Description
The Mitsubishi SJ-4-V7.5-12T is a 7.5 kW AC spindle motor from Mitsubishi Electric’s SJ-4-V series, used in CNC machine tool spindle drives (milling and turning machines).
Key Specifications (SJ-4-V7.5-12T)
| Specification | Value |
|---|---|
| Series | SJ-4-V Series |
| Motor Type | AC Spindle Motor |
| Rated Output | 7.5 kW (30-min rating) |
| Continuous Output | ~5.5 kW |
| Rated Torque | 35 N·m |
| Base Speed | 1500 rpm |
| Maximum Speed | 10,000–12,000 rpm (system dependent) |
| Frame Size | 204 SQ class |
| Flange Size | 180 mm |
| Shaft Diameter | 32 mm |
| Mass | ~60 kg |
| Protection Class | IP44 |
| Encoder | Absolute encoder (built-in) |
| Cooling | Self-cooled / fan-assisted depending on setup |
| Drive Compatibility | Mitsubishi MDS-D / MDS-DH spindle amplifiers |
📌 Source: Mitsubishi Electric SJ-4-V series spindle motor specification tables (mitsubishielectric.com)
Features
- Designed for CNC spindle rotation (not axis servo motor)
- High short-time power output (7.5 kW) for heavy cutting
- Stable torque delivery for machining loads
- High-speed capability up to ~10,000–12,000 rpm
- Built-in encoder for precise spindle feedback
- Heavy-duty 204 SQ frame for machine tool integration
Typical Applications
- CNC milling machines (main spindle)
- CNC turning centers (lathe spindle)
- Heavy machining centers
- Metal cutting and forming equipment
- Industrial CNC production systems