Ferrofluid-pole-piece magnetic apparatus and method of manufacture thereof.

摘要

Pole-piece-magnet apparatus for use as single- or double-pole-piece ferrofluid seal apparatus and method of manufacture, which pole-piece-magnet apparatus comprises at least one washer-type metal-pole-piece element (14) with one flat surface having a plurality of spaced-apart raised dimple elements (20) thereon with outwardly extending anchoring surfaces; and a washer-like hard molded permanent magnet polymer ring element (24) molded about and secured directly to the one flat surface of the pole-piece element by the anchoring surface on the raised dimples, the permanent magnet ring element having an inner diameter greater than the inner diameter of the pole-piece element and an outer diameter of about the same dimensions as the outer diameter of the pole-piece element.