Magnet and holder assembly having improved rotational and axial stability

摘要

A magnet held in a magnet holder is constrained against radial or axial instability, or against both, by a shape on either component in contact with complementary shape on the other component, the shaped components generally defining a tab-and-slot arrangement. The magnet component may be a bonded magnet and in one embodiment may be formed in place by injection molding. The magnet also will exhibit improved magnet properties when magnetized to have lines of polarity matching a path defined by the bulk of the magnetic material as governed by the location of tabs on the magnet. The invention is useful in magnet-sensor assemblies found in industrial applications and in automotive applications such as power steering systems.

主权项

1. A magnet/magnet-holder assembly having improved relative stability during high speed rotation, the assembly comprising:
a. a non-magnetic magnet holder comprising an interior cavity with at least one shaped wall; b. a shaped magnet positioned in the interior cavity, the magnet having a shape substantially complementary to that of the interior cavity; c. the interior cavity comprised further of an axial constraint; and d. an adhesive layer between the magnet and the magnet holdersuch that contact between the shaped magnet, the at least one shaped wall and the axial constraint of the interior cavity constrains relative axial movement and relative radial movement between the magnet and magnet holder.