| 摘要 |
A fluid pump (10) with rotary impeller (68) is disclosed which comprises an electromagnetically-driven (30), bearing five, seal-free rotary impeller (68) levitated by localized opposed, repulsive, permanent magnetic forces (60, 64) only. Levitation by lo- calized opposed magnetic or magnetic and fluid forces (52) of an impeller driven by electromagnetic forces eliminates the need for bearings and seals in the driving mechanism. This avoids the heat build- up and leakage associated with other pumping me- chanisms which can be of importance in pumping of physiological fluids such as blood. The levitating forces of the present in- vention are applied repulsively both axially and radially with respect to th e impeller and are auto-adjusting, such that any at- tempted displacement of the impeller will automatically incur a corrective change in levitating forces. The invention should be of use in numerous medical and non-medical applications where the benefits of impeller levitation by localized forces are apparent.
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