Description
TM-RBS340J20 is the secondary-side rotor (magnet ring assembly) for the Mitsubishi Electric TM-RB series direct-drive motor system. It pairs with the stator TM-RBP340J20 to form a complete high-torque CNC rotary axis motor.
🔧 Key specifications (TM-RBS340J20)
| Parameter | Value |
|---|---|
| Series | TM-RB |
| Type | Secondary side (rotor / magnet unit) |
| Matching stator | TM-RBP340J20 |
| Rated torque system | 340 N·m class |
| Max torque system | ~850 N·m class |
| Rotor outer diameter | ~Ø220–230 mm (class J frame) |
| Rotor inner diameter | H8 precision fit bore |
| Mounting | Multiple M6 threaded holes |
| Mass | ~10–12 kg (approx.) |
| Protection | IP00 |
| Application | CNC rotary tables / heavy 5-axis machines |
⚙️ What it actually is
- This is the permanent magnet rotor ring, not a complete motor.
- It provides the magnetic field that interacts with the stator to generate torque.
- Works only when assembled with TM-RBP340J20 with a controlled air gap.
⚠️ Handling / installation notes
- Delivered fully magnetized → extremely strong attraction force
- Requires controlled assembly to avoid:
- sudden snapping to stator
- magnet surface chipping
- Must maintain precise air gap (TM-RB systems use tight tolerance alignment)
- Always used in liquid-cooled, enclosed CNC machine environments (IP00 design)
🧠 Simple explanation
TM-RBS340J20 is just the rotating magnetic “ring” of a very high-torque CNC direct-drive motor. On its own it cannot operate — it becomes a motor only when paired with TM-RBP340J20.