Motor Rotor

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A motor rotor 10 comprising a magnet carrier 20; a magnet 40 carried by the magnet carrier; a sleeve 60 surrounding the magnet; and first and second circumferential seals 52 located to seal the magnet within a void between the carrier and the sleeve. The seals are located to hermetically seal the magnet at axial ends 30 of the magnet, wherein the magnet extends between the first and second seals. The magnet carrier and sleeve may extend axially beyond the first and second seals. The carrier may have an annular shoulder 27B positioned to locate the magnet at an axial position on the carrier, where the seal is located proximate to the shoulder. The shoulder may also have a circumferential recess 27C to receive the first seal and the carrier may also be dimensioned to receive the second seal. The seals may comprise of a potting compound or an O-ring, where the seals comprise a synthetic rubber and fluoro-polymer elastomer compound. The magnet may comprise a ring magnet that comprise a plurality of C-shaped magnet segments, where the magnet comprises a rare earth magnet, or one of a group comprising iron boron and samarium cobalt. The motor rotor may be used in a vacuum pump.