WO2021131945A1

WO2021131945A1 - In-wheel electric device

Info

Publication number: WO2021131945A1
Application number: PCT/JP2020/046898
Authority: WO
Inventors: 龍一郎岩野; 隆宏荒木
Original assignee: 株式会社日立製作所
Priority date: 2019-12-26
Filing date: 2020-12-16
Publication date: 2021-07-01
Also published as: CN114766076A; JP7339882B2; JP2021106472A

Abstract

The in-wheel electric device according to the present invention is connected to a wheel, wherein a stator is provided with: a core material around which a coil is wound; an inverter circuit unit; a fixing member for fixing a bearing for rotationally supporting a rotating shaft of a rotor; and a stator cover for integrating the core material, the inverter circuit unit, and the fixing member. The inverter circuit unit is disposed on a first coil end-side of the core material. The fixing member and the stator cover form: an inverter flow path for flowing a refrigerant to the inverter circuit unit; a relay flow path connected to the inverter flow path and also connected to a second coil end-side of the core material on the opposite side to the first coil end-side; and a second coil end-side flow path connected to the relay flow path and leading the refrigerant along the second coil end.

Description

Electric device with built-in wheel

The present invention relates to an electric device with a built-in wheel.

Conventionally, it has been necessary to increase the output density of motors with the recent electrification of automobiles and aircraft, so there is a demand for technology for improving the cooling performance of motors and reducing the size of motors themselves.

The following patent documents are known as background techniques of the present invention. Patent Document 1 discloses a technique in which an annular oil jacket is provided at both ends of a stator of a motor and an axial refrigerant flow path is provided in a status lot. Further, Patent Document 2 discloses a technique in which a motor and an inverter circuit unit are mounted and integrated inside a tire wheel.

Japanese Unexamined Patent Publication No. 2001-145302 Japanese Unexamined Patent Publication No. 2014-213622

The problem with the technology of Patent Document 1 is that by integrating the motor and the power converter, the distance between the two devices becomes shorter, and heat can be easily transferred from the motor to the power converter.

Further, in the technique of Patent Document 2, in the case of the air cooling method using a heat radiating plate, the cooling performance for the amount of heat generated including the cooling of the motor may not be sufficient, and there is a problem that the life of electrical parts is shortened or a failure is caused. It was.

The electric device with a built-in wheel according to the present invention is an electric device with a built-in wheel having a rotor and a stator connected to the wheel, and the stator is a core material around which a coil is wound and an inverter circuit for supplying power to the coil. The inverter circuit unit includes a unit, a fixing member for fixing a bearing that rotationally supports the rotation shaft of the rotor, and a stator cover for integrating the core material, the inverter circuit unit, and the fixing member. Is arranged on the first coil end side of the core material in the axial direction of the rotating shaft, and the fixing member and the stator cover are connected to an inverter flow path for flowing a refrigerant through the inverter circuit portion and the inverter flow path. A relay flow path connected to the second coil end side of the core material opposite to the first coil end side, and a second coil connected to the relay flow path and guiding the refrigerant along the second coil end. Form an end-side flow path.

According to the present invention, it is possible to achieve both improvement in cooling performance and miniaturization of an electric device having a built-in wheel.

It is sectional drawing which shows the electric device with a built-in wheel which concerns on 1st Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA of the stator portion of FIG. It is BB sectional view of the stator part of FIG. It is sectional drawing which shows the electric device with a built-in wheel which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the electric device with a built-in wheel which concerns on 3rd Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA of the stator portion of FIG. It is sectional drawing which shows the electric device with a built-in wheel which concerns on 4th Embodiment of this invention. FIG. 7 is a cross-sectional view taken along the line AA of the stator portion of FIG. It is a perspective view of the core material which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the electric device with a built-in wheel which concerns on 6th Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA of the stator portion of FIG. It is BB sectional view of the stator part of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Structure of electric device with built-in wheel, and first embodiment)
The first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing the configuration of the electric device with a built-in wheel according to the first embodiment, and FIGS. 2 and 3 are a cross-sectional view taken along the line AA and a cross-sectional view taken along the line BB of FIG. 1, respectively.

The motor 40, which is an electric device with a built-in wheel according to the first embodiment of the present invention, has an annular shape centered on a rotation shaft R, and is composed of a stator 1 and a rotor 2. The motor 40 of the present embodiment is an outer rotor type motor having a rotor 2 and a stator 1 connected to a wheel, and the rotor 2 is arranged on the outer peripheral side of the stator 1 via an air gap 3. ..

The stator 1 includes a stator core 6, a fixing member 7, stator covers 9a and 9b, an inverter circuit unit 10,

spacers

14a, 14b and 14c, and a partition wall 23. Details of each part will be described later.

The rotor 2 includes a permanent magnet 5 and is rotatably supported by a bearing 4 fixed by a fixing member 7 of the stator 1. A plurality of permanent magnets 5 are arranged in the circumferential direction of the rotor 2.

The stator core 6 is a core material and is held by the fixing member 7 by a method such as shrink fitting. On the outer peripheral side of the stator core 6, a plurality of slots extending in the axial direction are provided at predetermined intervals in the circumferential direction. A winding 8 which is a copper wire is wound around the tooth portion of the stator core 6 formed by the slot, and functions as a coil. The coil end on the side with the inverter circuit unit 10 in the axial direction of the rotating shaft R is referred to as the first coil end 8a, and the opposite side is referred to as the second coil end 8b.

The fixing member 7 fixes the bearing 4 and rotatably supports the rotor 2, and is arranged side by side with the stator 1 in the radial direction of the rotation shaft R to form a flow path for the refrigerant flowing in the stator 1. The flow structure of the refrigerant in the stator 1 will be described later.

The stator covers 9a and 9b are divided into a first cover 9a arranged on the opening side of the wheel and a second cover 9b arranged on the back side of the wheel. Further, the stator covers 9a and 9b form cavity regions at both ends in the axial direction in the stator 1, respectively, and surround the stator core 6 and the inverter circuit portion 10 arranged in the cavity region together with a part of the fixing member 7. , Is joined to a part of the fixing member 7. With this configuration, the stator core 6, the inverter circuit portion, and the fixing member 7 are integrated.

The stator cover 9a has a flow path inlet 13 and a flow path outlet 27 of the refrigerant 16 for liquid-cooling the motor 40, and enables circulation of the refrigerant 16 in the stator 1 described later. Further, the stator cover 9a is extended to the inner diameter side of the stator 1 so that the inverter circuit portion 10 for supplying electric power to the motor 40 is housed inside the stator 1 and the refrigerant 16 described later flows. As a result, the inverter circuit section cooling flow path 24 is formed in which the refrigerant flows through the inverter circuit section 10. The inverter circuit unit 10 is arranged on the first coil end side in the axial direction of the rotating shaft R, and has switching circuit units (power modules) 12a, 12b, 12c composed of semiconductor elements.

As shown in FIGS. 1 and 2, the inverter circuit unit 10 has an annular substrate 11 on which

openings

15a, 15b, 15c are formed, and a

switching circuit unit

12a, 12b, 12c. The

switching circuit units

12a, 12b, and 12c are arranged adjacent to the

openings

15a, 15b, and 15c, respectively. As a result, the refrigerant 16 flowing in from the flow path inlet 13 flows to both sides of the substrate 11 via the

openings

15a, 15b, 15c as shown by the

arrows

16a, 16b, 16c shown in FIGS. 1 and 2. By doing so, the

switching circuit units

12a, 12b, and 12c can be directly liquid-cooled from both sides of the substrate 11.

The partition wall 23 divides the space provided with the stator core 6 and the space provided with the inverter circuit portion 10 in the stator 1, and the end portion is joined to the stator cover 9a and the fixing member 7. As a result, the inverter circuit section cooling flow path 24 in which the refrigerant 16 directly liquid-cools the

switching circuit sections

12a, 12b, and 12c described above is formed, and leakage of the refrigerant to the stator core 6 side is suppressed.

Next, the flow structure of the refrigerant in the stator 1 will be described.

As described above, the refrigerant 16 flows in from the flow path inlet 13 provided in the stator cover 9a. The inflowing refrigerant 16 spreads in the circumferential direction on the substrate 11 and passes through the radial flow path defined by the

spacers

14a, 14b, 14c as shown in FIGS. 1 and 2. As a result, the refrigerant 16 flows as shown by

arrows

16a, 16b, 16c shown in FIGS. 1 and 2, and after cooling one side of the

switching circuit portions

12a, 12b, 12c, the opening 15a provided in the substrate 11 It passes through 15b and 15c. Further, the refrigerant 16 turns to the back surface of the substrate 11 and cools the other surface of the

switching circuit portions

12a, 12b, 12c while facing the inner diameter side of the stator 1.

Next, the refrigerant 16 flows around the back surface of the substrate 11 in the circumferential direction, and as shown by the arrows 17 shown in FIGS. 1 and 2, from the relay flow path inlet 19 on the first coil end 8a side formed by the fixing member 7. , It flows into the relay flow path 18 connected to the second coil end 8b side on the opposite side. The relay flow path 18 is a groove formed in an annular shape on the outer peripheral portion of the fixing member 7. As shown by the arrow 22 shown in FIG. 3, the refrigerant 16 flows in the relay flow path 18 in the circumferential direction and heads toward the relay flow path outlet 20.

Next, the refrigerant 16 that has reached the relay flow path outlet 20 flows into the stator cooling flow path 25b as shown by the arrows 21 shown in FIGS. 1 and 3. The stator cooling flow path 25b is a cooling flow path formed by the fixing member 7 and the stator cover 9b, is connected to the relay flow path 18, and guides the refrigerant 16 along the second coil end 8b. The refrigerant 16 flows in the stator cooling flow path 25b in the circumferential direction as shown by the arrow 26 shown in FIG.

Next, the refrigerant 16 is diverted from the stator cooling flow path 25b on the second coil end 8b side of the stator core 6 to the slot by being connected in the axial direction by the slot of the stator core 6, and passes through the slot on the first coil end 8a side. It goes to the stator cooling flow path 25a.

Finally, the refrigerant 16 passes from the stator cooling flow path 25a through the flow path outlet 27, and ends one cycle of circulation of the stator 1. With such a refrigerant flow structure, the coil and the switching circuit section are in direct contact with the refrigerant 16, and the inverter circuit section 10, the motor 40, and their refrigerant flow paths can be compactly housed inside the stator 1. High cooling and miniaturization can be achieved at the same time. Further, the relay flow path 18 shown in the present embodiment can cool the stator core 6 and prevent the heat of the stator 1 from being conducted to the bearing 4, thereby thermally protecting the bearing 4.

Since the first embodiment described is the case of an outer rotor type motor, the rotor 2 is held on the outer peripheral side of the stator 1, and the relay flow path 18 is on the inner peripheral side of the stator core 6. is there.

According to the first embodiment of the present invention described above, the following effects are exhibited.

(1) The motor 40, which is an electric device with a built-in wheel, has a rotor 2 and a stator 1 connected to the wheel. The stator 1 includes a stator core 6, which is a core material in which the winding 8 is wound as a coil, an inverter circuit unit 10 that supplies power to the winding 8, and a bearing 4 that rotationally supports the rotating shaft R of the rotor 2. The fixing member 7 for fixing, the core material 6, the inverter circuit portion, and the stator covers 9a and 9b for integrating the fixing member 7 are provided, and the inverter circuit portion includes the core material 6 in the axial direction of the rotating shaft R. The fixing member and the stator covers 9a and 9b are arranged on the first coil end side 8a of the above, and are connected to the inverter flow path 24 through which the refrigerant flows through the inverter circuit portion and the inverter flow path 24 and are opposite to the first coil end 8a side. A relay flow path 18 connected to the second coil end side 8b on the side and a second coil end side flow path 25b connected to the relay flow path 18 and guiding the refrigerant to the first coil end side 8a are formed. Since this is done, it is possible to achieve both improvement in cooling performance and miniaturization of the electric device with a built-in wheel.

(2) The inverter circuit section of the electric device with a built-in wheel has a switching circuit section composed of semiconductor elements, and the coil and the switching circuit section are in direct contact with the refrigerant. Since this is done, the motor 40 can be cooled efficiently.

(3) The stator covers 9a and 9b of the electric device with a built-in wheel have a first cover 9a arranged on the opening side of the wheel and a second cover 9b arranged on the back side of the wheel. The cover 9a and the second cover 9b are respectively joined to a part of the fixing member 7 and come into contact with the refrigerant. Since this is done, the entire stator 1 can be cooled to every corner.

(4) The rotor 2 of the electric device with a built-in wheel is held on the outer peripheral side of the stator 1, and the relay flow path 18 is on the inner peripheral side of the core material 6. Therefore, in the case of the outer type rotor, the core material 6 and the inverter circuit portion can be separated by the refrigerant, and both can be efficiently cooled.

(Second embodiment)
A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing the configuration of the electric device with a built-in wheel according to the second embodiment of the present invention.

The motor 40A, which is an electric device with a built-in wheel according to the second embodiment of the present invention, is composed of a stator 1A and a rotor 2. The stator 1A has a structure in which a vehicle outer flange 29 and a vehicle body side flange 30 are provided on the stator covers 9a and 9b of the first embodiment of the present invention. In this case, the stator covers 9a and 9b are divided into an outer peripheral cylindrical portion and a side disk portion, and the vehicle outer flange 29 and the vehicle body side flange 30 are for connecting these two portions.

The vehicle body side flange 30 is formed as a first connection portion whose flange surface projects outward from the outer peripheral cylindrical surface of the stator of the stator cover 9a which is the first cover. Further, the vehicle outer flange 29 is formed as a second connecting portion provided on the inner side of the outer peripheral cylindrical surface of the stator cover 9b whose flange surface is the second cover.

According to the second embodiment of the present invention described above, the following effects are exhibited.

(5) The first cover 9a of the electric device with a built-in wheel has a first connecting portion provided so as to project outward from the outer peripheral cylindrical surface of the stator 1A, and the second cover is provided inside the outer peripheral cylindrical surface. It has two connections. Therefore, when the motor 40 is an outer rotor type, the stator 1 can be inserted on the inner diameter side of the rotor 2 without interfering with the vehicle outer flange 29. Further, when the inverter circuit portion 10 is housed in the stator cover 9a, the flange 30 on the vehicle body side and the substrate 11 of the inverter circuit portion 10 do not interfere with each other. As a result, the assembleability of the outer rotor type motor in which the inverter circuit unit 10 is housed in the stator cover can be improved.

(Third Embodiment)
A third embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing the configuration of the electric device with a built-in wheel according to the third embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line AA of FIG.

The motor 40B, which is an electric device with a built-in wheel according to the third embodiment of the present invention, is composed of a stator 1B and a rotor 2. The stator 1B is provided with a plurality of substrate support portions 31 for supporting the substrate 11 of the inverter circuit portion 10 in the circumferential direction in the fixing member 7 of the first embodiment of the present invention. As shown in FIGS. 5 and 6, the substrate 11 is fixed to the substrate support portion 31 by the

substrate fixing bolts

32a, 32b, 32c, and 32d.

As shown in FIG. 5, the substrate support portion 31 projects from the inner diameter side of the relay flow path 18 and is provided as a circuit support portion that supports the inverter circuit portion 10, whereby the inverter circuit portion 10 is provided. It is divided into a first circuit section and a second circuit section in the radial direction of the rotation axis R. The second circuit portion is arranged on the inner peripheral side of the substrate support portion 31b. With this structure, the heat from the stator core 6 is cooled and removed by the relay flow path 18, so that the heat is less likely to be transferred to the second circuit portion on the substrate 11.

Further, in the substrate 11, a first circuit portion in which components having relatively high heat resistance are arranged is provided on the outer peripheral side of the substrate support portion 31b, and low heat resistance such as a capacitor is provided on the inner peripheral side of the substrate support portion 31b. A second circuit unit in which the component 35 is arranged is provided. As a result, the low heat resistant component 35 is protected from heat.

According to the third embodiment of the present invention described above, the following effects are exhibited.

(6) The fixing member 7 of the electric device with a built-in wheel has a circuit support portion 31 that protrudes from the inner diameter side of the relay flow path 18 toward the inverter circuit portion 10 and supports the inverter circuit portion 10, and has an inverter circuit portion. Reference numeral 10 denotes a first circuit portion arranged on the outer peripheral side of the circuit support portion 31, and a second circuit portion arranged on the inner peripheral side of the circuit support portion 31. Since this is done, parts having high heat resistance and parts having low heat resistance can be arranged separately.

(7) In the second circuit portion of the electric device with a built-in wheel, a low heat resistance component 35 having a lower heat resistance than the component arranged in the first circuit portion is arranged. Since this is done, the low heat resistant component 35 such as a capacitor can be protected from heat.

(Fourth Embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. 7 is a cross-sectional view showing the configuration of the electric device with a built-in wheel according to the fourth embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along the line AA of FIG.

The motor 40C, which is an electric device with a built-in wheel according to the fourth embodiment of the present invention, is composed of a stator 1C and a rotor 2. The stator 1C serves as a first circuit support portion for the fixing member 7 of the first embodiment of the present invention, which projects from the inner diameter side of the relay flow path 18 to the inverter circuit portion 10 and supports the substrate 11 of the inverter circuit portion 10. , The annular substrate support portion 33 is provided. Further, as a second circuit support portion protruding from the first cover 9a, an annular support member 34 is inserted between the substrate 11 and the stator cover 9a on the vehicle body side, and the substrate 11 and the annular support member are inserted by the substrate fixing bolt 32. 34 is fixed to the annular substrate support portion 33.

The substrate 11 has a structure having a sandwiched portion sandwiched between the annular substrate support portion 33 and the annular support member 34, and the inverter circuit portion 10 is provided on the outer peripheral side of the sandwiched portion by this structure. It can be divided into a portion and a second electric circuit portion provided on the inner peripheral side of the sandwiched portion. As a result, since the second electric circuit section has a lower heat resistance than the first electric circuit section, the low heat-resistant component accommodating space 36 accommodating the low heat-resistant component 35 and the inverter circuit cooling flow path 24 are completely separated. Can be isolated. Further, when the low heat resistant component 35 does not have resistance to the cooling refrigerant (for example, oil resistance when the refrigerant is oil), the low heat resistant component 35 is prevented from being exposed to the cooling refrigerant, for example, only the second electric circuit portion. Can be air cooled.

According to the fourth embodiment of the present invention described above, the following effects are exhibited.

(8) The fixing member 7 of the electric device with a built-in wheel has a first circuit support portion 33 that projects toward the inverter circuit portion 10 and supports the inverter circuit portion 10 on the inner peripheral side of the relay flow path 18. The first cover 9a has a second circuit support portion 34 that is arranged to face the first circuit support portion 33 and projects toward the inverter circuit portion 10 in the direction opposite to the first circuit support portion 33, and is an inverter. The circuit unit 10 has a pinched portion sandwiched between the first circuit support portion 33 and the second circuit support portion 34, and the pinched portion has an inverter circuit portion 10 provided on the outer peripheral side of the pinched portion. It has one electric circuit part and a second electric circuit part provided on the inner peripheral side of the sandwiched part, and the second electric circuit part has a lower heat resistance than the first electric circuit part. Since this is done, the second electric circuit section can be completely isolated from the first electric circuit section, and low heat resistant parts can be arranged in the second electric circuit section.

(9) The second electric circuit portion of the electric device with a built-in wheel is air-cooled. Since this is done, components that are not resistant to the cooling refrigerant can be arranged in the second electric circuit section.

(Fifth Embodiment)
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a perspective view of the core material 6D according to the fifth embodiment of the present invention.

The core material 6D is the outer peripheral side of the stator core 6 in the first embodiment of the present invention, and the stator covers 9a and 9b, which are the first cover and the second cover, have a cylindrical portion on the outer peripheral side formed by a cylindrical cover member. The axial direction is formed by the bracket member made of metal. A separate resin material 37 formed by a transfer mold is used for the cylindrical cover member. By applying such a mold, the outer peripheral portion of the stator 1 facing the rotor 2 is not exposed to a strong alternating magnetic field, and eddy current loss due to the use of a metal member at this location does not occur. As a result, problems such as an increase in temperature and a decrease in efficiency can be avoided.

According to the fifth embodiment of the present invention described above, the following effects are exhibited.

(10) The first cover 9a and the second cover 9b of the electric device with a built-in wheel are a cylindrical cover member forming an outer peripheral cylindrical portion arranged along the outer peripheral surface of the core material and a cylindrical cover member forming the outer peripheral cylindrical portion. , A metal bracket member arranged along the axial end face of the core material, and a cylindrical cover member is a resin material 37. Since this is done, loss of eddy current does not occur, so that it is possible to avoid an increase in temperature and a decrease in efficiency of the motor 40.

(Sixth Embodiment)
A sixth embodiment of the present invention will be described with reference to FIGS. 10 to 12. 10 is a cross-sectional view showing the configuration of the electric device with a built-in wheel according to the sixth embodiment, and FIGS. 11 and 12 are a cross-sectional view taken along the line AA and a cross-sectional view taken along the line BB of FIG. 10, respectively.

The motor 40E, which is an electric device with a built-in wheel according to a sixth embodiment of the present invention, is an inner rotor type motor which is another type of the first embodiment which is an outer rotor type.

The motor 40E is composed of a stator 1E and a rotor 2E. A rotor 2E is arranged on the inner peripheral side of the stator 1E via an air gap 3, and the rotor 2E is rotatably supported by a bearing 4E. Further, the stator core 6 is held by the stator frame 28 by a method such as shrink fitting.

Since the radial position of the relay flow path inlet 19 is different,

spacers

14d, 14e, 14f are provided instead of the spacer 14c to guide the refrigerant 16 to the relay flow path inlet 19.

In this embodiment, the flow flows from the outer peripheral side of the stator cooling flow path 25b. Therefore, the rotor 2 is held on the inner peripheral side of the motor 40, and the relay flow path 18E has a structure on the outer peripheral side of the core material 6. As a result, even when the motor is an inner rotor type, the inverter circuit unit 10, the core material 6, and their refrigerant flow paths can be compactly housed inside the case of the stator 1, and the motor 40 can be highly cooled and downsized. Can be achieved at the same time.

According to the sixth embodiment of the present invention described above, the following effects are exhibited.

(11) The rotor 2E of the electric device E with a built-in wheel is held on the inner peripheral side of the motor 40E, and the relay flow path 18E is on the outer peripheral side of the core material 6. Therefore, even in the case of the inner rotor type motor 40E, it is possible to realize a refrigerant distribution structure capable of circulating in the stator 1E.

As described above, each embodiment and various modifications are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. At the same time, various embodiments and modifications have been described above, but the present invention is not limited to these contents. Other aspects conceivable within the scope of the technical idea of the present invention are also included within the scope of the present invention.

1,1A, 1B, 1C,

1E Stator

2, 2E Rotor 3

Air gap

4,

4E Bearing

5,

5E Permanent magnet

6, 6D Stator core (core material)
7,7B, 7C Fixing member 8 Winding 8a 1st coil end 8b

2nd coil end

9a, 9b Refrigerant cover 10 Inverter circuit part 11

Substrate

12a, 12b, 12c Switching circuit part 13

Flow path inlet

14a, 14b, 14c, 14d , 14e, 14f

Spacers

15a, 15b, 15c Substrate openings 16 Refrigerant 16a, 16b, 16c Refrigerant flow 17 Refrigerant flow flowing into the relay

flow path inlet

18, 18E Relay flow path 19 Relay flow path inlet 20 Relay flow path Outlet 21 Refrigerant flow flowing out from the relay flow path outlet 22 Refrigerant flow in the relay flow path 23 Partition 24 Inverter circuit section

cooling flow path

25a, 25b Stator cooling flow path 26 Refrigerant flow in the stator cooling flow path 25b 27 flow Road outlet 28 Stator frame 29 Car outer flange 30 Body side flanges 31, 31b

Board support parts

32a, 32b, 32c, 32d Board fixing bolt 33 Ring board support part 34 Ring support member 35 Low heat resistant parts (capacitors)
36 Low heat resistant parts storage space 37 Resin material 40 Motor R Rotating shaft

Claims

An electric device with a built-in wheel having a rotor and a stator connected to the wheel.
The stator is
The core material around which the coil is wound and
The inverter circuit unit that supplies power to the coil and
A fixing member for fixing a bearing that rotationally supports the rotating shaft of the rotor, and
A stator cover for integrating the core material, the inverter circuit portion, and the fixing member is provided.
The inverter circuit unit is arranged on the first coil end side of the core material in the axial direction of the rotating shaft.
The fixing member and the stator cover are connected to an inverter flow path through which a refrigerant flows through the inverter circuit portion and a second coil end side of the core material opposite to the first coil end side. An electric device with a built-in wheel that forms a relay flow path that is connected to the relay flow path and a flow path on the second coil end side that is connected to the relay flow path and guides the refrigerant along the second coil end.
In the electric device with a built-in wheel according to claim 1,
The inverter circuit unit has a switching circuit unit composed of semiconductor elements, and has a switching circuit unit.
The coil and the switching circuit unit are electric devices with built-in wheels that are in direct contact with the refrigerant.
In the electric device with a built-in wheel according to claim 2.
The stator cover has a first cover arranged on the opening side of the wheel and a second cover arranged on the back side of the wheel.
A wheel built-in electric device in which the first cover and the second cover are each joined to a part of the fixing member and come into contact with the refrigerant.
In the electric device with a built-in wheel according to claim 3.
The rotor is held on the outer peripheral side of the stator and is held.
The relay flow path is an electric device with a built-in wheel located on the inner peripheral side of the core material.
In the electric device with a built-in wheel according to claim 4.
The first cover has a first connection portion provided so as to project outward from the outer peripheral cylindrical surface of the stator.
The second cover is an electric device with a built-in wheel having a second connection portion provided inside the outer peripheral cylindrical surface.
In the electric device with a built-in wheel according to claim 4.
The fixing member has a circuit support portion that projects toward the inverter circuit portion on the inner peripheral side of the relay flow path and supports the inverter circuit portion.
The inverter circuit unit is an electric device with a built-in wheel having a first circuit unit arranged on the outer peripheral side of the circuit support unit and a second circuit unit arranged on the inner peripheral side of the circuit support unit.
In the electric device with a built-in wheel according to claim 6.
An electric device with a built-in wheel in which low heat-resistant parts having lower heat resistance than the parts arranged in the first circuit part are arranged in the second circuit unit.
In the electric device with a built-in wheel according to claim 4.
The fixing member has a first circuit support portion that projects toward the inverter circuit portion on the inner peripheral side of the relay flow path and supports the inverter circuit portion.
The first cover has a second circuit support portion that is arranged to face the first circuit support portion and projects toward the inverter circuit portion in the direction opposite to the first circuit support portion.
The inverter circuit portion has a held portion sandwiched between the first circuit support portion and the second circuit support portion.
The sandwiched portion includes the inverter circuit portion, a first electric circuit portion provided on the outer peripheral side of the sandwiched portion, and a second electric circuit portion provided on the inner peripheral side of the sandwiched portion.
The second electric circuit section is an electric device with a built-in wheel that has lower heat resistance than the first electric circuit section.
In the electric device with a built-in wheel according to claim 8.
The second electric circuit unit is an electric device with a built-in wheel that is air-cooled.
In the electric device with a built-in wheel according to claim 4.
The first cover and the second cover are a cylindrical cover member forming an outer peripheral cylindrical portion arranged along the outer peripheral surface of the core material, and a metal arranged along the axial end surface of the core material. Each has a bracket member made of
The cylindrical cover member is an electric device with a built-in wheel, which is a resin material.
In the electric device with a built-in wheel according to claim 3.
The rotor is held on the inner peripheral side of the stator.
The relay flow path is an electric device with a built-in wheel located on the outer peripheral side of the core material.