Interior permanent magnet synchronous motor
First Claim
1. An interior permanent magnet synchronous motor comprising:
- a stator including a stator core provided with a plurality of magnetic pole sections having windings of at least one phase wound thereon;
a rotor having p pole pairs (p;
a positive integer of 1 or more);
said rotor including a shaft and a rotor core fixed on said shaft;
said rotor core having 2p permanent magnets incorporated therein in a manner to be spaced from each other at intervals in a peripheral direction thereof;
said 2p permanent magnets constituting 2p permanent magnet magnetic pole sections formed on an outer periphery of said rotor core;
said rotor being formed with 2p magnetic salient pole sections so as to interpose said permanent magnet magnetic pole section therebetween;
said 2p magnetic salient pole sections consisting of a first and a second groups of magnetic salient pole sections, said first group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of the magnetic salient pole sections of a second group is interposed between two adjacent magnetic salient pole sections and said second group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of magnetic salient pole sections of the first group is interposed between two adjacent magnetic salient pole sections;
wherein an open angle α
1 of said p magnetic salient pole sections of said first group is set smaller than an open angle α
2 of said p magnetic salient pole sections of said second group;
said open angles α
1 and α
2 are determined to satisfy the following expressions;
α
2−
α
1≈
2β
−
(2n−
1)τ
s wherein n is a natural number, β
is an angle between two salient pole section virtual center lines CL1, CL2 which extend from the center of said shaft through the center of said two adjacent magnetic salient pole sections, and τ
s is the slot pitch of said stator core.
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Accused Products
Abstract
An interior permanent magnet synchronous motor wherein cogging torque and torque pulsation during feeding of electricity can be both restrained. 2p (p: a positive integer of 1 or more) magnetic salient pole sections consists of two groups of magnetic salient pole sections, a first group of which consists of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while having one magnetic salient pole section of a second group interposed between each of two adjacent magnetic salient pole sections, and the second group of which consists of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while having one magnetic salient pole section of the first group interposed between each of two adjacent magnetic salient pole sections. The open angle α 1 of the p magnetic salient pole sections of the first group is smaller than the open angle α 2 of the p magnetic salient pole sections of the second group. Then the open angles α 1 and α 2 are set to satisfy the expression α2−α1≈2β−(2n−1)τs. n is a natural number. β is an angle between virtual center lines CL1 and CL2 of two adjacent magnetic salient pole sections which extend from the center of the shaft through the center of each salient magnetic pole sections. τ s is the slot pitch of the stator core.
49 Citations
16 Claims
-
1. An interior permanent magnet synchronous motor comprising:
-
a stator including a stator core provided with a plurality of magnetic pole sections having windings of at least one phase wound thereon;
a rotor having p pole pairs (p;
a positive integer of 1 or more);
said rotor including a shaft and a rotor core fixed on said shaft;
said rotor core having 2p permanent magnets incorporated therein in a manner to be spaced from each other at intervals in a peripheral direction thereof;
said 2p permanent magnets constituting 2p permanent magnet magnetic pole sections formed on an outer periphery of said rotor core;
said rotor being formed with 2p magnetic salient pole sections so as to interpose said permanent magnet magnetic pole section therebetween;
said 2p magnetic salient pole sections consisting of a first and a second groups of magnetic salient pole sections, said first group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of the magnetic salient pole sections of a second group is interposed between two adjacent magnetic salient pole sections and said second group consisting of p magnetic salient pole sections arranged so as to be spaced at equal intervals in the peripheral direction while each of magnetic salient pole sections of the first group is interposed between two adjacent magnetic salient pole sections;
wherein an open angle α
1 of said p magnetic salient pole sections of said first group is set smaller than an open angle α
2 of said p magnetic salient pole sections of said second group;
said open angles α
1 and α
2 are determined to satisfy the following expressions;
α
2−
α
1≈
2β
−
(2n−
1)τ
swherein n is a natural number, β
is an angle between two salient pole section virtual center lines CL1, CL2 which extend from the center of said shaft through the center of said two adjacent magnetic salient pole sections, and τ
s is the slot pitch of said stator core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 16)
-
-
8. An interior permanent magnet synchronous motor comprising:
-
a stator including a stator core provided with a plurality of magnetic pole sections having windings of three phases wound thereon;
a rotor having four pole pairs said rotor including a shaft and a rotor core fixed on said shaft;
said rotor core having eight permanent magnets incorporated therein in a manner to be spaced from each other at intervals in a peripheral direction thereof;
said eight permanent magnets each constituting eight permanent magnet magnetic pole sections formed on an outer periphery of said rotor core;
said rotor being formed with eight magnetic silent pole sections so as to interpose said permanent magnet magnetic pole section therebetween;
said eight permanent magnet magnetic pole sections consisting of a first and a second groups of permanent magnet magnetic pole sections;
said first group consisting of four permanent magnet magnetic pole sections arranged to be spaced at equal intervals in the peripheral direction interposing one permanent magnet magnetic pole section of said second group between each adjacent two permanent magnet magnetic pole sections of the first group;
said second group consisting of four permanent magnet magnetic pole sections arranged to be spaced at equal intervals in the peripheral direction interposing one permanent magnet magnetic pole section of said first group between each adjacent two permanent magnet magnetic pole sections of the second group;
said eight magnetic salient pole sections consisting of a first and a second groups of the magnetic salient pole sections;
said first group of magnetic salient pole sections consisting of four magnetic salient pole sections arranged to be spaced at equal intervals in the peripheral direction interposing one magnetic salient pole section of said second group between each adjacent two magnetic salient pole sections of said first group;
said second group of magnetic salient pole sections consisting of four magnetic salient pole sections arranged to be spaced at equal intervals in the peripheral direction interposing one magnetic salient pole section of said first group between each adjacent two magnetic salient pole sections of said second group;
wherein the open angle α
1 of the four magnetic salient pole sections of said first group is smaller than the open angle α
2 of the four magnetic salient pole sections of said second group;
wherein said open angle α
2 is determined within the range of 12.9°
≦
α
2≦
17.1° and
said open angle α
1 is determined within the range of 5.4°
≦
α
1≦
9.6°
, when the slot pitch of said stator core is 7.5° and
the slot opening is 2.1°
. - View Dependent Claims (9, 10, 11)
-
Specification