WO2022249307A1

WO2022249307A1 - Electric motor and air conditioner

Info

Publication number: WO2022249307A1
Application number: PCT/JP2021/019900
Authority: WO
Inventors: 諒伍 ▲高▼橋; 和慶土田; 隆徳渡邉; 貴也下川
Original assignee: 三菱電機株式会社
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-12-01
Also published as: JPWO2022249307A1

Abstract

An electric motor (1) includes: a stator (3); a circuit board (4) fixed to the stator (3); a mold resin (6) covering the stator (3) and the circuit board (4); and a lead wire (5) connected to the circuit board (4). The mold resin (6) has a hollow part (61). A first end (51) of the lead wire (5) is fixed to the circuit board (4), and a second end (52) of the lead wire (5) is located outside the mold resin (6). A section of the lead wire (5) located between the first end (51) and the second end (52) is disposed in the hollow part (61).

Description

Electric motors and air conditioners

The present disclosure relates to electric motors and air conditioners.

An electric motor in which a stator and a substrate fixed to the stator are covered with resin (also referred to as "mold resin") has been proposed (see Patent Document 1, for example).

JP 2018-093580 A

However, in the conventional technology, water may reach the board through the gap between the lead wire and the mold resin, and this water may cause the board to malfunction.

The purpose of the present disclosure is to prevent water from reaching the substrate through the gap between the lead wire and the mold resin.

The electric motor of the present disclosure is
a stator;
a circuit board fixed to the stator;
a mold resin having a cavity and covering the stator and the circuit board;
lead wires connected to the circuit board;
with
a first end of the lead wire fixed to the circuit board;
A second end of the lead wire extends outside the mold resin,
A portion of the lead between the first end and the second end is provided within the cavity.
Other electric motors of the present disclosure include:
a stator;
a circuit board fixed to the stator;
a mold resin covering the stator and the circuit board;
lead wires connected to the circuit board;
a first component, a second component facing the first component, and a hollow portion provided between the first component and the second component; provided with a cover part and
a first end of the lead wire fixed to the circuit board;
A second end of the lead wire extends outside the mold resin,
A portion of the lead between the first end and the second end is provided within the cavity.
The air conditioner of the present disclosure is
indoor unit and
and an outdoor unit connected to the indoor unit,
Each of the indoor unit, the outdoor unit, or the indoor unit and the outdoor unit has the electric motor.

According to the present disclosure, it is possible to prevent water from reaching the substrate through the gap between the lead wire and the mold resin.

1 is a cross-sectional view schematically showing an electric motor according to Embodiment 1; FIG. It is a side view which shows a stator roughly. It is a front view which shows a stator roughly. FIG. 4 is a front view schematically showing a circuit board (also simply referred to as “board”) fixed to the stator; FIG. 4 is a cross-sectional view schematically showing an electric motor having mold resin as another example of mold resin; FIG. 3 is a cross-sectional view schematically showing another example of an electric motor; FIG. 5 is a cross-sectional view schematically showing still another example of the electric motor; FIG. 4 is a front view schematically showing a cover component provided around lead wires; FIG. 9 is a cross-sectional view of the cover part shown in FIG. 8; FIG. 4 schematically shows the structure of the cover part; FIG. 11 is a diagram schematically showing another example of a cover part; FIG. 10 is a diagram schematically showing still another example of a cover component; Figure 13 is a cross-sectional view showing the cover component shown in Figure 12 mounted around a lead; FIG. 10 is a diagram schematically showing still another example of a cover component; FIG. 5 is a cross-sectional view schematically showing still another example of the electric motor; FIG. 5 is a cross-sectional view schematically showing still another example of the electric motor; FIG. 4 is a diagram schematically showing the configuration of an air conditioner according to Embodiment 2;

Embodiment 1.
An electric motor 1 according to Embodiment 1 will be described below.
In the xyz orthogonal coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis A1 of the electric motor 1, and the x-axis direction (x-axis) indicates a direction orthogonal to the z-axis direction. , the y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction. The axis A<b>1 is the center of rotation of the rotor 2 , that is, the rotation axis of the rotor 2 . The direction parallel to the axis A1 is also referred to as "the axial direction of the rotor 2" or simply "the axial direction". A radial direction is a radial direction of the rotor 2, the stator 3, or the stator core 31, and is a direction perpendicular to the axis A1. The xy plane is a plane perpendicular to the axial direction. An arrow D1 indicates a circumferential direction about the axis A1. The circumferential direction of the rotor 2, stator 3, or stator core 31 is also simply referred to as "circumferential direction".

FIG. 1 is a cross-sectional view schematically showing an electric motor 1 according to Embodiment 1. FIG.
The electric motor 1 includes a rotor 2, a stator 3, a circuit board 4 fixed to the stator 3, lead wires 5 connected to the circuit board 4, a mold resin 6 covering the stator 3 and the circuit board 4, It has

bearings

7a and 7b. In the example shown in FIG. 1, the electric motor 1 further has a bracket 8a. The electric motor 1 is, for example, a permanent magnet synchronous motor, but is not limited to this.

Bearings

7a and 7b rotatably support shaft 22 of rotor 2 .

The rotor 2 is rotatably arranged inside the stator 3 . An air gap exists between the rotor 2 and the stator 3 . The rotor 2 has a rotor core 21 and a shaft 22 . The rotor 2 is rotatable around a rotation axis (that is, axis A1). The rotor 2 may also have permanent magnets for forming the magnetic poles of the rotor 2 .

FIG. 2 is a side view schematically showing the stator 3. FIG.
FIG. 3 is a front view schematically showing the stator 3. FIG.

The stator 3 has a stator core 31 , at least one winding 32 (also called stator winding), and at least one insulating portion 33 . For example, the stator core 31 , the windings 32 and the insulating portion 33 are integrally molded with the molding resin 6 .

The stator core 31 has at least one tooth 311. In this embodiment, stator core 31 has a plurality of teeth 311 . For example, the stator core 31 is formed of a plurality of magnetic steel sheets laminated in the axial direction. In this case, each of the plurality of electromagnetic steel sheets is formed into a predetermined shape by punching. These electromagnetic steel sheets are fixed to each other by caulking, welding, adhesion, or the like.

The windings 32 are, for example, magnet wires. The winding 32 is wound around the insulating portion 33 . A coil is formed by winding the wire 32 around the insulating portion 33 . The winding 32 is electrically connected to a terminal 32a (also referred to as a winding terminal). In the example shown in FIG. 2, the end of the winding 32 is hooked on the hook of the terminal 32a and fixed to the terminal 32a by fusing or soldering. The terminal 32 a is fixed to the insulating portion 33 and electrically connected to the circuit board 4 .

The insulating portion 33 is provided on each tooth 311, for example. For example, the insulating portion 33 is combined with each tooth 311 . The insulating portion 33 has at least one fixing portion 331 for fixing the circuit board 4 . The insulating portion 33 is, for example, thermoplastic resin such as polybutylene terephthalate (PBT). The insulating portion 33 electrically insulates the stator core 31 (specifically, each tooth 311 of the stator core 31). For example, the insulating portion 33 is molded integrally with the stator core 31 . However, the insulating portion 33 may be molded in advance and the molded insulating portion 33 may be combined with the stator core 31 .

FIG. 4 is a front view schematically showing the circuit board 4 fixed to the stator 3. FIG.
The circuit board 4 has positioning holes 43 (also simply referred to as “holes”) that engage with the fixing portions 331 (specifically, the protrusions 331a) of the insulating portion 33 .

The fixing portion 331 of the insulating portion 33 has a projection 331a and a support portion 331b. The protrusion 331 a is inserted into a positioning hole 43 formed in the circuit board 4 . For example, the protrusion 331a is fixed to the circuit board 4 (specifically, the positioning hole 43) by a fixing method such as heat welding or ultrasonic welding. As a result, the circuit board 4 is fixed to the insulating portion 33 . The support portion 331b supports the circuit board 4 in the axial direction and positions the circuit board 4 in the axial direction. The circuit board 4 is positioned on one end side of the stator 3 in the axial direction of the stator 3 .

The circuit board 4 includes a drive circuit 42. The drive circuit 42 is fixed to the circuit board 4 . The drive circuit 42 is a circuit for controlling rotation of the rotor 2 . The drive circuit 42 includes, for example, a drive element 42a and a Hall IC (Integrated Circuit) 42b.

The drive element 42a is, for example, a power transistor. Hall IC 42b detects the magnetic flux from rotor 2 in order to detect the rotational position of rotor 2 .

As shown in FIG. 1 , the lead wire 5 has a first end 51 that is one end of the lead wire 5 and a second end 52 that is the other end of the lead wire 5 . In this embodiment, lead wires 5 are directly connected to circuit board 4 . Specifically, the first end 51 of the lead wire 5 is fixed to the circuit board 4 . In the example shown in FIG. 1 , the first end 51 is covered with the mold resin 6 . The other end of the lead wire 5 extends out of the mold resin 6 through the opening 62 of the mold resin 6 . That is, the second end 52 of the lead wire 5 is exposed outside the mold resin 6 through the opening 62 of the mold resin 6 . A portion of the lead wire 5 between the first end portion 51 and the second end portion 52 is provided within a hollow portion 61 of the mold resin 6 .

The mold resin 6 is a resin that covers the stator 3 and the circuit board 4. Mold resin 6 is, for example, thermosetting resin such as bulk molding compound (BMC). Bulk molding compounds are suitable for insert molding as they allow low pressure molding. When a bulk molding compound is used as the mold resin 6, deformation of inserts such as the circuit board 4 or the stator core 31 can be prevented when molding the mold resin 6 using a mold, and the quality of the electric motor 1 can be improved. can be improved.

The molding resin 6 may be a thermoplastic resin such as polyphenylene sulfide (PPS).

For example, the stator core 31, the windings 32, and the insulating portion 33 may be integrally molded with the mold resin 6. In this case, the stator core 31, the windings 32, the insulating portion 33, and the mold resin 6 are integrated as one component (also called a molded stator).

The mold resin 6 has a hollow portion 61 and an opening 62 . In the example shown in FIG. 1, a hollow portion 61 is provided inside the mold resin 6 . In the example shown in FIG. 1 , a hollow portion 61 is provided between the first end portion 51 of the lead wire 5 and the opening 62 of the mold resin 6 . The lead wire 5 passes through the inside of the hollow portion 61 . The cavity 61 communicates with the opening 62 . The opening 62 communicates with the outside of the mold resin 6 . The hollow portion 61 is formed by, for example, a molding die.

The shape of the hollow portion 61 is, for example, a sphere or a cube, but is not limited to these shapes.

The longest length between the lead wire 5 in the cavity 61 and the inner surface of the cavity 61 is desirably 0.1 mm or more. If the longest length between the lead wire 5 in the cavity 61 and the inner surface of the cavity 61 is 0.1 mm or more, even if water reaches the cavity 61, the water stops at the cavity 61. , water can be prevented from further entering the interior of the mold resin 6 through the gap between the lead wire 5 and the mold resin 6 .

Modification 1.
Other examples of the mold resin 6 will be described below.
FIG. 5 is a cross-sectional view schematically showing electric motor 1 having mold resin 6 as another example of mold resin 6 described in the present embodiment.

As shown in FIG. 5, the cavity 61 may be exposed to the outside of the mold resin 6. In other words, the cavity 61 may communicate with the outside air existing outside the mold resin 6 . In this case, the first ends 51 of the lead wires 5 are exposed outside the mold resin 6 . That is, the first ends 51 of the lead wires 5 are not covered with the mold resin 6 . For example, the first ends 51 of the lead wires 5 are not in contact with the mold resin 6 .

In the example shown in FIG. 5 , part of the circuit board 4 is covered with the mold resin 6 , and the part of the circuit board 4 to which the first end 51 is fixed is outside the mold resin 6 . exposed to

Further, the hollow portion 61 may be exposed to the outside of the electric motor 1. In other words, the cavity 61 may communicate with the outside air existing outside the electric motor 1 . In this case, the first ends 51 of the lead wires 5 are exposed outside the electric motor 1 .

FIG. 6 is a sectional view schematically showing another example of electric motor 1 described in the present embodiment.
In Modification 1, the electric motor 1 may have a bracket 8 b that covers the first end 51 . In this case, it is desirable that the bracket 8b covers the circuit board 4 entirely. For example, the bracket 8b is fixed to the end of the mold resin 6 in the axial direction by press fitting or screws.

The configuration of the electric motor 1 shown in FIGS. 1 to 4 other than the mold resin 6 can be applied to the electric motor 1 according to the first modification.

Modification 2.
A motor 1 according to Modification 2 as another example of the motor 1 described in the present embodiment will be described below.
FIG. 7 is a cross-sectional view schematically showing the electric motor 1 according to Modification 2. As shown in FIG.
FIG. 8 is a front view schematically showing cover component 9 provided around lead wire 5 .
FIG. 9 is a cross-sectional view of the cover component 9 shown in FIG.
In Modification 2, the electric motor 1 has a cover component 9 provided around the lead wires 5 . The cover component 9 is made of resin, for example. For example, the cover part 9 is made of thermoplastic resin such as PBT.

The configuration of the electric motor 1 shown in FIGS. 1 to 6 is applicable to the electric motor 1 according to Modification 2.

FIG. 10 is a diagram schematically showing the structure of the cover part 9. As shown in FIG.
The cover component 9 includes a first component 91 , a second component 92 facing the first component 91 , and a hollow portion 90 provided between the first component 91 and the second component 92 . have. The cover component 9 is provided between a first end 51 of the lead 5 and a second end 52 of the lead 5 . Accordingly, cavity 90 is provided between first end 51 and second end 52 . That is, part of the lead wire 5 is arranged between the first component 91 and the second component 92 . A portion of the lead 5 between the first end 51 and the second end 52 is provided within the cavity 90 .

The cover component 9 has two through holes into which the lead wires 5 are inserted. Therefore, the first part 91 has a through hole into which the lead wire 5 is inserted, and the second part 92 has another through hole into which the lead wire 5 is inserted. A first end portion 51 of the lead wire 5 is fixed to the circuit board 4 , and a second end portion 52 of the lead wire 5 is outside the mold resin 6 .

The longest length between the lead wire 5 in the cover component 9 and the inner surface of the cover component 9 is desirably 0.1 mm or more. If the longest length between the lead wire 5 in the cover part 9 and the inner surface of the cover part 9 is 0.1 mm or more, even if the water reaches the cover part 9, the water stops at the cavity 90. , water can be prevented from further entering the interior of the mold resin 6 through the gap between the lead wire 5 and the mold resin 6 .

In the example shown in FIG. 7 , the cover component 9 is provided between the opening 62 of the mold resin 6 and the first end 51 of the lead wire 5 . For example, the cover component 9 is embedded inside the mold resin 6 .

The first component 91 has a first recess 91a forming a hollow portion 90 . The first part 91 has a contact surface 91 b (also referred to as a first contact surface) that contacts the second part 92 . A first part 91 is combined with a second part 92 . The contact surface 91 b is parallel to the lead wire 5 arranged in the cavity 90 . In other words, the contact surface 91b is parallel to the direction in which the lead wire 5 extends within the hollow portion 90 . The contact surface 91 b of the first component 91 is in contact with the contact surface 92 b of the second component 92 . The first component 91 is made of resin, for example.

The second part 92 is combined with the first part 91 and covers the first recess 91a. With this configuration, a cavity 90 is provided inside the cover part 9 . The second component 92 is made of resin, for example. In the example shown in FIG. 10, the second component 92 has a second recess 92a forming the cavity 90 and a contact surface 92b (also referred to as a second contact surface) in contact with the first component 91. and The contact surface 92b of the second component 92 is in contact with the contact surface 91b of the first component 91. As shown in FIG. The contact surface 92b is parallel to the lead wire 5 arranged in the cavity 90. As shown in FIG. In other words, the contact surface 92b is parallel to the direction in which the lead wire 5 extends within the hollow portion 90 .

The first part 91 may have at least one first engaging portion 91c that engages the second part 92 , and the second part 92 has at least one part that engages the first part 91 . It may have one second engaging portion 92c. In the example shown in FIG. 10, each first engaging portion 91c is a recess and each second engaging portion 92c is a protrusion. In this case, when each second component 92 is combined with the first component 91, each second engaging portion 92c engages with the first engaging portion 91c.

At least one first engaging portion 91c may be a protrusion. In this case, the second engaging portion 92c that engages with the first engaging portion 91c is a recess.

FIG. 11 is a diagram schematically showing another example of the cover component 9. As shown in FIG.
The cover part 9 shown in FIG. 11 differs from the cover part 9 shown in FIG. 10 in that the second part 92 does not have a second recess 92a.

12A and 12B schematically show still another example of the cover component 9. FIG.
13 is a cross-sectional view showing the cover component 9 shown in FIG. 12 provided around the lead 5. FIG.
In the cover component 9 shown in FIGS. 12 and 13, the orientation of the contact surface 91b of the first component 91 and the orientation of the contact surface 92b of the second component 92 are different from those of the first component 91 in the example shown in FIG. and the orientation of the contact surface 92b of the second part 92 are different.

Specifically, the contact surface 91 b of the first component 91 is perpendicular to the lead wire 5 arranged in the cavity 90 of the cover component 9 . In other words, the contact surface 91 b of the first component 91 is perpendicular to the direction in which the lead wire 5 extends within the cavity 90 of the cover component 9 . In this case, the contact surfaces 92b of the second part 92 are perpendicular to the leads 5 arranged in the cavity 90 of the cover part 9. FIG. In other words, the contact surface 92b of the second component 92 is perpendicular to the direction in which the lead wire 5 extends within the cavity 90 of the cover component 9. As shown in FIG.
14A and 14B schematically show still another example of the cover component 9. FIG.
The cover part 9 shown in FIG. 14 differs from the cover part 9 shown in FIG. 12 in that the second part 92 does not have a second recess 92a.

FIG. 15 is a cross-sectional view schematically showing another example of the electric motor 1 according to Modification 2. As shown in FIG.
In the example shown in FIG. 15 , part of the cover component 9 is fixed to the mold resin 6 and another part of the cover component 9 is exposed outside the mold resin 6 . For example, part of the cover component 9 is fixed to the opening 62 of the mold resin 6 . The cover part 9 shown in FIGS. 8 to 14 can also be applied to the electric motor 1 shown in FIG.

FIG. 16 is a cross-sectional view schematically showing still another example of the electric motor 1 according to Modification 2. As shown in FIG.
In the example shown in FIG. 16, the cover component 9 is fixed to the circuit board 4. In the example shown in FIG. The cover part 9 shown in FIGS. 8 to 14 can also be applied to the electric motor 1 shown in FIG.

<Advantages of this embodiment>
A portion of the lead wire 5 between the first end portion 51 and the second end portion 52 is provided inside the hollow portion 61 of the mold resin 6 . That is, the lead wire 5 passes through the inside of the hollow portion 61 . With this configuration, even if water enters the mold resin 6 from outside the electric motor 1 through the gap between the opening 62 and the lead wire 5 , the water can be retained in the cavity 61 . As a result, even if water passes through the gap between the opening 62 and the lead wire 5 from the outside of the electric motor 1, the water stops at the cavity 61 and the water passes through the gap between the lead wire 5 and the mold resin 6. Reaching the circuit board 4 can be prevented.

The hollow portion 61 may be exposed outside the mold resin 6 . In this case, the hollow portion 61 can be easily formed with a molding die. Furthermore, when the cavity 61 is exposed to the outside of the mold resin 6, the water accumulated inside the cavity 61 is likely to evaporate. As a result, water accumulated inside the cavity 61 is easily discharged to the outside of the mold resin 6 .

The hollow portion 61 may be exposed to the outside of the electric motor 1. In this case, the hollow portion 61 can be easily formed with a molding die. Furthermore, when the hollow portion 61 is exposed to the outside of the electric motor 1, the water accumulated inside the hollow portion 61 is likely to evaporate. As a result, the water accumulated inside the hollow portion 61 is easily discharged to the outside of the electric motor 1 .

As described in Modification 1, the first end 51 of the lead wire 5 may be exposed outside the electric motor 1 . In this case, part of the circuit board 4 can be fixed to the molding resin 6 by insert molding. Furthermore, even if water enters the gap between the opening 62 and the lead wire 5 from the outside of the electric motor 1 , the water is easily discharged to the outside of the mold resin 6 through the cavity 61 .

As described in modification 1, the electric motor 1 may have a bracket 8b covering the first end 51. In this case, water can be prevented from reaching the circuit board 4 from outside the electric motor 1 . Furthermore, when the bracket 8 b covers the entire circuit board 4 , it is possible to prevent the circuit board 4 from being exposed to the outside of the electric motor 1 . As a result, water can be effectively prevented from reaching the circuit board 4 from outside the electric motor 1 .

As described in modification 2, the electric motor 1 may have a cover component 9 provided around the lead wires 5 . In this case, a portion of the lead 5 between the first end 51 and the second end 52 is provided within the cavity 90 of the cover part 9 . That is, the lead wire 5 passes through the inside of the hollow portion 90 of the cover component 9 . With this configuration, even if water enters the mold resin 6 from outside the electric motor 1 through the gap between the opening 62 and the lead wire 5, the water can be stored in the cavity 90 of the cover component 9. As a result, even if water passes through the gap between the opening 62 and the lead wire 5 from the outside of the electric motor 1, the water stops at the cavity 90 and the water passes through the gap between the lead wire 5 and the mold resin 6. Reaching the circuit board 4 can be prevented.

When the cover part 9 is composed of a plurality of parts (for example, the first part 91 and the second part 92), the cavity 90 can be easily formed, and the lead wire 5 can be placed in the cavity 90. can be easily placed.

If the first component 91 has a first recess 91a forming the cavity 90 and the second component 92 has a second recess 92a forming the cavity 90, the lead 5 in the cavity 90 are not in contact with the cover part 9. In other words, the lead wire 5 within the cover component 9 is surrounded by the cavity 90 and there is a portion of the lead wire 5 that is not in contact with the cover component 9 . In this case, even if water from outside the electric motor 1 reaches the cover component 9 along the lead wire 5, the water stops at the cavity 90 and passes through the gap between the lead wire 5 and the mold resin 6 to form a circuit. Reaching the substrate 4 can be prevented.

When the contact surface 91b of the first part 91 of the cover part 9 is parallel to the lead wire 5 arranged in the cavity 90, the second part 92 can be easily combined with the first part 91.

When the contact surface 91b of the first part 91 of the cover part 9 is perpendicular to the lead wire 5 arranged in the cavity 90, the contact surface 91b of the first part 91 and the contact surface of the second part 92 Even if water gets into the gap between 92b, the water can be prevented from reaching the circuit board 4.例文帳に追加

When the cover part 9 is made of resin, when molding the mold resin 6 using a mold such as a metal mold, the cover part 9 is more likely to be placed in the mold than a cover part made of a metal material. It can be tightly attached. As a result, it is possible to prevent the material of the mold resin 6 from leaking out of the mold when molding the mold resin 6 .

In the case where the first part 91 of the cover part 9 and the second part 92 of the cover part 9 are made of resin, the first part 91 becomes the second part compared to the cover part made of metal material. 92 can be easily engaged.

When part of the cover component 9 is fixed to the mold resin 6 and the other part of the cover component 9 is exposed outside the mold resin 6, even if water reaches the cover component 9, the water stops at the cavity 90, and water can be prevented from further entering the inside of the mold resin 6 through the gap between the lead wire 5 and the mold resin 6.例文帳に追加As a result, water can be prevented from reaching the circuit board 4 .

When the cover component 9 is fixed to the circuit board 4, the circuit board 4, the lead wires 5, and the cover component 9 can be treated as one component. As a result, the electric motor 1 can be manufactured easily. In particular, the molding resin 6 can be easily molded.

Embodiment 2.
An air conditioner 10 (also referred to as a refrigeration air conditioner or a refrigeration cycle device) according to Embodiment 2 will be described.
FIG. 17 is a diagram schematically showing the configuration of air conditioner 10 according to Embodiment 2. As shown in FIG.

An air conditioner 10 according to Embodiment 2 includes an indoor unit 11 as a fan (also referred to as a first fan) and an outdoor unit 13 as a fan (also referred to as a second fan) connected to the indoor unit 11. have

In this embodiment, the air conditioner 10 has an indoor unit 11, a refrigerant pipe 12, and an outdoor unit 13. For example, the outdoor unit 13 is connected to the indoor unit 11 through the refrigerant pipe 12 .

The indoor unit 11 includes an electric motor 11a (for example, the electric motor 1 according to Embodiment 1), a blower section 11b that blows air by being driven by the electric motor 11a, and a housing 11c that covers the electric motor 11a and the blower section 11b. . The air blower 11b has, for example, blades 11d driven by an electric motor 11a. For example, blades 11d are fixed to the shaft of electric motor 11a and generate airflow.

The outdoor unit 13 includes an electric motor 13a (for example, the electric motor 1 according to Embodiment 1), an air blower 13b, a compressor 14, a heat exchanger (not shown), an air blower 13b, a compressor 14, and a heat exchanger. and a housing 13c covering the exchanger. The air blower 13b blows air by being driven by the electric motor 13a. The air blower 13b has, for example, blades 13d driven by an electric motor 13a. For example, the blades 13d are fixed to the shaft of the electric motor 13a and generate airflow. The compressor 14 includes an electric motor 14a (for example, the electric motor 1 according to Embodiment 1), a compression mechanism 14b (for example, a refrigerant circuit) driven by the electric motor 14a, and a housing 14c that covers the electric motor 14a and the compression mechanism 14b. have.

In the air conditioner 10, at least one of the indoor unit 11 and the outdoor unit 13 has the electric motor 1 described in the first embodiment. That is, each of the indoor unit 11, the outdoor unit 13, or the indoor unit 11 and the outdoor unit 13 has the electric motor 1 described in the first embodiment. Specifically, the electric motor 1 described in the first embodiment is applied to at least one of the

electric motors

11a and 13a as the driving source of the air blower. That is, the electric motor 1 described in Embodiment 1 is applied to each of the indoor unit 11 and the outdoor unit 13 or the indoor unit 11 and the outdoor unit 13 . The electric motor 1 described in the first embodiment may be applied to the electric motor 14 a of the compressor 14 .

The air conditioner 10 can perform air conditioning, for example, a cooling operation in which cold air is blown from the indoor unit 11 and a heating operation in which warm air is blown. In the indoor unit 11, the electric motor 11a is a drive source for driving the air blower 11b. The air blower 11b can blow the adjusted air.

In the indoor unit 11, the electric motor 11a is fixed to the housing 11c of the indoor unit 11 with screws, for example. In the outdoor unit 13, the electric motor 13a is fixed to the housing 13c of the outdoor unit 13 with screws, for example.

In the air conditioner 10 according to Embodiment 2, since the electric motor 1 described in Embodiment 1 is applied to at least one of the

electric motors

11a and 13a, the same advantages as those described in Embodiment 1 can be obtained. can be done. As a result, failure of the air conditioner 10 can be prevented.

Furthermore, when the electric motor 1 according to Embodiment 1 is used as the drive source for the blower (for example, the indoor unit 11), the same advantages as those described in Embodiment 1 can be obtained. As a result, failure of the blower can be prevented. The blower having the electric motor 1 according to Embodiment 1 and the blades (for example, the

blades

11d or 13d) driven by the electric motor 1 can be used alone as a device for blowing air. This blower can also be applied to devices other than the air conditioner 10 .

Furthermore, when the electric motor 1 according to Embodiment 1 is used as the drive source for the compressor 14, the same advantages as those described in Embodiment 1 can be obtained. As a result, failure of the compressor 14 can be prevented.

The electric motor 1 described in Embodiment 1 can be installed in equipment having a drive source, such as a ventilation fan, a home appliance, or a machine tool, in addition to the air conditioner 10 .

The features of each embodiment and the features of each modification described above can be combined with each other.

1, 11a, 13a, 14a electric motor, 2 rotor, 3 stator, 4 circuit board, 5 lead wire, 6 molded resin, 7a, 7b bearing, 8a, 8b bracket, 9 cover parts, 10 air conditioner, 11 indoor unit, 12 refrigerant pipe, 13 outdoor unit, 31 stator core, 32 winding, 33 insulation, 42 drive circuit, 51 first end, 52 second end, 61, 90 cavity, 91 first part, 91a First concave portion, 91b, 92b Contact surface, 91c First engaging portion, 92 Second part, 92a Second concave portion, 92c Second engaging portion.

Claims

a stator;
a circuit board fixed to the stator;
a mold resin having a cavity and covering the stator and the circuit board;
lead wires connected to the circuit board;
with
a first end of the lead wire fixed to the circuit board;
A second end of the lead wire extends outside the mold resin,
A portion of the lead wire between the first end and the second end is provided within the cavity.
The electric motor according to claim 1, wherein the hollow portion is exposed to the outside of the electric motor.
a stator;
a circuit board fixed to the stator;
a mold resin covering the stator and the circuit board;
lead wires connected to the circuit board;
a first component, a second component facing the first component, and a hollow portion provided between the first component and the second component; provided with a cover part and
a first end of the lead wire fixed to the circuit board;
A second end of the lead wire extends outside the mold resin,
A portion of the lead wire between the first end and the second end is provided within the cavity.
the first component has a first recess forming the cavity;
The electric motor according to claim 3, wherein the second part is combined with the first part and covers the first recess.
The electric motor according to claim 4, wherein the second component has a second recess forming the cavity.
the first component has a contact surface in contact with the second component;
The electric motor according to claim 4 or 5, wherein the contact surface is parallel to the lead wires arranged in the cavity.
the first component has a contact surface in contact with the second component;
The electric motor according to claim 4 or 5, wherein the contact surface is perpendicular to the lead wires arranged in the cavity.
A part of the cover component is fixed to the mold resin,
The electric motor according to any one of claims 3 to 7, wherein another part of the cover component is exposed outside the mold resin.
The electric motor according to any one of claims 3 to 7, wherein the cover component is fixed to the circuit board.
The electric motor according to any one of claims 3 to 9, wherein the cover component is made of resin.
The electric motor according to any one of claims 1 to 10, wherein the first ends of the lead wires are exposed to the outside of the electric motor.
The electric motor according to claim 11, further comprising a bracket covering said first end.
indoor unit and
and an outdoor unit connected to the indoor unit,
Each of the indoor unit, the outdoor unit, or the indoor unit and the outdoor unit has the electric motor according to any one of claims 1 to 12. An air conditioner.