KR20180034983A - Method for winding rectangular coil of high density for electric motor - Google Patents

Abstract

The present invention relates to a method for winding a rectangular coil of high density for an electric motor. The method of the present invention comprises the steps of: fabricating a rectangular coil by coating a surface of a metal conductor elongated in a longitudinal direction with a high lubrication-self-bonding coating agent such that a modified PAI insulating varnish having a high content of ceramics is coated with a multilayer structure; performing a ceramic insulating coating on a surface of a split slot for an electric motor, corresponding to one winding tooth; winding the rectangular coil in the split slot in a predetermined number of times such that tension of a predetermined range is applied; performing a primary heat treatment on the wound split slot; arranging the split slots in an annular shape to assemble the same with one stator module; and performing a secondary heat treatment on the assembled stator module. Accordingly, the present invention maximizes the space factor in a high-density winding method to enable high efficiency of an electric motor; more efficiently removes micro-pores that are difficult to remove in the conventional insulating impregnation method, to improve insulating performance and long-term reliability of the electric motor; and switches an insulating guide used for a slot core to a ceramic coating insulating method to enlarge the space required for high-density winding, thereby improving efficiency and performance of the electric motor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of winding high-

The present invention relates to a high-density winding method of a rectangular-type coil for an electric motor capable of high-efficiency operation of a motor by a high density winding method.

In recent years, electric power equipment and electric parts have been continuously developed to improve energy efficiency, miniaturization and long-term reliability. In particular, in order to miniaturize motors and to increase efficiency, it is necessary to wind as many coils as possible in slots (rotors or stator) It is important.

However, if the winding density of the winding increases, the coating surface of the coil is damaged due to the increase of the surface frictional force, thereby causing a problem of insulation reliability. Therefore, without developing a new material having surface lubrication and flexibility and durability as an insulating coil In order to overcome this difficulty, it has recently been attempted to apply an organic or inorganic hybrid varnish material obtained by fusing nano-sized colloidal ceramics to a polymer varnish. However, in the case of adding a large amount of liquid colloid ceramic to a resin having a high molecular weight, the insulation reliability is greatly reduced due to the occurrence of cracks due to surface damage occurring at high density winding.

On the other hand, motor coils are required to be square-shaped for miniaturization and high integration. In this case, there is a problem that the frictional contact surface becomes larger in the winding operation than the circular shape in structure, so that a large working force is required But it has a limit to increase the winding. In addition, when each corner of the coil is structurally formed, the corner of the curved portion is sharpened, and mechanical damages easily occur on the coating surface during the operation. According to this situation, the existing technology is classified into the insulation material of the motor coil as the primer material having excellent adhesion with the metal material, the main insulating material having excellent mechanical strength and insulation, and the top coating material requiring the high lubrication property But it has problems such as difficulty in controlling the thickness of the coating layer and the multiplicity of work.

Until recently, the related patents related to methods and technology for improving the heat resistance, corona, and processability of enamel wire in relation to high density winding technology, and related domestic and foreign key patents (Japanese Patent Application Publication No. 2005-0096613, Japanese Patent Application No. 2001-0017950, 1984-0007648, US5393612) However, the technical approach to improve the motor load factor has not yet been developed so that the technology can be actively replaced with a small number of applications.

PAI / PI insulation varnishes of the highest heat resistance class have been used for premium class high efficiency motors and highly integrated power devices. However, in advanced countries, in order to improve the performance of insulation varnishes, nanocomposite insulation varnish Has been developed and commercial applications have been made. In recent years, development of nanohybrid varnish insulated square coil technology has been proceeded to manufacture high performance products.

An example of making a copolymer through a covalent bond with PAI with low surface energy polydimethylsiloxane (PDMS) has been disclosed for the development of a topcoat material with high lubrication-self-adhesion properties. When chemical substances with different surface energies are made into a single copolymer through covalent bonding, the phase separation can be effectively reduced. In addition, the triblock copolymer of PAI-PDMS-PAI among the copolymers has surface energy lowered by PDMS exposed on the surface, and is lubricated and can be self-fused because it does not exist alone.

The need for functional primer layer insulation materials, casting materials, and high-lubrication top coating materials has been emphasized, and commercial applications have been made, and hybrid varnishes having ceramics added thereto have been partially used. However, The development of specific technology for the process or design element for increasing the density of the winding more efficiently in the application of the method is still insufficient.

US 20130069474 A1 US 20090167475 A1

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-density winding method of a square-shaped coil for a motor capable of suppressing micro-pores occurring during high-density progression as well as winding high density.

According to another aspect of the present invention, there is provided a high-density winding method of a rectangular-type coil for a motor, the method comprising the steps of: coating a surface of a metal conductor, which is long in the longitudinal direction, with a multilayered structure of a modified PAI insulating varnish having a high- Forming a rectangular coil by coating with a high-lubricating-self-bonding coating agent; Performing a ceramic insulating coating on a surface of a split slot for a motor corresponding to one winding; Winding the rectangular coil in a predetermined number of times so that a predetermined range of tension is applied to the divided slot; Performing a primary heat treatment on the wound divided slot; Arranging a plurality of the divided slots in an annular shape and assembling them into one stator module; And performing a secondary heat treatment on the assembled stator module.

According to the present invention, it is possible to increase the efficiency of the motor by maximally increasing the drop ratio in a high-density winding manner and to remove the micropores which are difficult to remove by the conventional insulating impregnation method by the self-bonding method, It is possible to improve the long-term reliability and improve the efficiency and performance of the motor by enlarging the space required for high-density winding by switching the insulation guide used in the slot core to the ceramic coating insulation method.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flowchart showing a high-density winding method of a rectangular-type coil for a motor according to a preferred embodiment of the present invention.
2 is a cross-sectional view of a conventional annular coil and a rectangular coil according to a preferred embodiment of the present invention applied to a motor slot.
Fig. 3 is an actual view of a coil prototype fabricated in the step of manufacturing the rectangular coil shown in Fig. 1;
4 is a cross-sectional view of a rectangular coil of a triple-layer insulated with a hybrid varnish according to a preferred embodiment of the present invention.
5 shows the structure of a polyamide-imide resin according to a preferred embodiment of the present invention.
FIG. 6 is a synthesis and capping scheme of AA-PAI and PUAI according to a preferred embodiment of the present invention. FIG.
Figure 7 shows the structure of a silicone copolymer or capped polyamide amide of a hybrid varnish for top coating according to a preferred embodiment of the present invention.
FIG. 8 is a photograph showing a divided slot according to a preferred embodiment of the present invention and a state where a rectangular coil is wound on the divided slot. FIG.
Figure 9 is a photograph of the stator module assembled in the assembling step of Figure 1;
FIG. 10 is a photograph of a state in which the primary heat treatment and the secondary heat treatment steps of FIG. 1 are performed. FIG.
FIG. 11 is a table and a table for explaining a dot percentage according to a winding angle and a working force of a rectangular coil according to a preferred embodiment of the present invention. FIG.
12 is a characteristic test graph of a square coil according to a preferred embodiment of the present invention.
13 is a graph showing an insulation performance test result of a split type slot in which a rectangular coil is wound with predetermined tension according to a preferred embodiment of the present invention.
FIG. 14 is a characteristic test graph of an electric motor in which a rectangular coil according to a preferred embodiment of the present invention includes a split slot wound with predetermined tension.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. Like reference numerals refer to like elements throughout the specification.

1 is a flowchart showing a high-density winding method of a rectangular-type coil for a motor according to a preferred embodiment of the present invention.

Hereinafter, a high-density winding method of a rectangular-type coil for a motor according to a preferred embodiment of the present invention will be described with reference to FIG.

First, a rectangular coil is manufactured by coating a surface of a long metal conductor with a high lubricant-self-bonding coating agent to coat a modified PAI insulating varnish having a high content of ceramics in a multilayer structure (S100).

FIG. 2 is a view for comparing cross-sections where a conventional annular coil and a rectangular coil manufactured by the step S100 of the present invention are applied to a motor slot, respectively. Referring to FIG. 2, when the number of coils of the same size is increased by increasing the degree of integration of the coils, the size (weight, volume) of the electric device can be reduced by reducing the size of the slots (10 to 15% You can increase the number to increase the output. The number of coils that can be inserted into the same space depends on how much the coil is coiled in the manufacturing process. In addition, if the coefficient of friction of the surface is low, the coils can be wound tightly even when the same force is applied. High lubricity coating material is important.

In other words, when the coil is wound around the stator of the motor, the ratio of the conventional annular shape shown in the center of FIG. 2 that can fill the space in the form of shape can be 60 to 70%. However, When the space is filled up, it is possible to stack up to 85%. As a result, the motor volume can be reduced by about 7 to 10% and the efficiency can be improved by about 10 to 25%.

FIG. 3 is an actual view of a coil prototype fabricated in the step of fabricating the rectangular coil shown in FIG. 1, and FIG. 4 is a cross-sectional view of a rectangular coil of a triple layer insulated with a hybrid varnish according to a preferred embodiment of the present invention.

Referring to FIGS. 3 and 4, a triple-layer rectangular coil insulated with a hybrid varnish according to a preferred embodiment of the present invention includes a metal conductor 10, a primer layer 20, a fissile layer 30, 40).

Specifically, the step (S100) of fabricating the prismatic coil includes a first step of forming a primer layer including a modified polyamideimide on the surface of a metal conductor formed to be long in the longitudinal direction, A second step of forming a refractory layer in which a modified polyamideimide containing a relatively large number of amide groups or a urethane group is mixed with a ceramic in a sol state and a second step in which a polydimethylsiloxane polyamideimide is contained on the surface of the refractory layer And a third step of forming a top coating layer.

In the first step, a hybrid varnish for a primer is coated on the surface of the metal conductor 10. The hybrid varnish for a primer is composed of oligo (oxyethylene glycol) (OEG), oligo (oxypropylene glycol) A hybrid varnish material in which sol-state ceramics are added in an amount of 1 to 10 wt% to a triblock-polyamideimide (triblock-PAI) copolymer modified with OPG, BPAoxyethylene glycol (BPA OEG) .

When such a flexible chemical structure is contained in the polymer chain, the thermal durability is lowered. Therefore, when the molecular weight of the polyamideimide molecule is being polymerized to 20,000 to 200,000, the glycol is introduced into the triblock-PAI copolymer structure .

At this time, the primer layer 20 formed on the metal interface, which should have excellent flexibility and adhesion, is poor in flexibility and adhesiveness when a high content of ceramics is prescribed. Therefore, colloidal silica sol is preferably added in a range of 1 to 10 wt%. If the sol state ceramic is less than 1 wt%, the effect of improving the thermal characteristics and the electrical characteristics is small, and if it exceeds 10 wt%, the flexibility and adhesiveness may be weak.

The primer layer 20 in the first step is a layer made of a hybrid varnish for a primer in which a modified polyamideimide and a ceramic in a sol state are mixed on the surface of the metal conductor 10 and the surface of the metal conductor 10 Is coated with a hybrid insulating material for a primer.

The hybrid varnish for primer is a triblock polyamide modified with oligo (oxyethylene glycol) (OEG), oligo (oxypropylene glycol) (OPG), BPAoxyethylene glycol (BPA OEG) (Triblock-PAI) copolymer is blended with 1 to 10 wt% of ceramic in a sol state.

At this time, the modified polyamide imide of the hybrid varnish for the primer is composed of polyamideimide at both ends, centering on one of oligo (oxyethylene glycol) (OEG), oligo (oxypropylene glycol) (OPG), BPAoxyethylene glycol When the flexible chemical structure as described above is contained in the polymer chain in a large amount, the thermal durability is lowered. Therefore, the molecular weight of the polyamideimide molecule is polymerized to about 20,000 to 200,000 It is preferable to add the above-mentioned glycols to synthesize a triblock-PAI copolymer structure.

In the first step, the metal conductor 10 may be formed of a single component or an alloy, which is long in the longitudinal direction. The metal conductor 10 may be made of copper, aluminum, One of them may be selectively applied to the wire, and a prismatic body may be formed by rolling to form a prismatic shape while being stretched using a square type hardness die.

5 shows the structure of a polyamide-imide resin according to a preferred embodiment of the present invention. The polyamide-imide resin having a thermal resistance grade of N and C is a chemical basic structure similar to that shown in FIG. 5, and has excellent heat resistance and insulation but has a high rigidity of resin. When a ceramic is added in a high amount, It is preferable to chemically rejuvenate the polyamideimide molecules so as to meet the required functionality and enable the addition of a high content of ceramics to each material.

That is, the diisocyanate compound and the acid anhydride compound are reacted at a predetermined stoichiometric ratio to synthesize polyamideimide having a certain amount of isocyan (-NCO) group at the terminal.

For reference, the diisocyanate compound is 4,4'-methylenebis (phenyl isocyanate), 2,4-methylenebis (phenyl isocyanate) )) And derivatives thereof may be selectively used. And the acid anhydride compound may optionally use one or more of TMA (trimellitic anhydride) and its derivatives.

These triblock-PAI copolymers are used for primer insulators using polyimide imide as the base resin. Capped AA-PAI and PUAI are used for the main flame retardant, and PDMS-PAI is used for the top coating insulation. It is preferable to hybridize the silane-treated sol-state ceramics by synthesizing a specific resin. In spite of the insulating varnish containing a high content (10 to 25 wt%) of ceramic in the sol state, the respective primer insulation, The flame retardant and top coating insulator were not difficult to fabricate hierarchically coated square type coils, and they can satisfy all the physical properties required in coils.

The second step is to form a pseudo-soft layer (30) comprising a primer layer (20) having a relatively large amide group or a urethane group-containing modified polyamideimide and a sol- to be.

The main fracture layer 30 formed in the second step is coated with a thick film on the surface of the primer layer 20 so as to have discharge durability (surge durability) in addition to basic insulation and mechanical rigidity. Therefore, it is possible to overcome these limitations by combining high contents of nano-level ceramics.

In the second step, the pseudo-softening layer 30 is a layer comprising a primer layer 20 having a relatively large amount of amide groups mixed with a modified polyamideimide and a sol-state ceramic.

Here, the modified polyamide imide having a relatively large number of amide groups or a urethane-containing adipic acid-polyamideimide (AA) having a relatively large amide group relative to the imide group is synthesized in the polyamideimide (PAI) -PAI) or at least one of alcohols, cellosolves, and amines is capped at both ends of the PUAI containing the glycol.

It is preferable that such a ceramics-based hybrid varnish contains 5 to 25 wt% of a ceramic in a sol state.

On the other hand, it is necessary to perform molecular manipulation of the polymer to prevent mechanical breakage, which is a problem when a high content of ceramic is added through the increase of flexibility of the resin of the core layer 30 and the strengthening of the interface between the silica and the resin in the core layer 30 .

Improvement of resin flexibility by controlling molecular weight and chemical structure of polyamide-imide resin (30) and improvement of crack resistance against external stress by strengthening interfacial bonding strength between silica and resin through surface treatment of silica nanoparticles are required .

In order to prevent adhesiveness and flexibility degradation in high solubility ceramics in the hybrid varnish, it is necessary to add some adipic acid (AA) and glycols in place of TMA to properly control the stiffness and flexibility of the polyamideimide chain, If the terminal structure of the amideimide resin is capped with various materials contributing to dispersion stabilization of the ceramic in the sol state, properties of the varnish insulating material can be secured even with a high content of ceramics.

6 is a synthesis and capping scheme of AA-PAI and PUAI according to a preferred embodiment of the present invention. Referring to FIG. 6, after the synthesis of AA-PAI or urethane-containing PUAI having a large number of amide groups relative to the imide group as a resin for the pearlescence layer 30, at least one of alcohols, cellosolves, Respectively.

When the resin modified by the modification of the main chain of the polymer and the capping of the polymer terminal is used as the resin of the main burning hybrid varnish, even if the surface-modified ceramic modified with various silanes is added in the amount of 5 ~ 25wt%, the hybrid varnish insulation It is possible to satisfy the physical property as material. If the sol state is less than 5 wt%, the physical properties of the hybrid varnish insulating material can not be satisfied. If it exceeds 25 wt%, the physical properties may deteriorate.

For the polyamideimide (including polyamideimide for primer) of the hybrid varnish, it is necessary to cap the polymer terminal to improve the dispersion stability, flexibility and adhesion of the sol state ceramic. As the capping agent suitable for the polyamideimide resin, Solvates and 12-amines.

The third step is a step of forming a top coating layer 40 made of hybrid varnish for top coating in which polydimethylsiloxane-polyamideimide and sol-state ceramics are mixed on the surface of the main fusing layer 30.

The top coating layer 40 in the third step is a layer formed by coating a hybrid coating for top coating in which polydimethylsiloxane-polyamideimide and sol-state ceramic are mixed on the surface of the mortar layer 30, The siloxane-polyamideimide preferably comprises a diblock copolymer (PAI-PDMS), a triblock copolymer (PAI-PDMS-PAI).

That is, the hybrid varnish for top coating can be used by synthesizing a polydimethylsiloxane-polyamideimide copolymer having a low surface tension. Such a silicone copolymer may be used in which polydimethylsiloxane is contained therein for self-bonding.

On the other hand, the top coating layer 40 in the third step is a layer made of a hybrid coating for top coating in which polydimethylsiloxane-polyamideimide and sol-state ceramics are mixed at 10 to 30 wt% , The polydimethylsiloxane-polyamide imide refers to a polydimethylsiloxane-polyamideimide copolymer. Such polydimethylsiloxane-polyamideimide copolymers include diblock copolymers (PAI-PDMS) and triblock copolymers (PAI-PDMS-PAI).

In order to develop a top coating material with high lubrication-self-adhesion property, a low surface energy polydimethylsiloxane (PDMS) can be copolymerized with polyamideimide by covalent bonding. When chemical substances with different surface energies are made into a single copolymer through covalent bonding, the phase separation can be effectively reduced. In addition, the triblock copolymer of PAI-PDMS-PAI among the copolymers has surface energy lowered by PDMS exposed on the surface, and is lubricated and can be self-fused because it does not exist alone.

Alumina, silica, boron nitride, or other electrically insulating ceramics may be used for the ceramics used in the sol of the present invention. That is, the sol-state ceramic in which the modified polyamide-imide and the amide group are relatively mixed with the modified polyamide-imide and the polydimethylsiloxane-polyamideimide, respectively, may be a ceramic selected from the group consisting of alumina, silica, boron nitride, .

7 is a structure of a silicone copolymer or capped polyamide amide of a hybrid varnish for top coating according to a preferred embodiment of the present invention. Referring to FIG. 7, it can be seen that the use of the resin capped in the polyamideimide terminal is effective for high lubricity.

As a result, it is possible to use hybrid polystyrene as a hybrid for top coating by mixing ceramic particles with polydimethylsiloxane-polyamideimide copolymer synthesized by using polyamide-imide resin-capped terminal. Do. However, the micro / nano composite material which can be used as the hybrid coating for the top coating may include nano-micro composite and nano hybrid material.

The hybrid varnish for top coating which forms the outermost surface layer of the rectangular coil has lubricity and can work in the production of the applied product and can be wound at high tension without mechanical damage of the insulating film, .

In addition, boron nitride (BN) has a solid lubrication due to its well-developed layered structure. It has excellent insulation characteristic due to its plate shape and high thermal conductivity, so it can rapidly dissipate heat generated during operation of power equipment, to be.

The hybrid varnish for top coating prepared by using BN (boron nitride) nano sol in addition to silica and alumina in the silicone-capped polyamideimide of FIG. 7 is capable of imparting high lubricity and has an effect of enhancing thermal conductivity when used as a top coating agent .

Particularly, it is preferable that the coating composition is a high-lubrication top coat which is hybridized with a ceramic content of 10 to 30 wt% in a sol state. At this time, when the ceramics in the sol state is less than 10 wt%, the thermal conductivity or the insulating property is low, and when it exceeds 30 wt%, the adhesion property of the hybrid varnish for top coating is deteriorated. Thus, even when the ceramic content is 10 wt% or more as a whole, it is possible to produce a rectangular coil having lubricity while satisfying physical properties as a coil insulating material.

In order to enhance the silica / resin interface strength, it is preferable to modify the surface of the ceramic in a sol state with silane. That is, when the ceramic surface is appropriately surface-treated with an organosilane having reactive groups such as amine, thiol, epoxide and carboxylic acid, physicochemical bonding is effectively formed at the organic / inorganic interface. In some cases, an additional oligomer amide- A method of inducing mechanical coupling is also used.

Next, a ceramic insulating coating is applied to the surface of the split slot for the electric motor corresponding to one winding (S200).

Here, in the step of performing the ceramic insulation coating (S200), a ceramic coating layer may be formed to a thickness ranging from 50 to 300 占 퐉 by using an epoxy-ceramic powder coating on the surface of the split slot.

That is, the ceramic coating layer formed by the step S200 of the present invention should have a relatively thicker coating layer than that of conventional insulating paper which forms a coating layer having a thickness ranging from 0.5 to 1 mm.

Next, in step S300, the prismatic coil is wound in the predetermined number of times so that a predetermined range of tension is applied to the divided slot.

Here, the step of winding (S300) may be performed by winding the rectangular coil in a divided slot corresponding to one winding value, as shown in Fig. 8, preferably by 80 to 90 turns with a tension of 5 kgf have.

FIG. 11 is a table and a diagram for explaining a dot rate according to a winding force and a working force of a square coil according to a preferred embodiment of the present invention.

Referring to FIG. 11, a rectangular coil having a width of 1.2 mm and a length of 0.8 mm is used to form first stator teeth of a T-shaped stator constituting one stator module and a second winding When the number of windings is '113' and the working force is '5kgf', assuming that the space between the teeth is filled, the dotted coil has a dot percentage of 100%, the number of windings is '80' to '85' If the force is '5kgf', it can be confirmed that the dotted coil has a dotted rate of 75%.

12 is a characteristic test graph of a square coil according to a preferred embodiment of the present invention. In the operation of winding a rectangular coil of a copper conductor on a motor stator, the change in electrical characteristics of the coil is measured while varying the tension to 2, 5, . In this case, when the pulling operation is performed by winding eld tension of 5 kgf, it is understood that the dielectric strength shows a stable characteristic of less than 5% in lowering ratio compared to the initial value.

13 is a graph showing the results of the insulation performance test of the split slot in which the rectangular coil is wound with predetermined tension according to the preferred embodiment of the present invention.

Referring to FIG. 13, the insulation performance of the micropores of the split slot fabricated with the winding tension of 5 kgf using 7 specimens was tested. As a result, the partial discharge value was stable at less than 3000pC at 1.2kV applied voltage .

FIG. 14 is a characteristic test graph of an electric motor including a divided slot in which a rectangular coil according to a preferred embodiment of the present invention is wound with predetermined tension.

Referring to FIG. 14, it can be seen that the square-shaped coil has a maximum efficiency of 93% in the case of a 1-kW class motor including split slots wound with a winding tension of 5 kgf.

Next, the first heat treatment for the divided slots wound in step S300 is performed (S400), a plurality of the divided slots are arranged in an annular shape and assembled into one stator module (S500) The secondary heat treatment for the stator module is performed (S600).

Here, the split slot may have a fan-shaped cross section cut in a horizontal direction X on the ground, and a cross section cut in a direction Y perpendicular to the ground surface may have a rectangular shape. FIG. 9 shows the assembled state of the stator module as one stator module.

At this time, the first heat treatment and the second heat treatment are preferably performed at a temperature of 180 to 220 degrees for 2 to 3 hours.

As described above, according to the present invention, the efficiency of the motor can be increased by maximally increasing the drop ratio in a high-density winding manner, and the micropores, which are difficult to remove by the conventional insulating impregnation method by the self- It is possible to improve the insulation performance of the motor and to improve the long-term reliability. By converting the insulation guide used in the slot core into the ceramic coating insulation method, it is possible to improve the efficiency and performance of the motor by enlarging the space required for high- There is an effect.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: metal conductor
20: Primer layer
30:
40: Top coating layer

Claims (9)

Forming a rectangular coil by coating a surface of a metal conductor formed in a long direction in a high lubricant-self-bonding coating agent so that a modified PAI insulating varnish having a high content of ceramic is coated in a multilayer structure;
Performing a ceramic insulation coating on a surface of a split slot for a motor corresponding to one winding;
Winding the rectangular coil in a predetermined number of times so that a predetermined range of tension is applied to the divided slot;
Performing a primary heat treatment on the wound divided slot;
Arranging a plurality of the divided slots in an annular shape and assembling them into one stator module; And
And performing a secondary heat treatment on the assembled stator module. The method according to claim 1,
The step of fabricating the square-
A first step of forming a primer layer including a modified polyamideimide on the surface of a metal conductor formed in a long direction;
A second step of forming a refractory layer in which a modified polyamideimide having a relatively large amide group or a urethane group on the surface of the primer layer is mixed with a ceramic in a sol state; And
And a third step of forming a top coating layer comprising a polydimethylsiloxane-polyamideimide on the surface of the main refractory layer. 3. The method of claim 2,
In the modified polyamide imide in the first step,
poly (trimethylene terephthalate), poly (trimethylene terephthalate), poly (trimethylene terephthalate), poly (trimethylene terephthalate), poly Wherein at least one of alcohols, cellosolves and amines is capped at both ends of an amide-triblock-PAI copolymer. 3. The method of claim 2,
In the modified polyamide imide in the second step,
Polyamide-imide (AA-PAI) wherein an adipic acid (AA) is synthesized in polyamide-imide (PAI) and has a relatively large amide group relative to an imide group. 3. The method of claim 2,
In the modified polyamide imide in the second step,
Characterized in that a high content of ceramics is formed by capping at least one of alcohols, cellosolves and amines at both ends of a urethane-modified polyamideimide (PUAI) into which glycols are introduced High - density winding method of rectangular coil. 3. The method of claim 2,
The polydimethylsiloxane-polyamideimide in the third step is a polyimide-
Diblock copolymer (PAI-PDMS) or triblock copolymer (PAI-PDMS-PAI). The method according to claim 1,
Wherein the first heat treatment and the second heat treatment are performed at a temperature of <
Wherein the annealing is performed at a temperature of 180 to 220 degrees for 2 to 3 hours. The method according to claim 1,
Wherein performing the ceramic insulation coating comprises:
Wherein a ceramic coating layer is formed on the surface of the split slot by using an epoxy-ceramic powder coating in a thickness range of 50 to 300 占 퐉. The method according to claim 1,
Wherein the step of winding comprises:
Wherein the prismatic coil is wound in the divided slot 80 to 90 times with a tension of 5 kgf.

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