CN104103350A - Electromagnetic wire, electromagnetic coil and variable-frequency motor provided with electromagnetic coil - Google Patents
Electromagnetic wire, electromagnetic coil and variable-frequency motor provided with electromagnetic coil Download PDFInfo
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- CN104103350A CN104103350A CN201410374605.7A CN201410374605A CN104103350A CN 104103350 A CN104103350 A CN 104103350A CN 201410374605 A CN201410374605 A CN 201410374605A CN 104103350 A CN104103350 A CN 104103350A
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Abstract
The invention discloses an electromagnetic wire, an electromagnetic coil and a variable-frequency motor provided with the electromagnetic coil. The electromagnetic wire comprises a lead, a first insulating layer formed by a dual-layer polyimide-fluorine 46 composite film, a second insulating layer formed by a single-side polyimide film reinforced insufficient glue mica tape, and a third insulating layer formed by dual-layer glass fibers. The first insulating layer, the second insulating layer and the third insulating layer are wound in sequence from inside to outside and are fixed on the lead. The electromagnetic wire according to the embodiment has superior corona resistance and insulating performance as well as high mechanical strength and heat resistance.
Description
Technical field
The present invention relates to the manufacture of high-pressure frequency-conversion motor and maintenance field, relate in particular to a kind of electromagnetic wire, solenoid and there is the adjustable frequency motor of this solenoid.
Background technology
Electromagnetic wire is one of critical material forming motor winding winding, and electromagnetic wire is mainly divided into two kinds, lapped wire and enamelled wire, and difference is the difference of insulating process.Enamelled wire refers at the outside of conductor coated insulation paint, makes to turn to the adjacent turn-to-turn insulation after coil, and enamelled wire has that insulating barrier is thin, smooth surface and be easy to the feature of winding displacement etc., is common in miniature motor.But for high-pressure frequency-conversion motor, because operating voltage is very high, the standard that requires to its insulation system also must corresponding improve, only very thin which floor insulating varnish obviously can not be guaranteed its insulating properties, therefore, the electromagnetic wire of common high-pressure frequency-conversion motor mostly is the lapped wire of multi-layer insulating structure.
Pulse-width modulation (PWM) variable frequency power supply is the most widely used a kind of power supply of frequency-conversion and speed-regulation motor, different from sinusoidal voltage, the electric current exemplary waveforms of its output voltage is equivalent to the on off state of repetition, and this state has a huge impact the insulation life of alternating current motor.In recent years, occurred the situation that the insulation system of large quantities of adjustable frequency motors is destroyed too early both at home and abroad, its chief reason is that the turn-to-turn short circuit being caused by turn-to-turn partial discharge causes.Adjustable frequency motor turn-to-turn insulation produces partial discharge, is called again corona phenomenon, and corona phenomenon occurs needs two conditions: the first, and the voltage between the adjacent turn of winding surpasses discharge inception voltage; The second, between adjacent turn, there is air gap or bubble.
In the production process of motor, although much motor manufacturing firm has adopted for example more advanced paint-dipping process of vacuum pressure impregnation, but still can not avoid intersection generation bubble and the air gap at the insulation system of electromagnetic wire completely.Because in AC field, electric field strength and dielectric constant are inversely proportional to, and the dielectric constant of gas is very little, so the electric field strength in bubble is than high a lot of in surrounding medium, and gas breakdown field intensity is generally much lower than liquid or solid, be therefore easy to occur electric discharge in bubble.The partial discharge effect of long term repeatability, must accelerate the aging of insulation system, finally damages motor, and pulse frequency is higher, and amplitude is larger, and the life-span of motor insulation system is just shorter.
When adopting the power supply of PWM variable frequency power supply, the insulation of adjustable frequency motor is under repeat effect of stress, if the electromagnetic wire that motor uses is not taked special design, technique and appraisal standards, the insulation of motor, by quick aging, causes the life-span of motor to become geometric progression to shorten.In addition, it is to be noted in the driving power of adjustable frequency motor and contain higher harmonic components, voltage in system, current changing rate large (being that dv/dt, dI/dt are high), this situation is except threatening the turn-to-turn insulation of motor, also will affect the heating of motor and bring out noise, vibration and too high shaft voltage, and too high shaft voltage can make the insulation against ground of bearing be on the hazard or damage.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic wire, solenoid and there is the adjustable frequency motor of this solenoid, with the insulation system that solves high-pressure frequency-conversion motor destroyed problem too early.
An aspect of of the present present invention provides a kind of electromagnetic wire, and described electromagnetic wire comprises: wire; The first insulating barrier, is formed by double-deck polyimide-fluorine 46 laminated films; The second insulating barrier, is formed by single-sided polyimide film reinforcement low resin mica tape; And the 3rd insulating barrier, by double glazing silk, formed, wherein, the first insulating barrier, the second insulating barrier and the 3rd insulating barrier are wrapped and be fixed on wire successively according to order from the inside to surface.
According to exemplary embodiment of the present invention, wire can be copper strap wire.
According to exemplary embodiment of the present invention, the two-sided thickness of the strand insulation structure of the first insulating barrier can be 0.30mm.
According to exemplary embodiment of the present invention, the thickness of described polyimide-fluorine 46 laminated films can be 0.0375mm.
According to exemplary embodiment of the present invention, the two-sided thickness of the strand insulation structure of the second insulating barrier can be 0.36mm.
According to exemplary embodiment of the present invention, the thickness of described single-sided polyimide film reinforcement low resin mica tape can be 0.09mm.
According to exemplary embodiment of the present invention, the two-sided thickness of the strand insulation structure of the 3rd insulating barrier can be 1.6mm.
According to exemplary embodiment of the present invention, the thickness of glass fiber can be 0.2mm.
Another aspect of the present invention provides a kind of solenoid, described solenoid utilization is made according to the electromagnetic wire of exemplary embodiment of the present invention, by polyimides epoxy dipping paints, described solenoid is carried out to turn-to-turn gel processing, and by mica paper tape, described solenoid is carried out to insulation against ground processing.
Another aspect of the present invention provides a kind of adjustable frequency motor, and described adjustable frequency motor has the solenoid according to exemplary embodiment of the present invention.
Accompanying drawing explanation
Description to exemplary embodiment of the present invention in conjunction with the drawings, above-mentioned and/or other features of the present invention and aspect will become clear and easy to understand, wherein:
Fig. 1 is according to the schematic diagram of the section of the electromagnetic wire of exemplary embodiment of the present invention.
Fig. 2 is according to the schematic diagram of the strand insulation structure of the electromagnetic wire of exemplary embodiment of the present invention.
Embodiment
Below, the exemplary embodiment that invention will be described in detail with reference to the attached drawing.Yet exemplary embodiment set forth herein is only illustrative, should not be understood to for limiting the present invention.Hereinafter except as otherwise noted, otherwise identical Reference numeral is indicated identical element all the time.
Fig. 1 is according to the schematic diagram of the section of the electromagnetic wire of exemplary embodiment of the present invention.As shown in Figure 1, electromagnetic wire can comprise wire 10, the first insulating barrier 20, the second insulating barrier 30 and the 3rd insulating barrier 40.In this exemplary embodiment, wire 10 can be copper strap wire, yet, the invention is not restricted to this, wire can also be any metal wire with electric conductivity.
A in Fig. 1 and B are thickness and the width of electromagnetic wire, and its nominal size and the margin of tolerance can be A:2.85mm～2.89mm, B:6.41mm～6.45mm.The bare wire specification of wire 10 can be 5.67mm * 2.02mm.The dimensional discrepancy of wire 10, radius of corner and sectional area should meet the regulation of GB6108.3.In addition, in the situation that wire 10 is copper strap wire, wire 10 also should meet the requirement of TBR type copper strap wire in GB5584.2, and its surface should be bright and clean, and the burr that do not have, scratch, copper powder, oxide layer and greasy dirt etc., to avoid that the first insulating barrier 20 is caused to damage.
In this exemplary embodiment, the first insulating barrier 20 can be formed by polyimide-fluorine 46 laminated films of double-layer structure.Specifically, first wrapped ground floor polyimide-fluorine 46 laminated films 21 on the surface of wire 10, secondly wrapped second layer polyimide-fluorine 46 laminated films 22 on ground floor polyimide-fluorine 46 laminated films 21, are then fixed to one another double-deck polyimide-fluorine 46 laminated films and wire 10 by sintering process.Should be noted that control sintering quality, guarantee the first insulating barrier 20 reliable in quality of formation, function admirable.Utilize film formed the first insulating barrier 20 of double-deck polyimide-fluorine 46 THIN COMPOSITE to have electrical property good, insulating barrier is even, not eccentric, free of pinholes, and the advantages such as thin thickness, to reducing insulation thickness, improve motor fan-out capability important in inhibiting.
Fig. 2 is according to the schematic diagram of the strand insulation structure of the electromagnetic wire of exemplary embodiment of the present invention.As shown in Figure 2, in this exemplary embodiment, the thickness in monolayer of polyimide-fluorine 46 laminated films is 0.0375mm, and the thickness of the first insulating barrier is a.Due to double-deck polyimide-fluorine 46 laminated films are wrapped to wire 10 and after completing sintering, the two-sided thickness 2a of the first insulating barrier 20 of the sub-thread electromagnetic wire obtaining can be 0.15mm, and therefore the two-sided thickness 4a of the strand insulation structure of the first insulating barrier 20 of adjacent two strands of electromagnetic wires can be 0.30mm.
In addition, according to exemplary embodiment of the present invention, the temperature index of double-deck polyimide-fluorine 46 laminated films of resistance to corona can be 220, under the condition of 23 ℃ of a-c cycle 50Hz, voltage 20KV/mm, temperature, its resistance to corona life-span can surpass 100000 hours (being equivalent to 11.5), more than its discharge inception voltage is compared with common imines film and can be improved twice.
Referring back to Fig. 1, in this exemplary embodiment, the second insulating barrier 30 can be formed by single-sided polyimide film reinforcement low resin mica tape.Specifically, single-sided polyimide film reinforcement low resin mica tape is wrapped on the first insulating barrier 20, and lapping direction can be identical with the first insulating barrier 20, also can be contrary.Then utilize bonding paint, by bonding process, single-sided polyimide film reinforcement low resin mica tape and polyimide-fluorine 46 laminated films are fitted tightly, without bubble or air gap.The bonding paint using and bonding process can not affect and destroy single-sided polyimide film reinforcement low resin mica tape and double-deck polyimide-fluorine 46 laminated films of resistance to corona performance index separately.The first insulating barrier 20 smooth surfaces of the wrapped sintering line of double-deck polyimide-fluorine 46 laminated film of resistance to corona obtaining, do not have the defects such as wrinkling or perk.
Mica has good insulating properties and thermal conductivity, mica is made to Mica tape and on electromagnetic wire, not only can strengthen turn-to-turn insulation, can also make heat that motor produces in when work by the thermal conductivity of mica tape Quick diffusing go out.Mica tape is conventionally by gel content classification, and the mica tape lower than about 9% is low resin mica tape, and glue content is middle glue mica tape between about 9%～22% mica tape, and it is resin-rich mica tape that glue content is greater than about 32% mica tape.The advantage of low resin mica tape is that insulating properties and thermal conductivity are good, but mica is hard and crisp material, and the unavoidable pliability of the poor mica tape of glue is not good enough.Exemplary embodiment utilizes polyimide film to carry out single-side reinforced to low resin mica tape, both insulating properties and the thermal conductivity of mica tape had been optimized, toughness and the intensity of mica tape have been improved again, making can be not cracked easily in its vibration that is enough to produce when high-pressure frequency-conversion motor is worked, and avoids the generation of turn-to-turn short circuit.
Referring again to Fig. 2, in this exemplary embodiment, the thickness in monolayer of single-sided polyimide film reinforcement mica tape is 0.09mm, and the thickness of the second insulating barrier is b.Due to by the single-sided polyimide film reinforcement Mica tape of individual layer to the first insulating barrier 20 and after completing bonding, the two-sided thickness 2b of the second insulating barrier 30 of the sub-thread electromagnetic wire obtaining can be 0.18mm, and therefore the two-sided thickness 4b of the strand insulation structure of the second insulating barrier 30 of adjacent two strands of electromagnetic wires can be 0.36mm.
Referring back to Fig. 1, in this exemplary embodiment, the 3rd insulating barrier 40 can be formed by double glazing silk.Glass fiber has two features, and thermal endurance is good and be easy to hang paint.This illustrative examples is wrapped ground floor glass fiber 41 on the second insulating barrier 30 first, next wrapped second layer glass fiber 42 on ground floor glass fiber 41, both lapping directions both can be the same or different, and then utilize glass fiber bonding paint, by bonding process, layer glass silk is fixed on the second insulating barrier 30.The performance index that the glass fiber bonding paint using and bonding process do not affect and destroy mica tape, the surface smoothing of the 3rd insulating barrier 40 of the mixed bag electromagnetic wire obtaining, continuous, does not have physical damage and the impurity such as crackle or fracture of wire.Because high-pressure frequency-conversion motor time can generate heat in work, so solenoid is often in the condition of high temperature, and the double glazing silk 41 of this exemplary embodiment and 42, because it has good thermal endurance, can bear high temperature and keep strand insulation and turn-to-turn insulation.
Referring again to Fig. 2, in this exemplary embodiment, the thickness in monolayer of glass fiber is 0.2mm, and the thickness of the 3rd insulating barrier is c.Due to double-deck glass fiber is wrapped to the second insulating barrier 30 and after completing bonding, the thickness 2c of the 3rd insulating barrier 40 of the sub-thread electromagnetic wire obtaining can be 0.8mm, and therefore the two-sided thickness 4c of the strand insulation structure of the 3rd insulating barrier 40 of adjacent two strands of electromagnetic wires can be 1.6mm.
In addition, the electromagnetic wire according to exemplary embodiment of the present invention can be made to solenoid, utilize mica paper tape wrapping coil to carry out insulation against ground processing, after bandaging, carry out rule assembling.After the rule assembling that completes coil, recycling polyimides epoxy dipping paints carries out turn-to-turn gel processing to winding, and the turn-to-turn of each coil of winding is closely fixed each other.According to the electromagnetic wire of exemplary embodiment of the present invention, can meet the requirement of variable frequency power supply, the material that the material of each insulating barrier and insulating varnish and making solenoid are used has compatibility.
In addition, can also be 10KV by be applied in operating voltage according to the solenoid of exemplary embodiment of the present invention, power is on the adjustable frequency motor of 2800KW, because this adjustable frequency motor is high-pressure frequency-conversion motor, according to the electromagnetic wire of exemplary embodiment of the present invention and solenoid, because of its excellent insulation system, can meet the requirement of high-pressure frequency-conversion motor to insulation.
Below, will describe according to electric property and the mechanical property of the electromagnetic wire of the high-pressure frequency-conversion motor of exemplary embodiment of the present invention.
(1) D.C. resistance
In the time of 20 ℃, the D.C. resistance of unit length meets:
R
20＝ρ
20/S
min
S
min: conductor minimum area, a, b is by the maximum value calculation of minimum dimension and r;
S
min＝a
min×b
min-0.8584r
2 max
ρ
20: the resistivity of conductor in the time of 20 ℃, the Ω mm of unit
2/ m.
(2) resistivity
In the time of 20 ℃, the resistivity of conductor meets ρ
20≤ 1/58 Ω mm
2/ m.
(3) puncture voltage
Test method is undertaken by GB/T4074.5-2008, rate of pressure rise 0.5KV/s, and the minimum break-down voltage of five samples of test is not less than 18KV.
(4) temperature index
The temperature index of double-deck polyimide-fluorine 46 laminated films of resistance to corona is 220.
The temperature index of all the other insulating varnish is 180.
(5) tack
After cutting stretching 15%, the length that all insulating barriers lose tack is all no more than 1b.
(6) percentage elongation
The percentage elongation of conductor is not less than 32%.
(7) springback angle
The maximum springback angle of electromagnetic wire is not more than 5 °.
In sum, according to the electromagnetic wire of exemplary embodiment of the present invention, adopt three kinds of different insulative materials to mix wrapped formation insulation system, improved the mechanical strength of electromagnetic wire, can meet the electrical strength requirement of high-pressure frequency-conversion motor, reduced cost.To according to the thread solenoid of the electromagnetism of exemplary embodiment of the present invention, be arranged in the high-pressure frequency-conversion motor of 10KV, 2800KW, corona resistance and insulating properties are excellent, and still operation conditions is good at China's Panxi Diqu, to stand the test of sweltering heat in summer.
Although as above illustrate and described exemplary embodiment of the present invention, it will be apparent to one skilled in the art that and the invention is not restricted to the disclosed embodiments, protection scope of the present invention should be as the criterion with claim and scope that equivalent was defined thereof.
Claims (10)
1. an electromagnetic wire, it comprises:
Wire;
The first insulating barrier, is formed by double-deck polyimide-fluorine 46 laminated films;
The second insulating barrier, is formed by single-sided polyimide film reinforcement low resin mica tape; And
The 3rd insulating barrier, is formed by double glazing silk,
Wherein, the first insulating barrier, the second insulating barrier and the 3rd insulating barrier are wrapped and be fixed on wire successively according to order from the inside to surface.
2. electromagnetic wire according to claim 1, wherein, wire is copper strap wire.
3. electromagnetic wire according to claim 1, wherein, the two-sided thickness of the strand insulation structure of the first insulating barrier is 0.30mm.
4. electromagnetic wire according to claim 3, wherein, the thickness of polyimide-fluorine 46 laminated films is 0.0375mm.
5. electromagnetic wire according to claim 1, wherein, the two-sided thickness of the strand insulation structure of the second insulating barrier is 0.36mm.
6. electromagnetic wire according to claim 5, wherein, the thickness of single-sided polyimide film reinforcement low resin mica tape is 0.09mm.
7. electromagnetic wire according to claim 1, wherein, the two-sided thickness of the strand insulation structure of the 3rd insulating barrier is 1.6mm.
8. electromagnetic wire according to claim 7, wherein, the thickness of glass fiber is 0.2mm.
9. a solenoid, it is characterized in that described solenoid utilizes electromagnetic wire according to claim 1 to make, by polyimides epoxy dipping paints, solenoid is carried out to turn-to-turn gel processing, and by mica paper tape, solenoid is carried out to insulation against ground processing.
10. an adjustable frequency motor, is characterized in that described adjustable frequency motor has solenoid according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410374605.7A CN104103350A (en) | 2014-07-31 | 2014-07-31 | Electromagnetic wire, electromagnetic coil and variable-frequency motor provided with electromagnetic coil |
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|---|---|---|---|
| CN201410374605.7A CN104103350A (en) | 2014-07-31 | 2014-07-31 | Electromagnetic wire, electromagnetic coil and variable-frequency motor provided with electromagnetic coil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070490A (en) * | 2015-08-07 | 2015-11-18 | 佛山市中研非晶科技股份有限公司 | Water-cooled anode reactor |
| CN108878010A (en) * | 2018-06-27 | 2018-11-23 | 浙江龙鹰光电科技有限公司 | Industrial stove igniter enamelling cuprum round line |
| CN108878045A (en) * | 2018-06-27 | 2018-11-23 | 浙江龙鹰光电科技有限公司 | 200 grades of enamelling cuprum round line of high operating time motor |
| CN110323905A (en) * | 2019-08-08 | 2019-10-11 | 建龙北满特殊钢有限责任公司 | A kind of Corona Discharge in High-voltage Electric Machine fault in-situ treatment process |
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| CN102034569A (en) * | 2009-09-30 | 2011-04-27 | 江苏迅达电磁线有限公司 | Mica tape covered film clad flat copper wire and processing technology thereof |
| CN103489509A (en) * | 2013-09-25 | 2014-01-01 | 苏州贯龙电磁线股份有限公司 | Electromagnetic wire used for motor coil winding |
| CN103840612A (en) * | 2013-12-19 | 2014-06-04 | 重庆赛力盟电机有限责任公司 | Single coil VPI process |
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| CN201556453U (en) * | 2009-09-30 | 2010-08-18 | 江苏迅达电磁线有限公司 | Mica tape-lapped thin film-deposited copper flat wire |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070490A (en) * | 2015-08-07 | 2015-11-18 | 佛山市中研非晶科技股份有限公司 | Water-cooled anode reactor |
| CN105070490B (en) * | 2015-08-07 | 2017-01-25 | 佛山市中研非晶科技股份有限公司 | Water-cooled anode reactor |
| CN108878010A (en) * | 2018-06-27 | 2018-11-23 | 浙江龙鹰光电科技有限公司 | Industrial stove igniter enamelling cuprum round line |
| CN108878045A (en) * | 2018-06-27 | 2018-11-23 | 浙江龙鹰光电科技有限公司 | 200 grades of enamelling cuprum round line of high operating time motor |
| CN110323905A (en) * | 2019-08-08 | 2019-10-11 | 建龙北满特殊钢有限责任公司 | A kind of Corona Discharge in High-voltage Electric Machine fault in-situ treatment process |
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Application publication date: 20141015 |