FAULT-TOLERANT SYNCHRONOUS PERMANENT MAGNET MACHINE
First Claim
Patent Images
1. A fault-tolerant synchronous permanent magnet machine, comprising:
- a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said teeth having two side faces terminating at a distal head, each of said distal heads having a head end that provides a plurality of head ends spaced around said interior cylindrical surface;
a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator;
a retaining sleeve having an axial length and disposed between the permanent magnets and the interior cylindrical surface of the stator,wherein the retaining ring defines a gap between the retaining sleeve and the interior cylindrical surface of the stator; and
wherein the retaining sleeve is axially segmented.
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Abstract
A fault tolerant synchronous permanent magnet machine is disclosed that reduces rotor losses by limiting eddy-current losses in the retaining sleeve. The machine limits eddy-current loss by any one or combination of axially segmenting the retaining sleeve, providing a highly electrically conductive non-magnetic shield to the retaining sleeve, and by configuring stator teeth width, stator teeth tip width, and slot distribution of the stator.
31 Citations
20 Claims
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1. A fault-tolerant synchronous permanent magnet machine, comprising:
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a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said teeth having two side faces terminating at a distal head, each of said distal heads having a head end that provides a plurality of head ends spaced around said interior cylindrical surface; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator; a retaining sleeve having an axial length and disposed between the permanent magnets and the interior cylindrical surface of the stator, wherein the retaining ring defines a gap between the retaining sleeve and the interior cylindrical surface of the stator; and wherein the retaining sleeve is axially segmented.
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2. A fault-tolerant synchronous permanent magnet machine, comprising:
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a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said distal heads having a head end that provides a plurality of head ends spaced around said interior cylindrical surface; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator; a retaining sleeve having an axial length and an outer radial surface and disposed between the permanent magnets and the interior cylindrical surface of the stator; a shield disposed upon the outer radial surface of the retaining sleeve; and a gap between the shield and the interior cylindrical surface of the stator. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A fault-tolerant synchronous permanent magnet machine, comprising:
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a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said distal heads have a head end that provides a plurality of head ends that circumferentially span said interior cylindrical surface and spaced to create slot openings to the slots; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator; a retaining sleeve having an axial length and an outer radial surface and disposed between the permanent magnets and the interior cylindrical surface of the stator, wherein the retaining sleeve defines a gap between the retaining sleeve and the interior cylindrical surface of the stator, and wherein the slots between the plurality of teeth of the stator are irregularly circumferentially spaced. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. The machine of claim 15, wherein the shield comprises copper.
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16. A method of reducing eddy-current losses in a permanent magnet machine, comprising:
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providing an permanent magnet machine comprising; a stator having and axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said teeth having two side faces terminating at a distal head, each of said distal heads having a head end that provides a plurality of head ends spaced around said interior cylindrical surface; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator; and a retaining sleeve having an axial length and an outer radial surface and disposed between the permanent magnets and the interior cylindrical surface of the stator; wherein the retaining sleeve defines a gap between the retaining sleeve and the interior cylindrical surface of the stator; and axially segmenting the retaining sleeve. - View Dependent Claims (17)
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18. A method of reducing eddy-current losses in a permanent magnet machine, comprising:
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providing an permanent magnet machine comprising; a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said teeth having two side faces terminating at a distal head, each of said distal heads having a head end that provides a plurality of head ends spaced around said interior cylindrical surface; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core f facing the interior cylindrical surface of the stator; and a retaining sleeve having an axial length and an outer radial surface and disposed between the permanent magnets and the interior cylindrical surface of the stator; wherein the retaining sleeve defines a gap between the retaining sleeve and the interior cylindrical surface of the stator; and providing a copper shield upon the outer radial surface of the retaining sleeve.
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19. A method of reducing eddy-current losses in a permanent magnet machine, comprising:
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providing an permanent magnet machine comprising; a stator having an axial length and a plurality of teeth spaced to define slots therebetween and circumferentially aligned to define an interior cylindrical surface for the stator, each of said teeth having two side faces terminating at a distal head, each of said distal heads have a head end that provides a plurality of head ends that circumferentially span said interior cylindrical surface and spaced to create slot openings to the slots; a rotor having an axial length and comprising a rotor core fixed to a rotatable shaft for rotation therewith and a plurality of permanent magnets mounted on said rotor core at a plurality of locations circumferentially spaced around said rotor core facing the interior cylindrical surface of the stator; and a retaining sleeve having an axial length and an outer radial surface and disposed between the permanent magnets and the interior cylindrical surface of the stator; wherein the retaining sleeve defines a gap between the retaining sleeve and the interior cylindrical surface of the stator; and forming the slots between the plurality of teeth of the stator such that that slots are irregularly circumferentially spaced. - View Dependent Claims (20)
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Specification