Drive control apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorEiki Watanabe
Life of this patent
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Abstract
A drive control apparatus includes a magnetic field in which a magnetic field gradient is provided by applying a magnetic field to the magnetic fluid to produce an apparent specific gravity gradient in accordance with the magnetic field gradient. A control member immersed in the magnetic fluid moves under the influence of buoyant force from a gradient of the apparent specific gravity produced in accordance with the magnetic field gradient, so that a driven body interlocking with the control member is driven at a low noise level.
Claims11
A drive control apparatus for lifting a load comprising:
- a magnetic fluid having an apparent specific gravity which is changed by application of a magnetic field thereto;
- a container for receiving said magnetic fluid therein;
- a control member movable in said magnetic fluid in said container, said control member being connected to said load and made of a non-magnetic material;
- and
- magnetic field generating means for changing the apparent specific gravity of said magnetic fluid by applying a magnetic field to said magnetic fluid, thereby causing said control member to move responsive to a change in the apparent specific gravity of the fluid and lift the load.
A drive control apparatus for driving a driven body comprising:
- a magnetic fluid having an apparent specific gravity which is changed by application of a magnetic field thereto;
- a container for receiving said magnetic fluid therein;
- a control member movable in said magnetic fluid in said container, said control member being connected to said driven body and made of a non-magnetic material;
- and
- magnetic field generating means for changing the apparent specific gravity of said magnetic fluid by applying a magnetic field to said magnetic fluid, thereby causing said control member to move responsive to a change in the apparent specific gravity of the fluid, said magnetic field generating means being provided at one end of said container to apply a magnetic field to said magnetic fluid from one side thereof, whereby a magnetic field gradient is provided in said magnetic fluid, and said control member moves in said magnetic fluid in accordance with the apparent specific gravity of said magnetic fluid produced by said magnetic field gradient,
- wherein said driven body is a cage of an elevator, and said magnetic field generating means is provided on the lower side of said container to apply a magnetic field gradient to said magnetic fluid, whereby said cage connected to said control member is moved to a desired floor in accordance with the movement of said control member in said magnetic fluid.
Dependencies are inferred from the claim text.