Contactless Magnetic Couplings
What is magnetic torque coupling?
The magnetic torque coupling transmits torque without contact through magnetic forces between the internal and external rotor. Beijing Magnet Trading Co., Ltd designs these to ensure hermetic separation between driving and driven sides in pumps and agitators, sealing hazardous liquids and gases reliably.
It consists of an external and an internal rotor. The external rotor features high-quality permanent magnets with changing polarity on the inner side, while the internal rotor has them on the outside.
How does magnetic torque coupling work?
The system operates synchronously under a constant torsion angle. If the maximum coupling torque or torsion angle is exceeded, power transmission is automatically interrupted. This feature effectively protects the motor from burning out due to overload.
Typical Applications
- Gear pumps and centrifugal pumps.
- Screw spindle pumps and agitators.
- PU foaming lines and chemical processing.
Technical Specifications & Notes
- Design Options: Proven designs available; custom drawings can be evaluated for free.
- Tolerances: Standard Bore H7; Keyway JS9E.
- Standard Materials: Stainless Steel 304 housing with Neodymium magnets.
- High-Temp Options: Custom Samarium Cobalt magnetic couplers available for temperatures up to 280°C (536°F).
- Global Service: No MOQ; Global door-to-door delivery provided by Beijing Magnet Trading Co., Ltd.
Shaft Fixing Methods
- Type A: Setscrew - Simple for low to medium loads.
- Type B: Setscrew and Keyway - Reliable for higher torque.
- Type C: Clamping Hub - Precision slot and keyway for high-speed stability.
Magnetic Disc vs Co-axial Coupling
| Feature | Magnetic Disc (XD) | Co-axial (XC) |
|---|---|---|
| Contactless | Yes (√) | Yes (√) |
| Axial Forces | High (Must be restrained) | Near zero axial force |
| Adjustment | Via Air Gap | Via Axial Separation |
| Barrier | Simple flat barrier | Top-hat shaped barrier |
| Temp Limit | 150°C / 300°C | 150°C / 300°C |