Description
SJ-BG240H/100-01☐ (Mitsubishi Electric)
SJ-BG240H/100-01☐ is a Mitsubishi Electric SJ-BG series built-in AC spindle motor, designed for very heavy-duty CNC machining centers requiring:
- high torque at low speed
- very high structural rigidity
- stable thermal performance under heavy cutting
- integrated spindle construction (motor built into spindle housing)
- optimized for roughing + heavy machining operations
It is one of the largest-frame BG built-in spindle motors, intended for machines where cutting power matters more than ultra-high RPM.
🔧 Model code breakdown
| Code section | Meaning |
|---|---|
| SJ | Mitsubishi spindle motor family |
| BG | Built-in spindle motor series |
| 240H | 240 mm frame, H-type highest-output variant |
| 100 | 10,000 rpm class |
| 01 | design/winding version |
| ☐ | OEM / machine-builder configuration option |
So:
SJ-BG240H/100-01☐ = 240 mm built-in spindle motor designed for ~10,000 rpm heavy-duty machining
🔧 Verified specifications (SJ-BG240H/100 class)
From Mitsubishi official SJ-BG specification data:
| Parameter | Value |
|---|---|
| Series | SJ-BG |
| Motor type | Built-in AC spindle motor |
| Continuous rated output | 18.5 kW / 26 kW (coil-dependent) |
| Short-time rated output | 30 kW / 45 kW (ED dependent) |
| Acceleration/deceleration output | 30–45 kW |
| Actual accel/decel output | 36–54 kW |
| Base speed | 700 rpm / 2500 rpm (coil dependent) |
| Maximum speed | 10,000 rpm (high-speed coil) |
| Continuous torque | 252 N·m / 99.3 N·m (coil dependent) |
| Rotor inertia | 0.14 kg·m² |
| Frame diameter | ~239.5 mm stator OD class |
| Cooling | Liquid / oil jacket cooling |
| Mass (approx.) | Stator ~63 kg, Rotor ~32 kg |
⚙️ What makes the “240H” variant special
Within the SJ-BG240 family:
| Variant | Character |
|---|---|
| 240A/B (if used in some catalogs) | lighter / balanced versions |
| 240H | highest torque + heavy-duty machining class |
The H-type (High-output) is designed for:
- maximum cutting force capability
- heavy rough machining of steel and cast iron
- very stable low-speed torque performance
- long-duration cutting under load
Compared with smaller BG motors:
- 🧱 much higher rigidity
- ⚙️ significantly higher torque output
- 🔩 optimized for roughing rather than high RPM finishing
⚙️ What “100” means
- 100 = spindle speed class (≈ 10,000 rpm max system design)
- lower than 150/200/300-class BG motors
- but much stronger in torque and load capacity
So:
240H/100 = heavy cutting spindle optimized for 10k rpm class machining
⚙️ What “☐” means
The square symbol indicates:
OEM / machine-tool builder-specific configuration
This can include:
- encoder type
- bearing preload
- shaft interface
- balancing grade
- cooling or connector variations
🏭 Typical applications
SJ-BG240H/100-01☐ is used in:
- large CNC machining centers
- heavy mold & die machining
- steel and cast iron roughing
- aerospace structural machining
- high-load production machining systems
It is chosen when machines need:
- ⚖️ extremely high cutting torque
- 🧱 maximum spindle rigidity
- 🎯 stable machining under heavy loads
- ⚡ strong integrated spindle construction
⚖️ Position in Mitsubishi spindle lineup
| Series | Role |
|---|---|
| SJ-V | general spindle motors |
| SJ-VL | high-speed low-inertia |
| SJ-DG | high-torque cutting spindles |
| SJ-DL | ultra high-speed external spindles |
| SJ-BG | built-in integrated spindle motors |
🧠 Simple explanation
SJ-BG240H/100-01☐ is a large-frame built-in CNC spindle motor designed for 10,000 rpm class operation, optimized for maximum torque, rigidity, and heavy-duty cutting applications.