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Sliding means with built-in moving-magnet linear motor

  • US 6,573,623 B2
  • Filed: 06/22/2001
  • Issued: 06/03/2003
  • Est. Priority Date: 06/22/2000
  • Status: Active Grant
First Claim
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1. A sliding means with built-in moving-magnet linear motor, comprising a bed and a table constituting paired members arranged for sliding movement relatively of each other, the table being movable lengthwise of the bed in a sliding manner with respect to the bed, a field magnet having unlike magnetic end poles juxtaposed alternately in polarity in a moving direction of the table, an armature winding assembly having armature windings installed on the bed in opposition to the field magnet, a magnetic sensor element installed on the bed in opposition to the field magnet to monitor a strength and direction of magnetic flux, and an auxiliary magnet arranged adjoining to one of the magnetic end poles of the field magnet and magnetized in a polarity opposite to the polarity of the one of the end poles, wherein a current in each armature winding interacts with magnetic flux created by the field magnet to produce an electromagnetic force to apply propulsion to the field magnet to drive the table with a desired position control, and the auxiliary magnet makes up for the magnetic flux at the one of the end poles of the field magnet, thereby making the magnetic sensor element detect an accurate position of the field magnet,wherein the field magnet is made of rare earth magnet and has therein the magnetic poles of a multiple of 4, which are juxtaposed alternately in polarity.

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