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Attraction type magnetic levitating apparatus
| Details |
Inventors: Morishita, Mimpei; Azukizawa, Teruo;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Peters, Jr.; Jospeh F.
Assistant Examiner: Mojica; Virna Lissi
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A plurality of stators of a linear induction motor are arranged at predetermined intervals, and guide rails are mounted on an upper portion of a track frame having a U-shaped section. A levitated object is magnetically levitated below the track frame so as to freely travel along the guide rails. Magnetic support units having electromagnets for obtaining a levitating force, optical gap sensors for detecting gap lengths between the support units and the guide rails, i.e., deviations in a levitating direction, and optical gap sensors for detecting deviations in a guiding direction perpendicular to a traveling direction of the levitated object are respectively arranged on the four corners of the upper surface of the levitated object. The length of each magnetic support unit is larger than the width of each guide rail. Each magnetic support unit is disposed such that the inner ends of the unit and the guide rail are aligned, and the outer end of the unit extends outward from that of the guide rail. A deviation between an output from each optical gap sensor and a corresponding reference value is fed back to a corresponding magnetic support unit, thereby controlling each electromagnet. |
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DETAILED DESCRIPTION It is an object of the present invention to provide an attraction type magnetic levitating apparatus which can properly perform attraction control operations in supporting and guiding directions, and can decrease the number of electromagnets required for the control operations so as to reduce the size and weight of the apparatus.
An attraction type magnetic levitating apparatus of the present invention comprises a ferromagnetic guide, a levitated object arranged near the guide, a magnetic support unit arranged on the levitated object so as to oppose the guide through a gap and including an electromagnet, a sensor section for detecting a magnetic state of a magnetic circuit constituted by the electromagnet, the guide, and the gap, and control means for stabilizing the magnetic circuit by controlling an exciting current of the electromagnet on the basis of output from the sensor section, and magnetically levitating the levitated object.
The magnetic support unit is arranged to oppose the guide so as to simultaneously generate a supporting force for levitating the levitated object and a guiding force in a direction substantially perpendicular to the supporting direction when the levitated object is magnetically levitated in a stable state.
The control means obtains a single or plurality of first physical values required to control the supporting force on the basis of output from the sensor section and a single or plurality of second physical values required to control the guiding force on the basis of output from the sensor section, both values which are associated with the magnetic circuit.
Another attraction type magnetic levitating apparatus of the present invention comprises a ferromagnetic guide, a levitated object arranged near the guide, a magnetic support unit arranged to oppose the guide through a gap and including an electromagnet, a sensor section for detecting a single or plurality of first physical values of a magnetic state of a magnetic circuit constituted by the electromagnet, the guide, and the gap, values which are required to control a supporting force, and control means for stabilizing the magnetic circuit by controlling an exciting current of the electromagnet on the basis of an output from the sensor section, and magnetically levitating the levitated object
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