Description
SJ-DL5.5/150-01T is a Mitsubishi Electric SJ-DL series low-inertia CNC spindle motor, designed for high-speed drilling and tapping machines where very fast acceleration/deceleration and high RPM are more important than cutting torque.
This is a verified SJ-DL model from Mitsubishi’s spindle motor lineup.
🔧 Key specifications (SJ-DL5.5/150-01T)
| Parameter | Value |
|---|---|
| Series | SJ-DL (Low inertia spindle motor) |
| Rated continuous output | 3.7 kW |
| Short-time rated output | 5.5 kW (15–25% ED depending on drive) |
| Acceleration/deceleration output | 11 kW class |
| Actual accel/decel output | 13.2 kW |
| Base speed | 2500 rpm |
| Maximum speed | 15,000 rpm |
| Frame class | C90 (150 frame family) |
| Continuous torque | 14.1 N·m |
| Motor inertia | 0.0046 kg·m² |
| Shaft diameter | ~Ø28 mm class |
| Flange size | ~Ø150 mm class |
| Cooling | Machine-integrated (no external fan) |
⚙️ What this motor is used for
This motor is designed for:
- CNC tapping machines
- high-speed drilling centers
- light machining spindles
- rapid cycle production machines
It is optimized for:
- ⚡ very fast spin-up / spin-down
- 🔁 frequent start-stop cycles
- 🎯 precision tapping at high RPM
🧠 What “150-01T” means
- /150 → medium-high speed spindle configuration (up to ~15,000 rpm class)
- 01 → standard design revision
- T → through-spindle / hollow shaft type (coolant/tool-through capability)
⚖️ Where it sits in the SJ-DL family
| Model | Focus |
|---|---|
| SJ-DL | Ultra-high-speed, low inertia spindles |
| SJ-DL5.5/150-01T | Balanced high-speed tapping/drilling |
| SJ-DL3.7/240-01T | Extreme high-speed (micro drilling / ultra fast response) |
🧠 Simple explanation
SJ-DL5.5/150-01T is a fast-response CNC spindle motor designed for drilling and tapping machines, capable of up to ~15,000 rpm with very low inertia for rapid cycling.