Description
SJ-DL5.5/200-01T-S (Mitsubishi Electric)
SJ-DL5.5/200-01T-S is a Mitsubishi Electric SJ-DL series ultra-high-speed, low-inertia CNC spindle motor, designed for drilling and tapping machines where very high RPM + extremely fast acceleration/deceleration are the main requirement.
This exact model is officially listed in Mitsubishi spindle motor specifications.
🔧 Key specifications
| Parameter | Value |
|---|---|
| Series | SJ-DL (low inertia spindle) |
| Continuous rated output | 3.7 kW |
| Short-time rated output | 5.5 kW |
| Acceleration/deceleration output | 11 kW |
| Actual accel/decel output | 13.2 kW |
| Base speed | 2500 rpm |
| Maximum speed | 20,000 rpm |
| Continuous torque | 14.1 N·m |
| Motor inertia | 0.0046 kg·m² |
| Frame type | C90 class |
| Flange size | 174 mm square |
| Shaft diameter | Ø22 mm |
| Weight | ~28 kg |
| Protection | IP54 (shaft-through excluded) |
⚙️ What the code means
- SJ-DL → low-inertia / high-speed spindle motor series
- 5.5 → short-time power class (5.5 kW)
- /200 → high-speed variant (up to ~20,000 rpm class)
- 01 → standard design revision
- T → through-spindle (coolant/tool-through type)
- S → special hollow-shaft / structural variant (refined spindle version used in certain machine builds)
⚙️ What makes this motor special
This is one of the fastest-response spindle motors in Mitsubishi’s DL family:
- ⚡ Extremely low inertia → very fast acceleration
- 🔁 Designed for rapid cycle tapping/drilling
- 🎯 Stable operation up to 20,000 rpm
- 🧩 Hollow shaft design for coolant/tool-through machining
- ❌ Not meant for heavy rough cutting
🏭 Typical applications
- CNC tapping machines
- high-speed drilling centers
- light machining spindles
- mass-production machines with short cycle time
🧠 Simple explanation
SJ-DL5.5/200-01T-S is a 20,000 RPM ultra-high-speed CNC spindle motor designed for drilling and tapping, optimized for speed and responsiveness rather than cutting force.