Magnetic chuck and method for producing a magnetic chuck
First Claim
1. A magnetic chuck, comprising:
- an upper base made of a single piece of magnetic-conductive material and having a top surface, sidewalls extending orthogonally from the top surface, a cavity formed within the upper base with an open end opposite to the top surface and an opposite closed end directed toward the top surface, and a plurality of cores extending orthogonally from the top surface and into the cavity;
a lower base;
a plurality of permanent magnets arranged within the cavity;
a reversible magnet arranged between each of the cores and the lower base; and
an excitation coil arranged around the circumference of each reversible magnet;
wherein a portion of the cavity between the permanent magnets and the closed end of the cavity is filled with a non-magnetic-conductive material and the portion of the cavity between the permanent magnets and the closed end of the cavity has an extension in a direction parallel to the top surface that is smaller than the extension of the permanent magnets in the same direction.
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Accused Products
Abstract
The invention is directed to a magnetic chuck and a method for producing a magnetic chuck. The magnetic chuck comprises an upper base made of a single piece of magnetic-conductive material and having a top surface, sidewalls extending orthogonally from the top surface, a cavity formed within the upper base with an open end opposite to the top surface and an opposite closed end directed toward the top surface. A plurality of cores extends orthogonally from the top surface and into the cavity, wherein a plurality of permanent magnets is arranged in the cavity. A reversible magnet is arranged between each of the cores and a lower base; and an excitation coil is arranged around the circumference of each reversible magnet. A portion of the cavity between the permanent magnets and the closed end of the cavity is filled with non-magnetic-conductive material.
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Citations
17 Claims
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1. A magnetic chuck, comprising:
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an upper base made of a single piece of magnetic-conductive material and having a top surface, sidewalls extending orthogonally from the top surface, a cavity formed within the upper base with an open end opposite to the top surface and an opposite closed end directed toward the top surface, and a plurality of cores extending orthogonally from the top surface and into the cavity; a lower base; a plurality of permanent magnets arranged within the cavity; a reversible magnet arranged between each of the cores and the lower base; and an excitation coil arranged around the circumference of each reversible magnet; wherein a portion of the cavity between the permanent magnets and the closed end of the cavity is filled with a non-magnetic-conductive material and the portion of the cavity between the permanent magnets and the closed end of the cavity has an extension in a direction parallel to the top surface that is smaller than the extension of the permanent magnets in the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for producing a magnetic chuck, the method comprising the steps of:
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providing a single piece of magnetic-conductive material having an upper base with a top surface; forming a cavity with an open end opposite to the top surface and an opposite closed end directed toward the top surface into the upper base such that from a top surface, sidewalls extend orthogonally from the top surface, and a plurality of cores extend orthogonally from the top surface and into the cavity; arranging a plurality of permanent magnets in the cavity to form a portion in the cavity between the permanent magnets and the closed end of the cavity; arranging a reversible magnet between each of the cores and a lower base; arranging an excitation coil around the circumference of each reversible magnet; filling the portion of the cavity between the permanent magnets and the closed end of the cavity with a non-magnetic-conductive material; and filling a remaining volume of the cavity with non-magnetic-conductive material, wherein the portion of the cavity between the permanent magnets and the closed end of the cavity is filled with non-magnetic-conductive material before the permanent magnets are placed into the cavity.
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14. A method for producing a magnetic chuck, the method comprising the steps of:
- providing a single piece of magnetic-conductive material having an upper base with a top surface;
forming a cavity with an open end opposite to the top surface and an opposite closed end directed toward the top surface into the upper base such that from a top surface, sidewalls extend orthogonally from the top surface, and a plurality of cores extend orthogonally from the top surface and into the cavity;
arranging a plurality of permanent magnets in the cavity to form a portion in the cavity between the permanent magnets and the closed end of the cavity;
arranging a reversible magnet between each of the cores and a lower base;
arranging an excitation coil around the circumference of each reversible magnet;
filling the portion of the cavity between the permanent magnets and the closed end of the cavity with a non-magnetic-conductive material; and
filling a remaining volume of the cavity with non-magnetic-conductive material, wherein the cavity is formed such that the portion of the cavity between the permanent magnets and the closed end of the cavity has an extension in a direction parallel to the top surface that is smaller than the extension of the permanent magnets in the same direction. - View Dependent Claims (15)
- providing a single piece of magnetic-conductive material having an upper base with a top surface;
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16. A method for producing a magnetic chuck, the method comprising the steps of:
- providing a single piece of magnetic-conductive material having an upper base with a top surface;
forming a cavity with an open end opposite to the top surface and an opposite closed end directed toward the top surface into the upper base such that from a top surface, sidewalls extend orthogonally from the top surface, and a plurality of cores extend orthogonally from the top surface and into the cavity;
arranging a plurality of permanent magnets in the cavity to form a portion in the cavity between the permanent magnets and the closed end of the cavity;
arranging a reversible magnet between each of the cores and a lower base;
arranging an excitation coil around the circumference of each reversible magnet;
filling the portion of the cavity between the permanent magnets and the closed end of the cavity with a non-magnetic-conductive material; and
filling a remaining volume of the cavity with non-magnetic-conductive material, wherein a spacer comprising a non-magnetic-conductive material is arranged within the portion of the cavity between the permanent magnets and the closed end of the cavity before the permanent magnets are placed into the cavity.
- providing a single piece of magnetic-conductive material having an upper base with a top surface;
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17. A magnetic chuck, comprising an upper base made of a single piece of magnetic-conductive material and having a top surface, sidewalls extending orthogonal from the top surface, a cavity formed within the upper base with an open end opposite to the top surface and an opposite closed end directed toward the top surface, and a plurality of cores extending orthogonal from the top surface and into the cavity, wherein a plurality of permanent magnets is arranged in the cavity and a reversible magnet is arranged between each of the cores and a lower base, an excitation coil is arranged around the circumference of each reversible magnet, a portion of the cavity between the permanent magnets and the closed end of the cavity is filled with a non-magnetic-conductive material, and a spacer comprising a non-magnetic-conductive material is arranged within the portion of the cavity between each permanent magnet and the closed end of the cavity, wherein the spacer is made of plastic.
Specification