Permanent magnet assembly
First Claim
Patent Images
1. A permanent magnet assembly comprising:
- an arc-shaped flux return section formed of magnetically permeable material and extending along a portion of an arc and having an upper portion with a first end and a second end, a lower portion with a first end and a second end, and a middle portion with a first end and a second end, wherein the first end of the upper portion is operatively coupled to the first end of the middle portion and the first end of the lower portion is operatively coupled to the second end of the middle portion;
an upper arc-shaped permanent magnet section having a north end and a south end, wherein the north end of the upper arc-shaped permanent magnet section is operatively coupled to the second end of the upper portion of the arc-shaped flux return section; and
a lower arc-shaped permanent magnet section having a north end and a south end, wherein the south end of the lower arc-shaped permanent magnet section is operatively coupled to the second end of the lower portion of the arc-shaped flux return section;
wherein an arc-shaped gap is formed between the south end of the upper arc-shaped permanent magnet section and the north end of the lower arc-shaped permanent magnet section.
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Abstract
A permanent magnet assembly is disclosed that is adapted to provide a magnetic field across an arc-shaped gap. Such a permanent magnet assembly can be used, for example, to provide a time-varying magnetic field to an annular region.
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Citations
50 Claims
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1. A permanent magnet assembly comprising:
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an arc-shaped flux return section formed of magnetically permeable material and extending along a portion of an arc and having an upper portion with a first end and a second end, a lower portion with a first end and a second end, and a middle portion with a first end and a second end, wherein the first end of the upper portion is operatively coupled to the first end of the middle portion and the first end of the lower portion is operatively coupled to the second end of the middle portion;
an upper arc-shaped permanent magnet section having a north end and a south end, wherein the north end of the upper arc-shaped permanent magnet section is operatively coupled to the second end of the upper portion of the arc-shaped flux return section; and
a lower arc-shaped permanent magnet section having a north end and a south end, wherein the south end of the lower arc-shaped permanent magnet section is operatively coupled to the second end of the lower portion of the arc-shaped flux return section;
wherein an arc-shaped gap is formed between the south end of the upper arc-shaped permanent magnet section and the north end of the lower arc-shaped permanent magnet section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A permanent magnet assembly comprising:
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a central flux return section formed of magnetically permeable material and having an upper portion with a first end and a second end, a lower portion with a first end and a second end, and a central portion with a first end and a second end, wherein the first end of the upper portion is operatively coupled to the first end of the central portion and the first end of the lower portion is operatively coupled to the second end of the central portion;
an upper arc-shaped permanent magnet section having a north end and a south end, wherein the north end of the upper arc-shaped permanent magnet section is operatively coupled to the second end of the upper portion of the central flux return section; and
a lower arc-shaped permanent magnet section having a north end and a south end, wherein the south end of the lower arc-shaped permanent magnet section is operatively coupled to the second end of the lower portion of the central flux return section;
wherein an arc-shaped gap is formed between the south end of the upper arc-shaped permanent magnet section and the north end of the lower arc-shaped permanent magnet section. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A permanent magnet assembly comprising:
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an upper flux return section formed of magnetically permeable material and having a middle section, a first end, and a second end;
a first arc-shaped upper permanent magnet section having a south end, and a north end operatively coupled to the first end of the upper flux return section;
a second arc-shaped upper permanent magnet section having a north end, and a south end operatively coupled to the second end of the upper flux return section;
a lower flux return section formed of magnetically permeable material and having a middle section, a first end, and a second end;
a first arc-shaped lower permanent magnet section having a north end, and a south end operatively coupled to the first end of the lower flux return section; and
a second arc-shaped lower permanent magnet section having a south end, and a north end operatively coupled to the second end of the lower flux return section;
wherein a first arc-shaped gap is formed between the south end of the first arc-shaped upper permanent magnet section and the north end of the first arc-shaped lower permanent magnet section and wherein a second arc-shaped gap is formed between the north end of the second arc-shaped upper permanent magnet section and the south end of the second arc-shaped lower permanent magnet section. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A permanent magnet assembly comprising:
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a central permanent magnet section having a north end and a south end;
an upper pole piece formed of magnetically permeable material and having a first end bearing an arc-shaped side pole piece portion having a pole face, and a second end bearing an arc-shaped side pole piece portion having a pole face; and
a lower pole piece formed of magnetically permeable material and having a first end bearing an arc-shaped side pole piece portion having a pole face, and a second end bearing an arc-shaped side pole piece portion having a pole face;
wherein a first arc-shaped gap is formed between the pole face of the arc-shaped side pole piece portion of the first end of the upper pole piece and the pole face of the arc-shaped side pole piece portion of the first end of the lower pole piece and a second arc-shaped gap is formed between the pole face of the arc-shaped side pole piece portion of the second end of the upper pole piece and the pole face of the arc-shaped side pole piece portion of the second end of the lower pole piece. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. A permanent magnet assembly comprising:
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an upper flux return section formed of magnetically permeable material and having a middle portion, a first end, and a second end;
a first arc-shaped upper permanent magnet section having a south end, and a north end operatively coupled to the first end of the upper flux return section;
a second arc-shaped upper permanent magnet section having a south end, and a north end operatively coupled to the second end of the upper flux return section;
a lower flux return section formed of magnetically permeable material and having a middle portion, a first end, and a second end;
a first arc-shaped lower permanent magnet section having a north end, and a south end operatively coupled to the first end of the lower flux return section;
a second arc-shaped lower permanent magnet section having a north end, and a south end operatively coupled to the second end of the lower flux return section; and
a central flux return section formed of magnetically permeable material and having a middle section, a first end operatively coupled to the middle portion of the upper flux return section, and a second end operatively coupled to the middle portion of the lower flux return section;
wherein a first arc-shaped gap is formed between the south end of the first arc-shaped upper permanent magnet section and the north end of the first arc-shaped lower permanent magnet section and wherein a second arc-shaped gap is formed between the south end of the second arc-shaped upper permanent magnet section and the north end of the second arc-shaped lower permanent magnet section. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification