GB1590241A - Control circuits for polyphase motors - Google Patents
Control circuits for polyphase motors Download PDFInfo
- Publication number
- GB1590241A GB1590241A GB1806/78A GB180678A GB1590241A GB 1590241 A GB1590241 A GB 1590241A GB 1806/78 A GB1806/78 A GB 1806/78A GB 180678 A GB180678 A GB 180678A GB 1590241 A GB1590241 A GB 1590241A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- parts
- peroxide
- composition
- curable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Motor And Converter Starters (AREA)
Abstract
To have better control of the short circuit problem occurring in connection with the reversal of direction of rotation of controllable three-phase asynchronous motors, and thus to be able to change the direction of rotation without prior decrease in the speed of rotation, the reversal circuit (30) is associated with a blocking device (43) which allows reversal only after the inverter switching elements arranged in series have been extinguished. In addition, the frequency of the frequency generator (9) is kept proportional to the regulated direct voltage (U1). There is no destruction of the switching elements since the reversal process in each case virtually coincides with an extinction process. <IMAGE>
Description
WHAT WE CLAIM IS:
1. A thermoplastic composition which comprises: 100 to 5 parts by weight of (A) a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100 to 40 parts by weight of (a) peroxide-curable olefin copolymer rubber, 0 to 60 parts by weight of (b) a peroxide-decomposing olefin plastic, (wherein the sum of (a) and (b) is 100 parts by weight), and 5 to 100 parts by weight of at least one of (c) a peroxide-non-curable hydrocarbon rubber-like material and (d) a mineral oil type softener; and 0 to 95 parts by weight of (B) an olefin plastic; with the proviso that the sum of component (b) and component (B) are not less than 5 parts by weight referred to 100 parts by weight of the total composition.
2. A thermoplastic composition according to claim 1. wherein component (A) comprises a partially cured elastomer composition obtained by dynamic heat-treatment in the presence of an organic peroxide of a mixture of 90 to 60 parts by weight of (a) a peroxide-curable olefin copolymer rubber, 10 to 60 parts by weight of (b) a peroxidedecomposing olefin plastic, (wherein the sum of components (a) and (b) is 100 parts by weight, and 5 to 100 parts by weight of at least one of (c) a peroxide-non-curable hydrocarbon rubber-like material and (d) a mineral oil type softener.
3. A thermoplastic composition according to claim 1, which comprises 100 parts by weight of the total composition of (A) a partially cured elastomer composition obtained by dynamic heat-treatment in the presence of an organic peroxide of a mixture of 100 to 50 parts by weight of (a) a peroxide-curable olefin copolymer rubber, 0 to 50 parts by weight of (b) a peroxide-decomposing olefin plastic, (wherein the sum of components (a) and (b) is 100 parts by weight), and 5 to 100 parts by weight of at least one of (c) a peroxide-non-curable hydrocarbon rubber-like material and (d) a mineral oil type softener; and 0 to 100 Parts by weight of (B) and an olefin plastic, with the proviso that the sum of components (b) and (B) are not less than 5 parts by weight referred to 100 parts by weight of the total composition.
4. A thermoplastic composition according to claim 1, which comprises: 5 to 95 parts by weight of (Al a partially cured elastomer composition obtained by dynamic heat-treatment in the presence of an organic peroxide of a mixture of 90 to 50 parts by weight of (a) a peroxide-curable olefin copolymer rubber.
10 to 50 parts by weight of (b) a peroxide decomposing olefin plastic, (wherein the sum of components (a) and (b) is 100 parts by weight), and 5 to 50 parts by weight of (c) a peroxide-non-curable hydrocarbon rubber-like material and/or (d) a mineral oil type softener; and 95 to 5 parts by weight of (B) an olefin plastic.
5. A composition according to any one of claims 1 to 4 wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene copolymer rubber.
6. A composition according to any one of claims 1 to 4 wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene-non-conjugated diene copolymer rubber.
7. A composition according to claim 6 wherein the ethylene-propylene-non-conjugated diene copolymer rubber is ethylene-propylene-ethylidene norbornene copolymer rubber.
8. A composition according to any one of claims 1 to 7 wherein the Mooney viscosity My1+4 (100"C) of the peroxide-curable olefin copolymer rubber (a) is in the range 40 to 80.
9. A composition according to any one of claims 1 to 8 wherein the peroxidedecomposing olefin plastic (b) is isotactic polypropylene.
10. A composition according to any one of claims 1 to 8 wherein the peroxidedecomposing olefin plastic (b) is propylene-alpha-olefin copolymer.
11. A composition according to any one of claims of 1 to 10 wherein Melt Index (ASTM
D-1238-65T, 230"C) of the peroxide-decomposing olefin plastic (b) is from 5 to 20.
12. A composition according to any one of claims 1 to 11 wherein the peroxide-noncurable hydrocarbon rubbery material (c) is polyisobutylene.
13. A composition according to any one of claims 1 to 11 wherein the peroxide-noncurable hydrocarbon rubbery material (c) is butyl rubber.
14. A composition according to any one of claims 1 to 13, wherein the peroxide-noncurable hydrocarbon rubbery material (c) is mixed in an amount of 5 to 20 parts by weight with 100 parts by weight in total of the component (a) and the component (b).
15. A composition according to any one of claims 1 to 14 wherein the mineral oil type softener (d) is mixed in an amount of 10 to 40 parts by weight with 100 parts by weight in total of the component (a) and the component (b).
16. A composition according to any one of claims 1 to 15, wherein the Melt Index
(ASTM D-1238-65T, 1900C; for propylenic polymer, 230"C) of the olefin plastic (B) is from
10 to 50.
17. A method of producing a thermoplastic composition as defined in claim 1 which comprises dynamically heat-treating, in the presence of an organic peroxide, a mixture of 100 to 40 parts by weight of (a) a peroxide-curable olefin copolymer rubber, 0 to 60 parts by weight of (b) a peroxide-decomposing olefin plastic (wherein the sum of component (a) and component (b) is 100 parts by weight), and 5 to 100 parts by weight of at least one member of (c) a peroxide-non-curable hydrocarbon rubbery material and (d) a mineral oil type softener, to obtain a thermoplastic elastomer composition (A); and then, homogeneously blending 100 to 5 parts of composition (A) and 0 to 95 parts by weight of (B) an olefin plastic; wherein the sum of the component (b) and the component (B) account for not less than 5 parts by weight to 100 parts of the final product.
18. A method according to claim 17, wherein the organic peroxide is 1,3-bis(tert.-butyl peroxyisopropyl)benzene.
19. A method according to either of claims 17 and 18, wherein the organic peroxide is used in an amount of 0.05 to 1.0 % by weight based on the mixture to be heat-treated.
20. A method according to any one of claims 17 to 19, wherein the mixture is heat-treated in the presence of an organic peroxide and divinyl benzene.
21. A method according to claim 20, wherein divinyl benzene is used in an amount of 0.1 to 2 % by weight based on the mixture to be heat-treated.
22. A method according to claim 20, wherein the organic peroxide is added to the mixture as a dispersion in divinyl benzene.
23. A method according to any one of claims 20 to 22 wherein the peroxide-curable olefin copolymer rubber (a is used in an amount of 90 to 40 parts by weight, and the peroxide-decomposing olefin plastic (b) is used in an amount of 10 to 60 parts by weight, the sum of these components being 100 parts by weight.
24. A method according to anyone of claims 17 to 23 wherein the temperature of the heat-treatment is 150 to 2800C.
25. A method of producing a foamed produce of a thermoplastic elastomer comprising: heating to melt a foamable composition comprising a thermoplastic composition as defined in claim 1 with a decomposition type foaming agent, and molding the molten composition while foaming.
26. A method of producing a foamed product of a thermoplastic composition according to claim 25 wherein the thermoplastic composition comprises a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 90 to 50 parts by weight of (a) a peroxide-curable olefin copolymer rubber, 10 to 50 parts by weight of (b) a peroxide-decomposing olefin plastic, (wherein the sum of component (a) and component (b) is 100 parts by weight), and 5 to 50 parts by weight of at least one member of (c) a peroxide-non-curable hydrocarbon rubbery material, and (d) a mineral oil type softener.
27. A method of producing a foamed product of a thermoplastic composition according to claim 25 wherein the thermoplastic composition comprises: 5 to 95 parts by weight of a partially cured elastomer composition (A) obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100 to 50 parts by weight of (a) a peroxide-curable olefin copolymer rubber, 0 to 50 parts by weight of (b) a peroxide-decomposing olefin plastic, (wherein the sum of component (a) and component (b) is 100 parts by weight), and 5 to 100 parts by weight of at least one of (c) a peroxide-non-curable hydrocarbon rubbery material, and (d) a mineral oil type softener, and 95 to 5 parts by weight of an (B) olefin plastic.
28. A method according to any one of claims 25 to 27, wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene copolymer rubber.
29. A method according to any one of claims 25 to 27, wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene-non-conjugated diene copolymer rubber.
30. A method according to claim 29, wherein the ethylene-propylene-non-conjugated diene copolymer rubber is ethylene-propylene-ethylidene norbornene copolymer rubber.
31. A method according to any one of claims 25 to 30 wherein the Mooney viscosity ML1+4(100 C) of the peroxide-curable olefin copolymer rubber (a) is in the range of 40 to 80.
32. A method according to any one of claims 25 to 31, wherein the peroxidedecomposing olefin plastic (b) is isotactic polypropylene.
33. A method according to any one of claims 25 to 31 wherein the peroxidedecomposing olefin plastic (b) is propylene-alpha-olefin copolymer.
34. A method according to any one of claims 25 to 33 wherein the Melt Index (ASTM
D-1238-65T, 230"C) of the peroxide-decomposing olefin plastic (b) is from 5 to 20.
35. A method according to any one of claims 25 to 34, wherein the organic peroxide is 1,3-bis(tert.-butyl peroxyisopropyl)benzene.
36. A method according to any one of claims 25 to 35, wherein the organic peroxide is used in an amount of 0.05 to 1.0 % by weight based on the mixture to be heat-treated.
37. A method according to anyone of claims 25 to 36, wherein the mixture is heat-treated not only in the presence of organic peroxide but also in the presence of divinyl benzene.
38. A method according to claim 37, wherein divinyl benzene is used in an amount of 0.3 to 1.0 % by weight of the mixture to be heat-treated.
39. A method according to any one of claims 25 to 38, wherein the peroxide-noncurable hydrocarbon rubbery material (c) is polyisobutylene.
40. A method according to anyone of claims 25 to 38, wherein the peroxide-non-curable hydrocarbon rubbery material (c) is butyl rubber.
41. A method according to any one of claims 25 to 40, wherein the peroxide-noncurable hydrocarbon rubbery material (c) is mixed in an amount of 5 to 15 parts by weight with 100 parts by weight in total of component (a) and component (b).
42. A method according to any one of claims 25 to 41, wherein the mineral oil type softener (d) is mixed in an amount of 10 to 30 parts by weight with 100 parts by weight in total of the component (a) and the component (b).
43. A method according to any one of claims 25 to 42 wherein the decomposition type foaming agent (B) is azodicarbonamide.
44. A method according to any one of claims 25 to 43, wherein the decomposition type foaming agent (B) is used in an amount of 0.01 to 5 % by weight with 100 parts by weight of the elastomer composition (A).
45. A method according to any one of claims 25 to 44, wherein the expansion ratio of the foamed product of the thermoplastic elastomer is 1.05 to 1.3.
46. A method according to any one of claims 25 to 44 wherein the expansion ratio of the foamed product of the thermoplastic elastomer is 1.4 to 3.0.
47. A method according to any one of claims 25 to 46, wherein almost all the cells of the foamed product are isolated cells.
48. A thermoplastic composition as defined in claim 1 substantially as herein described.
49. A thermoplastic composition as defined in claim 1 substantially as herein described with reference to the Examples.
50. A method of producing a thermoplastic composition as defined in claim 17 substantially as herein described.
51. A method of producing a thermoplastic composition as defined in claim 17 substantially as herein described with reference to the Examples.
52. A thermoplastic composition whenever prepared by a method claimed in any one of claims 17 to 24, 50 and 51.
53. A method of producing a foamed product of a thermoplastic elastomer as defined in claim 25 substantially as herein described.
54. A method of producing a foamed product of a thermoplastic elastomer as defined in claim 25 substantially as herein described with reference to the Examples.
55. A foamed product of a thermoplastic elastomer whenever prepared by a method claimed in any one of claims 25 to 47, 53 and 54.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (1)
- **WARNING** start of CLMS field may overlap end of DESC **.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2703309A DE2703309C2 (en) | 1977-01-27 | 1977-01-27 | Arrangement for controlling the speed and direction of rotation of a three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1590241A true GB1590241A (en) | 1981-05-28 |
Family
ID=5999682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1806/78A Expired GB1590241A (en) | 1977-01-27 | 1978-01-17 | Control circuits for polyphase motors |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5393320A (en) |
| AU (1) | AU519621B2 (en) |
| CH (1) | CH622137A5 (en) |
| DE (1) | DE2703309C2 (en) |
| DK (1) | DK580377A (en) |
| FR (1) | FR2379191A1 (en) |
| GB (1) | GB1590241A (en) |
| NO (1) | NO141874C (en) |
| SE (1) | SE426003B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4013967A1 (en) * | 1990-04-30 | 1991-11-07 | Retronic Prozess Systemtechnik | CIRCUIT ARRANGEMENT FOR AN ASYNCHRONOUS MOTOR |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4300077A (en) * | 1979-12-17 | 1981-11-10 | Astro Dynamics, Inc. | Trans-synchronous motor apparatus and method |
| JPH0773426B2 (en) * | 1984-11-09 | 1995-08-02 | 株式会社東芝 | Power converter control device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK130099B (en) * | 1968-03-16 | 1974-12-16 | Danfoss As | Control circuit for an AC motor. |
| US3691439A (en) * | 1971-01-28 | 1972-09-12 | Danfoss As | Control arrangement for a three phase motor with intermediate d.c. regulation |
| US3670224A (en) * | 1971-02-18 | 1972-06-13 | Danfoss As | Speed and voltage control means for an alternating-current motor, particularly a polyphase induction motor |
-
1977
- 1977-01-27 DE DE2703309A patent/DE2703309C2/en not_active Expired
- 1977-12-27 DK DK580377A patent/DK580377A/en not_active Application Discontinuation
- 1977-12-28 CH CH1623577A patent/CH622137A5/en not_active IP Right Cessation
-
1978
- 1978-01-17 GB GB1806/78A patent/GB1590241A/en not_active Expired
- 1978-01-19 NO NO780194A patent/NO141874C/en unknown
- 1978-01-26 AU AU32766/78A patent/AU519621B2/en not_active Expired
- 1978-01-26 FR FR7802187A patent/FR2379191A1/en active Granted
- 1978-01-26 JP JP780878A patent/JPS5393320A/en active Granted
- 1978-01-26 SE SE7800956A patent/SE426003B/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4013967A1 (en) * | 1990-04-30 | 1991-11-07 | Retronic Prozess Systemtechnik | CIRCUIT ARRANGEMENT FOR AN ASYNCHRONOUS MOTOR |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5393320A (en) | 1978-08-16 |
| NO780194L (en) | 1978-07-28 |
| AU519621B2 (en) | 1981-12-17 |
| DE2703309B1 (en) | 1978-07-20 |
| JPS567400B2 (en) | 1981-02-17 |
| AU3276678A (en) | 1979-08-02 |
| SE426003B (en) | 1982-11-29 |
| FR2379191B1 (en) | 1984-07-13 |
| FR2379191A1 (en) | 1978-08-25 |
| CH622137A5 (en) | 1981-03-13 |
| NO141874C (en) | 1980-05-21 |
| DE2703309C2 (en) | 1979-03-22 |
| SE7800956L (en) | 1978-07-28 |
| DK580377A (en) | 1978-07-28 |
| NO141874B (en) | 1980-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |