EP0459355A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Permanent magnet type rotor
Assignee: Hitachi Ltd
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Filing: 1991-05-27
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Granted: —
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Expires: 2011-05-27
Abstract
Abstract A permanent magnet type rotor is disclosed which comprises a cylindrical core member (4), a plurality of arcuate permanent magnet segments (3) disposed around an outer periphery of the core member (4) and a non-magnetic sleeve (2) disposed around outer peripheries of the arcuate permanent magnet segments. The magnet segments (3) having the same pole are brought into contact with each other. Circumferential direction pressing members (14) are interposed between the magnet segments having the different poles. It is thus possible to enhance the arrangement precision of the magnet segments (3) and a balance precision during the rotation to thereby stabilize the magnetic distribution characteristics. <IMAGE>
Inventors
- 👤 Hisanori Toyoshima
- 👤 Fumio Joraku
- 👤 Yoshitaro Ishii
- 👤 Mitsuhisa Kawamata
- 👤 Kunio Miyashita
- 👤 Haruo Koharagi
- 👤 Kazuo Tahara
- 👤 Takeshi Abe
- 👤 Teruyuki Miyata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 02:56
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K1/28; H02K15/00; H02K15/12; H02K21/00; H02K21/12; H02K21/14
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
82 words
A permanent magnet type rotor comprising: a cylindircal core member (4); a plurality of arcuate permanent magnet segments (3) disposed around an outer circumferential periphery of said core member (4); and a non-magnetic sleeve (2) disposed around outer peripheries of the plurality of permanent magnet segments (3); said arcuate permanent magnet segments (3) which have the same pole being in contact with each other; and circumferential direction pressing members (14) interposed between the arcuate permanent magnet segments (3) having the different poles.
Claim 2
Dependent Claim
20 words
The rotor according to claim 1, wherein said plurality of arcuate permanent magnet segments (3) form a single magnetic pole.
Claim 3
Dependent Claim
19 words
The rotor according to claim 1, wherein said circumferential direction pressing members (14) are made of a die-casting material.
Claim 4
Dependent Claim
32 words
The rotor according to claim 1, wherein convex portions (13) disposed between the different poles of said plurality of arcuate permanent magnet segments (3) are formed integrally with said core member (4).
Claim 5
Dependent Claim
17 words
The rotor according to claim 1, wherein said circumferential direction pressing members (14) comprise elastic members (17).
Claim 6
Dependent Claim
27 words
The rotor according to claim 5, wherein said elastic members (17) are interposed in every space between the arcuate permanent magnet segments (3) having the different poles.
Claim 7
Dependent Claim
36 words
The rotor according to claim 6, wherein a plurality of convex or concave portions (11) facing the spaces between the arcuate permanent magnet segments (3) forming the different poles are formed in said core member (4).
Claim 8
Dependent Claim
27 words
The rotor according to claim 7, wherein said convex or concave portions (11) of said core member (4) are formed for positioning said permanent magnet segments (3).
Claim 9
Dependent Claim
37 words
The rotor according to claim 7, wherein tongue portions (13) projecting inwardly toward the elastic members interposed in the spaces between said arcuate permanent magnet segments (3) are engaged with said concave portions of said core member.
Claim 10
Dependent Claim
162 words
A permanent magnet type rotor comprising: a cylindrical core member (4); a plurality of arcuate permanent magnet segments (3) disposed around an outer circumferential periphery of said core member (4); a non-magnetic sleeve (2) disposed around outer peripheries of said arcuate permanent magnet segments (3); end plates (5, 6) provided at end faces of said sleeve (2); and positioning members (13) disposed between the arcuate permanent magnet segments (3) having different poles for retaining spaces between the arcuate permanent magnet segments (3) having different poles; the arcuate permanent magnet segments (3) having the same pole being in contact with each other; wherein a plurality of molten material pouring ports (9) are formed in said end plates (5, 6), and a plurality of grooves (11) each extending in the axial direction are formed in said core member, said pouring ports (9) facing said grooves (11) of said core member and/or the spaces between the arcuate permanent magnet segments (3) having the different poles.
Claim 11
Dependent Claim
23 words
The rotor according to claim 10, wherein said positioning members (13) comprise convex portions formed on said outer periphery of said core member.
Claim 12
Dependent Claim
26 words
The rotor according to claim 10, wherein said grooves (11) of said core member (4) have a semicircular shape in cross section and are equidistantly formed.
Claim 13
Dependent Claim
55 words
The rotor according to claim 10, said permanent magnet segments (3) are composed of two permanent magnet segments to be an N-pole and two permanent magnet segments to be an S-pole, said permanents magnet segments being disposed around the outer periphery of said core member (4) in the order of N-, N-, S- and S-poles.
Claim 14
Dependent Claim
58 words
The rotor according to claim 10, wherein said permanent magnet segments (3) are composed of four permanent magnet segments to be an N-pole and four permanent magnet segments to be an S-pole, said permanent magnet segments being disposed around the outer pheriphery of said core member (4) so that the same pole of N- and S-poles is continued.
Claim 15
Dependent Claim
182 words
A permanent magnet type rotor comprising: a cylindrical core member (4); a plurality of arcuate permanent magnet segments (3) disposed around an outer circumferential periphery of said core member (4); a non-magnetic sleeve (2) disposed around outer peripheries of said arcuate permanent magnet segments;(3); end plates (5, 6) provided at end faces of said sleeve (2); and said arcuate permanent magnet segments (3) being composed of two permanent magnet segments to be an N-pole and two permanent magnet segments to be an S-pole, said permanent magnet segments being arranged around said outer circumferential periphery of said core member (4) in the order of N-, N-, S- and S-poles, positioning convex portions (13) formed on the outer circumferential periphery of said core member (14) being located between the N-pole and S-pole of said permanent magnet segments (3) to thereby retain spaces therebetween, a die-casting material being filled through molten material pouring ports (9) formed in said end plates (5, 6) into said spaces to thereby contact the permanent magnet segments (3) having the same poles of the N-pole and S-pole with each other.
Claim 16
Dependent Claim
45 words
The rotor according to claim 15, wherein four grooves (11) extending in the axial direction are formed in the outer periphery of said core member (4), and the molten material pouring ports (9) are formed to face the grooves (11) of said core member (4).
Claim 17
Dependent Claim
27 words
The rotor according to claim 16, wherein said grooves (11) formed in the outer periphery of said core member (4) have a semicircular shape in cross section.
Claim 18
Dependent Claim
31 words
The rotor according to claim 15, wherein an annular groove is formed in each of said end plates and said molten material pouring ports are in communication with the annular grooves.
Claim 19
Dependent Claim
119 words
A permanent magnet type rotor comprising: a cylindrical core member;(4); a plurality of arcuate permanent magnet segments (3) disposed around an outer circumferential periphery of said core member (4); a non-magnetic sleeve (2) disposed around outer peripheries of said plurality of permanent magnet segments; (3); end plates (5, 6) provided at end faces of said sleeve (2); and an annular groove and a plurality of molten material pouring ports (9) in fluid communication with said annular groove being formed in said end plates (5, 6), and a die-casting material being filled through said pouring ports (9) for integral structure; wherein a balance correcting portion (28) is formed on said end face and/or the outer periphery by said die-casting material.
Claim 20
Dependent Claim
21 words
The rotor according to claim 19, wherein said balance correcting portion (28) is formed on each end face of said rotor.
Claim 21
Dependent Claim
19 words
The rotor according to claim 19, wherein said balance correcting portion (28) is in the form of a ring.
References Cited (Backward Citations)
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