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US 5,263,558 AGranted
Electromagnetic strut assembly
AssigneeAtsugi Unisia Corporation
InventorFumiyuki Yamaoka
Life of this patent
Estimating the term…
Abstract
An electromagnetic strut comprises a coil assembly including a plurality of coils arranged along a predetermined axis, and a magnetic device movable relative to the coil assembly along the predetermined axis. The magnetic device includes a magnetic circuit which produces two magnetic fields spaced at a distance along the predetermined axis, Each of the plurality of coils has an axial dimension less than the distance at which the two magnetic fields of the magnetic circuit are spaced.
Claims20
An electromagnetic strut, comprising:
- a coil assembly;
- and
- a magnetic device movable relative to said coil assembly along a predetermined axis,
- wherein said magnetic device includes a magnetic circuit, said magnetic circuit including a plurality of permanent magnets which are arranged to produce two magnetic fields spaced at a distance along said predetermined axis and said coil assembly extending through said magnetic fields, with said magnetic device including a plurality of such magnetic circuits equi-angularly spaced one after another;
- said coil assembly including a plurality of coils arranged along said predetermined axis;
- and
- a dual-walled support structure having an outer tube of a ferromagnetic material and an inner rod of a ferromagnetic material, and wherein said plurality of permanent magnets include a plurality of first pairs of opposed permanent magnets, each of said first pairs being attached to said outer tube and said inner rod, respectively, a plurality, corresponding in number to said plurality of first pairs, of second pairs of opposed permanent magnets, each of said second pairs being attached to said outer tube and said inner rod, respectively.
4 more elements
An electromagnetic strut, comprising:
- a coil assembly including a plurality of coils arranged along a predetermined axis;
- a magnetic device movable relative to said coil assembly along said predetermined axis, said magnetic device including a magnetic circuit, said magnetic circuit including a plurality of permanent magnets arranged to produce two magnetic fields spaced at a distance along the predetermined axis;
- said plurality of coils of said coil assembly extending through said magnetic fields;
- each of the plurality of coils having an axial dimension less than the distance at which the two magnetic fields of said magnetic circuit are spaced;
- stroke sensor means for detecting a stroke of movement of said magnetic device relative to said coil assembly along said predetermined axis and generating a stroke indicative signal indicative of said stroke detected;
- acceleration sensor means for detecting an acceleration of said movement of said magnetic device relative to said coil assembly and generating an acceleration indicative signal indicative of said acceleration detected;
- load sensor means for detecting a load which said magnetic device and coil assembly are subject to along said predetermined axis and generating a load indicative signal indicative of said load detected;
- a control unit operatively coupled with said stroke sensor means, said acceleration sensor means and said load sensor mean for receiving said stroke indicative signal, said acceleration indicative signal and said load indicative signal, said control unit including:
- means for supplying electric current to one of the coils disposed within one of the two magnetic fields to flow in a first direction perpendicular to the direction of said one magnetic field and also to the predetermined axis along which the magnetic device is moveable;
- and
- means for supplying electric current to another one of the coils disposed within the other of the two magnetic fields to flow in a second direction perpendicular to the direction of said the other magnetic field and also to the predetermined axis along which the magnetic device is moveable.
8 more elements
An electromagnetic strut, comprising:
- a magnetic device movable along a predetermined axis, said magnetic device including a magnetic circuit, said magnetic circuit including a plurality of permanent magnets arranged to produce two magnetic fields spaced at a distance along said predetermined axis;
- a coil assembly having a coil carrier including a sleeve and a plurality of coils arranged along said predetermined axis and winding said sleeve, said sleeve extending through said two magnetic fields.
Dependencies are inferred from the claim text.