Brushless PM machine construction enabling low coercivity magnets
First Claim
Patent Images
1. A brushless permanent magnet machine comprising:
- a rotor that is essentially circular shaped and having an inner circumference and outer circumference;
a pair of magnets arranged in the rotor, each magnet of the pair of magnets;
having a substantially concave contour with a pole at each end of the contour such that each pole is closer to the outer circumference than a region of the magnet between the two poles,having a radially outward side arranged closer to the outer circumference of the rotor and an radially inward side arranged closer to the inner circumference of the rotor,the radially outward side of each magnet defining a space in the region of the magnet between the two poles in the rotor between the outer circumference of the rotor and the radially outward side of the corresponding magnet, respectively, andeach of the pair of the magnets having a thickness direction extending along the contour of the corresponding magnet between the opposite poles of the corresponding magnet, respectively; and
a retaining component provided in each of the spaces in the rotor, each of the retaining components configured to secure a corresponding one of the magnets in place within the rotor, the plurality of retaining components being arranged entirely within the rotor;
wherein the pair of magnets are each composed of a non-rare earth material having a lower coercivity than a rare earth material, andwherein a direction of magnetization of each of the pair of magnets is parallel to the thickness direction of the corresponding magnet.
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Abstract
The present disclosure provides a brushless permanent magnet machine which includes an essentially circular shaped rotor, and a pair of magnets arranged in the rotor. The magnets are each U-shaped and have a thickness direction extending along a contour of the corresponding magnet between the opposite poles of the corresponding magnet, respectively. The magnets are each composed of a non-rare earth material having a lower coercivity than a rare earth material. A direction of magnetization of each of the pair of magnets is parallel to the thickness direction of the corresponding magnet. The present disclosure also provides a method of manufacturing such a brushless permanent magnet machine.
40 Citations
22 Claims
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1. A brushless permanent magnet machine comprising:
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a rotor that is essentially circular shaped and having an inner circumference and outer circumference; a pair of magnets arranged in the rotor, each magnet of the pair of magnets; having a substantially concave contour with a pole at each end of the contour such that each pole is closer to the outer circumference than a region of the magnet between the two poles, having a radially outward side arranged closer to the outer circumference of the rotor and an radially inward side arranged closer to the inner circumference of the rotor, the radially outward side of each magnet defining a space in the region of the magnet between the two poles in the rotor between the outer circumference of the rotor and the radially outward side of the corresponding magnet, respectively, and each of the pair of the magnets having a thickness direction extending along the contour of the corresponding magnet between the opposite poles of the corresponding magnet, respectively; and a retaining component provided in each of the spaces in the rotor, each of the retaining components configured to secure a corresponding one of the magnets in place within the rotor, the plurality of retaining components being arranged entirely within the rotor; wherein the pair of magnets are each composed of a non-rare earth material having a lower coercivity than a rare earth material, and wherein a direction of magnetization of each of the pair of magnets is parallel to the thickness direction of the corresponding magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a brushless permanent magnet machine, comprising:
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arranging a pair of a magnets in a rotor that is essentially circular shaped and having an inner circumference and an outer circumference, each magnet of the pair of magnets; having a substantially concave contour with a pole at each end of the contour such that each pole is closer to the outer circumference than a region of the magnet between the two poles, having a radially outward side arranged closer to the outer circumference of the rotor and an radially inward side arranged closer to the inner circumference of the rotor, the radially outward side of each magnet defining a space in the region of the magnet between the two poles in the rotor between the outer circumference of the rotor and the radially outward side of the corresponding magnet, respectively; forming each of the pair of magnets to have a thickness direction extending along the contour of the corresponding magnet between the opposite poles of the magnet, respectively; arranging a retaining component in a corresponding one of each of the spaces in the rotor, respectively, each of the retaining components being arranged to secure a corresponding one of the magnets in place within the rotor, the retaining components being arranged entirely within the rotor; and forming each of the pair of magnets to be composed of a non-rare earth material having a lower coercivity than a rare earth material, such that a direction of magnetization of each of the pair of U-shaped magnets is parallel to the thickness direction of the corresponding magnet. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification
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Current AssigneeDanfoss Power Solutions (US) Company (Danfoss A/S)
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Original AssigneeUQM Technologies, Inc. (Danfoss A/S)
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InventorsLutz, Jon, Ley, Josh
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Primary Examiner(s)KENERLY, TERRANCE L
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Application NumberUS13/407,084Publication NumberTime in Patent Office1,043 DaysField of Search310/156.43, 310/153.53, 310/156.18, 310/156.56, 310/156.23, 310/156.39, 310/156.12US Class Current310/156.39CPC Class CodesH02K 1/2753 the rotor consisting of mag...H02K 1/2766 having a flux concentration...Y02T 10/64 Electric machine technologi...Y10T 29/49012 Rotor
