Description
TM-RBP340J20 is a Mitsubishi Electric TM-RB series direct-drive servo motor primary side (stator/coil unit) used for very high-torque CNC rotary tables and large indexing/4th–5th axis systems.
It is one of the largest TM-RB motors, designed for heavy machining applications.
🔧 Key specifications (TM-RBP340J20)
| Parameter | Value |
|---|---|
| Series | TM-RB |
| Type | Primary side (stator) |
| Rated torque | 340 N·m |
| Max torque | ~850 N·m |
| Rated speed | 200 r/min |
| Max speed | 400 r/min |
| Rated output | ~7.1 kW |
| Motor inertia | 2778 × 10⁻⁴ kg·m² |
| Cooling | Liquid cooling |
| Protection class | IP00 |
| Stator outer diameter | Ø330 mm |
| Stator inner diameter | Ø205 mm |
| Height | ~154 mm |
| Primary mass | ~33 kg |
| Matching rotor | TM-RBS340J20 |
| Drive systems | Mitsubishi MDS-D2 / MDS-DJ series |
(Source: Mitsubishi TM-RB direct drive motor specifications)
⚙️ What it is used for
This motor is designed for:
- Large CNC rotary tables (heavy-duty machining centers)
- High inertia indexing systems
- 5-axis machines requiring very high holding torque
- Gearless, backlash-free rotary motion under heavy load
⚠️ Important design notes
- Requires liquid cooling for continuous rated torque operation
- IP00 rating → must be installed inside a protected machine enclosure
- Rotor is strongly magnetized, requiring careful handling during assembly
- Precise air gap alignment between stator and rotor is critical for performance