Patents by Inventor Johannes M. A. M. Van Geel

Johannes M. A. M. Van Geel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electromagnetic actuator having a cylindrical translation coil and a toroidal rotation coil, actuator unit comprising the actuator and a measurement system, and machine comprising the actuator or the actuator unit
    Patent number: 5600189
    Abstract: An electromagnetic actuator (1) comprises two actuator sections which are translatable relative to one another along an actuator axis (1a) and which are rotatable about the actuator axis, a first actuator section (1) comprising a coil system and a second actuator section (3) comprising a permanent magnet system for cooperation with the coil system via an air gap. The coil system is arranged on a magnetically conductive yoke (5) and comprises a cylindrical translation coil (9) and a toroidal rotation coil (7), which are coaxial with the actuator axis. The permanent magnet system comprises an annular magnet (11), which is coaxial with the actuator axis, for cooperation with both the translation coil and the rotation coil. The magnet has a radial magnetisation (B) which is interrupted by an annular segment (13). The magnetically conductive yoke has a central core (5b) around which the translation coil is arranged and a shell (5a) on which the rotation coil is disposed.
    Type: Grant
    Filed: July 6, 1995
    Date of Patent: February 4, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Johannes M. A. M. Van Geel, Johan C. Compter, Volker Kessler