CA1174305A - Insulation of a coil for electric apparatus - Google Patents
Insulation of a coil for electric apparatusInfo
- Publication number
- CA1174305A CA1174305A CA000379337A CA379337A CA1174305A CA 1174305 A CA1174305 A CA 1174305A CA 000379337 A CA000379337 A CA 000379337A CA 379337 A CA379337 A CA 379337A CA 1174305 A CA1174305 A CA 1174305A
- Authority
- CA
- Canada
- Prior art keywords
- coil
- insulation
- electric apparatus
- mica
- impregnant
- 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
Landscapes
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
ABSTRACT
An improved insulation of a coil for electric apparatus is disclosed, in which an insulated wire is wound to form a coil which is then impregnated with an impregnant comprising a suspension of an organosilicon compound and a synthetic fluoro-mica in an organic solvent, followed by curing. A fluoro-compound vaporized from the synthetic fluoro-mica in the high temperature is combined with a siloxane decomposed from the organosilicon compound thereby to provide a ceramic formation.
An improved insulation of a coil for electric apparatus is disclosed, in which an insulated wire is wound to form a coil which is then impregnated with an impregnant comprising a suspension of an organosilicon compound and a synthetic fluoro-mica in an organic solvent, followed by curing. A fluoro-compound vaporized from the synthetic fluoro-mica in the high temperature is combined with a siloxane decomposed from the organosilicon compound thereby to provide a ceramic formation.
Description
~ ~7~305 FIELD OF 1~ IN~TION
This invention relates to an insulation of a coil for electric apparatus useful in an atmosphere of high temperatures above 300C.
BAS~GROUND OF ~E IN~TION
Heretofore, an insulation of a coil for rotary electric apparatus and the like has been formed by placing an insulating layer of tapes or sheets mainly consisting of synthetic resin or natural mica along an inner surface of a slot adapted to receive the coil, accommodating the conductive coil of an insulated and wound wire into the slot wi~h mounting of a wedge and then impregnating the resultants with an impregnant of a suspension of a natural laminated mica in a solvent of organo-silicon compound thereby to fill up gaps formed between the coil and the insulating layer as well as the inner gaps of the coil per se. In such insulation,however, ~he organo silicon compound is thermally degradated in an atmosphere of an elevated temperature above 300C with undesired loss of the bonding ability between the filled insulating medium and the insulating layer and thus with reduction of the mechanical and dielectric strengths.
~RY OF THE INVENTION
A general object of the invention is to eliminate the disadvantage of the conventional insulation described hereinbefore
This invention relates to an insulation of a coil for electric apparatus useful in an atmosphere of high temperatures above 300C.
BAS~GROUND OF ~E IN~TION
Heretofore, an insulation of a coil for rotary electric apparatus and the like has been formed by placing an insulating layer of tapes or sheets mainly consisting of synthetic resin or natural mica along an inner surface of a slot adapted to receive the coil, accommodating the conductive coil of an insulated and wound wire into the slot wi~h mounting of a wedge and then impregnating the resultants with an impregnant of a suspension of a natural laminated mica in a solvent of organo-silicon compound thereby to fill up gaps formed between the coil and the insulating layer as well as the inner gaps of the coil per se. In such insulation,however, ~he organo silicon compound is thermally degradated in an atmosphere of an elevated temperature above 300C with undesired loss of the bonding ability between the filled insulating medium and the insulating layer and thus with reduction of the mechanical and dielectric strengths.
~RY OF THE INVENTION
A general object of the invention is to eliminate the disadvantage of the conventional insulation described hereinbefore
- 2 -~ 17~305 and to achieve an improvement thereof by providing an insulation of a coil which may be used in an atm~sphere o~ an elevated telperature above 30DC with negli~ible reduction of the mechanical and dielectric strengths.
To achieve the foregoing object, an insulation of a coil for the electric apparatus accordm g to the invention is chsracterized in that an insulated wire is wound to form a coil which is then impregnated with an impregnant consisting of a suspension of an organosilicon compound and a synthetic fluoro-mlca in an or~anic solvent followed by curing and that a fluoro-compound vapori2ed from said synthetic fluoro-mica in an atmosphere above 300C is combined with a $iloxane deco~posed from said organosilicon compound thereby to provide a ceramic formation.
The coil of the insulated wire may be a coil for an electric n~tor or a coil for an electric transfoTmer.
The impregnated and cured ~aterial of the impregnant m~y be preheated to not lower than 300C to provide ~ ceramuc formation or made into a ceramic formation when used in an atmosphere of an elevated temperature of not lower than 300C. Further, the impre~nant is prepared by suspendlng small pieces of synthetic fluoro-mica having a length of not more than S~m with a diam~ter of 0.1 to 5 ~m in a solvent of organosilicon compound in a weight ratio of not less than 1 : 1 together with an organic solvent. The organic solvent may be of a mixed solvent of xylene, butylcellosolve and cellosolve acetate.
1 ~ 7 4 3 0 5 The insulation o~ the coil for the electric apparatus according to the invention is substantially comprised of an iron core, a slot formed in the iron core, an insulating sheet for ground of a double sided laminated mica sheet which is circumferentially placed in the siot, an interphase insulating sheet of a laminated mica plate, conductive coils placed in the insulating sheet with separation through an insulating sheet and a wedge member for supporting the elements. ~he conductive coils may preferably be coated with nickel.
Other objects and advantages of ~he invention will become obvious after considering the detailed description of the invention in connection with the preferred embodiments thereof shown in the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWIN~.
Figure 1 shows a sectional side view of an insulation of a coil for the electric apparatus according to the present invention.
PREFERRED EMEODIMENT OF THE INVENTION
In the drawing, an insulation of a coil for the electric apparatus according to the invention is comprised of an iron core lO, a slot 12 forned in the iron core 10, an insulating sheet for ground of a double-sided laminated mica sheet 14 which is circumferentially placed in the slot 12, an interphase insulating sheet of a laminated mica plate 16, conductive coils 18t 18 placed in the insulating sheet 14 with separation through the insulating mica sheet 16 and a wedge member 20.
The conductive coils are pre~errably made of copper wire, the surface of which is coated with nickel for protection from the thenmal oxidation.
An impregnant 22 may be prepared by suspending small pieces of synthetic fluoro-mica having a length of not more than 5~m with a diameter of 0~1 to 5 ~m in a sol~ent o~ organosilicon compound in a weight ratio of not less than 1 : 1 together with an organic solvent such as a mixed solvent of xylene, butylcellosolve an~ cellosolve acetate, followed by impregnation and curing. Thus impregnated and cured material is further heated to not l~wer than 3~0C or used in the atmosphere of an elevatet temperature not lower than 300C, thereby to vaporize some fluoro-compound such as SiF4, KP and the like, from the synthetic fluoro-mica, which is combined with siloxane derived from the organosilicon compound thereby to provide a ceramic formation.
Now referring to an embodiment of an insulation of the coil for 22 KW motor, the iron core into the slot 12 of which are inserted the insulating sheet for earth 14, the interphase insulatinE sheet 16, the conductive coil 18 and the wedge me~ber 20 is preheated at 120C
to rem~ve ~oisture of each material. Thereafter, the iron core is cooled to 40 - 50C and is then immersed in the organosilicon solvent con~aining the suspended synthetic fluoro-mica for approximstely 10 ~unutes for subsequent drying in air ~or abou~ one houT and thereafter heat-dried at about 80C for two hours. Further, drsing takes place at about 120C for 2 hours to remove the solvent and then heated at not lower than 200C for 2 hours with curing.
The following table shows the comparison of the invented coil with an insulated coil impregnated with TEF~DN (trade mark) material, showing the fact that the heat-resistant coil with the TEF~DN material to 400C for about 1300 hours after exposed reduces greatly the dielectric strength of insulation with loss of the function of the apparatus, where~s no reduction of the dielectric strength may be seen in the insulated coil according to the invention as compar~d with the ori~inals, even after exposure to 400C for 1400 hours.
( Unit : KV ) , _ . _ _ . _ ,.
Insulated Coil In~ented Coil with TEF~CN Material . . _ Initial Afte uselnitial After use for 1400 hrs. for 1300 hrs.
Dielectric Strength3.95 3.92 3.45 1.04 between phases _ Dielectric Strength3.80 4.3~ 4.80 0.90 for earth _ _ 1 ~7~30~
As described hereinbefore, in accordance with the invention the coil is impregnated with the impregnant having suspe~ded therein the synthetic fluoro-mica in the solvent of the organo-silicon compound which is then cured. In the atmosphere of high temperature, the fluoro-compound vaporized from the synthetic fluoro-muca is combined with siloxane decomposed from the organosilicon compound thereby to provide the ceramic formation, thus ~esulting in the excellent properties in the mechanical and dielectric strength of the insulation as well as the absence of thermal degradation in the high temperature.
Especially in the insulation of the coil for rotary electric apparatus, the impregnation with~n the slot may be adequately ensured due to the small particle size of ~he synthetic fluoro-mica so that any failure OT damage of the insulated coil throu~h vib~ation or impact may be avoided While the insulation of the conductive coil for the rotary elec~ric apparatus has been described hereinbefore with reference to the appended drawing, it will still be appreciated that the invention should not be limited thereto but is applicable to the insulation of the conductive coil for a transformer and the like, and that the impregnation may be performed by spraying,direct application, nDlding other means in lieu of the imrersion employed in the embodiment.
To achieve the foregoing object, an insulation of a coil for the electric apparatus accordm g to the invention is chsracterized in that an insulated wire is wound to form a coil which is then impregnated with an impregnant consisting of a suspension of an organosilicon compound and a synthetic fluoro-mlca in an or~anic solvent followed by curing and that a fluoro-compound vapori2ed from said synthetic fluoro-mica in an atmosphere above 300C is combined with a $iloxane deco~posed from said organosilicon compound thereby to provide a ceramic formation.
The coil of the insulated wire may be a coil for an electric n~tor or a coil for an electric transfoTmer.
The impregnated and cured ~aterial of the impregnant m~y be preheated to not lower than 300C to provide ~ ceramuc formation or made into a ceramic formation when used in an atmosphere of an elevated temperature of not lower than 300C. Further, the impre~nant is prepared by suspendlng small pieces of synthetic fluoro-mica having a length of not more than S~m with a diam~ter of 0.1 to 5 ~m in a solvent of organosilicon compound in a weight ratio of not less than 1 : 1 together with an organic solvent. The organic solvent may be of a mixed solvent of xylene, butylcellosolve and cellosolve acetate.
1 ~ 7 4 3 0 5 The insulation o~ the coil for the electric apparatus according to the invention is substantially comprised of an iron core, a slot formed in the iron core, an insulating sheet for ground of a double sided laminated mica sheet which is circumferentially placed in the siot, an interphase insulating sheet of a laminated mica plate, conductive coils placed in the insulating sheet with separation through an insulating sheet and a wedge member for supporting the elements. ~he conductive coils may preferably be coated with nickel.
Other objects and advantages of ~he invention will become obvious after considering the detailed description of the invention in connection with the preferred embodiments thereof shown in the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWIN~.
Figure 1 shows a sectional side view of an insulation of a coil for the electric apparatus according to the present invention.
PREFERRED EMEODIMENT OF THE INVENTION
In the drawing, an insulation of a coil for the electric apparatus according to the invention is comprised of an iron core lO, a slot 12 forned in the iron core 10, an insulating sheet for ground of a double-sided laminated mica sheet 14 which is circumferentially placed in the slot 12, an interphase insulating sheet of a laminated mica plate 16, conductive coils 18t 18 placed in the insulating sheet 14 with separation through the insulating mica sheet 16 and a wedge member 20.
The conductive coils are pre~errably made of copper wire, the surface of which is coated with nickel for protection from the thenmal oxidation.
An impregnant 22 may be prepared by suspending small pieces of synthetic fluoro-mica having a length of not more than 5~m with a diameter of 0~1 to 5 ~m in a sol~ent o~ organosilicon compound in a weight ratio of not less than 1 : 1 together with an organic solvent such as a mixed solvent of xylene, butylcellosolve an~ cellosolve acetate, followed by impregnation and curing. Thus impregnated and cured material is further heated to not l~wer than 3~0C or used in the atmosphere of an elevatet temperature not lower than 300C, thereby to vaporize some fluoro-compound such as SiF4, KP and the like, from the synthetic fluoro-mica, which is combined with siloxane derived from the organosilicon compound thereby to provide a ceramic formation.
Now referring to an embodiment of an insulation of the coil for 22 KW motor, the iron core into the slot 12 of which are inserted the insulating sheet for earth 14, the interphase insulatinE sheet 16, the conductive coil 18 and the wedge me~ber 20 is preheated at 120C
to rem~ve ~oisture of each material. Thereafter, the iron core is cooled to 40 - 50C and is then immersed in the organosilicon solvent con~aining the suspended synthetic fluoro-mica for approximstely 10 ~unutes for subsequent drying in air ~or abou~ one houT and thereafter heat-dried at about 80C for two hours. Further, drsing takes place at about 120C for 2 hours to remove the solvent and then heated at not lower than 200C for 2 hours with curing.
The following table shows the comparison of the invented coil with an insulated coil impregnated with TEF~DN (trade mark) material, showing the fact that the heat-resistant coil with the TEF~DN material to 400C for about 1300 hours after exposed reduces greatly the dielectric strength of insulation with loss of the function of the apparatus, where~s no reduction of the dielectric strength may be seen in the insulated coil according to the invention as compar~d with the ori~inals, even after exposure to 400C for 1400 hours.
( Unit : KV ) , _ . _ _ . _ ,.
Insulated Coil In~ented Coil with TEF~CN Material . . _ Initial Afte uselnitial After use for 1400 hrs. for 1300 hrs.
Dielectric Strength3.95 3.92 3.45 1.04 between phases _ Dielectric Strength3.80 4.3~ 4.80 0.90 for earth _ _ 1 ~7~30~
As described hereinbefore, in accordance with the invention the coil is impregnated with the impregnant having suspe~ded therein the synthetic fluoro-mica in the solvent of the organo-silicon compound which is then cured. In the atmosphere of high temperature, the fluoro-compound vaporized from the synthetic fluoro-muca is combined with siloxane decomposed from the organosilicon compound thereby to provide the ceramic formation, thus ~esulting in the excellent properties in the mechanical and dielectric strength of the insulation as well as the absence of thermal degradation in the high temperature.
Especially in the insulation of the coil for rotary electric apparatus, the impregnation with~n the slot may be adequately ensured due to the small particle size of ~he synthetic fluoro-mica so that any failure OT damage of the insulated coil throu~h vib~ation or impact may be avoided While the insulation of the conductive coil for the rotary elec~ric apparatus has been described hereinbefore with reference to the appended drawing, it will still be appreciated that the invention should not be limited thereto but is applicable to the insulation of the conductive coil for a transformer and the like, and that the impregnation may be performed by spraying,direct application, nDlding other means in lieu of the imrersion employed in the embodiment.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An insulation of a coil for an electric apparatus, characterized in that an insulated wire is wound to form a coil which is then impregnated with an impregnant comprising a suspension of an organosilicon compound and a synthetic fluoro-mica in an organic solvent followed by curing of the impregnant and that a fluoro-compound vaporized from said synthetic fluoro-mica in an atmosphere above 300°C is combined with a siloxane decomposed from said organosilicon compound, thereby to provide a ceramic formation.
2. An insulation of a coil for an electric apparatus as claimed in claim 1, wherein the coil of the insulated wire is a coil for an electric motor.
3. An insulation of a coil for an electric apparatus as claimed in claim 1, wherein the coil of the insulated wire is a coil for an electric transformer.
4. An insulation of a coil for an electric apparatus as claimed in claims 1 to 3, wherein following said curing of the impregnant the latter is heated to not lower than 300°C
to provide a ceramic formation.
to provide a ceramic formation.
5. An insulation of a coil for an electric apparatus as claimed in claims 1 to 3, wherein following said curing of the impregnant the latter is made into a ceramic formation when used in an atmosphere of an elevated temperature of not lower than 300°C.
6. An insulation of a coil for an electric apparatus as claimed in claim 1, wherein the impregnant is prepared by suspending small pieces of synthetic fluoro-mica having a length of not more than 5µm with a diameter of 0.1 to 5µm in a solvent of organosilicon compound in a weight ratio of not less than 1:1 together with an organic solvent.
7. An insulation of a coil for an electric apparatus as claimed in claim 6, wherein the organic solvent is a mixed solvent of xylene, butylcellosolve and cellosolve acetate.
8. An insulation of a coil according to claim 1 for an electric apparatus comprising an iron core, a slot formed in said iron core, an insulating sheet for insulating against ground and comprising a laminated mica sheet surrounding conductive coilswithin the slot, an insulating sheet in form of a laminated mica plate within the mica sheet and separating said conductive coils from another within said mica sheet, and a wedge member within said slot adjacent a gap and disposed outside and spaced from said laminated mica sheet.
9. An insulation of a coil for an electric apparatus as claimed in claim 1, wherein the conductive coil is coated with nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000379337A CA1174305A (en) | 1981-06-09 | 1981-06-09 | Insulation of a coil for electric apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000379337A CA1174305A (en) | 1981-06-09 | 1981-06-09 | Insulation of a coil for electric apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1174305A true CA1174305A (en) | 1984-09-11 |
Family
ID=4120186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000379337A Expired CA1174305A (en) | 1981-06-09 | 1981-06-09 | Insulation of a coil for electric apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1174305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682795A (en) * | 2020-06-12 | 2020-09-18 | 南京航达超控科技有限公司 | Rotary traveling wave ultrasonic motor with backup function and drive control method thereof |
-
1981
- 1981-06-09 CA CA000379337A patent/CA1174305A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682795A (en) * | 2020-06-12 | 2020-09-18 | 南京航达超控科技有限公司 | Rotary traveling wave ultrasonic motor with backup function and drive control method thereof |
| CN111682795B (en) * | 2020-06-12 | 2022-09-27 | 南京航达超控科技有限公司 | Rotary traveling wave ultrasonic motor with backup function and drive control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |