Permanent magnet excited synchronous machine with embedded magnets
First Claim
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1. A permanent magnet excited synchronous machine comprising:
- a stator, said stator having a plurality of circumferential stator teeth;
a rotor configured to rotate in said stator;
a rotary shaft supporting said rotor for rotation on its axis;
a salient pole on said rotor, said salient pole including a shank, said salient pole including a shoe on said shank;
a rectangular cross-section cavity in said salient pole, said rectangular cavity having a cross-section major axis coincident with a chord of a circle delimited by the rotor diameter, said rectangular cavity having a radially-outer top wall parallel to said chord and said major axis;
an exciter permanent magnet in said rectangular cavity;
a plurality of selective flux barrier slots in said salient pole, said plurality of slots disposed radially outwardly of said permanent magnet and between said radially-outer top wall of said rectangular cavity and an external surface of said shoe;
said plurality of slots disposed in a fan arrangement relative to said chord so that slots of said plurality that are located circumferentially nearer to a main axis of said pole are inclined at a lesser absolute value of inclination angle relative to the main pole axis than are others of said slots relatively located circumferentially farther from the main pole axis; and
,said plurality of slots is a number selected to correspond to the number of said stator teeth radially opposite to said shoe.
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Abstract
A permanent magnet excited synchronous machine (1) with embedded magnets, which is particularly suitable for range extender generator. It includes stator (2) and rotor (3) being provided with exciter magnets (7). The rotor (3) has at least two rotor poles (4), each is provided with one exciter magnet (7). In order to increase the magnetic torque limit of the synchronous machine (1)—in each rotor pole (4) at least one, preferably several selective magnetic flux barriers, preferably as substantially radial slots (8) being parallel with the main pole flux is/are provided in the area of the pole shoe.
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Citations
21 Claims
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1. A permanent magnet excited synchronous machine comprising:
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a stator, said stator having a plurality of circumferential stator teeth; a rotor configured to rotate in said stator; a rotary shaft supporting said rotor for rotation on its axis; a salient pole on said rotor, said salient pole including a shank, said salient pole including a shoe on said shank; a rectangular cross-section cavity in said salient pole, said rectangular cavity having a cross-section major axis coincident with a chord of a circle delimited by the rotor diameter, said rectangular cavity having a radially-outer top wall parallel to said chord and said major axis; an exciter permanent magnet in said rectangular cavity; a plurality of selective flux barrier slots in said salient pole, said plurality of slots disposed radially outwardly of said permanent magnet and between said radially-outer top wall of said rectangular cavity and an external surface of said shoe; said plurality of slots disposed in a fan arrangement relative to said chord so that slots of said plurality that are located circumferentially nearer to a main axis of said pole are inclined at a lesser absolute value of inclination angle relative to the main pole axis than are others of said slots relatively located circumferentially farther from the main pole axis; and
,said plurality of slots is a number selected to correspond to the number of said stator teeth radially opposite to said shoe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A permanent magnet excited synchronous machine comprising:
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a stator, said stator having a plurality of circumferential stator teeth; a rotor configured to rotate in said stator; a rotary shaft supporting said rotor for rotation on its axis; a salient pole on said rotor, said salient pole including a shank, said salient pole including a shoe on said shank; a rectangular cross-section cavity in said salient pole, said rectangular cavity having a cross-section major axis coincident with a chord of a circle delimited by the rotor diameter, said rectangular cavity having a radially-outer top wall parallel to said chord and said major axis; an exciter permanent magnet in said rectangular cavity; a plurality of selective flux barrier slots in said salient pole, said plurality of slots disposed radially outwardly of said permanent magnet and between said radially-outer top wall of said rectangular cavity and an external surface of said shoe; a plurality of flux barrier permanent magnets, each respective one of said plurality of flux barrier permanent magnets disposed in a respective one of said plurality of slots; said flux barrier permanent magnets being wedge-shaped in their respective longitudinal cross-sections and tapered in a radial direction toward said rotary shaft; and
,said plurality of slots is a number selected to correspond to the number of said stator teeth radially opposite to said shoe. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A permanent magnet excited synchronous machine comprising:
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a stator; a rotor configured to rotate in said stator; at least two rotor poles on said rotor; a respective exciter magnet disposed in each respective one of said at least two rotor poles; each of said at least two rotor poles respectively having a respective plurality of openings formed as selective flux barriers configured to increase magnetic torque limit and reduce rotor pole cross-flux, said selective flux barriers each being in the form of a respective radially extending slot having a constant width over substantially its entire length; said stator having a plurality of circumferential stator teeth; and
,said plurality of slots is a number selected to correspond to the number of said stator teeth radially opposite to said shoe.
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16. A permanent magnet excited synchronous machine comprising:
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a stator; a rotor configured to rotate in said stator; at least two rotor poles on said rotor; a respective exciter magnet disposed in each respective one of said at least two rotor poles; each of said at least two rotor poles respectively having a respective plurality of openings formed as selective flux barriers configured to increase magnetic torque limit and reduce rotor pole cross-flux, said selective flux barriers each being in the form of a respective radially extending slot having a constant width over substantially its entire length; said stator having a plurality of circumferential stator teeth; and
,a first ratio, of minimum distance between adjacent ones of said plurality of slots to width of said slots, is greater than or equal to a second ratio, of stator tooth width to width of a stator gap between adjacent ones of said plurality of stator teeth.
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17. A permanent magnet excited synchronous machine comprising:
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a stator; a rotor configured to rotate in said stator; at least two rotor poles on said rotor; a respective exciter magnet disposed in each respective one of said at least two rotor poles; each of said at least two rotor poles respectively having a respective plurality of openings formed as selective flux barriers configured to increase magnetic torque limit and reduce rotor pole cross-flux, said selective flux barriers each being in the form of a respective radially extending slot having a constant width over substantially its entire length; and
,a flux barrier permanent magnet in at least one of said plurality of slots. - View Dependent Claims (18, 19, 20, 21)
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Specification