US3629024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of insulating armature coils
Assignee: Toshiba Corp
•
Filing: 1970-02-17
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Granted: 1971-12-21
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Expires: 1990-02-17
Abstract
Abstract Straight side portions of an armature coil adapted to be received in armature slots are insulated with insulating tapes containing a relatively hard and nonpliable epoxide resinous composition, while looped end portions are insulated with insulating tapes containing a relatively pliable long chain epoxide resinous composition to avoid damage to the insulation structure due to mechanical stress created during insertion of the coil into armature slots. Not only the interlayer insulation but also the ground insulation is formed by the above described two types of insulation tapes.
Inventors
- 👤 Yoshiaki Kimura
- 👤 Yoshiharu Sano
- 👤 Ryoji Kumazawa
- 👤 Hisayasu Mitsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; H02K3/00; H02K3/32; H02K3/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A method of insulating an armature coil including straight side portions adapted to be received in armature slots of a dynamoelectric machine and looped end portions extending beyond said armature slots, said method comprising the steps of applying a first insulating tape containing a first epoxide resinous composition having relatively high softening point around at least said straight side portions of the coil to form a first interlayer insulation, applying a second insulating tape containing a more flexible epoxide resinous composition than said first epoxide resinous composition around said looped end portions to form a second interlayer insulation contiguous to said first interlayer, the joints between said first and second interlayer insulations being stepped, applying said first insulating tape around said first interlayer insulation and applying said second insulating tape around said second interlayer insulation whereby to form a continuous ground insulation, impregnating said ground insulation with a solventless epoxide resinous composition, and heat cuRing said epoxide resinous compositions.
Claim 2
Dependent Claim
34 words
The method according to claim 1 wherein the softening point of said first epoxide resinous composition is about 30* to 50* C. whereas that of said second epoxide resinous composition is about 80* C.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein comprises a long-chain epoxide composition prepared by reacting epichlorohydrin with an acid composition consisting of dimer and trimer acids.
Claim 4
Dependent Claim
21 words
The method according to claim 4 wherein the quantity of said trimer acid is smaller than that of said dimer acid.
Claim 5
Dependent Claim
40 words
The method according to claim 1 wherein said second epoxide resinous composition comprises a long-chain epoxide composition prepared by reacting epichlorohydrin with an acid component selected from the group consisting of polyazelaic polyanhydride and Alpha , omega -polybutadiene dicarboxylic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |