Patent JPS60219640A successfully refreshed from Google Patents.
US6047461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for permanent magnet excited, high-speed electric rotary machine, manufacturing method of the same and electric rotary machine including the same
Assignee: Hitachi Ltd
•
Filing: 1998-09-03
•
Granted: 2000-04-11
•
Expires: 2018-09-03
Abstract
Abstract A manufacturing method of a rotor for a permanent magnet-excited, high-speed electric rotary machine according to the present invention comprises, covering an outer circumferential surface of at least one permanent magnet by a fiber-reinforced plastic protection cover with prestress compressing in radial direction; inserting a steel sleeve into the at least one permanent magnet to form a permanent magnet assembly; preparing at least one permanent magnet assembly; inserting a rotor shaft into the steel sleeve while applying hydraulic pressure to an inner circumferential surface of the steel sleeve of the prepared at least one permanent magnet assembly to expand the steel sleeve; and then removing the hydraulic pressure to tight fit the at least one permanent magnet assembly onto the rotor shaft.
Inventors
- 👤 Haruo Miura
- 👤 Kazuki Takahashi
- 👤 Hideo Nishida
- 👤 Naohiko Takahashi
- 👤 Yasuo Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:08
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K15/00; H02K15/02; H02K15/03; H02K21/00; H02K21/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
114 words
A manufacturing method of a rotor for a permanent magnet-excited, high-speed electric rotary machine, comprising: covering an outer circumferential surface of at least one permanent magnet by a protection cover with prestress compressing in radial direction; inserting a steel sleeve into the at least one permanent magnet to form a permanent magnet assembly; preparing at least one permanent magnet assembly; inserting a rotor shaft into the steel sleeve while applying hydraulic pressure to an inner circumferential surface of the steel sleeve of the prepared at least one permanent magnet assembly to expand the steel sleeve; and removing the hydraulic pressure to tight fit the at least one permanent magnet assembly onto the rotor shaft.
Claim 2
Dependent Claim
114 words
A manufacturing method of a rotor for a permanent magnet-excited, high-speed electric rotary machine, comprising: covering an outer circumferential surface of at least one permanent magnet by a protection cover with prestress compressing in radial direction; inserting a steel sleeve into the at least one permanent magnet to form a permanent magnet assembly; preparing at least one permanent magnet assembly; inserting a rotor shaft into the steel sleeve while applying hydraulic pressure to an inner circumferential surface of the steel sleeve of the prepared at least one permanent magnet assembly to expand the steel sleeve; and removing the hydraulic pressure to tight fit the at least one permanent magnet assembly onto the rotor shaft.
Claim 3
Dependent Claim
43 words
The manufacturing method of a rotor according to claim 1, further comprising a step of cutting away a hydraulic pressure introducing passage of the steel sleeve for applying hydraulic pressure to an inner circumferential surface of the steel sleeve after removing hydraulic pressure.
Claim 4
Dependent Claim
34 words
The manufacturing method of a rotor according to claim 1, further comprising a step of disposing end rings on both ends of the at least one permanent magnet upon insertion of the steel sleeve.
Claim 5
Dependent Claim
22 words
The manufacturing method of a rotor according to claim 1, wherein said insertion of the rotor shaft is conducted by hydraulic pressure.
Claim 6
Dependent Claim
41 words
The manufacturing method of a rotor according to claim 1, wherein said step of covering the cylindrical permanent magnet with the protection cover includes fitting said at least one cylindrical permanent magnet into the protection cover which was made in advance.
Claim 7
Dependent Claim
43 words
The manufacturing method of a rotor according to claim 1, wherein said step of covering the cylindrical permanent magnet with the protection cover includes winding a fiber onto said at least one cylindrical permanent magnet at a predetermined tension while impregnating plastic resin.
Claim 8
Dependent Claim
15 words
A rotary electric machine including a rotor made by the manufacturing method of claim 1.
Claim 9
Dependent Claim
34 words
The manufacturing method of a rotor according to claim 1, wherein said protection cover is made of a carbon fiber-reinforced plastic disposed on the outer circumferential surface of the at least one permanent magnet.
Claim 10
Dependent Claim
68 words
The manufacturing method of a rotor according to claim 1, wherein said protection cover is disposed on the outer circumferential surface of the at least one permanent magnet by winding a carbon fiber impregnated with a resin for adhesion onto the outer circumferential surface of the at least one permanent magnet in an axial direction of the rotor shaft, and then curing said resin in a high-temperature furnace.
Claim 11
Dependent Claim
39 words
The manufacturing method of a rotor according to claim 1, wherein said protection cover includes fibers wound on the outer circumferential surface of the at least one permanent magnet with a predetermined tension while being impregnated by plastic resin.
Claim 12
Dependent Claim
69 words
An assembly process comprising: forming a permanent magnet assembly comprising a cylindrical magnet, a cover disposed to contain an outer circumferential surface of said magnet, and a sleeve disposed to contain an inner circumferential surface of said magnet; and press-fitting a rotor shaft into the permanent magnet assembly by hydraulic pressure so as to expand an inner circumferential surface of the permanent magnet assembly to accommodate said rotor shaft.
Claim 13
Dependent Claim
69 words
An assembly process comprising: forming a permanent magnet assembly comprising a cylindrical magnet, a cover disposed to contain an outer circumferential surface of said magnet, and a sleeve disposed to contain an inner circumferential surface of said magnet; and press-fitting a rotor shaft into the permanent magnet assembly by hydraulic pressure so as to expand an inner circumferential surface of the permanent magnet assembly to accommodate said rotor shaft.
Claim 14
Dependent Claim
27 words
The process according to claim 11, wherein said rotor shaft is hydraulically press fitted into said permanent magnet assembly with an interference ratio not less than 0.003.
Claim 15
Dependent Claim
33 words
The process according to claim 11, wherein said cover is made of a carbon fiber-reinforced plastic to cover the outer circumferential surface of said cylindrical magnet with a prestress compressing in radial direction.
Claim 16
Dependent Claim
31 words
The process according to claim 11, wherein said sleeve is provided with a passage for introducing hydraulic pressure to an inner circumferential surface thereof during said press-fitting of said rotor shaft.
Claim 17
Dependent Claim
26 words
The process according to claim 11, wherein said cover includes fibers wound on said cylindrical magnet with a predetermined tension while being impregnated by plastic resin.
Claim 18
Dependent Claim
60 words
The process according to claim 11, wherein said cover is disposed on the outer circumferential surface of the at least one permanent magnet by winding a carbon fiber impregnated with a resin for adhesion onto the outer circumferential surface of the permanent magnet in an axial direction of the rotor shaft, and then curing said resin in a high-temperature furnace.
Claim 19
Dependent Claim
50 words
An assembly process comprising: forming a permanent magnet assembly comprised of a cylindrical magnet, a cover, and a sleeve; and inserting a rotor shaft into the permanent magnet assembly by hydraulic pressure so as to expand an inner circumferential surface of the permanent magnet assembly to accommodate said rotor shaft.
Claim 20
Dependent Claim
50 words
An assembly process comprising: forming a permanent magnet assembly comprised of a cylindrical magnet, a cover, and a sleeve; and inserting a rotor shaft into the permanent magnet assembly by hydraulic pressure so as to expand an inner circumferential surface of the permanent magnet assembly to accommodate said rotor shaft.
Claim 21
Dependent Claim
27 words
The process according to claim 17, wherein said rotor shaft is hydraulically press fitted into said permanent magnet assembly with an interference ratio not less than 0.003.
Claim 22
Dependent Claim
33 words
The process according to claim 17, wherein said cover is made of a carbon fiber-reinforced plastic to cover the outer circumferential surface of said cylindrical magnet with a prestress compressing in radial direction.
Claim 23
Dependent Claim
30 words
The process according to claim 17, wherein said sleeve is provided with a passage for introducing hydraulic pressure to an inner circumferential surface thereof during insertion of said rotor shaft.
Claim 24
Dependent Claim
60 words
The process according to claim 17, wherein said cover is disposed on the outer circumferential surface of the at least one permanent magnet by winding a carbon fiber impregnated with a resin for adhesion onto the outer circumferential surface of the permanent magnet in an axial direction of the rotor shaft, and then curing said resin in a high-temperature furnace.
References Cited (Backward Citations)
US4625135A
Cited
US4759116A
Cited
US4617726A
Cited
US4930201A
Cited
US4829657A
Cited
US5144735A
Cited
US4910861A
Cited
US4918802A
Cited
US5485045A
Cited
US5500994A
Cited
US5687471A
Cited
GB2299217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-11 | 2003-10-11 | 2004-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-11 | 2007-10-11 | 2008-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-11 | 2011-10-11 | 2012-04-11 | $7700.00 | Window Closed / Lapsed |