Description
SJ-DG11/100-03T is a Mitsubishi Electric SJ-DG series high-output, high-torque CNC spindle motor designed for aggressive machining applications requiring strong acceleration/deceleration performance and high spindle rigidity.
It belongs to Mitsubishi’s SJ-DG high-dynamic spindle family, which improves torque response compared with the standard SJ-D series.
🔧 Key specifications (SJ-DG11/100-03T)
| Parameter | Value |
|---|---|
| Series | SJ-DG |
| Type | High-output AC spindle motor |
| Continuous rated output | 7.5 kW |
| Short-time rated output | 15 kW (25% ED) |
| Standard accel/decel output | 15 kW |
| Actual accel/decel output | 18 kW |
| Base speed | 1500 rpm |
| Maximum speed | 10,000 rpm |
| Continuous rated torque | 47.7 N·m |
| Frame number | B112 |
| Compatible spindle drive | MDS-D2-SP-200 |
| Shaft diameter | Ø48 mm |
| Flange size | 204 mm square |
| Total motor length | 489 mm |
| Approx. mass | 61 kg |
| Protection class | IP54 (shaft portion excluded) |
| Heat resistance class | Class F (155°C) |
These specifications are listed in Mitsubishi’s official MDS spindle system manuals.
⚙️ What the “03T” means
| Code part | Meaning |
|---|---|
| SJ-DG | High-output / high-torque spindle motor series |
| 11 | Power class |
| /100 | 100-frame spindle family |
| 03 | Mechanical/electrical specification revision |
| T | Through-spindle / hollow-shaft compatible configuration |
The “T” type is generally used in:
- through-tool coolant spindle systems
- compact spindle cartridge assemblies
- high-speed machining centers
⚙️ How SJ-DG differs from standard SJ-D
Standard SJ-D
- General CNC spindle motor
- Optimized for balanced efficiency and cutting
- Conventional machining applications
SJ-DG
- Higher acceleration/deceleration capability
- Stronger transient torque
- Faster spindle response
- Better suited for:
- aggressive roughing
- rapid spindle speed changes
- high-performance machining centers
Mitsubishi specifically notes improved “output and torque acceleration/deceleration characteristics” for the SJ-DG series.
🏭 Typical applications
Used in:
- high-performance machining centers
- mold & die machining
- precision milling systems
- production CNC systems needing rapid spindle acceleration
- heavy/high-speed cutting operations
⚠️ Important notes
- Not a positioning servo motor
- Not a linear motor
- Requires Mitsubishi MDS spindle drive electronics
- Cooling and bearing maintenance are critical at 10,000 rpm
- Must be matched correctly with Mitsubishi spindle amplifier systems
🧠 Simple explanation
SJ-DG11/100-03T is a high-dynamic CNC spindle motor capable of 15 kW short-time output and 10,000 rpm operation, designed for aggressive machining with strong acceleration and high cutting torque.