Magnetic levitating apparatus

Details Magnetic levitating apparatus Magnetic levitating apparatus

1993-12-07

1995-12-26

Oberleitner, Robert J.

Railways

Magnetically suspended car

Including means to sense or control car position or attitude...

B60L 1306

Patent

active

054777887

ABSTRACT:
A magnetic levitating apparatus comprises a guide rail, a levitated object, a plurality of magnetic support units, a plurality of gap-variable mechanisms, a sensor unit, and a controller. The controller performs zero power levitation force control and specific control. The zero power levitation force control is effected to reduce to zero an excitation current to the electromagnet of at least one of the magnetic support units thereby to stabilize the magnetic levitation state of the levitated object on the basis of an output from the sensor unit. The specific control is effected to control an excitation current to the electromagnet of at least one of the magnetic support units thereby to have the zero power levitation force control effected irrespective of the magnitude of a spring constant of the elastic member, on the basis of the output of the sensor unit.

REFERENCES:
patent: 3899979 (1975-08-01), Godsey
patent: 3937148 (1976-02-01), Simpson
patent: 4641586 (1987-02-01), Miller et al.
patent: 4924778 (1990-05-01), Morishita et al.
patent: 4967670 (1990-11-01), Morishita et al.
patent: 4972779 (1990-11-01), Morishita et al.
patent: 5156093 (1992-10-01), Azukizawa et al.

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