Patents Assigned to Linear Drives Limited
  • Coaxial linear motor for extended travel
    Patent number: 6313552
    Abstract: A multiphase linear motor has an elongated stator with a stack of permanent magnets end-to-end along its length and a coaxial drive coil configuration which is such as to leave a gap permitting mechanical support of the permanent magnets at least at intervals along the length of the stator intermediate its ends. Specifically the drive coils comprise sub-coils with arcuate turns which subtend less than 360° around the motor axis to leave free a gap for the aforementioned mechanical support.
    Type: Grant
    Filed: November 22, 1999
    Date of Patent: November 6, 2001
    Assignee: Linear Drives Limited
    Inventor: Gerard Sean Boast
  • Linear motor for extended travel
    Patent number: 5703417
    Abstract: In a linear motor, the drive coils (5a,5b) on the armature are formed by a number of sub-coils (6a.sub.1,6a.sub.2,6a.sub.3,6b.sub.1,6b.sub.2,6b.sub.3) oriented laterally of the motor axis subject to lateral magnetic fields generated by pairs of magnets (3a,3b) on the stator. The sub-coils are so arranged that the fields produced by the adjacent winding portions (8 and 9, 10 and 11) of an adjacent pair of sub-coils are of the same polarity.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: December 30, 1997
    Assignee: Linear Drives Limited
    Inventor: Hugh-Peter Granville Kelly