JP2023156183A - Stator, rotary electric machine, blower, and stator manufacturing method - Google Patents

Abstract

To obtain a stator capable of shortening the axial length of a rotary electric machine.SOLUTION: A stator has a stator core having a back yoke part and a plurality of teeth parts that protrude radially inward from the back yoke part at intervals in the circumferential direction, an insulating bobbin 62 covering each teeth part, a metal connecting pin 81 fixed to one end of the bobbin 62, and a coil having a binding part 82 in which a terminal wire 64 is wound around the connecting pin 81 a plurality of times, and is wound around the teeth part via the bobbin 62. One end of the binding part 82 and one end of the bobbin 62 are in contact with each other, and adjacent binding part 82 wound around the connecting pin 81 are in contact with each other.SELECTED DRAWING: Figure 8

Description

The present disclosure relates to a stator, a rotating electric machine, a blower, and a method for manufacturing a stator.

In a stator of a rotating electric machine, a coil is wound around each tooth portion of a stator core via an insulating bobbin that covers the stator core. The terminal wire of each coil is wound around a metal connecting pin mounted on an insulating bobbin, and the connecting pins are connected to each other using a wiring board. As a method for joining a connecting pin on an insulating bobbin and a terminal wire of a coil wound around the connecting pin, a joining method using soldering is known.

Patent Document 1 uses a DIP soldering method in which a plurality of connecting pins and the terminal wire of each coil are immersed in a solder bath to simultaneously join the tied portions.

International Publication No. 2018/123446

However, in the DIP soldering method of Patent Document 1, when fixing the terminal wire of the coil to the connection pin on the insulating bobbin, in order to prevent the insulating bobbin from melting due to the heat of the solder bath, the tied part is It is necessary to space it at least a certain distance from the top of the insulating bobbin. For this reason, there is a problem in that the axial length of the rotating electric machine increases by the space between the insulating bobbin and the binding portion.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a stator that can shorten the axial length of a rotating electric machine.

In order to solve the above problems and achieve the objects, the stator of the present disclosure includes a back yoke portion and a plurality of teeth portions that protrude radially inward from the back yoke portion at intervals in the circumferential direction. A stator core having a stator core, an insulating bobbin that covers each tooth portion, a metal connection pin fixed to one end of the bobbin, and a binding portion in which the terminal wire is wound around the connection pin multiple times, A coil is wound around the teeth via a bobbin. One end of the binding portion and one end of the bobbin are in contact with each other, and adjacent binding portions wound around the connecting pin are in contact with each other.

According to the stator of the present disclosure, it is possible to shorten the axial length of the rotating electric machine.

Schematic diagram showing the configuration of a blower having a stator according to an embodiment A partial cross-sectional view showing the configuration of a blower having a stator according to an embodiment. Schematic cross-sectional view showing a partial configuration of a stator as a comparative example Schematic cross-sectional view showing a partial configuration of a stator as a comparative example A schematic sectional view showing a partial configuration of a stator according to an embodiment A schematic diagram showing a partial configuration of a stator according to an embodiment A schematic diagram illustrating the configuration of a binding portion of a stator according to an embodiment. A schematic diagram illustrating a process of reducing the winding pitch of the stator binding portion according to the embodiment. A schematic diagram illustrating a process of joining the tied portions of the stator according to the embodiment. Schematic diagram showing pressure marks after joining of the stator binding portion according to the embodiment A top view showing the state of connection pins and terminal wires during a joining process in a stator according to an embodiment. A schematic cross-sectional view showing a state in which a wiring board is fixed in a stator according to an embodiment. A schematic cross-sectional view showing a state in which a moisture-proofing agent is filled in a binding part of a stator according to an embodiment. A schematic cross-sectional view showing a connection process of a connection plate of a stator according to an embodiment.

Below, a stator, a rotating electric machine, a blower, and a method for manufacturing a stator according to embodiments will be described in detail based on the drawings.

Embodiment.
FIG. 1 is a schematic diagram showing the configuration of a blower having a stator according to an embodiment. FIG. 2 is a partial cross-sectional view showing the configuration of a blower having a stator according to an embodiment. As shown in FIG. 1, the blower includes an induction motor 101 that is a rotating electric machine, a shaft 32 of the induction motor 101, and a propeller fan 100 attached to the tip of the shaft 32. As shown in FIG. 2, the induction motor 101 includes a stator 60 and a rotor 30, and the rotor 30 is a squirrel cage rotor. The rotor 30 rotates with the outer circumferential surface of the rotor 30 facing the inner circumferential surface of the stator 60. The rotor 30 includes a rotor core 31 and a shaft 32.

The shaft 32 is press-fitted into the rotor 30. The shaft 32 is supported by a pair of bearings 5a and 5b on both sides of the rotor core 31 in the axial direction. The rotor 30 rotates around the axis C of the shaft 32 via bearings 5a and 5b. The axial center C is also the axial center of the rotor core 31.

The stator 60 includes a stator core 61, an insulating bobbin 62, and a coil 63. The stator core 61 includes a plurality of teeth portions 61a and a back yoke portion 61b. The plurality of teeth portions 61a protrude radially inward from the back yoke portion 61b at intervals in the circumferential direction. The bobbin 62 is made of an insulating material and is attached around each tooth portion 61a. The coil 63 is wound around each tooth portion 61a via the bobbin 62, and is housed in a slot formed between adjacent teeth portions 61a. That is, a bobbin 62 is attached to the teeth portion 61a, and a magnet wire is wound around the bobbin 62 to form a coil 63. After forming the coil 63, the plurality of teeth portions 61a on which the coil 63 is formed are press-fitted into the back yoke portion 61b to form the stator core 61.

The wiring board 800 electrically connects each coil 63 wound around each tooth portion 61a via a bobbin 62. The terminal wire 64 (see FIG. 5) of each coil 63 is connected to a metal connection pin 81 provided on the end 62a of the bobbin 62 on the connection plate 800 side, and connected to the connection plate 800 via the connection pin 81. . A capacitor 51 is provided at the bottom of the wiring board 800.

Next, a stator 20 of a comparative example will be described using FIGS. 3 and 4. FIG. 3 is a schematic cross-sectional view showing a partial configuration of a stator 20 as a comparative example. FIG. 4 is a schematic cross-sectional view showing a partial configuration of a stator 20 as a comparative example. The stator 20 of the comparative example shown in FIGS. 3 and 4 includes a stator core 21, a bobbin 22, a coil 23 having a terminal wire 24, and a connecting pin 41. The connection pin 41 is press-fitted into an insertion hole 25 formed at the end of the bobbin 22. As shown in FIG. 3, in order to connect the terminal wire 24 to the connecting pin 41, the terminal wire 24 is wound (twisted) an arbitrary number of times at an arbitrary location in the axial direction of the connecting pin 41. has.

Generally, when electrically connecting the terminal wire 24 and the connecting pin 41, the binding portion 42 is soldered. When the number of tied parts 42 is large, in order to improve workability, solder is melted in a tank, the tied parts 42 are impregnated in a tank containing solder, and soldered by DIP, instead of soldering with small hands. Soldering method is used.

In the DIP soldering method, the solder stored in the tank is constantly heated to prevent it from solidifying, and the surface of the molten solder becomes extremely hot. Therefore, when impregnating the tied portion 42, it is necessary to form the tied portion 42 at a position away from the bobbin 22. There is a problem in that the upper end surface of the resin material bobbin 22 and the insertion hole 25 are melted by the heat of the surface of the melted solder, and the connection pin 41 is tilted, so a measure must be taken to shorten the impregnation time of the tied portion 42. However, as the wire diameter of the terminal wire 24 becomes thicker, the wettability of the solder deteriorates, so depending on the wire diameter, it is necessary to lengthen the impregnation time, and countermeasures against the above-mentioned effects of heat are required.

Furthermore, in recent years, the material of the magnet wire used for the coil 23 is increasingly being replaced from a copper material to an aluminum-based material. Magnet wires made of copper, which have low electrical resistivity and are highly available, are generally used in electric motors. On the other hand, aluminum-based materials have a specific gravity of about 1/3 that of copper materials, making it possible to reduce the weight of the induction motor 101 and the blower using the induction motor 101, and with less significant price fluctuations than copper materials. This leads to cost control.

Furthermore, when performing soldering, if the terminal wire 24 is made of an aluminum-based material, an oxide film will be formed on the surface of the terminal wire 24, so it is necessary to use a special solder and a soldering accelerator (flux).

When the terminal wire 24 and the connecting pin 41 are made of different metals, when the different metals come into contact in an electrolytic solution such as water, a potential difference occurs between the metals, and the metal at a lower potential erodes the metal at a higher potential (corrosion). ) a phenomenon occurs. The greater the potential difference between the metals in contact, the greater the degree of corrosion. The potential of aluminum is higher than that of steel, copper, etc., so there is a risk that the terminal wire 24 will corrode and break in the electrolytic aqueous solution. As a countermeasure for the above, as shown in FIG. 4, the tied part 42 joined to the connecting pin 41 is completely covered with a moisture-proofing agent 43 so that no potential difference occurs between the connecting pin 41, the terminal wire 24, and the tied part 42. It is necessary to

FIG. 5 is a schematic cross-sectional view showing a partial configuration of the stator 60 according to the embodiment. As shown in FIG. 5, a terminal wire 64 of a coil 63 wound around a bobbin 62 is connected to a connecting pin 81. An insertion hole 65 extending in the direction of the axis C is formed in an end 62a of the bobbin 62 on the connection plate 800 side. The connecting pin 81 is press-fitted into the insertion hole 65.

There are two types of terminal wires 64: a starting terminal wire at the beginning of winding of the coil 63 and a terminal terminal wire at the end of winding, and each terminal wire is connected to a different connection pin 81. As shown in FIG. 5, the terminal wire 64 has a tied portion 82 that is wound (twisted) a plurality of times so as to be in contact with the upper end portion, which is one end side of the bobbin 62. That is, one end of the connecting pin 81 of the bobbin 62 in the axial direction and one end of the binding portion 82 are in contact with each other.

In the embodiment, the coil 63 and the terminal wire 64 are aluminum magnet wires, and the connection pin 81 is a prismatic steel wire plated. Note that the connecting pin 81 may be a cylinder, and the material of the connecting pin 81, presence or absence of plating, the material of the plating, and the thickness of the plating may be arbitrarily determined.

Furthermore, in order to solve the problems of the above-mentioned comparative example, in the embodiment, solid-phase bonding using ultrasonic waves is used to electrically connect the binding portion 82 and the connecting pin 81. Solid phase bonding can suppress the influence of heat on the bobbin 62 and is suitable for bonding dissimilar metals. Here, solid-phase bonding is a general term for a method of joining objects in a solid state without melting them, and uses the bonding force between atoms at the bonding interface by heating and pressurizing to bond objects together. It is to join. Ultrasonic solid-phase bonding uses pressure and ultrasonic vibration, and is suitable for joining dissimilar metals because it can join objects at low temperatures and suppresses the formation of fragile intermetallic compound layers.

In addition, the above-described DIP soldering method requires constant heating of the solder, resulting in a large environmental load (power consumption). On the other hand, solid-phase bonding using ultrasonic waves, which uses a large amount of power only during bonding, can reduce the environmental burden during manufacturing. Furthermore, since solder and a DIP solder tank are not used, the amount of solder used in the product can be reduced, and the cleaning work (maintenance) of the DIP solder tank can be reduced, leading to a reduction in the burden on production workers.

FIG. 6 is a schematic diagram showing a partial configuration of the stator 60 according to the embodiment. FIG. 6 shows a part of the stator 60 when viewed in the outer diameter direction from the inner diameter side axis C. One bobbin 62 is attached to each of the plurality of teeth portions 61a of the stator core 61, and each bobbin 62 is provided with two insertion holes 65 into which the connection pins 81 are inserted. In FIG. 6, the insertion hole 65 is not shown for convenience. The connection pin 81 may or may not be inserted into each insertion hole 65. For example, there are some bobbins 62 in which two connecting pins 81 are inserted, some bobbins 62 in which one connecting pin 81 is inserted in one side, and some bobbins 62 in which no connecting pin 81 is inserted.

Next, a method for manufacturing the stator 60 will be described using FIGS. 7 to 14. FIG. 7 is a schematic diagram showing the configuration of the binding portion 82 of the stator 60 according to the embodiment. Similar to FIG. 6, FIG. 7 shows the stator 60 when viewed from the axis C on the inner diameter side in the outer diameter direction. FIG. 8 is a schematic diagram showing a process of reducing the winding pitch of the binding portion 82 of the stator 60 according to the embodiment. FIG. 9 is a schematic diagram showing a process of joining the binding portion 82 of the stator 60 according to the embodiment. FIG. 10 is a schematic diagram showing pressure marks after joining of the tied portion 82 of the stator 60 according to the embodiment. FIG. 11 is a top view showing the state of the connection pin 81 and the terminal wire 64 during the joining process in the stator 60 according to the embodiment. FIG. 12 is a schematic cross-sectional view showing a state in which connection plate 800 is fixed in stator 60 according to the embodiment. FIG. 13 is a schematic cross-sectional view showing a state in which the binding portion 82 of the stator 60 according to the embodiment is filled with a moisture proofing agent. FIG. 14 is a schematic cross-sectional view showing a process of connecting the wiring plate 800 of the stator 60 according to the embodiment.

First, as shown in FIG. 7, the terminal wire 64 is wound a plurality of times so as to approach the upper end of the bobbin 62 in the axial direction of the connecting pin 81, thereby forming a tied portion 82. At this time, the winding pitch 200, which is the interval between the centers of each terminal wire 64 of the binding portion 82, is formed so that it is larger than one time the wire diameter of the terminal wire 64. The wire diameter of the terminal wire 64 includes the thickness of the insulation coating. Here, the winding pitch 200 is the parallel distance between the centers of adjacent terminal lines 64. This is to prevent the terminal wires 64 of the binding portion 82 from overlapping each other during winding.

After forming the binding portion 82 of each terminal wire 64, as shown in FIG. 8, the binding portion 82 is pressed from the axially upper portion of the connecting pin 81 with the jig 300 so as to contact the upper end of the bobbin 62. The jig 300 has a cavity in the center into which the connecting pin 81 can be inserted. The tip of the jig 300 is mirror-polished so as not to damage the terminal wire 64. At this time, the upper end of the terminal wire 64 at the top of the binding portion 82 in the axial direction is pushed by the jig 300, and the jig 300 is pressed so that the winding pitch 201 is 1.0 times the wire diameter of the terminal wire 64. Press with tool 300. In other words, the terminal wires 64 forming the binding portion 82 are in contact with each other with a very small gap, and the lowest terminal wire 64 of the binding portion 82 is in contact with the upper end of the bobbin 62. Press with the jig 300 so that the

Next, as shown in FIG. 9, a horn 400 for performing ultrasonic bonding and an anvil 401 serving as a receiving jig are placed on both sides of the binding portion 82. That is, the horn 400 and the anvil 401 are brought into contact with the surface of the tied portion 82 perpendicularly to the connecting pin 81, and pressure is applied perpendicularly to the connecting pin 81 from the horn 400 side to perform solid phase bonding using ultrasonic waves. Thus, the binding portion 82 and the connecting pin 81 are electrically connected. Since solid-phase bonding is performed using ultrasonic waves, the bonding time is extremely short, the temperature rise to the bobbin 62 is extremely small, and there is no decrease in the strength of the bobbin 62 as described above.

In addition, before performing solid-phase bonding using ultrasonic waves, the terminal wires 64 constituting the tied portion 82 are brought into contact with each other by pressing with the jig 300, so that the terminal wires 64 do not overlap each other. , the slippage of each terminal wire 64 during bonding by ultrasonic waves is suppressed, the surface pressure applied by the horn 400 becomes constant, and the circumferential height of each terminal wire 64 is aligned with respect to the pressing surface of the horn 400. , bonding variations can be suppressed, and bonding quality can be stabilized.

Since the tied portion 82 is pressurized, the pressed surface of the tied portion 82 is crushed to match the shape of the tip of the horn 400, leaving a pressure mark 402 as shown in FIGS. 10 and 11. If the shape of the tip of the horn 400 is wider than the width of both ends of the tied portion 82, especially if the connecting pin 81 is a prism, stress will be concentrated on the edge of the prism, making the terminal wire 64 thinner and more likely to break. Therefore, in the embodiment, the shape of the tip of the horn 400 is narrower than the width of the connecting pin 81. This makes it possible to suppress a decrease in the strength of the terminal wire 64 due to bonding.

As mentioned above, when performing ultrasonic bonding, the horn 400 on the output side and the anvil 401 on the receiving side are pressed perpendicularly to the opposing sides of the connection pin 81, which is a prismatic column, and the ultrasonic bonding is performed. Perform phase joining. By making the connecting pin 81 a square column and applying the horn 400 on the output side and the anvil 401 on the receiving side perpendicularly to the side surface of the connecting pin 81, the terminal wire 64 and the connecting pin 81 are aligned in a straight line on the side surface of the connecting pin 81. Since the terminal wire 64 and the connecting pin 81 are in contact with each other in a cylindrical shape, the joint area between the terminal wire 64 and the connecting pin 81 can be increased compared to the case where the connecting pin 81 is cylindrical.

Next, as shown in FIG. 12, a connection plate 800 is installed on the upper end surface of the bobbin 62. The wiring board 800 has a plurality of holes 801 through which the plurality of connection pins 81 are passed, and a plurality of cavities 802 that cover the tied portions 82 of the plurality of terminal wires 64. The terminal wire 64 of each coil 63 and the terminal wire 64 of another coil 63 are connected by the connection plate 800 . The connection plate 800 is made of a resin material, and has a cylindrical shape with a hollow having the same size as the inner diameter of the stator core 61, although not shown here.

In the embodiment, since the coil 63 and the terminal wire 64 are aluminum-based magnet wires, and the connection pins 81 are steel wires, corrosion is likely to occur in the electrolytic solution due to the potential difference, as described above. Since the stator 60 of the embodiment is mounted on a blower, it is necessary to consider the environment in which it will be used and cover the tied portions 82 with a moisture-proofing agent to improve corrosion resistance. As shown in FIG. 4, in the DIP soldering method of the comparative example, the binding part 42 is separated from the upper end of the bobbin 22 in the axial direction, and a moisture-proofing agent 43 is applied thereto and fixed, so that the binding part 42 is closed without any gaps. In order to cover the moisture proofing agent 43, a jig is required to receive the moisture proofing agent 43, which increases the variation in the shape of the moisture proofing agent 43.

In the embodiment, as shown in FIG. 13, a connection plate 800 is installed on the upper end surface of the bobbin 62 in the axial direction, and a moisture-proofing agent 83 is filled into the cavity 802 through the hole 801 through which the connection pin 81 is passed. As a result, the moisture-proofing agent 83 is filled along the upper end surface of the bobbin 62 and the cavity 802 of the wiring board 800, the shape of the moisture-proofing agent 83 can be made constant, and the moisture-proofing agent 83 is filled in the tied portion 82 without any gaps. can do.

Here, a hole is provided at one location in each cavity 802 of the wiring board 800, through which the terminal wire 64 coming out from each coil 63 and wound around the connecting pin 81 passes. Thereby, the terminal wire 64 is not pinched between the connection plate 800 and the bobbin 62, and leakage of the moisture proofing agent 83 filled in the cavity 802 can be suppressed.

Next, as shown in FIG. 14, a plurality of metal plate-shaped terminals 92 are fitted into the outer diameter side of the connection plate 800. The wiring board 800 is provided with a protrusion 803 into which the plate-shaped terminal 92 is fitted, and the plate-shaped terminal 92 is fitted by press-fitting. Although not shown here, each plate-shaped terminal 92 is connected with a metal lead wire. Then, in order to electrically connect the connecting pin 81 and the plate-shaped terminal 92, a solder 93 is formed by soldering with a small hand. Thereby, each coil 63 is connected to each other via the binding portion 82, the connecting pin 81, and the plate-shaped terminal 92.

In this manner, according to the embodiment, one end side of the bobbin 62 and one end side of the binding portion 82 are in contact with each other, and adjacent binding portions 82 wound around the connecting pin 81 are in contact with each other. Therefore, the axial length of the induction motor 101, which is a rotating electric machine, can be shortened.

Further, according to the embodiment, since the binding portion 82 and the connecting pin 81 are solid phase welded, there is no adverse thermal effect on the bobbin 62, and the bobbin 62 and the binding portion 82 are brought close to each other. Further, even if different metals are used for the coil 63 and the connecting pin 81, the formation of a compound layer between the different metals can be suppressed, and a good bond between the coil 63 and the connecting pin 81 can be achieved. It becomes possible. Further, according to the embodiment, since an aluminum-based magnet wire can be used for the coil 63, it is possible to reduce the weight of the induction motor 101 and, by extension, the blower using the induction motor 101.

Further, according to the embodiment, since the wiring board 800 has the cavity 802 that covers the tied portion 82 of the terminal wire 64, the moisture-proofing agent 83 can be filled without any gap around the tied portion 82. can. Further, since the cavity 802 is provided with a hole through which the terminal wire 64 passes, the terminal wire 64 is not pinched between the wiring board 800 and the bobbin 62, and leakage of the moisture-proofing agent 83 filled in the cavity 802 is suppressed. be able to.

The configurations shown in the embodiments described above are examples of the contents of the present disclosure, and can be combined with other known technologies, and the configurations can be modified without departing from the gist of the present disclosure. It is also possible to omit or change parts.

Hereinafter, various aspects of the present disclosure will be collectively described as supplementary notes.

(Additional note 1)
a stator core having a back yoke portion and a plurality of teeth portions protruding radially inward from the back yoke portion at intervals in the circumferential direction;
An insulating bobbin that covers each tooth part,
a metal connection pin fixed to one end of the bobbin;
a coil having a binding part in which the terminal wire is wound around the connection pin a plurality of times, and the coil is wound around the teeth part via the bobbin;
Equipped with
one end of the binding portion and the one end of the bobbin are in contact with each other,
A stator characterized in that the adjacent tied portions wound around the connection pin are in contact with each other.
(Additional note 2)
The stator according to appendix 1, wherein the winding pitch of the binding portion wound around the connection pin is one time the wire diameter including the thickness of the insulation coating of the terminal wire.
(Additional note 3)
The stator according to appendix 1 or 2, wherein the binding portion and the connection pin are solid phase joined.
(Additional note 4)
The stator according to appendix 3, wherein the coil including the terminal wire and the connection pin are made of different metals.
(Appendix 5)
5. The stator according to appendix 3 or 4, wherein the solid phase bonding is performed by applying pressure and ultrasonic waves.
(Appendix 6)
The stator according to appendix 5, wherein the width of the pressure mark formed on the connection pin is narrower than the width of the connection pin in the radial direction.
(Appendix 7)
A connection plate is provided at the one end of the bobbin to which the connection pin is fixed, and connects the coils via the connection pin,
8. The stator according to any one of appendices 1 to 7, wherein the connection plate has a cavity that covers the tied portion wound around the connection pin.
(Appendix 8)
The stator according to appendix 7, wherein the cavity is filled with a moisture proofing agent.
(Appendix 9)
The stator according to appendix 8, wherein the cavity has a hole through which the terminal wire passes.
(Appendix 10)
The stator described in any one of Supplementary Notes 1 to 9,
a rotor with a shaft;
A rotating electrical machine characterized by comprising:
(Appendix 11)
The rotating electrical machine described in Appendix 10,
a propeller fan attached to the shaft;
A blower characterized by comprising:
(Appendix 12)
a step of attaching an insulating bobbin covering each tooth portion to a stator core having a plurality of teeth portions projecting radially inward at intervals in the circumferential direction;
fixing a metal connection pin to one end of the bobbin;
winding a coil around each tooth portion of the stator core via the bobbin;
a step of winding the terminal wire of the coil around the connecting pin a plurality of times to form a tied portion;
The tied portion is axially moved with a jig so that one end of the tied portion and the one end of the bobbin are in contact with each other, and adjacent tied portions wound around the connection pin are in contact with each other. a pressing process;
solid phase joining the tied portion and the connecting pin by applying ultrasonic waves while pressurizing the tied portion and the connecting pin;
A method for manufacturing a stator, comprising:

5a, 5b bearing, 20, 60 stator, 21, 61 stator core, 22, 62 bobbin, 23, 63 coil, 24, 64 terminal wire, 25, 65 insertion hole, 30 rotor, 31 rotor core, 32 shaft, 41, 81 connection pin, 42, 82 binding part, 43, 83 moisture proofing agent, 51 capacitor, 61a teeth part, 61b back yoke part, 62a end part, 92 plate terminal, 100 propeller fan, 101 induction motor, 200, 201 winding pitch, 300 jig, 400 horn, 401 anvil, 402 pressure mark, 800 connection plate, 801 hole, 802 cavity, 803 protrusion, C axis.

Claims (12)

a stator core having a back yoke portion and a plurality of teeth portions protruding radially inward from the back yoke portion at intervals in the circumferential direction;
An insulating bobbin that covers each tooth part,
a metal connection pin fixed to one end of the bobbin;
a coil having a binding part in which the terminal wire is wound around the connection pin a plurality of times, and the coil is wound around the teeth part via the bobbin;
Equipped with
one end of the binding portion and the one end of the bobbin are in contact with each other,
A stator characterized in that the adjacent tied portions wound around the connection pin are in contact with each other. The stator according to claim 1, wherein the winding pitch of the binding portion wound around the connection pin is one time the wire diameter including the thickness of the insulation coating of the terminal wire. The stator according to claim 1, wherein the binding portion and the connection pin are solid phase joined. The stator according to claim 3, wherein the coil including the terminal wire and the connection pin are made of different metals. The stator according to claim 3, wherein the solid phase bonding is performed by applying pressure and ultrasonic waves. The stator according to claim 5, wherein the width of the pressure mark formed on the connection pin is narrower than the width of the connection pin in the radial direction. A connection plate is provided at the one end of the bobbin to which the connection pin is fixed, and connects the coils via the connection pin,
The stator according to claim 1, wherein the connection plate has a cavity that covers the tied portion wound around the connection pin. The stator according to claim 7, wherein the cavity is filled with a moisture proofing agent. The stator according to claim 8, wherein the cavity has a hole through which the terminal wire passes. The stator according to any one of claims 1 to 9,
a rotor with a shaft;
A rotating electrical machine characterized by comprising: A rotating electric machine according to claim 10,
a propeller fan attached to the shaft;
A blower characterized by comprising: a step of attaching an insulating bobbin covering each tooth portion to a stator core having a plurality of teeth portions projecting radially inward at intervals in the circumferential direction;
fixing a metal connection pin to one end of the bobbin;
winding a coil around each tooth portion of the stator core via the bobbin;
a step of winding the terminal wire of the coil around the connecting pin a plurality of times to form a tied portion;
The tied portion is axially moved with a jig so that one end of the tied portion and the one end of the bobbin are in contact with each other, and adjacent tied portions wound around the connection pin are in contact with each other. a pressing process;
solid phase joining the tied portion and the connecting pin by applying ultrasonic waves while pressurizing the tied portion and the connecting pin;
A method for manufacturing a stator, comprising:

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