Importance

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Abstract

A seal includes a magnetic circuit having a permanent magnet providing excitation. A rotatable shaft has a straight cylindrical outer surface and is supported in a ball bearing system. A magnetically conductive bearing ring is mounted on the shaft immediately adjacent one end of the bearing system. The bearing ring has two radial portions of different thicknesses, the outer portion being thinner than the inner portion adjacent the shaft. A permanent magnet ring is located adjacent the bearing ring on the side opposite the bearing system. A labyrinth gap is defined between the bearing system and the permanent magnet ring on both sides of the bearing ring radially extending therebetween, and a ring pole is located axially adjacent the permanent magnet ring on the opposite side of the bearing system. An active pole gap is defined between the inner diameter of the ring pole and the shaft and is filled with a magnetically conductive fluid, the gap being essentially in series with the labyrinth gap.

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First Claim