JP5463663B2 - Stator structure and stator manufacturing method - Google Patents

Description

  The present invention relates to a technique for insulatingly covering an end portion of a stator used in a rotating electrical machine, and more particularly to a method for insulating a connecting wire and a terminal portion of a coil using a sealing material.

A coil end of a stator used in a rotating electric machine is generally subjected to varnish or resin molding for the purpose of ensuring insulation after a bus bar for connecting the coil and the terminal portions of the coil is joined.
However, when a varnish is used, the varnish scatters to an unnecessary portion, so that there is a problem that it is necessary to perform trimming after applying the varnish. Therefore, the number of processes increases, which may hinder cost reduction of the stator.
On the other hand, when performing resin molding, it is necessary to insert-mold the stator, so the resin used for the mold is required to have insulation, fluidity, thermal conductivity, etc. There is a risk of hindering down. Moreover, if the coil end is resin-molded, there is a problem that the heat dissipation of the coil and the bus bar is lowered.

In addition, various methods have been studied as a method for ensuring insulation on the coil end side of the stator.
In patent document 1, the manufacturing method of the concentrated power distribution member of the thin brushless motor for vehicles is indicated.
The coil end of the stator of the rotating electrical machine needs to ensure insulation and is required to be thin. In Patent Document 1, an insulating holder holding a bus bar serving as a concentrated power distribution member provided at a coil end is resin-molded by insert molding. Insulation is ensured by resin molding of the central power distribution member, and compactness and easy assembly are realized by integrating the U-phase, V-phase, and W-phase bus bars.

Patent Document 2 discloses a stator structure of a motor.
In the space surrounded by the outer partition wall and the inner partition wall provided on the inner peripheral side of the stator, the ends of the windings are connected to each other with a connection terminal and then potted with a synthetic resin in an annular shape to ensure insulation. Yes.
The insulator is extended to form an outer partition and an inner partition, and a potting material is poured into the interior to insulate the inner space, thereby enabling insulation of the connection terminal portion. Since the outer partition wall and the inner partition wall are not provided on the coil end side, a thin motor can be formed without increasing the thickness on the coil end side.

JP 2003-134758 A JP 2008-17484 A

However, the techniques described in Patent Document 1 and Patent Document 2 are considered to have the problems described below.
The concentrated power distribution member of Patent Document 1 does not disclose a method for ensuring insulation of a connection portion between the concentrated power distribution member and a terminal extended from the coil. Therefore, it is considered that this part needs to be varnished or resin-molded at the coil end as usual. In this case, the conventional problems described above cannot be avoided. In other words, varnish coating requires trimming, and the number of processes increases, making it difficult to reduce costs.If the coil end is resin-molded, the entire coil end is resin-molded, so the heat dissipation of the coil and bus bar is sacrificed. There is also a problem that cost reduction is difficult.

Regarding the stator structure of Patent Document 2, the connection portion is brought to the inner peripheral side of the stator, and a space partitioned by a partition wall is provided in the portion, and potting is performed. Since the protrusion is provided, interference becomes a problem depending on the shape of the rotor.
In addition, it is necessary to use an insulator having a complicated shape and the number of parts is large, which may increase the manufacturing cost.

  Accordingly, an object of the present invention is to provide a stator structure and a stator manufacturing method with low cost and high heat dissipation in order to solve such problems.

In order to achieve the above object, the stator structure according to the present invention has the following characteristics.
(1) A stator in which a connection terminal of a coil provided in the stator core protrudes from at least one end face of both ends of the stator core, the connection terminal is connected by a connection line, and the coil forms an electric circuit. In the structure, the connection wire is subjected to an insulation coating treatment, and a joint portion between the connection wire and the connection terminal of the coil is insulated with a sealing material, and the sealing material is used by an electric motor. And having oil resistance necessary when the connecting wire is cooled by oil, the sealing material is a protective cap encapsulating a thermosetting resin, and the protective cap is attached to the joint portion. After covering, the joint is heated by energizing from the neutral point terminal, the thermosetting resin is cured, the joint is insulated, and the protective cap is attached to the joint. Weld It consists of a welded portion and a resin coating covering the outside of the welded portion, has a notch in the center, and has a cross-section formed in a horseshoe shape. It has a rigidity that can be held so as not to be displaced from the joint after being inserted into the joint .

In order to achieve the above object, the stator manufacturing method according to the present invention has the following characteristics.
( 2 ) In the stator manufacturing method in which a connection terminal included in a coil protruding from at least one end face of each end of the stator core is connected using a connection line to form an electric circuit, the connection terminal and the connection Wires are joined to form a joint, a protective cap encapsulating a thermosetting resin is inserted into the joint, the coil is heated by energizing from a neutral point terminal, and the thermosetting resin is It is cured and insulated, and the protective cap has oil resistance required when an electric motor is used and the connecting wire is cooled by oil, and the protective cap is welded to the joint. And a resin coating that covers the outside of the welded portion, has a notch in the center, and is formed in a horseshoe shape in cross section. After the cap is inserted into the joint, it has a rigidity that can be held so as not to be displaced from the joint, and after the protective cap is put on the joint, the neutral point terminal portion is energized. The bonding portion is heated and the welded portion is cured .

With the stator structure according to the present invention having such characteristics, the following operations and effects can be obtained.
First, in the invention described in (1), a connection terminal of a coil provided in the stator core protrudes from at least one end face of both ends of the stator core, the connection terminal is connected by a connection line, and the coil is electrically connected. In the stator structure forming the circuit, the connection line is subjected to an insulation coating process, and the joint between the connection line and the connection terminal of the coil is covered with an insulating material.

The connection terminals of the coils included in the stator are connected by connection wires that have been insulation-coated, and the joints between the coil connection terminals and the connection wires are insulated by a sealing material. That is, only the end portion of the connection line is covered with the sealing material. For this reason, the joint portion between the connection line and the coil connection terminal is sufficiently insulated by the sealing material.
And only the joint provided at the end of the connection line is sealed with the sealing material, but the other part is not molded with resin, and the coil end part is not resin-molded with respect to the coil. High heat dissipation can be ensured as compared with the case where the entire coil end portion is resin-molded.
Further, since only the joint portion is sealed as compared with the case where the entire coil end is resin-molded, the amount of resin is small. Further, since insert molding is not required as in the case of resin molding of the entire coil end, it is possible to widen the range of selection of the resin as long as the fluidity of the resin does not have to be ensured, which can contribute to cost reduction.

Moreover, sealing material is a protective cap enclosing the thermosetting resin, after being covered with a protective cap at the junction, the junction is heated by energizing from the neutral point terminal portion, a thermosetting resin Is cured, and the joint is insulated.
Since the sealing cap is simply covered with a sealing cap encapsulated with a thermosetting resin, the operation is relatively easy. In addition, the neutral point terminal of the stator is energized and the thermosetting resin is melted and cured by heating the stator to complete the sealing, thus reducing the cost of the stator without the need for complicated processes. Can contribute.

Further , in the stator structure described in (1), both ends of the connection line are bent, and the joint portion protrudes in a direction away from the end face of the stator core.
For this reason, the efficiency of work, such as providing a sealing part or covering a protective cap, is improved, which contributes to cost reduction.
Providing a protrusion on the coil end side of the stator is not desirable because it results in an increase in the coil end, but avoiding an increase in coil end by tilting the connecting wires and protrusions toward the stator end face. Is possible.

Moreover, the following operation | movement and an effect are acquired by the stator manufacturing method by this invention which has such a characteristic.
First, the connection terminals of the coil projecting from at least one of the end faces at both ends of the stator core, and connected by a connection line, in a stator manufacturing method for forming an electrical circuit, and a connection line and the connection terminal Joining to form a joint, and bringing the stator core close to a mold having a plurality of injection holes for covering the joint, and injecting the sealing material into the injection hole to solidify the sealing material Thus, the joint is insulated with a sealing material.

It is possible to easily seal a plurality of connecting portions by using a method of inserting a connecting portion into an injection hole and injecting a sealing material into the injection hole using a mold.
Since the connection part is often used on one end face of the end of the stator, the stator end face on the side from which the connection part protrudes is placed close to the mold, and the connection part is inserted into the sealing hole. By injecting the sealing material, the connection portion can be sealed with the sealing material.
By using this method, the stator structure described in (1) can be manufactured, and a manufacturing method that realizes a stator structure with high heat dissipation at low cost can be provided.

Moreover, the invention described in ( 2 ) is a method for manufacturing a stator in which an electrical circuit is formed by connecting connection terminals of coils protruding from at least one end face of both ends of a stator core using connection wires. In the above, the connection terminal and the connection line are joined to form a joint, a protective cap encapsulating a thermosetting resin is inserted into the joint, and the coil is heated by energizing from the neutral point terminal, and is thermoset. The insulating resin is cured and cured.
By using such a manufacturing method, it becomes easy to manufacture the stator structure described in ( 1 ).

First , the first reference embodiment will be described.
(First reference form)
FIG. 1 is a perspective view of the stator according to the first reference embodiment. For convenience of explanation, the shape of the split stator unit is simplified, and the state before connecting the connection lines is shown.
The stator 10 is a split-type stator, and includes a split-type stator unit 18, an outer ring 15 provided on the outer periphery thereof, and a bus bar holder 16.
FIG. 2A is a perspective view of the split stator core. FIG. 2B is a perspective view showing a state where the insulator is arranged on the split stator core. FIG. 2 (c) is a perspective view showing a state in which the coil is arranged on the split stator core. FIG. 2D is a perspective view showing a state where the coil portion of the split stator core is resin-molded.
The split stator core 11 is formed by stacking electromagnetic steel plates. Teeth portion 11a is formed in stator core 11, and insulator 12 is inserted. The insulator 12 includes a flat base portion 12 a, an outer peripheral portion 12 b formed in a shape along the outer periphery of the tooth portion 11 a, and a support column 12 c that supports the inner peripheral surface of the coil 13.

After the insulator 12 is inserted and arranged in the stator core 11, the coil 13 is inserted, and the coil 13 is arranged as shown in FIG.
The coil 13 is a flat conductor bent edgewise and includes a first connection terminal portion 13a and a second connection terminal portion 13b for connection to the outside.
With the insulator 12 and the coil 13 provided on the stator core 11, the outer peripheral portion of the coil 13 is resin-molded. The state is shown in FIG. 2D. The resin mold portion 14 is formed on the outer peripheral surface of the coil 13, and the support convex portion 14a is formed on the protruding side of the first connection terminal portion 13a and the second connection terminal portion 13b. Is formed. A first bus bar groove 14b and a second bus bar groove 14c are formed in the support convex portion 14a.

The split stator units 18 formed in this way are arranged in a cylindrical shape and the outer ring 15 is fitted. Since the number of divisions is 18 in the first reference embodiment, 18 divided stator units 18 are arranged side by side so that the inner periphery of the heated outer ring 15 corresponds to the outer periphery of the split stator unit 18. Then, the outer ring 15 is cooled to perform tightening.
In this way, the split stator unit 18 is held by the outer ring 15. Thereafter, the bus bar holder 16 is disposed at the end of the stator 10. Thereafter, the first connection terminal portion 13 a and the second connection terminal portion 13 b provided in the coil 13 are connected to form the U phase, the V phase, and the W phase of the stator 10. Thus, the stator 10 shown in FIG. 1 is formed.

FIG. 3 is a perspective view showing a state in which the coil terminals are connected by connection wires. In FIG. 3, the split stator unit 18 is referred to as a first unit 18a, a second unit 18b, a third unit 18c, and a fourth unit 18d for convenience.
The connection line 25 is a line for electrically connecting the first connection terminal portion 13a and the second connection terminal portion 13b protruding from the split stator unit 18, and around the metal bus bar having good conductivity such as copper. A thick PPS (Poly-phenylenesulfide) material is used for insulation coating.
The connection of the connection line 25 and the first connection terminal portion 13a or the second connection terminal portion 13b of the coil 13 is electrically connected by a bonding method such as brazing or electron beam welding.
As shown in FIG. 3, the connection state is such that the first connection terminal portion 13a protruding from the first unit 18a and the second connection terminal portion 13b protruding from the fourth unit 18d are connected at both ends of the connection line 25, respectively. doing.

The connection line 25 connects the split stator units 18 to each other. A support convex portion 14a is formed on the upper part of the split stator unit 18, and a first bus bar groove 14b and a second bus bar groove 14c are provided. For this reason, the connection line 25 connected to the first connection terminal portion 13a of the first unit 18a is supported by the second bus bar groove 14c of the second unit 18b, supported by the first bus bar groove 14b of the third unit 18c, It will be connected to the second connection terminal portion 13b of the fourth unit 18d.
FIG. 4 shows a top view of the mold. FIG. 5 shows details of the mold.
The mold 50 seals the connecting portion (hereinafter referred to as the joint portion 26) between the connecting wire 25 provided at the coil end of the stator 10 and the first connecting terminal portion 13a or the second connecting terminal portion 13b with a potting material. Used when stopping.

An injection groove 51 is formed in the mold 50, and the injection groove 51 includes an injection hole 52, a sealing material 53, and an escape groove 54.
A potting material as a sealing material is injected into the injection hole 52. The potting material only needs to have insulating properties, heat resistance, and oil resistance. For example, a silicon resin or an epoxy resin can be considered.
The sealing material 53 includes a held portion 53a that is fitted into a seal groove 50a formed in the mold 50, and the sealing material leaks from the injection hole 52 when the held portion 53a is fitted into the seal groove 50a. It prevents it from coming out. As the sealing material 53, it is desirable to employ a heat-resistant and elastic material such as silicon rubber having excellent releasability. The hardness is less than 70A Shore hardness and is relatively soft.

FIG. 6 is a perspective view showing a state where the connection portion between the connection line and the coil terminal is sealed.
Sealing of the joint portion 26 is performed in a situation as shown in FIG. The mold 50 shown in FIGS. 4 and 5 is brought close to the mold 50 with the surface to which the connection line 25 of the stator 10 is bonded facing down.
The connection line 25 joined to the first connection terminal portion 13 a and the second connection terminal portion 13 b is accommodated in the injection groove 51. The connecting wire 25 is sandwiched between grooves provided in the sealing material 53, and the sealing material 53 comes into contact with and closely contacts the surface of the connecting wire 25.
Thereafter, the sealing material is injected into the injection hole 52 of the mold 50 and heated by a heater (not shown) provided in the mold 50 to cure the sealing material, so that the sealing portion 20 as shown in FIG. Form. The sealing portion 20 is formed so as to cover the joint portion 26, and insulates the joint portion 26 formed by the first connection terminal portion 13 a and the second connection terminal portion 13 b and the connection line 25.

Since the stator 10 of the first reference form exhibits the above-described configuration and operation, the following effects can be achieved.
First, the stator 10 of the first reference form is easy to ensure heat dissipation.
The stator 10 and the stator structure of the first reference form are the first connection terminal portion 13a and the second connection terminal portion that the coil 13 provided in the stator core 11 has on at least one end face of the stator core 11. 13b protrudes, the first connection terminal portion 13a and the second connection terminal portion 13b are connected by a connection line 25, and in the stator structure in which the coil 13 forms an electric circuit, the connection line 25 is subjected to an insulation coating process. A joint portion 26 between the connection wire 25 and the first connection terminal portion 13a or the second connection terminal portion 13b of the coil 13 is covered with an insulating material.

By covering the first connecting terminal portion 13a and the second connecting terminal portion 13b protruding from the end face of the stator 10 and the joint portion 26 of the connecting wire 25 with the sealing portion 20, insulation of the coil end of the stator 10 is ensured. ing. For this reason, it is excellent in heat dissipation compared with the case which does not seal with a sealing material except the both ends of the connecting wire 25, and a coil end is resin-molded.
This is cooled by the oil supplied when rotating as air or an electric motor because there is a space between the connecting wires 25 connected to the end of the stator 10. If the coil end is resin-molded, it depends on the thermal conductivity of the resin used for the resin mold, so a resin with good thermal conductivity must be selected. However, since the coil end is molded by insert molding, it is necessary to ensure the fluidity of the resin, and it is difficult to adopt a method of increasing the filler in order to improve the thermal conductivity.

On the other hand, if the joint part 26 of the coil 13 and the connection line 25 is covered with the sealing part 20 and the minimum part is protected with an insulating sealing agent as in the first reference embodiment, the insulation-coated connection line is provided. 25 is in direct contact with air or oil, and the heat dissipation of the stator 10 can be improved.
In addition, the stator 10 according to the first reference embodiment also has a point that the material selection range of the sealing portion 20 used for the joint portion 26 is widened.
As described above, when the coil end of the stator 10 is resin-molded, it is necessary to insert-mold, and therefore the resin fluidity is required. However, since only the joint portions 26 formed at both ends of the connection line 25 need to be sealed with the sealing portion 20, the resin used for potting does not require fluidity.
For this reason, it is possible to widen the range of material selection. Further, it is possible to reduce the total amount of resin, which contributes to cost reduction.

A second reference embodiment will be described next.
(Second reference form)
In FIG. 7, the perspective view of the stator of the 2nd reference form is shown. FIG. 8 shows an enlarged view of FIG.
The stator 10 of the second reference form has substantially the same configuration as the stator 10 of the first reference form, but the shape of the connection line 25 is different.
The connection wire 25 used in the second reference form is a joint portion 26 connected to the first connection terminal portion 13 a or the second connection terminal portion 13 b of the coil 13, that is, bent at both ends of the connection wire 25 to be a bent portion 25 a. Is formed.
Therefore, as shown in FIG. 8, the bent portion 25 a is bent at a right angle with respect to the connecting line 25, and the bent portion 25 a is arranged perpendicular to the end face of the stator 10 when joined to the stator 10. become.

After the first connection terminal portion 13a and the second connection terminal portion 13b of the stator 10 and the connection line 25 are joined, the joint portion 26 is potted.
FIG. 9 shows a top view of the mold. FIG. 10 is a perspective view in which a sealing portion is formed at the joint portion. This corresponds to FIG.
Injection molds 52 are formed in the mold 50 by the number of the joint portions 26 formed in the stator 10. The potting material is injected into the mold 50, the stator 10 is brought close to the mold 50, and the joint portion 26 is inserted to a predetermined position of the injection hole 52, so that the sealing portion 20 is placed on the outer peripheral surface of the joint portion 26. Form.
In this way, the sealing part 20 as shown in FIG. 10 is formed, and the insulation treatment of the coil end of the stator 10 is completed.

Since the 2nd reference form shows the above-mentioned composition and operation, there is an effect which is explained below.
The second reference form can obtain substantially the same effect as the first reference form. However, it differs in the points described below.
First, since the structure of the mold 50 can be simplified, the cost of mold production can be reduced, and since it is not necessary to provide the sealing material 53 or the like, the maintenance is facilitated.
Further, there is an advantage that it becomes easy to completely seal the joint portion 26 with the sealing portion 20.
Although the thickness of the coil end of the stator 10 is increased by protruding the bent portion 25a of the connecting wire 25 to the coil end of the stator 10, as described in the first reference embodiment, The thickness can be reduced by tilting the first connection terminal portion 13a and the second connection terminal portion 13b.

It will be described implementation form of the present invention.
(Implementation form)
Implementation form is substantially the same as that of the first reference embodiment. However, since the sealing method of the junction part 26 differs, it demonstrates below.
FIG. 11 is an enlarged perspective view of the coil end of the stator.
Junction 26 between the connecting line 25 provided on the coil end of the stator 10 of the implementation forms the first connection terminal portion 13a or the second connection terminal portions 13b are sealed by the protective cap 30.
The protective cap 30 includes a resin coating 31 that covers the outside and a welded portion 32 that is prepared on the inside.

The resin coating 31 may be a resin material for preventing an impact from the outside, and preferably has an insulating property. Moreover, it is desirable to have a certain amount of elasticity and rigidity. It suffices if the rigidity or elasticity of the resin coating 31 itself is sufficient to hold the protective cap 30 so as not to deviate from the joint 26 when inserted into the joint 26. It has a horseshoe-shaped cross section.
The welding part 32 is a thermosetting resin, and a certain amount is prepared inside the resin coating 31. The material may be an epoxy resin. A cut is provided in the center, and the cut is provided with a width sufficient to sandwich the joint 26.

The protective cap 30 is inserted into the joint portion 26 provided at the coil end of the stator 10 so as to sandwich the joint portion 26, and then energized from the neutral point terminal portion provided in the stator 10. 30 welded portions 32 are melted and cured.
By applying a high voltage, the coil 13 provided in the stator 10 generates heat. In particular, the junction 26 has a high electrical resistance. The joint 26 is welded or brazed with TIG or the like, but an oxide layer is formed in the welded portion or fine bubbles are contained, compared to the main body of the connecting wire 25 or the main body of the coil 13. Electric resistance tends to increase.
For this reason, it is easy to generate heat around the joint portion 26, and the resin coating 31 of the protective cap 30 is melted and cured using this generated heat.

Implementation form exhibits the above-described configuration and operation, an effect as described below.
First, it is possible to easily insulate the joint .
In the stator 10 or the stator structure of the implementation form, the sealing material is a protective cap 30 enclosing a thermosetting resin, after covered with a protective cap 30 to the junction 26, is energized from the neutral point terminal portion In this way, the joining portion 26 generates heat, and the thermosetting resin is cured to be insulated.
Insulation treatment of the joint portion 26 is performed so that the protective cap 30 is placed on the joint portion 26 and then the neutral point terminal portion is energized to heat the joint portion 26 and complete the insulation coating. That is, it is possible to reduce the cost in that a mold is not required unlike the first reference form and the second reference form.

A third reference embodiment will be described next.
( 3rd reference form)
The third reference form is almost the same as the configuration of the second reference form. However, since the sealing method of the junction part 26 differs, it demonstrates below.
Junction 26 of the third reference embodiment differs from the second reference embodiment in that sealing by the protective cap 30 of the implementation forms.
FIG. 12 is an enlarged perspective view of the coil end of the stator according to the third reference embodiment.
A joint portion 26 between the connection wire 25 provided at the coil end of the stator 10 and the first connection terminal portion 13 a or the second connection terminal portion 13 b is provided in parallel to the axial direction of the stator 10. This is because both ends of the connecting wire 25 are bent into an L shape and a bent portion 25a is provided.

Then, after the protective cap 30 is inserted into the joint portion 26 and disposed, the neutral terminal portion of the stator 10 is energized to heat the joint portion 26 and complete the insulation coating.
In this way, the same effect as implementation embodiment can be obtained.
Moreover, as different implementation forms include that easily work that insert the protective cap 30 to the junction 26.
In addition, there is an advantage that the joint portion 26 is easily sealed reliably.

Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented.
For example, the first reference embodiment to the third reference embodiment and the embodiment have portions described by exemplifying materials, but can be replaced as long as they can obtain equivalent performance.
The first reference embodiment to third reference embodiment, in and exemplary embodiment, the stator 10 is described as a split-type stator core, it can also be used in integrated stator core.

It is a perspective view of a stator of the 1st reference form. (A) It is a perspective view of the split type stator core of a 1st reference form. (B) It is a perspective view in the state where the insulator was arranged in the split type stator core of the 1st reference form. (C) It is a perspective view of the state which has arrange | positioned the coil to the split type | mold stator core of the 1st reference form. (D) It is a perspective view of the state which resin-molded the coil part of the split type stator core of the 1st reference form. It is a perspective view which shows a mode that the terminal of a coil is connected by the connection wire of a 1st reference form. It is a top view of the metal mold | die of a 1st reference form. It is a top view which shows the detail of the metal mold | die of a 1st reference form. It is the perspective view which showed a mode that the connection part of the connection wire and the terminal of a coil of the 1st reference form was sealed. It is a perspective view of a stator of the 2nd reference form. It is an enlarged view of FIG. 7 of a 2nd reference form. It is a top view of the metal mold | die of a 2nd reference form. It is a perspective view in which the sealing part is formed in the junction part of the 2nd reference form. The implementation form is an enlarged perspective view of the coil end of the stator. It is an expansion perspective view of the coil end of a stator of the 3rd reference form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator core 11a Teeth part 12 Insulator 12a Base part 12b Outer peripheral part 12c Support pillar 13 Coil 13a First connection terminal part 13b Second connection terminal part 14 Resin mold part 14a Support convex part 14b First bus bar groove 14c First 2 Bus bar groove 15 Outer ring 16 Bus bar holder 18 Split type stator unit 20 Sealing part 25 Connection line 25a Bending part 26 Joining part 30 Protective cap 31 Resin coating 32 Welding part 50 Mold 50a Seal groove 51 Injection groove 52 Injection hole 53 Seal Material 53a Holding part 54 Relief groove

Claims (2)

In a stator structure in which a connection terminal of a coil provided in the stator core protrudes from at least one end face of both ends of the stator core, the connection terminal is connected by a connection line, and the coil forms an electric circuit.
The connection line is subjected to an insulation coating process, and a joint portion between the connection line and the connection terminal of the coil is covered with an insulating material,
The sealing material has oil resistance required when an electric motor is used and the connecting wire is cooled by oil,
The sealing material is a protective cap encapsulating a thermosetting resin, and after the protective cap is put on the joint, the joint is heated by energizing from a neutral point terminal, and the heat The curable resin is cured and the joint is insulated;
The protective cap comprises a welded portion welded to the joint portion and a resin coating covering the outside of the welded portion, has a notch in the center, and has a cross-section formed in a horseshoe shape, the resin coating Has rigidity that can be held so as not to deviate from the joint part after inserting the protective cap into the joint part, together with insulation.
Stator structure characterized by In the stator manufacturing method in which the connection terminal of the coil protruding from at least one end face of both ends of the stator core is connected using a connection line to form an electric circuit.
Joining the connection terminal and the connection line to form a joint, inserting a protective cap encapsulating a thermosetting resin into the joint, and heating the coil by energizing from the neutral point terminal, Curing the thermosetting resin to insulate,
The protective cap has oil resistance required when an electric motor is used and the connecting wire is cooled by oil;
The protective cap comprises a welded portion welded to the joint portion and a resin coating covering the outside of the welded portion, has a notch in the center, and has a cross-section formed in a horseshoe shape, the resin coating Has rigidity that can be held so as not to deviate from the joint part after inserting the protective cap into the joint part, together with insulation.
After the protective cap is put on the joint, the joint is heated by energizing from a neutral point terminal, and the weld is cured,
The stator manufacturing method characterized by these.

Images