Drive Technology
Containment Shell
The containment shell — at TEA also called the barrier wall — is the non-magnetic wall between inner and outer rotor of a magnetic coupling. It hermetically separates the pumped medium from the drive side and is thus the safety-critical component.
Function
The magnetic field must pass through the containment shell, yet the shell itself must not short-circuit the field — which is why it is made of non-magnetic material. With electrically conductive materials (metals), eddy-current losses arise in the rotating field, generating heat and reducing efficiency. Wall thickness and material therefore determine tightness, pressure resistance and power loss.
Materials Compared
| Material | Property | Eddy Currents |
|---|---|---|
| Stainless steel (e.g. 1.4571) | Standard, pressure-resistant, readily available | Present |
| Hastelloy | Highest corrosion resistance | Present |
| Ceramic / zirconia | Low-loss, hard, sensitive to brittle fracture | None |
| PEEK / plastic | Light, chemically resistant, pressure-limited | None |
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