNC machining centers (general + medium-heavy duty)
- mold & die machining
- precision milling
- continuous production machining lines
It is chosen when machines need:
- ⚖️ balance of torque and speed
- 🧱 good rigidity for medium-heavy cutting
- 🎯 stable machining accuracy under load
- ⚡ integrated high-speed spindle performance
⚖️ Position in Mitsubishi spindle lineup
| Series | Role |
|---|---|
| SJ-V | General-purpose external spindle motors |
| SJ-VL | High-speed low-inertia spindles |
| SJ-DG | High-torque cutting spindles |
| SJ-DL | Ultra high-speed external spindles |
| SJ-BG | Built-in integrated spindle motors |
🧠 Simple explanation
SJ-BG180B/150-01(R) is a built-in CNC spindle motor designed for 15,000 rpm class machining centers, offering a balanced combination of rigidity, torque, and speed for general heavy-duty machining.