KR102011820B1

KR102011820B1 - electrical rotating device

Info

Publication number: KR102011820B1
Application number: KR1020130059767A
Authority: KR
Inventors: 이순원; 원진국; 이지명; 김우원
Original assignee: 엘지전자 주식회사
Priority date: 2013-05-27
Filing date: 2013-05-27
Publication date: 2019-08-19
Also published as: KR20140139674A

Abstract

The present invention relates to an electric rotating device used in a relatively high voltage high current environment.
According to an embodiment of the present invention, a plurality of slots are formed along a circumferential direction; A plurality of hairpin conductors having a bent portion located in an axial upper portion of the stator core and having both ends inserted into different slots along the axial direction of the stator; A junction positioned axially below the stator core and electrically connecting the hairpin conductor ends to form a three-phase stator coil; And an electrical rotating device positioned below the stator core in an axial direction and electrically connected to at least some of the hairpin conductor ends to form a neutral point and a power connection point.

Description

Electric rotating device

The present invention relates to an electric rotating device used in a relatively high voltage high current environment.

Electric rotators include generators and motors. The generator refers to a device that generates electricity through the rotation of the rotor, and the motor refers to a device that rotates the rotor by supplying electricity, as opposed to the generator.

In other words, the generator may be referred to as a generator that is used to charge the electricity generated from the stator coil through the rotation of the rotor. The motor may be referred to as a motor that supplies electricity to drive a fan or a rotating body through the rotation of the rotor.

Electric rotary devices such as automotive alternators are required to improve power generation performance. This is because the current consumption is increased in the vehicle due to the safety control device or the air conditioner.

In the case of a motor for a vehicle, that is, a motor for driving a vehicle, similarly, an improvement in performance is required. It is because the performance of the electric vehicle which is gradually approaching the performance (output torque, maximum speed, etc.) of an engine drive vehicle is calculated | required gradually. In addition, the current consumption is increased due to the safety control device or the air conditioner, etc., and there may be a limit in improving the battery performance. Therefore, a more efficient vehicle driving motor needs to be provided.

To reflect this need, generators or motors are provided that include hairpin conductors. US Patent Publication No. US2006 / 0006757 discloses an example of a stator with a hairpin conductor.

The stator provided with the hairpin conductor is superior to the general stator provided with the coil having a circular cross section. This is because the occupancy of the conductors in the slots of the stator is relatively very high. In other words, it is possible to form a cross section of a conductor (a wire forming a coil) in a substantially rectangular shape, thereby minimizing voids in the slot, between the slot and the conductor, and between the conductor and the conductor.

Hereinafter, a stator of a general hairpin motor or a hairpin generator will be described with reference to FIGS. 1 to 6.

1 through 6 may be equally or similarly applied to the embodiments of the present invention, unless they are contradictory or exclusive to the embodiments of the present invention.

As shown in FIG. 1, the stator core 20 is formed of a magnetic material and includes a back yoke 21 forming a magnetic path and a tooth 22 protruding radially inward from the back yoke 21. A plurality of teeth 22 are formed along the circumferential direction, and FIG. 1 shows, for example, 72 teeth 22.

A slot 23 is formed between the tooth 22 and the tooth 22, and a conductor is inserted into the slot 23 substantially to form a stator coil. Similarly, the slot 23 is formed in plural along the circumferential direction of the stator core 22. Thus, the number of slots 23 may be equal to the number of teeth 22, and FIG. 1 shows, for example, 72 slots 23.

2 shows a pair of hairpin conductors 30 for forming a stator coil. One hairpin conductor 31, 35 has bends 32, 36. And ends 33, 34, 37, and 38 extending from the bends 32, 36, respectively.

Specifically, one hairpin conductor 31 has ends 33 and 34 on both sides of the bend 32, respectively, and the ends 33 and 34 are inserted into the slot 22 of the stator. . The ends 33, 34 are spaced apart from each other via the bend 32. Thus, when one end 33 is inserted into a particular slot, the other end 34 may be inserted into another slot having one pitch spacing.

The slot 23 may have a plurality of layers in the radial direction. For example, the plurality of layers may be formed of four or more layers and even layers. By four layers it is meant that four ends of the hairpin conductor are inserted in the radial direction. For convenience of description, the innermost layer in the radial direction may be referred to as one layer.

One end 33 of a particular hairpin conductor 31 of the pair of hairpin conductors 30 forms a layer of a specific slot (eg slot 1) and the other end 34 is one magnetic pole pitch spaced apart slot. Four layers (for example, slot 7) can be formed. At this time, one end 37 of the other hairpin conductor 35 forms two layers of a specific slot (slot 1), and the other end 38 forms three layers of slots (slot 7) spaced one pole pitch apart. can do.

Accordingly, the length of the bent portion 32 of the specific hairpin conductor 31 among the pair of hairpin conductors 30 is longer than the length of the bent portion 36 of the other hairpin conductor 35. That is, the separation distance between the ends by the bent portion 32 in any one hairpin conductor 30 may be different from each other. Such long hairpin conductors may be referred to as long hairpin conductors, and short hairpin conductors may be referred to as short hairpin conductors.

Meanwhile, all of the hairpin conductors 30 may be long hairpin conductors or short hairpin conductors. This is because, in order to form a three-phase stator coil, the pattern into which the hairpin conductor 30 is inserted may be variously modified. However, these conductors form the stator coil as a whole, and the shapes of the bent portions are the same or similar to each other. Therefore, such a hairpin conductor 30 may be referred to as a general hairpin conductor.

3 shows only the hairpin conductors 30 after the hairpin conductors 30 are all inserted into the slot 23 of the stator. That is, only the stator coil 40 is shown.

As shown, in order to form the stator coil 40, not only the general hairpin conductor 30 but also special hairpin conductors 41 to 47 may be provided. The special hairpin conductors may have the same insertion pattern as the general hairpin conductors 30. However, the shapes of the bent portions may be different from each other. In addition, the shape of the bent portion may be different between the special hairpin conductors 41 to 47.

Here, the special hairpin conductors 45, 46, 47 may be for connecting to the three-phase power source, respectively. That is, it may be a hairpin conductor for forming a leader line. Special hairpin conductor 44 may be a hairpin conductor for neutral point formation. In addition, the special hairpin conductors 42, 43 and 44 may be hairpin conductors for connecting the sub coils in each phase in series. That is, the special hairpin conductors 42, 43, 44 may be hairpin conductors for phase connection.

Due to the difference in the shape of the bent portion between the special hairpin conductor and the general hairpin conductor, after the stator coil 40 is formed, a connection such as necessary power connection and neutral point formation may be made without confusion.

On the other hand, the stator coil 40 shown in FIG. 3 is still incomplete because the ends of the hairpin conductors are not connected to each other.

First, all of the stator coils 40 shown in FIG. 3 must be inserted into the stator core 20 shown in FIG. 1 for connection. 4, the bent portions of the hairpin conductor located on the top surface of the stator core 20 and the ends of the hairpin conductor located on the bottom surface of the stator core 20 may be twisted in the circumferential direction. . Of course, only the ends of the hairpin conductor can be twisted in the circumferential direction. Through this twist, the overall height of the stator 20 is reduced and the ends of the hairpin conductors to be connected to each other are adjacent to each other in the radial direction. That is, the ends of the hairpin conductors for wiring can be aligned.

FIG. 5 illustrates a state in which the stator 10 of FIG. 4 is turned upside down. As shown, the twist direction for the ends of the hairpin conductor located on the bottom surface of the stator core 20 may vary from slot layer to layer.

For example, the ends of the hairpin conductor provided in the slot 1 layer may be twisted clockwise, the slot 2 layer is counterclockwise, the slot 3 layer is clockwise, and the slot 4 layer is counterclockwise. The ends of the twisted hairpin conductor form a plurality of layers in the radial direction similar to the layers of the slots. That is, if the slot has four layers, the ends of the hairpin conductors are four layers in the radial direction. And, such a pattern may be formed in the same circumferential direction as the number of slots.

Thus, the bent portions of the plurality of hairpin conductors 30 are located in the axial upper portion of the stator core 20. That is, the bent portions are positioned on the top surface of the stator core 20. In addition, both ends 33, 34, 37, and 38 of the plurality of hairpin conductors 30 are located in the axial lower portion of the stator core 20. That is, the ends are located on the bottom surface of the stator core 20. The ends may include the ends of the general hairpin conductor as well as the ends of the special hairpin conductor described above.

6 is a view in which the junction 50 is formed by electrically connecting the ends of the hairpin conductor to each other by welding. For example, the ends of the first and second radial layers may be welded, and the ends of the three and four radial layers may be welded to form a joint.

As shown in FIG. 6, the junction part 50 may be formed constantly along the circumferential direction. That is, the same pattern may be formed to be repeated regularly. This is because special points for forming the stator coils of the three phases are formed at the bent portions instead of the junction part 50.

The special point may include a power connection point for power connection or power draw. The special point may include a special point for forming a neutral point, and may include a phase connection point for phase connection.

When the welding is completed, an insulation film is formed to insulate the ends of the hairpin conductors. For example, such an insulating film may be formed through powder coating.

Meanwhile, external power may be applied or power may be drawn through the bent portions positioned on the top surface of the stator core 20. In addition, neutral point formation or phase connection is also performed through the bent portions. This means that the wiring pattern for the three-phase stator coil is performed on the top surface of the stator core 20. That is, special points are formed through the bent portions.

Therefore, various types of special hairpin conductors 41 to 47 as well as the general hairpin conductor 30 are required to form a stator coil. That is, special hairpin conductors with different shapes of the bent portions are required. Due to such a difference in shape, there is a problem in that there are many kinds of hairpin conductors to be manufactured and managed. In addition, although not shown, a special hairpin conductor may be needed, such as a jump hairpin conductor for connecting between the radial two and three layers of the slot.

Due to these various types of hairpin conductors, the geometrical differences of the respective hairpin conductors are bound to occur. In particular, there is a problem in that the bend-shaped unity is poor, and it is difficult to maintain the distance between the respective hairpin conductors.

As shown in FIG. 4, the general hairpin conductor may be kept at a uniform distance from other general hairpin conductors. That is, a uniform distance may be formed between the bent portion and the adjacent bent portion. However, since the shape of the bent portion of the special hairpin conductor is very diverse, it is very difficult to form a certain distance between the special hairpin conductors or between the special hairpin conductor and the general hairpin conductor.

On the other hand, the insertion of the hairpin conductor in the slot using an insertion device (not shown), there is a problem that the production of the insertion device is difficult and requires various guides and jigs (jig).

Specifically, the ends of the hairpin conductor are temporarily inserted into a specific slot, and the insertion of the hairpin conductor is terminated by pressing the bent portion in a state where the bent portion of the hairpin conductor is fixed through the guide and the jig. Therefore, in order to secure a certain distance between the bent portions, various types of guides and jigs are required in consideration of the shape of the bent portions. Likewise, in the process of twisting the ends of the hairpin conductor, the bent portion of the hairpin conductor must be fixed.

In such processes, interference between the special hairpin conductor and the general hairpin conductor may occur, thereby causing a problem of damage to the coating.

The present invention basically aims to solve the above-mentioned problem.

Through the embodiments of the present invention, it is intended to provide an electric rotating device that is easy to manufacture by significantly reducing or omitting the type and number of special hairpin conductors.

Through the embodiment of the present invention, the hairpin conductor insertion or bit to simplify the guide and jig structure required for the process, to provide an electric rotating device that is easy to manufacture and can simply implement the manufacturing apparatus.

Through the embodiment of the present invention, to minimize the interference between the hairpin conductors in the insertion process of the hairpin conductor, to provide an electric rotating device that can minimize the damage to the coating.

According to an embodiment of the present invention, it is intended to provide an electric rotating device that is easy to manufacture by forming a pattern for forming a three-phase stator coil at the portion where the ends of the hairpin conductor, that is, the axially lower side of the stator core.

Through the embodiment of the present invention, by using a hairpin conductor having the same shape of the bent portion, it is intended to provide an electric rotating device that is easy to secure the insulation distance between the hairpin conductors.

In order to achieve the above object, according to an embodiment of the present invention, a plurality of slots are formed along the circumferential direction; A plurality of hairpin conductors having a bent portion located in an axial upper portion of the stator core and having both ends inserted into different slots along the axial direction of the stator; A junction positioned axially below the stator core and electrically connecting the hairpin conductor ends to form a three-phase stator coil; And an electrical rotating device positioned below the stator core in an axial direction and electrically connected to at least some of the hairpin conductor ends to form a neutral point and a power connection point.

The slot may have four or more even layers along the radial direction.

The hairpin conductor may include a general hairpin conductor and a special hairpin conductor for forming a neutral point and a leader line.

The junction may be formed between the ends of the general hairpin conductor, and the connection part may be formed for electrical connection of the ends of the special hairpin conductor. The joint part may be formed by welding, and the connection part may be formed by soldering.

Each phase of the three phases may each comprise sub coils, and the special hairpin conductor may comprise a hairpin conductor for connecting the subcoils in series.

Each phase of the three phases may be formed in parallel.

Preferably, the bent portions of the hairpin conductors are the same. Therefore, since uniformity is imparted to the shape of the bent portion, the shape and type of guide and jig for performing the insertion and bit process can be simply implemented.

It is preferable that the length of the end of the special hairpin conductor is longer than the length of the end of the general hairpin conductor. Thus, the position of the junction through the ends of the normal hairpin conductor and the connection through the end of the hairpin conductor end are different.

That is, the connection portion may be located below the junction in the vertical direction. This may be assumed that the bent portion is located on top of the stator core. Therefore, it can be said that both the junction part and the connection part are located under the stator core. In other words, it can be said that all the joining or connection for forming the three-phase stator coil is performed at the bottom of the stator core.

The connection part may include a circuit board on which the end of the special hairpin conductor is inserted on the junction part. In addition, a pattern for forming a neutral point and a pattern for forming a power connection point may be formed on the circuit board. In addition, a phase connection pattern for connecting the sub coils in series may be formed on the circuit board.

Specifically, a plurality of lands into which the ends of the special hairpin conductor may be formed may be formed in the circuit board. A pattern is formed between the lands and the lands to electrically connect the lands to the lands. Thus, when the ends of the special hairpin conductor are respectively inserted into the land, the patterns can form a neutral point, a power connection point and a phase connection point.

The connection unit may include a power connection line connected to the power connection point for power connection or power draw.

The connection part may include a fixing part provided on the circuit board to fix the power connection line.

One end of the power connection line is connected to the power connection point, and the other end forms a power terminal. Therefore, the power supply terminal as well as the power connection line may be fixed through the fixing unit.

Accordingly, the connection part is preferably formed such that the circuit board, the fixing part, the power connection line, and the power terminal form one assembly.

In order to achieve the above object, according to an embodiment of the present invention, a plurality of slots are formed along the circumferential direction; A plurality of hairpin conductors having a bent portion located in an axial upper portion of the stator core and having both ends inserted into different slots along the axial direction of the stator and positioned in an axial lower portion of the stator core; A junction located at an axial bottom of the stator core and electrically connecting the hairpin conductor ends; And a connection portion located in the axially lower portion of the stator core and electrically connected to at least some of the ends of the hairpin conductors to form a neutral point and a power connection point, wherein all electrical connections or connections for forming a three-phase stator coil are made. An electric rotating device can be provided, characterized in that it is carried out in the axial lower part of the stator core.

The electric rotating device may be a motor.

The hairpin conductor may include a general hairpin conductor and a special hairpin conductor for forming a neutral point, a power connection point and a phase connection point connecting the sub coils of each phase in series.

It is preferable that the length of the end of the special hairpin conductor is longer than the length of the end of the general hairpin conductor.

The connection part may include a circuit board to which the ends of the special hairpin conductor are inserted and electrically connected.

Patterns for forming the neutral point, the power connection point and the phase connection point may be formed on the circuit board. Therefore, as the special hairpin conductor end is connected to the circuit board, a neutral point and a power connection point may be formed. And the phase connection points can likewise be electrically connected to one another.

The connection unit may include a power connection line connected to the power connection point for power connection or power draw. The connection part may include a fixing part provided on the circuit board to fix the power connection line.

Preferably, the bent portions of the hairpin conductors are the same. That is, it is preferable that the shape of the bent portion of the general hairpin conductor and the shape of the bent portion of the special hairpin conductor are the same.

Through the embodiments of the present invention, it is possible to provide an electric rotating device that is easy to manufacture by significantly reducing or omitting the type and number of special hairpin conductors.

Through the embodiment of the present invention, the hairpin conductor insertion or bit can simplify the guide and jig structure required for the process, thereby providing an electric rotating device that is easy to manufacture and can simply implement the manufacturing apparatus.

Through the embodiment of the present invention, it is possible to provide an electric rotating device that can minimize the damage to the coating by minimizing the interference between the hairpin conductors in the insertion process of the hairpin conductors.

According to an embodiment of the present invention, it is possible to provide an electric rotating device that is easy to manufacture by forming a pattern for forming a three-phase stator coil at the portion where the ends of the hairpin conductor are located, that is, in the axially lower side of the stator core. .

Through the embodiment of the present invention, by using a hairpin conductor having the same shape of the bent portions, it is possible to provide an electric rotating device that is easy to secure the insulation distance between the hairpin conductors.

1 is a perspective view of a stator core that can be applied to a conventional or embodiment of the present invention;
2 is a perspective view of a hairpin conductor that can be applied to a conventional or embodiment of the present invention;
3 is a perspective view showing only hairpin conductors after all of the hairpin conductors that can be applied to the conventional or embodiment of the present invention have been inserted into the stator core;
4 is a perspective view showing the hairpin conductors twisted in the circumferential direction after all of the hairpin conductors that can be applied to the conventional or embodiment of the present invention are inserted into the stator core;
FIG. 5 is a perspective view showing an inverted state of FIG. 4; FIG.
FIG. 6 is a perspective view illustrating a state in which hairpin conductors are connected through welding as in the related art in FIG. 5;
7 is a connection diagram of a three-phase stator coil that can be applied to an embodiment of the present invention;
Figure 8 is a perspective view of the connection portion separated from the junction can be applied to an embodiment of the present invention; And
FIG. 9 is a plan view briefly illustrating a circuit board of a connection unit illustrated in FIG. 8.

Hereinafter, with reference to the accompanying drawings, it will be described in detail embodiments of the present invention. As described above, the stator having the hairpin conductor described with reference to FIGS. 1 to 5 may be applied in the same or similar manner in this embodiment, unless it is contradictory or exclusive to the present embodiments.

However, in the present embodiment, the method or structure of the hairpin conductor ends or the configurations therefor may be different from the conventional stator.

First, referring to FIG. 7, a three-phase stator coil connection diagram that can be applied to this embodiment will be described.

Sub coils may be connected in series for powering up or drawing out on u. That is, a plurality of sub coils from u1a to u1d may be connected in series. To this end, the phase connection points u1b and u1c may be connected to each other. The u1a may be referred to as a power connection point for applying or drawing power on u, and u1d forms a neutral point (N).

On the other hand, powering up or drawing out u phase may be performed in parallel. That is, coils from u2a to u2d may be formed in parallel with the coils connected from u1a to u1d. Therefore, power supply or withdrawal on u is performed through the power connection points u1a and u2a, and the neutral point may be formed by u1d and u2d. Of course, phase connection points u2b and u2c may also be formed.

Like the coils on u, coils on v and w may also be formed. And, the pattern of these coils may be formed symmetrically along the circumferential direction of the stator core.

Therefore, according to the present embodiment, the neutral point N may be formed by connecting coil ends u1d, u2d, v1d, v2d, w1d, and w2d of each phase to each other. That is, six ends may be connected to each other to form a neutral point (N).

In addition, according to the present embodiment, six terminals may be connected to the power connection line, respectively, so that power application or withdrawal may be performed.

However, this three-phase coil formation may be variously modified. Basically, three ends may be connected to the power supply line, respectively, and the three ends may form a neutral point (N).

The ends shown in FIG. 7, that is, 24 ends, may be referred to as special points. That is, it is a special point for power connection, neutral connection and phase connection. In order to form a three-phase stator coil using a hairpin conductor, not only a connection to a special point but also a connection to a general point is required.

For example, a plurality of common points may be connected to each other in a sub coil from u1a to u1b. Wiring between these plurality of common points can be performed at the junction. In other words, the hairpin conductor ends may be electrically connected to form a junction. That is, it can be said that the ends of the general hairpin conductor are electrically connected to each other to form a junction.

On the other hand, according to the present embodiment, it may be made to include a connection portion provided separately from the junction. Specifically, the junction part electrically connecting the ends of the general hairpin conductor and the connection part forming a special point through the ends of the special hairpin conductor may be provided separately.

Hereinafter, the junction part and the connection part will be described in detail with reference to FIG. 8.

As shown in FIG. 8, hairpin conductor ends are located at the axial bottom of the stator core 20. These hairpin conductor ends are electrically connected to form a junction 50.

However, in this embodiment, not all hairpin conductor ends form the junction 50. In other words, a connection 60 may be formed that is electrically connected to at least some of the hairpin conductor ends.

The connection unit 60 may be provided to form a neutral point (N) and a power connection point. That is, it may be provided to form a special point. In addition, the connection unit 60 may be provided to form a phase connection point.

The special hairpin conductor may comprise a special hairpin conductor to form a power connection point. The special hairpin conductor may comprise a special hairpin conductor to form a neutral point. In addition, the special hairpin conductor may comprise a special hairpin conductor for connecting the sub coils in series. That is, it may include a special hairpin conductor for forming a phase connection point.

Here, the hairpin conductors forming the general point and the special point may be different. Specifically, the shapes of the bent portions may all be the same. However, it is preferable that the terminal length of the special hairpin conductor forming the special point is longer than the terminal length of the general hairpin conductor forming the general point.

Due to the length difference between the ends of the special hairpin conductor and the general hairpin conductor, the locations where the junction 50 and the connection 60 are formed may be different from each other. However, both the junction part 50 and the connection part 60 may be located above or below both of the stator cores 20. In other words, it is preferable that both the junction part 50 and the connection part 60 are formed at the position where the end of the hairpin conductor is provided, not the position at which the bent portion of the hairpin conductor is provided. Through this, the process of inverting the stator core several times to produce the stator can be omitted, which is very effective.

Specifically, as shown in FIG. 8, the connection unit 60 may be formed above the junction unit 50. Both the junction part 50 and the connection part 60 may be located at the axially lower side of the stator core. Therefore, the connection part 60 is further lowered in the axial direction of the stator core than the junction part 50. Will be located.

The connection part 60 may include a circuit board 61 into which the end of the special hairpin conductor is inserted. The circuit board 61 may be located on the junction 50 as shown in FIG. 8. In other words, the junction part 50 may be formed between the connection parts 60 of the stator core.

The connection unit 60 connects the power connection lines 62a, 62b, 63a, 63b, 64a and 64b to be connected to the power connection points u1a, u2a, v1a, v2a, w1a and w2a for power connection or withdrawal of power. It can be made, including. One end of each of the power connection lines is connected to the power connection point, and the other end forms terminals 62c, 63c, and 64c for power connection or power drawing.

The power connection lines 62a, 62b, 63a, 63b, 64a, and 64b are connected to the circuit board 61 and drawn out. Therefore, the power connection line is preferably spaced apart from the circuit board 61. In addition, since the power connection and the power drawing are performed at a specific position, the power connection line is preferably insulated from the circuit board 61 and fixed to the circuit board 61. To this end, the connection part 60 preferably includes a fixing part (65).

Preferably, the fixing unit 65 is formed in plural, and is preferably provided on the circuit board 61. In addition, the fixing part 65 is preferably formed integrally with the circuit board 61.

The fixing part 65 is an insulating fixing part 65b for simultaneously insulating and fixing the connection fixing part 65a and the power connecting line with the circuit board 61 to fix the power connection point and the power connection line at the same time. It may be made, including.

The fixing unit 65 may be formed in plurality in correspondence with the power connection line of each phase. Therefore, a plurality of connection fixing parts 65a and insulating fixing parts 65b may be formed corresponding to the power connection lines of the respective phases.

On the other hand, the ends of the special hairpin conductor is inserted into the circuit board 61 is electrically connected. Specifically, adjacent ends may be electrically connected to each other, and spaced ends may be electrically connected to each other. Of course, a particular end may be electrically connected to the power connection line.

Therefore, patterns may be formed in the circuit board 61 in which special hairpin conductor ends are electrically connected to each other.

Hereinafter, the circuit board 61 will be described in detail with reference to FIG. 9. For convenience of description, the connection part in which the power connection lines are omitted may be illustrated.

9 illustrates an embodiment in which power of three phases is applied or drawn in parallel. Alternatively, it may be possible to be modified in the form of one power connection line for each of the three-phase power source.

A plurality of lands 76 may be formed on the circuit board 61. The land 76 may be formed in the form of a through hole in the circuit board 61, and the end of the special hairpin conductor may be inserted into the land 76.

A pattern is formed around the land 76, and the specific land and the specific land may be electrically connected to each other through the pattern.

First, the circuit board 61 may be formed with a plurality of lands 76 into which ends of special hairpin conductors for forming power connection points are inserted. For example, lands 76 may be formed in which power connection points u1a, u2a, v1a, v2a, w1a, w2a may be formed, respectively.

A pattern 71 may be formed around the power connection point for power connection or power draw. For example, the pattern 71a may be formed to correspond to the power connection point 71a, and the other pattern 71b may be formed to correspond to the other power connection point 71b. The patterns 71a and 71b may be connected to the power connection lines 62a and 62b of u described above, respectively. Specifically, each of the connection fixing parts 65a formed integrally with the patterns 71a and 71b may be connected to and fixed to each of the power connection lines 62 and 62b.

The connection between the connection fixing part 65a and the power connection line may be performed by welding or soldering.

The circuit board 61 may be formed with a plurality of lands 76 into which the ends of the special hairpin conductors for forming the neutral point are inserted. For example, a plurality of lands 76 may be formed in which ends u1d, u2d, v1d, v2d, w1d and w2d may be inserted, respectively.

A pattern 75 for forming a neutral point may be formed around the lands for forming the neutral point. The pattern 75 for forming the neutral point may be formed to electrically connect the ends for forming each neutral point with each other.

Therefore, when the terminals u1d, u2d, v1d, v2d, w1d, and w2d are respectively inserted into the corresponding lands 76, they are electrically connected to each other through the neutral point pattern 75. Through this, the neutral point can be easily formed.

A plurality of lands 76 may be formed in the circuit board 61 for phase connection. That is, lands 76 may be formed to electrically connect the sub coils forming each phase to each other.

For example, a land 76 into which the terminal u1b and the terminal u1c are inserted may be formed, and a pattern 74, ie, a phase connection pattern 74, may be formed to electrically connect them. In addition, due to the parallel power source, a land 76 into which the terminal u2b and the terminal u2c are inserted and a phase connection pattern 74 connecting the terminal u2b and the terminal u2c may be formed. A plurality of lands 76 and phase connection patterns 74 for phase connection may be formed corresponding to each phase.

The ends (v1b, v1c, v2b, v2c, w1b, w1c, w2b, w2c) shown in FIG. 9 can all be inserted into each land 76 for this phase connection. And, the phase connection may be implemented through the phase connection pattern 74.

As described above, the ends of the special hairpin conductor forming the special point may be inserted into the land 76 provided on the circuit board 61. That is, the lengths of these ends can be made longer than the ends of the normal hairpin conductors and inserted into the lands 76. Insertion of these ends can be performed in the form of interference fit. Thus, the ends can be inserted into each land 76 and electrically connected through a plurality of patterns 71, 74, 75 at the same time.

However, the ends are preferably soldered after being inserted into the land 76. That is, it is preferable that the wiring and fixing are performed by soldering the pattern around the land 76. Through this, the circuit board 61 may be firmly fixed to the stator coil or the stator core.

On the other hand, the ends of the general hairpin conductor forming the common point can be joined by welding as shown in FIG. That is, the joint 50 may be formed by welding.

According to the above embodiment, the bonding or the connection for forming the three-phase stator coil may be performed at the ends of the hairpin conductor. Therefore, it becomes possible to omit the process of overturning the stator core 20 several times for joining and connection.

It is also possible to unify the shape of the bent portion of the hairpin conductor. This is because special point formation is not performed through the bent portion. Therefore, there is no need for an operator to recognize the difference in shape of the bent portion during stator manufacture.

Of course, due to the unification of the shape of the bent portion, it is easy to ensure the insulation distance between the hairpin conductors, it is possible to simplify the manufacturing apparatus and the like.

10: stator 20: stator core
30: (typical) hairpin conductor 40: stator coil
50: junction 60: connection
61: circuit board 62, 63, 64: power connection line on u, v, w
71, 74, 75: Pattern 76: Land

Claims

A stator core having a plurality of slots formed in a circumferential direction;
A plurality of hairpin conductors having a bent portion located in an axial upper portion of the stator core and having both ends inserted into different slots along the axial direction of the stator;
A joint located at an axial lower side of the stator core and electrically connecting ends of the hairpin conductor to form a three-phase stator coil;
And a connection part disposed below the stator core in an axial direction and electrically connected to at least some of the ends of the hairpin conductor to form a neutral point and a power connection point.
The slot is characterized in that it has at least four even layers along the radial direction,
The hairpin conductor is characterized in that it comprises a general hairpin conductor and a special hairpin conductor for forming the neutral point and the leader line,
And the connection part comprises a circuit board on which the end of the special hairpin conductor is inserted on the junction part.

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The method of claim 1,
The joint is formed between the ends of the general hairpin conductor, and the connection part is formed for electrical connection of the ends of the special hairpin conductor.

The method of claim 4, wherein
Wherein each phase of said three phases each comprises sub coils, said special hairpin conductor comprising a hairpin conductor for connecting said subcoils in series.

The method of claim 4, wherein
Each phase of the three phases is formed in parallel.

The method according to any one of claims 1 and 4 and 5 and 6,
The shape of the bent portion of the hairpin conductors are all the same electrical rotating device.

The method according to any one of claims 1 and 4 and 5 and 6,
And the length of the end of the special hairpin conductor is longer than the length of the end of the general hairpin conductor.

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The method of claim 8,
And a pattern for forming a neutral point and a pattern for forming a power connection point are formed on the circuit board.

The method of claim 10,
And a phase connection pattern for connecting the sub coils in series to the circuit board.

The method of claim 10,
The connection unit, the electric rotary device characterized in that it comprises a power connection line connected to the power connection point for power connection or withdrawal of power.

The method of claim 12,
The connection part, the electric rotating device characterized in that it comprises a fixing portion provided on the circuit board for fixing the power connection line.

A stator core having a plurality of slots formed in a circumferential direction;
A plurality of hairpin conductors having a bent portion located in an axial upper portion of the stator core and having both ends inserted into different slots along the axial direction of the stator and positioned in an axial lower portion of the stator core;
A joint located at an axial lower side of the stator core and electrically connecting the ends of the hairpin conductor;
A connection portion located below the stator core in an axial direction and electrically connected to at least some of the ends of the hairpin conductor to form a neutral point and a power connection point; Including,
The hairpin conductor is a general hairpin conductor; A special hairpin conductor for forming a neutral point, a power connection point and a phase connection point connecting the sub coils of each phase in series;
The connection part includes a circuit board to which the ends of the special hairpin conductor are inserted and electrically connected.
And wherein all electrical bonding or wiring for forming the stator coils in three phases is carried out at the axial bottom of the stator core.

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The method of claim 14,
And the length of the end of the special hairpin conductor is longer than the length of the end of the general hairpin conductor.

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The method of claim 14,
And the patterns for forming the neutral point, the power connection point and the phase connection point are formed on the circuit board.

The method of claim 18,
The connection unit, the electric rotary device characterized in that it comprises a power connection line connected to the power connection point for power connection or withdrawal of power.

The method of claim 19,
The connection part, the electric rotating device characterized in that it comprises a fixing portion provided on the circuit board for fixing the power connection line.

The method according to any one of claims 14 and 16 and 18 and 19 and 20,
The shape of the bent portion of the hairpin conductors are all the same electrical rotating device.