Patent ID: 7990135
Filing Date: 2011-08-02
Classification: G01B

Abstract:
1. An apparatus for detecting whether a magnetic element is mounted at a correct position on a retaining member, the retaining member comprising a rectangular frame, the apparatus comprising: a holder comprising a post and a supporter, the post having a plurality of engaging holes formed therein arranged along a lengthwise direction thereof, the supporter having a pole removably engagable in a selected one of the engaging holes, and a substrate attached to the pole; a magnetoresistive sensor positioned at the substrate, and capable of sensing a present magnetic flux from the magnetic element; a processor electrically connected to the magnetoresistive sensor and having a predetermined reference magnetic flux information stored therein, the processor configured for receiving the present magnetic flux and comparing the present magnetic flux with the reference magnetic flux information, and thereby detecting whether the magnetic element is mounted at a correct position on the retaining member; and a motor comprising a rotatable shaft, the shaft comprising a rectangular sleeve mounted on an end thereof, and the rectangular sleeve configured for having the retaining member removably engaged therewith.