The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1989
Filed:
May. 13, 1987
Mimpei Morishita, Tokyo, JP;
Teruo Azukizawa, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a transporting system, four magnetic units are mounted on corners of carrier and the carrier is suspended under rails by electromagnetic attractive forces acting between the magnetic units and the bottom section of the rails. Each of the magnetic unit has a permanent magnet and electromagnets and gap sensors are provided on the carrier to sense a gap between each magnetic unit and rail. A battery for supplying a current to the magnetic unit is mounted on the carrier 15. The carrier is floated in a zero steady-state power control mode, even when an external force is applied to the carrier by a zero steady-state power control circuit which maintain the steady-state current supplied to the magnetic unit to be substantially zero. The carrier is softly landed on the rail or started to move from the rail in response to an external command in a soft landing or a soft start mode by an actuating unit 67. In the soft landing and the soft start mode, the zero steady-state power control circuit is opened and the current supplied to the magnetic unit is controlled in accordance with a target value by an actuating unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile