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Magnetic fields

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Magnetic fields

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    1. 26/08/97 Issue A 1 Magnetic fields Pump should not be operated in magnetic fields Rotors cutting a magnetic field produces eddy current heating Heating thus produced causes rotor and bearing heating and premature failure COULD FAIL WITHIN 1 HOUR !

    2. 26/08/97 Issue A 2 Maximum fields Axial 7 mTesla Radial 3 mTesla

    3. 26/08/97 Issue A 3 Sources of magnetic fields Magnets from standard Penning / AIM heads Do not fit head within 100mmof turbo pump Low field AIM can be fitted at any distance Magnets used in the application Example : beam bending as in mass spectrometer heads Superconducting magnets in Sector MS machines

    4. 26/08/97 Issue A 4 Symptom of magnetic field heating Heating is produced internally - in the rotor Casing is still at an acceptable temperature Not dealt with by external cooling Power drawn increases when field is applied a few watts increase is a indication of trouble Worst case causes rapid bearing failure and/or rotor stator crash

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