US4352897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin molded stators
Assignee: Hitachi Ltd
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Filing: 1979-12-14
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Granted: 1982-10-05
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Expires: 1999-12-14
Abstract
Abstract A resin molded stator comprising a stator core and coils as major constituents at least parts of which are molded into one piece by a molding material, said molding material comprising (a) a low-shrink unsaturated polyester resin, (b) a filler having a particle size of 44 mu or less, and (c) a fibrous material having a length of 3 mm or less, in proportions of 15 to 40% by weight of the component (a) and 60 to 85% by weight of a total of the components (b) and (c), and a weight ratio of the component (b) to the component (c) being 3/1 to 30/1, is excellent in crack resistance, moisture resistance and insulating properties.
Inventors
- 👤 Masatsugu Ogata
- 👤 Hirokazu Takasaki
- 👤 Masanori Nemoto
- 👤 Toshikazu Narahara
- 👤 Kenichi Hironaka
- 👤 Tetuo Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:55
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/08; C; C08; C08K; C08K13/00; C08K13/04; C08K3/00; C08L; C08L1/00; C08L29/00; C08L29/02; C08L29/04; C08L67/00; C08L67/02; C08L67/06; C08L77/00; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/425; H02K3/00; H02K3/32
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
A resin molded stator comprising a stator core and coils as major constituents at least parts of which are molded into one piece by a molding material, said molding material comprising (a) a low-shrink unsaturated polyester resin, (b) a filler material consisting of particulate filler having a particle size of 44μ or less, and (c) a fibrous material consisting of fibers having a length of 3 mm or less, in proportions of 15 to 40% by weight of the component (a) and 60 to 85% by weight of a total of the components (b) and (c), and a weight ratio of the component (b) to the component (c) being 3 to 30/1; all of any filler material contained in the molding material consisting of component (b).
Claim 2
Dependent Claim
126 words
A resin molded stator comprising a stator core and coils as major constituents at least parts of which are molded into one piece by a molding material, said molding material comprising (a) a low-shrink unsaturated polyester resin, (b) a filler material consisting of particulate filler having a particle size of 44μ or less, and (c) a fibrous material consisting of fibers having a length of 3 mm or less, in proportions of 15 to 40% by weight of the component (a) and 60 to 85% by weight of a total of the components (b) and (c), and a weight ratio of the component (b) to the component (c) being 3 to 30/1; all of any filler material contained in the molding material consisting of component (b).
Claim 3
Dependent Claim
24 words
A resin molded stator according to claim 1, wherein the molding material has molding shrinkage of 0.5% or less at the time of molding.
Claim 4
Dependent Claim
69 words
A resin molded stator according to claim 1, wherein the low-shrink unsaturated polyester resin comprises (i) a terephthalic acid series unsaturated polyester, (ii) styrene, and (iii) a saturated polyester, in which the proportion of a total of (i) and (ii) is 90 to 70% by weight and the proportion of (iii) is 10 to 30% by weight and a weight ratio of (i) to (ii) is 80/20 to 40/60.
Claim 5
Dependent Claim
19 words
A resin molded stator according to claim 3, wherein the saturated polyester is an isophthalic acid series saturated polyester.
Claim 6
Dependent Claim
34 words
A resin molded stator according to claim 1, wherein the molding material contains 20% by weight or more of aluminum hydroxide as said filler material based on the total weight of the molding material.
Claim 7
Dependent Claim
15 words
A resin molded stator according to claim 1, wherein the fibrous material is glass fiber.
Claim 8
Dependent Claim
41 words
A resin molded stator according to claim 1, 2 or 3, wherein coil end portions, slot portions, terminal portions in addition to a stator core and coils of a stator assembly are molded into one piece by using the molding material.
Claim 9
Dependent Claim
31 words
A resin molded stator according to claim 1, 2 or 3, wherein the outer circumference of a stator core is partially exposed when a stator assembly is molded into one piece.
Claim 10
Dependent Claim
27 words
A resin molded stator according to claim 1, wherein the molding material contains fibrous material consisting of fibers having a length of from 0.5 to 3 mm.
Claim 11
Dependent Claim
33 words
A resin molded stator according to claim 1, wherein the particulate filler contained within said molding material consists of inorganic mineral filler or an admixture of inorganic mineral filler and organic non-fibrous filler.
Claim 12
Dependent Claim
80 words
A resin molded stator according to claim 10, wherein said inorganic mineral filler is selected from the group consisting of calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, alumina, clay, kaoline, talc, diatomaceous earth, mica powder, glass fiber powder, aluminum hydroxide, magnesium hydroxide, hydrated gypsum, zinc borate, borax, silica sand, and mixtures thereof and said organic non-fibrous filler is selected from the group consisting of wood meal, rice hull powder, waste wood powder treated with a resin and cellulose powder.
Claim 13
Dependent Claim
38 words
A resin molded stator according to claim 11, wherein said fibrous material contained within said molding material is selected from the group consisting of glass fibers, carbon fibers, polyvinyl alcohol fibers, nylon fibers, cellulose fibers and mixtures thereof.
References Cited (Backward Citations)
US3923927A
Cited
US4128527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |