CA1124342A - Electrical winding - Google Patents
Electrical windingInfo
- Publication number
- CA1124342A CA1124342A CA320,551A CA320551A CA1124342A CA 1124342 A CA1124342 A CA 1124342A CA 320551 A CA320551 A CA 320551A CA 1124342 A CA1124342 A CA 1124342A
- Authority
- CA
- Canada
- Prior art keywords
- mica sheet
- insulation
- electrical
- side portions
- portions
- 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
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Insulating Of Coils (AREA)
- Manufacture Of Motors, Generators (AREA)
- Insulating Bodies (AREA)
Abstract
ABSTRACT
An electrical winding is disclosed which comprises coils of wire having substantially straight side portions and curved portions between the ends of the side portions, each of the side portions being provided with electrical insulation which includes a mica sheet coated with a supporting foil of plastics material. The mica sheet is wound in layers around the side portion such that, by virtue of the mica sheet having oblique sides successive layers encroach increasingly on the curved portions.
An electrical winding is disclosed which comprises coils of wire having substantially straight side portions and curved portions between the ends of the side portions, each of the side portions being provided with electrical insulation which includes a mica sheet coated with a supporting foil of plastics material. The mica sheet is wound in layers around the side portion such that, by virtue of the mica sheet having oblique sides successive layers encroach increasingly on the curved portions.
Description
,.~'\\ l~'Z43~2 This invention relates to an electrical winding.
A form of high-voltage-resistant main insulation is described in German Auslegeschrift 1,028,217.
According to one aspect of this invention there is provided an elec-trical winding comprising coils of wire having substantially, straight side portions and curved portions between the ends of the side portions, each of the side portions being provided with electrical insulation which includes a mica sheet coated with a supporting foil of plastics material and wound in layers around the side portion and such that, by virtue of the mica sheet hav-ing oblique sides, successive layers encroach increasingly on the curved por-tions.
The mica sheet could be provided with a synthetic resin binder.
The curved portions could be provided with electrical insulation which includes insulating tape wound in a spiral around the curved portions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having substantially uniform thickness. Such insulating tape could be provided with a synthetic resin binder capable of being hardened.
The coils of wire could comprise flat wire.
According to another aspect of this invention there is provided a method of applying electrical insulation to an electrical winding comprising coils of wire which have substantially straight side portions and curved por-tions between the ends of the side portions, the method comprising the step of providing each of the side portions with insulation, which includes a mica sheet coated with a supporting foil of plastics material, by winding the in-sulation in layers mainly around the side portions but such that, by virtue of the mica sheet having oblique sides, successive layers encroach increasing-ly on the curved portions.
Such a method could further comprise the step of securing the in-,, ~
;
-~l1;2 434;2 sulation around the side portions in an ironing-around machine at a temperature in the range from 60 centigrade to 80 centigrade.
The method could further comprise the step of impregnating each mica sheet, together with its supporting foil, with a synthetic resin binder, having a reduced hardening constituent to delay hardening.
The method could also further comprise the step of shaping each in-sulated coil in its non-hardened and non-compressed state into a shape suit-able for inserting into slots for the electrical winding in an electrical de-vice. The coils of wire could then be interconnected.
The method could further comprise the step of providing the curved portions with electrical insulation, which includes electrical insulating tape, by winding the insulation in a spiral around the curved portions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having substantially uniform thickness.
The electrical winding could finally be completely impregnated with resin.
The present invention will now be described by way of example with referenoe to the single figure of the accompanying drawing which shows an ex-ploded view of a winding coil and part of the insulation for the winding coil.
Referring to the figure, there is wound, on to each of straight side portions la and l_ of a fish-shaped winding coil, comprising flat wire, for a high voltage electrical machine rated at 5kV ~not shown) 1, a respective wide-tape, absorbent, fine mica sheet 2 ~of which only one - for the side la - is shown in the figure). This operation is carried out in an ironing-around machine at a temperature in the range from 60C to 80C under mechanical pre-stress. The mica sheet 2 is of trapezoidal shape and is coated with a support-ing foil of plastics material. Its longitudinal sides 2a and 2_ extend paral-lel to the straight side portions la and lb whilst its oblique sides 2c and 2d .. . .
~lZ4342 extend into the curved end portions B of the coil 1, the shorter longitudinal side 2bJ projecting on both sides beyond an area A of the longitudinal side la, not reaching the portions B, the areas A being in the slot of the electri-cal machine in use. Thus, the oblique sides of the main insulation provided by the mica sheet 2 extend from the longitudinal side 2a to the longitudinal side 2_ in an overlapping manner and with a decreasing number of layers pro-jecting into the portions B. In this connection, to help provide a smooth surface, each mica sheet 2 is wound on to its respective straight side portion of the coil commencing with the shorter longitudinal side 2_.
Each mica sheet 2, together with its supporting foil, is impregnated in excess with a synthetic resin binding agent having a considerably reduced hardening constituent. The latter helps to prevent hardening before it has been bent into a definitive shape. Also, the need for the application of in-sulation, comprising insulating tape, to the insulation is avoided.
Insulating tape comprising mica and absorbent material is applied to free parts of the portions B in a spiral, and with an increasing number of layers over the tapering end areas of the main insulation with the result that an overall insulation of virtually the same thickness is obtained which may be without cavities and creased pockets such that any concentrated weak points are avoided. Also, the length of such insulating tape required is reduced because of the location of transition points between the main insulation and the insulating tape in the region of the coil ends.
Finally, a bundle of laminations of the electrical machine together with the winding thus insulated is completely impregnated with resin and hardened.
' The resulting insulation may be high-voltage resistant, watertight, ; and not affected by radiation and changes in temperature. Also, it may be glow-discharge and vibration proof. Compression of the main insulation does .
not occur.
, : .
A form of high-voltage-resistant main insulation is described in German Auslegeschrift 1,028,217.
According to one aspect of this invention there is provided an elec-trical winding comprising coils of wire having substantially, straight side portions and curved portions between the ends of the side portions, each of the side portions being provided with electrical insulation which includes a mica sheet coated with a supporting foil of plastics material and wound in layers around the side portion and such that, by virtue of the mica sheet hav-ing oblique sides, successive layers encroach increasingly on the curved por-tions.
The mica sheet could be provided with a synthetic resin binder.
The curved portions could be provided with electrical insulation which includes insulating tape wound in a spiral around the curved portions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having substantially uniform thickness. Such insulating tape could be provided with a synthetic resin binder capable of being hardened.
The coils of wire could comprise flat wire.
According to another aspect of this invention there is provided a method of applying electrical insulation to an electrical winding comprising coils of wire which have substantially straight side portions and curved por-tions between the ends of the side portions, the method comprising the step of providing each of the side portions with insulation, which includes a mica sheet coated with a supporting foil of plastics material, by winding the in-sulation in layers mainly around the side portions but such that, by virtue of the mica sheet having oblique sides, successive layers encroach increasing-ly on the curved portions.
Such a method could further comprise the step of securing the in-,, ~
;
-~l1;2 434;2 sulation around the side portions in an ironing-around machine at a temperature in the range from 60 centigrade to 80 centigrade.
The method could further comprise the step of impregnating each mica sheet, together with its supporting foil, with a synthetic resin binder, having a reduced hardening constituent to delay hardening.
The method could also further comprise the step of shaping each in-sulated coil in its non-hardened and non-compressed state into a shape suit-able for inserting into slots for the electrical winding in an electrical de-vice. The coils of wire could then be interconnected.
The method could further comprise the step of providing the curved portions with electrical insulation, which includes electrical insulating tape, by winding the insulation in a spiral around the curved portions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having substantially uniform thickness.
The electrical winding could finally be completely impregnated with resin.
The present invention will now be described by way of example with referenoe to the single figure of the accompanying drawing which shows an ex-ploded view of a winding coil and part of the insulation for the winding coil.
Referring to the figure, there is wound, on to each of straight side portions la and l_ of a fish-shaped winding coil, comprising flat wire, for a high voltage electrical machine rated at 5kV ~not shown) 1, a respective wide-tape, absorbent, fine mica sheet 2 ~of which only one - for the side la - is shown in the figure). This operation is carried out in an ironing-around machine at a temperature in the range from 60C to 80C under mechanical pre-stress. The mica sheet 2 is of trapezoidal shape and is coated with a support-ing foil of plastics material. Its longitudinal sides 2a and 2_ extend paral-lel to the straight side portions la and lb whilst its oblique sides 2c and 2d .. . .
~lZ4342 extend into the curved end portions B of the coil 1, the shorter longitudinal side 2bJ projecting on both sides beyond an area A of the longitudinal side la, not reaching the portions B, the areas A being in the slot of the electri-cal machine in use. Thus, the oblique sides of the main insulation provided by the mica sheet 2 extend from the longitudinal side 2a to the longitudinal side 2_ in an overlapping manner and with a decreasing number of layers pro-jecting into the portions B. In this connection, to help provide a smooth surface, each mica sheet 2 is wound on to its respective straight side portion of the coil commencing with the shorter longitudinal side 2_.
Each mica sheet 2, together with its supporting foil, is impregnated in excess with a synthetic resin binding agent having a considerably reduced hardening constituent. The latter helps to prevent hardening before it has been bent into a definitive shape. Also, the need for the application of in-sulation, comprising insulating tape, to the insulation is avoided.
Insulating tape comprising mica and absorbent material is applied to free parts of the portions B in a spiral, and with an increasing number of layers over the tapering end areas of the main insulation with the result that an overall insulation of virtually the same thickness is obtained which may be without cavities and creased pockets such that any concentrated weak points are avoided. Also, the length of such insulating tape required is reduced because of the location of transition points between the main insulation and the insulating tape in the region of the coil ends.
Finally, a bundle of laminations of the electrical machine together with the winding thus insulated is completely impregnated with resin and hardened.
' The resulting insulation may be high-voltage resistant, watertight, ; and not affected by radiation and changes in temperature. Also, it may be glow-discharge and vibration proof. Compression of the main insulation does .
not occur.
, : .
Claims (12)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrical winding comprising coils of wire having substantially straight side portions and curved portions between the ends of the side por-tions, each of the side portions being provided with electrical insulation which includes a mica sheet coated with a supporting foil of plastics material and wound in layers around the side portion and such that, by virtue of the mica sheet having oblique sides, successive layers encroach increasingly on the curved portions.
2. An electrical winding according to claim 1, wherein the mica sheet is provided with a synthetic resin binder.
3. An electrical winding according to claim 2, wherein the curved por-tions are provided with electrical insulation which includes insulating tape wound in a spiral around the curved portions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having sub-stantially uniform thickness.
4. An electrical winding according to claim 3, wherein the insulating tape is provided with a synthetic resin binder capable of being hardened.
An electrical winding according to claim 1, 2 or 3 wherein the coils of wire comprise flat wire.
6. A method of applying electrical insulation to an electrical winding comprising coils of wire which have substantially straight side portions and curved portions between the ends of the side portions, the method comprising the step of providing each of the side portions with insulation, which in-cludes a mica sheet coated with a supporting foil of plastics material, by winding the insulation in layers mainly around the side portions but such that, by virtue of the mica sheet having oblique sides, successive layers en-croach increasingly on the curved portions.
7. A method according to claim 6, further comprising the step of securing the insulation around the side portions in an ironing-around machine at a temperature in the range from 60°C to 80°C.
8. A method according to claim 7, further comprising the step of im-pregnating each mica sheet, together with its supporting foil, with a syn-thetic resin binder, having a reduced hardening constituent to delay hardening.
9. A method according to claim 8, further comprising the step of shap-ing each insulated coil in its non-hardened and non-compressed state into a shape suitable for insertion into slots for the electrical winding in an elec-trical device.
10. A method according to claim 9, further comprising the step of inter-connecting the coils of wire.
11. A method according to claim 6, 7 or 10, further comprising the step of providing the curved portions with electrical insulation, which includes insulating tape, by winding the insulation in a spiral around the curved por-tions such that it overlaps encroaching layers of the mica sheet to produce overall electrical insulation having substantially uniform thickness.
12. A method according to claim 6, 7 or 10, further comprising the step of completely impregnating the electrical winding with resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2803974.9 | 1978-01-30 | ||
| DE19782803974 DE2803974A1 (en) | 1978-01-30 | 1978-01-30 | HIGH VOLTAGE-RESISTANT MAIN INSULATION FOR THE WINDING OF A HIGH VOLTAGE MACHINE AND METHOD FOR APPLYING IT TO THE WINDING COILS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1124342A true CA1124342A (en) | 1982-05-25 |
Family
ID=6030746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA320,551A Expired CA1124342A (en) | 1978-01-30 | 1979-01-30 | Electrical winding |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS54110423A (en) |
| AU (1) | AU512970B2 (en) |
| CA (1) | CA1124342A (en) |
| DE (1) | DE2803974A1 (en) |
| GB (1) | GB2013416B (en) |
| IN (1) | IN150378B (en) |
| ZA (1) | ZA79367B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123748A (en) * | 1980-03-03 | 1981-09-29 | Mitsubishi Electric Corp | Insulation structure of coil for rotary electric machine |
| US4635348A (en) * | 1983-10-14 | 1987-01-13 | Zyl Theodore D Van | Manufacture of electrical coils |
-
1978
- 1978-01-30 DE DE19782803974 patent/DE2803974A1/en not_active Ceased
-
1979
- 1979-01-17 IN IN48/CAL/79A patent/IN150378B/en unknown
- 1979-01-25 GB GB7902735A patent/GB2013416B/en not_active Expired
- 1979-01-26 AU AU43697/79A patent/AU512970B2/en not_active Ceased
- 1979-01-29 ZA ZA79367A patent/ZA79367B/en unknown
- 1979-01-30 JP JP961679A patent/JPS54110423A/en active Pending
- 1979-01-30 CA CA320,551A patent/CA1124342A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54110423A (en) | 1979-08-29 |
| IN150378B (en) | 1982-09-25 |
| ZA79367B (en) | 1980-01-30 |
| DE2803974A1 (en) | 1979-08-02 |
| AU512970B2 (en) | 1980-11-06 |
| GB2013416B (en) | 1982-09-02 |
| AU4369779A (en) | 1979-08-30 |
| GB2013416A (en) | 1979-08-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |