PERMANENT MAGNET TYPE ROTATING ELECTRICAL MACHINE AND ELECTRIC POWER STEERING DEVICE
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Accused Products
Abstract
A permanent magnet type rotating electric machine includes: a rotor including a rotor core having a polygonal shape and a plurality of permanent magnets; and a stator including a stator core and armature windings, in which, when the number of poles is M, the number of slots is N, M permanent magnets are sequentially numbered from first to M-th in a circumferential direction, and a positional shift amount in the circumferential direction from a corresponding one of equiangularly arranged reference positions, each being at the same radial distance from a center of a rotating shaft, for an i-th (i=1, 2, . . . , M) permanent magnet is hi, M unit vectors in total, each being in an angular direction of 2πN(i−1)/M (rad), are defined, and a sum of M vectors obtained by multiplying the unit vectors respectively by the positional shift amount hi is smaller than a maximum value of an absolute value of the positional shift amount hi.
44 Citations
36 Claims
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1-13. -13. (canceled)
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14. A permanent magnet type rotating electric machine, comprising:
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a rotor including a rotor core and a plurality of permanent magnets; and a stator including a stator core and armature windings, wherein, when a number of poles is M (M is an integer), a number of slots is N (N is an integer), M permanent magnets are sequentially numbered from first to M-th in a circumferential direction, and a positional shift amount in the circumferential direction from a corresponding one of equiangularly arranged reference positions, each being at the same radial distance from a center of a rotating shaft, for an i-th (i=1, 2, . . . , M) permanent magnet is hi(i=1, 2, . . . , M) (including a sign), M unit vectors in total, each being in an angular direction of 2π
N(i−
1)/M (rad), are defined, and a sum of M vectors obtained by multiplying the unit vectors respectively by the positional shift amount hi is smaller than a maximum value of an absolute value of the positional shift amount hi. - View Dependent Claims (15, 16, 22, 23, 24, 25, 26)
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17. A permanent magnet type rotating electric machine, comprising:
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a rotor including a rotor core and a plurality of permanent magnets; and a stator including a stator core and armature windings, wherein, when a number of poles is M (M is an integer), a number of slots is N (N is an integer), M permanent magnets are sequentially numbered from first to M-th in a circumferential direction, and a shape deviation amount in the circumferential direction for an i-th (i=1, 2, . . . , M) permanent magnet is ci (i=1, 2, . . . , M) (including a sign), M unit vectors in total, each being in an angular direction of 2π
N(i−
1)/M (rad), are defined, and a sum of M vectors obtained by multiplying the unit vectors respectively by the shape deviation amount ci is smaller than a maximum value of an absolute value of the shape deviation amount ci. - View Dependent Claims (18, 19, 20, 27, 28, 29, 30, 31)
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21. A permanent magnet type rotating electric machine, comprising:
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a rotor including a rotor core having a polygonal shape and a plurality of permanent magnets; and a stator including a stator core and armature windings, wherein all the plurality of permanent magnets have circumferential positional shifts of the plurality of permanent magnets from reference positions, each being a center of each side of the polygonal shape, in the same direction. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification