Description
SJ-DJ7.5/100-01 is a Mitsubishi Electric SJ-DJ series compact & lightweight CNC spindle motor designed for machining centers requiring fast spindle acceleration, compact size, and medium-duty cutting capability.
The SJ-DJ series is Mitsubishi’s lightweight spindle motor family optimized for compact CNC machines and rapid spindle response. (mitsubishielectric.com)
🔧 Key specifications (SJ-DJ7.5/100-01)
| Parameter | Value |
|---|---|
| Series | SJ-DJ |
| Type | Compact & lightweight AC spindle motor |
| Continuous rated output | 5.5 kW |
| Short-time rated output | 7.5 kW (25% ED) |
| Standard accel/decel output | 7.5 kW |
| Actual accel/decel output | 9.0 kW |
| Base speed | 1500 rpm |
| Maximum speed | 10,000 rpm |
| Continuous rated torque | 35.0 N·m |
| Frame number | A112 |
| Shaft diameter | Ø32 mm |
| Flange fitting diameter | Ø180 mm |
| Approx. mass | ~50 kg |
| Protection class | IP54 (shaft excluded) |
| Compatible spindle drive | MDS-DJ-SP-160 / MDS-EJ-SP-160 |
These specifications are listed in Mitsubishi’s official MDS-DJ / MDS-EJ spindle system manuals. (mitsubishielectric-cnc.com)
⚙️ What makes the SJ-DJ series different
Standard SJ-D
- Heavier conventional spindle motor
- Higher structural rigidity
- General machining applications
SJ-DJ
- Compact and lightweight
- Lower inertia rotor
- Faster spindle acceleration/deceleration
- Reduced machine weight
- Better suited for compact/high-speed machining centers
Mitsubishi officially categorizes SJ-DJ as a “Compact & lightweight spindle motor” family. (mitsubishielectric.com)
🧠 Code breakdown
| Code part | Meaning |
|---|---|
| SJ-DJ | Compact/lightweight spindle motor series |
| 7.5 | Power class |
| /100 | 100-frame spindle family |
| -01 | Mechanical/electrical specification revision |
🏭 Typical applications
Used in:
- compact machining centers
- vertical CNC mills
- drilling/tapping centers
- medium-duty milling applications
- production machines needing rapid spindle response
📐 Mechanical characteristics
- A112 frame structure
- Precision-balanced rotor
- Lower inertia than standard SJ-D motors
- Designed for continuous industrial spindle duty
- Optimized for compact machine tool layouts
⚠️ Important notes
- Not a servo positioning motor
- Not a linear motor
- Requires Mitsubishi spindle drive electronics
- Cooling and bearing maintenance are important at 10,000 rpm
- Must be paired with compatible Mitsubishi spindle amplifiers
🧠 Simple explanation
SJ-DJ7.5/100-01 is a compact and lightweight 7.5 kW-class CNC spindle motor designed for fast spindle response and medium-duty machining up to 10,000 rpm.