Inner magnet of a magnetic coupling

1. An inner magnet assembly comprising:

an inner ring body;

at least one magnet disposed radially outward of and adjacent to the inner ring body and each magnet having a radially outward facing surface;

a sleeve slidably and sealingly mounted to the inner ring body, wherein the at least one magnet is sealed between the inner ring body and the sleeve; and

wherein the sleeve has an annular outer wall with at least one indentation corresponding to each magnet whereby when installed on the inner ring body, the radially outward facing surface of each magnet engages at least one sleeve indentation and the respective indentation biases the respective magnet radially inward against the inner ring body.

2. An inner magnet assembly in accordance with claim 1 , wherein the inner ring body comprises a magnet ring mounted to a rotor.

3. An inner magnet assembly in accordance with claim 1 , wherein the inner ring body comprises an integral magnet ring and rotor.

4. An inner magnet assembly in accordance with claim 1 , wherein with respect to each magnet the inner ring body further comprises guides each of which engages a portion of a side of the respective magnet.

5. An inner magnet assembly in accordance with claim 1 , wherein with respect to each magnet the inner ring body further comprises a planar surface which engages the respective magnet.

6. An inner magnet assembly in accordance with claim 1 , wherein the sleeve is removably mounted to the inner ring body.

7. An inner magnet assembly in accordance with claim 6 , further comprising at least two o-rings disposed between the inner ring body and the sleeve.

8. An inner magnet assembly in accordance with claim 1 , wherein the sleeve is bonded to the inner ring body.

9. An inner magnet assembly in accordance with claim 4 , wherein the guides are integrally formed in the outer surface of the inner ring body.

10. An inner magnet assembly in accordance with claim 4 , wherein the inner ring body has recessed portions located longitudinally between the guides and being integrally formed on the outer surface of the inner ring body.

11. An inner magnet assembly in accordance with claim 4 , wherein each magnet has a length and the guides do not extend along a substantial portion of the length of a respective magnet.

12. An inner magnet assembly in accordance with claim 2 , wherein the rotor of the inner ring body further comprises an impeller.

13. An inner magnet assembly in accordance with claim 3 , wherein the rotor of the inner ring body further comprises an impeller.