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US 2017/0317540 A1Published application
Ipm machine with specialized rotor for automotive electric vechicles
AssigneeFaraday & Future Inc.
InventorOmar Abdul Rahman Laldin
Life of this patent
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Abstract
Certain aspects relate to designs for an interior permanent magnet (IPM) electrical machine rotor and magnets having a double layer split interior magnet configuration. Compared to existing designs, the disclosed rotor design has an increased amount of magnet material, more elongated and thinner slots, a wider angle for the “nested-v” configuration, and wider branches between layers of magnets, resulting in an improved power density.
Claims23
An interior permanent magnet electrical machine comprising:
- a stator comprising a plurality of stator teeth separated by a plurality of gaps;
- a rotor positioned within the stator, the rotor comprising:
- a rotor body comprised of magnetically permeable material configured for conducting magnetic flux,
- a plurality of magnet slot clusters, each comprising:
- a plurality of magnet slots formed in the rotor body, the plurality of magnet slots arranged in a first v-shaped configuration nested within a second v-shaped configuration, wherein a d-axis of the rotor passes through a line of symmetry of the first v-shaped configuration and of the second v-shaped configuration,
- a trapezoidal slot formed in the rotor body in a middle portion of the second v-shaped configuration,
- a plurality of branches formed in the rotor body, each branch of the plurality of branches positioned between adjacent magnet slots, the adjacent magnet slots comprising a first magnet slot of the first v-shaped configuration and a second magnet slot of the second v-shaped configuration, wherein a depth of each branch is 32%-40% of a first distance perpendicularly spanning the depth of the first magnet slot, the second magnet slot, and the branch, and
- a plurality of triangular slots formed in the rotor body, each of the plurality of triangular slots positioned between adjacent magnet slot clusters;
- and
- a plurality of permanent magnets, wherein each of the plurality of magnet slots in each of the plurality of magnet slot clusters contains one of the plurality of permanent magnets;
- wherein a first magnet of the plurality of permanent magnets in the first magnet slot of the first v-shaped configuration of one of the plurality of magnet slot clusters has a width to depth ratio of 1.5 to 2, and wherein the width of the first magnet is at least 55% of a second distance spanning from the d-axis to an outer circumference of the rotor along a longitudinal axis of the first magnet;
- and
- wherein a second magnet of the plurality of magnetized permanent magnets in the second magnet slot of the second v-shaped configuration of the one of the plurality of magnet slot clusters has a width to depth ratio of 3 to 3.5, and wherein the width of the second magnet is at least 45% of a third distance spanning from the d-axis to the outer circumference of the rotor along a longitudinal axis of the second magnet.
10 more elements
An interior permanent magnet electrical machine comprising:
- a stator comprising a plurality of stator teeth separated by a plurality of gaps;
- a rotor positioned within the stator, the rotor comprising:
- a rotor body comprised of magnetically permeable material configured for conducting magnetic flux,
- a plurality of magnet slot clusters, each comprising:
- a plurality of magnet slots formed in the rotor body, the plurality of magnet slots arranged in a first v-shaped configuration nested within a second v-shaped configuration, wherein a d-axis of the rotor passes through a line of symmetry of the first v-shaped configuration and of the second v-shaped configuration,
- a plurality of branches formed in the rotor body, each branch of the plurality of branches positioned between adjacent magnet slots, the adjacent magnet slots comprising a first magnet slot of the first v-shaped configuration and a second magnet slot the second v-shaped configuration,
- wherein a thickness of each branch is 32%-40% of a first distance spanning the first magnet slot and the second magnet slot;
- and
- a plurality of magnetized permanent magnets, wherein each of the plurality of magnet slots in each of the plurality of magnet slot clusters contains one of the plurality of magnetized permanent magnets, wherein each magnet of the plurality of magnetized permanent magnets is positioned such that a longitudinal axis of the magnet forms an angle of 0.8 to 1.0 radians relative to the d-axis.
6 more elements
Dependencies are inferred from the claim text.