CN114121402A - Magnetic suspension electromagnet unit and packaging method thereof - Google Patents

Magnetic suspension electromagnet unit and packaging method thereof Download PDF

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Publication number
CN114121402A
CN114121402A CN202111640490.8A CN202111640490A CN114121402A CN 114121402 A CN114121402 A CN 114121402A CN 202111640490 A CN202111640490 A CN 202111640490A CN 114121402 A CN114121402 A CN 114121402A
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Prior art keywords
magnetic suspension
magnetic
suspension electromagnet
electromagnet unit
winding
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CN202111640490.8A
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Chinese (zh)
Inventor
蒋露
贺全忠
韩洪兵
邵博
景致钧
成红蕾
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Hunan Medex Electric Co ltd
Hunan Lince Rolling Stock Equipment Co Ltd
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Hunan Medex Electric Co ltd
Hunan Lince Rolling Stock Equipment Co Ltd
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Priority to CN202111640490.8A priority Critical patent/CN114121402A/en
Publication of CN114121402A publication Critical patent/CN114121402A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L13/00—Electric propulsion for monorail vehicles, suspension vehicles or rack railways; Magnetic suspension or levitation for vehicles
    • B60L13/04—Magnetic suspension or levitation for vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/022—Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005—Impregnating or encapsulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The invention provides a magnetic suspension electromagnet unit, which comprises a magnetic suspension electromagnet winding, an iron core block and a quenching and tempering iron core; impregnating varnish is impregnated in the magnetic suspension electromagnet winding, and the magnetic suspension electromagnet winding is sequentially wrapped with a pouring layer and a protective layer from inside to outside; an insulating layer or a pouring layer is arranged on the outer surface of the iron core block and is embedded into the hardened and tempered iron core to form a magnetic-conductive rigid framework; the magnetic suspension electromagnet winding is nested on the magnetic conduction rigid framework to form a magnetic suspension electromagnet unit. The magnetic suspension electromagnet unit provided by the invention has the advantage that the magnetic conductance capability of the magnetic conductive material is better improved on the premise of not increasing the weight of components. The invention provides a method for packaging a magnetic suspension electromagnet. The packaging method of the magnetic suspension electromagnet provided by the invention can simultaneously ensure the insulation and the water resistance of the winding, improve the heat dissipation capacity and effectively reduce the phenomena of cracking, peeling, bulging and the like of the pouring layer.

Description

Magnetic suspension electromagnet unit and packaging method thereof
Technical Field
The invention relates to the technical field of magnetic suspension trains, in particular to a magnetic suspension electromagnet unit and a packaging method thereof.
Background
The maglev train is called a ground-attached flying vehicle, and the maglev electromagnet at the bottom of the train frame is exposed to the outdoor environment for long time for working. In order to ensure the safe operation of the magnetic suspension train, the insulation performance and the protection level of the package of the suspension electromagnet must be ensured, and a large amount of generated heat energy needs to be dissipated. One of the factors determining the carrying capacity of the maglev train is the electromagnetic attraction force generated by the electromagnet, the magnetic conductive material of the existing maglev electromagnet is mainly Q235B, the material belongs to weak magnetic conductive material, and the Q235B magnetic saturation point is low, so that the overload capacity of the electromagnet is poor.
At present, the suspension electromagnet is mostly packaged by epoxy resin or modified materials thereof, and good insulating property can be achieved. However, the thermal conductivity coefficient of the epoxy resin or the modified material thereof is not high, and the heat of the magnetic suspension electromagnet winding cannot be quickly dissipated, so that the temperature difference between the inside and the outside of the winding is large. When the magnetic suspension train runs in hot weather or overload, the heat of the electromagnet winding can not be dissipated in time due to the increase of loss, the temperature inside the winding rises and exceeds the tolerance temperature of the insulating material, so that the electromagnet is over-temperature alarmed or damaged, and the safe running of the magnetic suspension train is influenced. Epoxy or its modified material is great because of its thermal expansion coefficient and copper, aluminium material's deviation to it has certain rigidity, and after the winding temperature rose, the phenomenon that the electro-magnet pouring layer took place fracture, swell, ponding occasionally, if the electro-magnet unit changes untimely, there is the potential safety hazard in the train operation.
In summary, how to ensure the insulation damage and poor heat dissipation capability of the magnetic suspension electromagnet under the operating environments of high power consumption, high humidity, high heat, long-term ultraviolet irradiation and the like has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a magnetic suspension electromagnet unit and a packaging method thereof, aiming at the defects in the prior art.
In order to achieve the aim, the invention provides a magnetic suspension electromagnet unit, which comprises a magnetic suspension electromagnet winding, an iron core block and a quenching and tempering iron core; impregnating varnish is impregnated in the magnetic suspension electromagnet winding, and the magnetic suspension electromagnet winding is sequentially wrapped with a pouring layer and a protective layer from inside to outside; an insulating layer or a pouring layer is arranged on the outer surface of the iron core block and is embedded into the hardened and tempered iron core to form a magnetic-conductive rigid framework; the magnetic suspension electromagnet winding is nested on the magnetic conduction rigid framework to form a magnetic suspension electromagnet unit.
Optionally, the magnetic suspension electromagnet winding is formed by winding a single glass fiber corona-resistant polyimide film around an aluminum flat wire or a copper flat wire in a sintering manner.
Optionally, the core block is a radial core block structure formed by stacking high magnetic induction grain-oriented silicon steel.
Optionally, the impregnating varnish is set to be a 200-grade solvent-free impregnating varnish.
Optionally, the pouring layer is set as an organic silicon adhesive force heat conduction pouring sealant.
Optionally, the protective layer is an ultraviolet-resistant and anti-aging protective layer.
Optionally, a heat dissipation channel is further arranged between the magnetic conductive rigid framework and the magnetic suspension electromagnet winding.
The invention also provides a method for packaging the magnetic suspension electromagnet unit, which comprises the following steps:
step one, manufacturing a magnetic suspension electromagnet unit: the iron core block is dipped in insulating varnish or is embedded in the quenched and tempered iron core after being cast and shaped, so that a magnetic-conducting rigid framework is formed; winding a magnetic suspension electromagnet winding by winding an aluminum flat wire or a copper flat wire through sintering a single glass fiber corona-resistant polyimide film; nesting a magnetic suspension electromagnet winding on a magnetic conduction rigid framework to form a magnetic suspension electromagnet unit;
step two, dipping: dipping 200-grade impregnating varnish by adopting a VPI process and curing;
step three, pouring: placing the whole immersed and cured magnetic suspension electromagnet unit into a casting mold, casting organic silicon high-adhesion heat-conducting pouring sealant on the outer surface of the magnetic suspension electromagnet unit by using a vacuum casting machine, and correcting the surface of a casting layer after casting and demolding;
step four, spraying a protective layer: and spraying an ultraviolet-resistant anti-aging protective layer on the surface of the casting layer of the magnetic suspension electromagnet unit after the casting is finished, and finishing the packaging of the magnetic suspension electromagnet unit.
Optionally, before dipping, the magnetic suspension electromagnet unit is degassed for 30 minutes in vacuum of 100pa-150 pa.
Optionally, the method for curing the magnetic suspension electromagnet unit after dipping specifically comprises the following steps: the method adopts a rotary baking process, and the mixture is cured in an oven at 165 +/-5 ℃ at the differential rotation speed of 5-8 revolutions per minute.
Compared with the prior art, the invention has the following beneficial effects:
(1) the magnetic suspension electromagnet unit provided by the invention is calculated according to the electromagnet magnetic density
Figure BDA0003443712320000021
And ampere turn number calculation formula
Figure BDA0003443712320000022
The magnetic conductance capability of the magnetic conducting material is better improved on the premise of not increasing the weight of the component; and when the current is increased to improve the attraction of the electromagnet, the current increase amplitude is also reduced, so that the loss of the magnetic suspension electromagnet unit is also reduced in the use process.
(2) The packaging method of the magnetic suspension electromagnet provided by the invention can simultaneously ensure the insulation and the water resistance of the winding, improve the heat dissipation capacity and effectively reduce the phenomena of cracking, peeling, bulging and the like of the pouring layer.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a magnetic levitation electromagnet unit according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for packaging a magnetic levitation electromagnet according to an embodiment of the present invention.
Wherein:
1. the magnetic suspension electromagnet comprises a magnetic suspension electromagnet winding 2, a magnetic conduction rigid framework 3, an iron core block 4, a quenching and tempering iron core 5, impregnating varnish 6, a pouring layer 7, a protective layer 8 and a heat dissipation channel.
Detailed Description
Referring to fig. 1, the magnetic levitation electromagnet unit provided by the invention comprises a magnetic levitation electromagnet winding 1, an iron core block 3 and a quenching and tempering iron core 4; impregnating varnish 5 is impregnated in the magnetic suspension electromagnet winding 1, and the magnetic suspension electromagnet winding 1 is sequentially wrapped with a pouring layer 6 and a protective layer 7 from inside to outside; an insulating layer or a pouring layer is arranged on the outer surface of the iron core block 3 and is embedded into the quenched and tempered iron core 4 to form a magnetic-conducting rigid framework 2; the magnetic suspension electromagnet winding 1 is nested on the magnetic conduction rigid framework 2 to form a magnetic suspension electromagnet unit. Preference is given here to: the quenched and tempered iron core 4 is made of No. 45 steel subjected to quenching and tempering; the insulating layer that the surface of iron core piece 3 was equipped with adopts the mode of flooding insulated paint to set up.
Optionally, the magnetic suspension electromagnet winding 1 is formed by winding a single glass fiber corona-resistant polyimide film by sintering and wrapping an aluminum flat wire or a copper flat wire.
Optionally, the core block 3 is configured as a radial core block structure formed by stacking high-magnetic-induction oriented silicon steel.
Optionally, the impregnating varnish 5 is set as a 200-grade solvent-free impregnating varnish.
Optionally, the pouring layer 6 is set as an organic silicon adhesive force heat conduction pouring sealant.
Optionally, the protective layer 7 is a uv-resistant and anti-aging protective layer.
Optionally, a heat dissipation channel 8 is further disposed between the magnetic conductive rigid framework 2 and the magnetic suspension electromagnet winding 1. Preference is given here to: the heat dissipation channel 8 is provided with two groups of heat dissipation channel components which are arranged on two parallel end surfaces of the quenched and tempered iron core 4 in parallel, and a single group of heat dissipation channel components adopts a plurality of single heat dissipation channels 8 which are arranged at intervals.
The invention also provides a method for packaging the magnetic suspension electromagnet, and as shown in fig. 2, the steps of packaging the magnetic suspension electromagnet unit by using the packaging method are as follows:
step one, manufacturing a magnetic suspension electromagnet unit: the iron core block is dipped in insulating varnish or is embedded in the quenched and tempered iron core after being cast and shaped, so that a magnetic-conducting rigid framework is formed; winding a magnetic suspension electromagnet winding by winding an aluminum flat wire or a copper flat wire through sintering a single glass fiber corona-resistant polyimide film; nesting a magnetic suspension electromagnet winding on a magnetic conduction rigid framework to form a magnetic suspension electromagnet unit;
step two, dipping: dipping 200-grade impregnating varnish by adopting a VPI process and curing;
step three, pouring: placing the whole immersed and cured magnetic suspension electromagnet unit into a casting mold, casting organic silicon high-adhesion heat-conducting pouring sealant on the outer surface of the magnetic suspension electromagnet unit by using a vacuum casting machine, and correcting the surface of a casting layer after casting and demolding;
step four, painting a protective layer: and spraying an ultraviolet-resistant anti-aging protective layer on the surface of the casting layer of the magnetic suspension electromagnet unit after the casting is finished, and finishing the packaging of the magnetic suspension electromagnet unit.
Optionally, before dipping, the magnetic suspension electromagnet unit is degassed for 30 minutes in vacuum of 100pa-150 pa.
Optionally, the method for curing the magnetic suspension electromagnet unit after dipping specifically comprises the following steps: the method adopts a rotary baking process, and the mixture is cured in an oven at 165 +/-5 ℃ at the differential rotation speed of 5-8 revolutions per minute.
Optionally, multiple physical tests verify that the encapsulated magnetic suspension electromagnet unit can still maintain an insulation resistance of more than 1000 mohm after being immersed in hot water at 75 ℃ for 72 hours (see table 1), and after the tests such as temperature rise, high and low temperature impact, damp and hot circulation, ultraviolet irradiation and the like, the phenomena of cracking, peeling, bulging and the like do not occur on a casting layer, so that the quality is stable and reliable; the magnetic conduction rigid framework is formed by nesting 45# steel and high magnetic induction oriented silicon steel, the magnetic conduction capability of the electromagnet is improved on the premise of not increasing the weight of components, and when the attractive force of the electromagnet needs to be improved in a current increasing mode, the current increasing amplitude is reduced, which means that the loss is increased and reduced; and a heat dissipation channel is arranged between the winding and the magnetic conduction rigid framework, so that the heat dissipation of the winding bottom layer and the magnetic conduction rigid framework is facilitated.
TABLE 1
Figure BDA0003443712320000041
Figure BDA0003443712320000051
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A magnetic suspension electromagnet unit is characterized by comprising a magnetic suspension electromagnet winding, an iron core block and a quenching and tempering iron core;
impregnating varnish is impregnated in the magnetic suspension electromagnet winding, and the magnetic suspension electromagnet winding is sequentially wrapped with a pouring layer and a protective layer from inside to outside;
an insulating layer or a pouring layer is arranged on the outer surface of the iron core block and is embedded into the hardened and tempered iron core to form a magnetic-conductive rigid framework;
the magnetic suspension electromagnet winding is nested on the magnetic conduction rigid framework to form a magnetic suspension electromagnet unit.
2. A magnetically suspended electromagnet unit as claimed in claim 1, in which the magnetically suspended electromagnet windings are wound from single glass fibre corona resistant polyimide film sintered around flat aluminium or copper wires.
3. A magnetically suspended electromagnet unit according to claim 1, wherein the core blocks are arranged as stacked radial core block structures of high magnetic induction oriented silicon steel.
4. A magnetically suspended electromagnet unit according to claim 1, wherein the impregnating varnish is provided as a class 200 solvent-free impregnating varnish.
5. A magnetically suspended electromagnet unit according to claim 1, wherein the potting layer is provided as an organic silicon adhesive heat conducting potting compound.
6. A magnetically suspended electromagnet unit according to claim 1, wherein the protective layer is provided as a uv-resistant, anti-ageing protective layer.
7. A magnetically suspended electromagnet unit according to any one of claims 1 to 6, wherein heat dissipation channels are provided between the magnetically conductive rigid frame and the windings of the magnetically suspended electromagnet.
8. A method of encapsulating a magnetically levitated electromagnet according to claim 7, wherein the step of encapsulating the magnetically levitated electromagnet unit according to claim 7 by the method of encapsulating comprises the steps of:
step one, manufacturing a magnetic suspension electromagnet unit: the iron core block is dipped in insulating varnish or is embedded in the quenched and tempered iron core after being cast and shaped, so that a magnetic-conducting rigid framework is formed; winding a magnetic suspension electromagnet winding by winding an aluminum flat wire or a copper flat wire through sintering a single glass fiber corona-resistant polyimide film; nesting a magnetic suspension electromagnet winding on a magnetic conduction rigid framework to form a magnetic suspension electromagnet unit;
step two, dipping: dipping 200-grade impregnating varnish by adopting a VPI process and curing;
step three, pouring: placing the whole immersed and cured magnetic suspension electromagnet unit into a casting mold, casting organic silicon high-adhesion heat-conducting pouring sealant on the outer surface of the magnetic suspension electromagnet unit by using a vacuum casting machine, and correcting the surface of a casting layer after casting and demolding;
step four, spraying a protective layer: and spraying an ultraviolet-resistant anti-aging protective layer on the surface of the casting layer of the magnetic suspension electromagnet unit after the casting is finished, and finishing the packaging of the magnetic suspension electromagnet unit.
9. The packaging method according to claim 8, wherein the magnetically levitated electromagnet unit is vacuum degassed under a vacuum of 100pa to 150pa for 30 minutes before impregnation.
10. The packaging method according to claim 8, wherein the curing of the magnetically levitated electromagnet unit after the dipping is performed by: the method adopts a rotary baking process, and the mixture is cured in an oven at 165 +/-5 ℃ at the differential rotation speed of 5-8 revolutions per minute.
CN202111640490.8A 2021-12-29 2021-12-29 Magnetic suspension electromagnet unit and packaging method thereof Pending CN114121402A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114724822A (en) * 2022-06-07 2022-07-08 悉瑞绿色电气(苏州)有限公司 Winding assembly, dry type transformer and manufacturing method of winding assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114724822A (en) * 2022-06-07 2022-07-08 悉瑞绿色电气(苏州)有限公司 Winding assembly, dry type transformer and manufacturing method of winding assembly

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