During normal operation heat is generated inside the magnetic coupling due to hydraulic friction and eddy currents in the wall of the separation can by the moving magnetic fields. Cooling of the cou- pling see chapter 3.16.3 Circulation pump.
Maximum allowable temperature and nominal torque
Samarium Cobalt (SmCo): 280°C
Neodymium Iron Boron (NdFeB): 120 °C
The type of the magnetic coupling is related to the selected pump type. There are three types of magnetic couplings with different nominal diameters to cover the five pump sizes. Each coupling type is available with magnets in different lengths and in both magnetic materials. (see table
below).
|
| Nominal |
| Length of magnets [mm] |
| ||
|
| diameter |
|
|
|
|
|
|
| [mm] | 40 | 60 | 80 | 100 | 120 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
TG MAG | / | 110 | x | x | x | - | - |
|
|
|
|
|
|
|
|
TG MAG | / | 165 | x | x | x | x | - |
|
|
|
|
|
|
| |
TG MAG | 215 | x | x | x | x | x | |
|
|
|
|
|
|
|
|
The material of the magnets and the required length of the magnets must be selected according to the operating conditions and the maximum allowable temperature. Please contact your disributor regarding the correct sizing of the magnetic coupling.
Material magnetic coupling parts
Inner magnetic rotor: | stainless steel 1.4571 |
| (magnets and iron parts completely encapsulated) |
Outer magnetic rotor: | carbon steel |
Separation can: | flange and bottom plate: stainless steel 1.4571 |
| thin walled pipe portion: Hastelloy C4 |
3.16.2 Rotor bearing assembly
The rotor bearings are designed to support the radial and axial load generated by the rotor and
are lubricated by the pumped liquid. The bearing assembly is supplied as a complete set, consisting of two radial bearing bushes mounted in the bearing holder, two separate axial bearing faces and a shaft sleeve. The shaft sleeve is clamped between the two axial bearings via a shaft nut and is rotating with the shaft. The front faces of the radial bearing bushes are acting as axial bearing faces. The axial bearing clearance is determined by the length of the shaft sleeve, so there is no adjustment required. That means in case of wear or damage the complete bearing assembly must be exchanged.
Front axial bearing
Radial bearing holder
Shaft sleeve
Rear axial bearing +
Hub inner magnetic rotor
A.0500.551 – | 23 |
