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AssigneeKoninklijke Philips Electronics N.V.
InventorsPetrus Carolus Maria Frissen, Johan Cornelia Compter, Michael Josepha Mathijs Renkens, George Arie Jan De Fockert, Rob Jacobus Matheus Coolen
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Positioning device having a first part (1) which is movable relative to a second part (2) in a X and Y-direction, said first part (1) comprising a carrier (5) on which a system of magnets (3) is arranged in a pattern of rows (7) and columns (8) parallel to the X- and Y-direction, respectively. The magnets in each row and column are arranged in a Halbach array, i.e. the magnetic orientation of each successive magnet in each row (7) and each column (8) is rotated through 90° counter-clockwise. The second part (2) comprises an electric coil system (4) with two types of electric coils (C1, C2), one type having an angular offset of +45° and the other type having an offset of −45° with respect to the X-direction. The magnet configuration causes a very strong magnetic field. The positioning device comprises a number of magnetically sensitive sensors (Hall sensors 45) giving a signal which depends on the local mutual positions of the permanent magnets of the first part relative to the electric coils of the second part in an area in which the parts overlap.
A displacement device with a first part and a second part which are displaceable relative to one another in at least an X-direction and a Y-direction perpendicular thereto, wherein the first part comprises a carrier which extends substantially parallel to the X-direction and the Y-direction and on which a system of magnets is fastened in a pattern of rows extending parallel to the X-direction and columns extending parallel to the Y-direction, wherein an equal distance is present each time between the rows and between the columns, wherein in each row and in each column magnets of a first kind (N) with a magnetization direction perpendicular to the carrier and directed to the second part and magnets of a second kind (Z) with a magnetization direction perpendicular to the carrier and directed away from the second part are positioned in alternation, and wherein a magnet of a third kind (H) with a magnetization direction directed from a magnet of the second kind (Z) to the magnet of the first kind (N) is arranged between the magnets of the first (N) and the second kind (Z), while the second part is provided with a system of electric coils with at least one electric coil of a first kind (C1), with current conductors situated in a magnetic field of the system of magnets and enclosing an angle of substantially 45° with the X-direction, and with at least one electric coil of a second kind (C2), also with current conductors (10) situated in the magnetic field of the system of magnets and enclosing an angle of substantially 45° with the X-direction but directed perpendicular to the current conductors of the first electric coil (C1), characterized in that the displacement device is provided with a number of sensors sensitive to magnetic fields, which sensors supply a signal which is dependent on the local mutual positions of the magnets of the first part relative to the electric coils of the second part in a region where these two parts overlap, the first part and the second part being independently movable relative to each other.
A displacement device with a first part and a second part which are displaceable relative to one another in at least an X-direction and a Y-direction perpendicular thereto, wherein the first part comprises a carrier which extends substantially parallel to the X-direction and the Y-direction and on which a system of magnets is fastened in a pattern of rows extending parallel to the X-direction and columns extending parallel to the Y-direction, wherein an equal distance is present each time between the rows and between the columns, wherein in each row and in each column magnets of a first kind (N) with a magnetization direction perpendicular to the carrier and directed to the second par and magnets o a second kind (Z) with a magnetization direction perpendicular to the carrier and directed away from the second part are positioned in alternation, and wherein a magnet of a third kind (H) with a magnetization direction directed from a magnet of the second kind (Z) to the magnet of the first kind (N) is arranged between the magnets of the first (N) and the second kind (Z), while the second part is provided with a system of electric coils with at least one electric coil a first kind (C1), with current conductors situated in a magnetic field of the system o magnets and enclosing an angle of substantially 45° with the X-direction, and with at least one electric coil of a second kind (C2), also with current conductors situated in the magnetic field of system of magnets and enclosing an angle of a substantially 45° with the X-direction but directed perpendicular to the current conductors of the first electric coil (C1), characterized in that the displacement device is provided with a number of sensors sensitive to magnetic fields, which sensors have two directions in which they are sensitive to magnetic fields and which supply a signal which is dependent on the local mutual positions of one or more magnets of the first part relative to the electric coils of the second part in a region where these two parts overlap.
A method of design for a displacement device comprising the steps of:
Dependencies are inferred from the claim text.