Motor device, compressor, refrigeration device

Abstract

The stator (60) is housed in the housing (20). The rotor (70) is provided at the inner periphery of the stator (60). The shaft (50) is provided at the inner periphery of the rotor (70). The functional portion (11) is provided at the outer periphery of the first member which is the stator (60) or the shaft (50). The heat-resistant portion (12) is provided between the second member which is the housing (20) or the rotor (70) and the functional portion (11).

Description

Technical Field

[0001] This disclosure relates to an electric motor device, a compressor, and a refrigeration device. Background Technology

[0002] Patent Document 1 discloses a compressor in which the electric motor and the compression mechanism are housed together in a container. In this compressor, a non-conductive material is placed between the stator of the electric motor and the container to prevent the stator and container from coming into contact.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 2001-289173 Summary of the Invention

[0006] -The technical problem the invention aims to solve-

[0007] However, in the device of Patent Document 1, it is impossible to protect the functional parts (which are non-conductive materials in Patent Document 1) from adverse effects caused by heat.

[0008] - Technical solutions used to solve technical problems -

[0009] The first aspect of this disclosure relates to an electric motor device including a housing 20, a stator 60, a rotor 70, a shaft 50, a functional part 11, and a heat-resistant part 12. The stator 60 is housed within the housing 20, the rotor 70 is disposed on the inner periphery of the stator 60, the shaft 50 is disposed on the inner periphery of the rotor 70, and the functional part 11 is disposed on the outer periphery of a first component, which is either the stator 60 or the shaft 50. The heat-resistant part 12 is disposed between a second component and the functional part 11, which is either the housing 20 or the rotor 70.

[0010] In the first aspect, by providing a heat-resistant portion 12 between the second component and the functional portion 11, the functional portion 11 can be protected from adverse effects caused by heat.

[0011] The electric motor device of the second aspect of this disclosure, based on the first aspect, wherein the functional part 11 has at least one of the functions of insulating the first component from the second component and suppressing the transmission of vibration between the first component and the second component.

[0012] In the second aspect, at least one of the following can be achieved: insulation between the first component and the second component, and suppression of vibration transmission between the first component and the second component.

[0013] The electric motor device of the third aspect of this disclosure, based on the first or second aspect, achieves a tight fit between the first component, the functional part 11, and the heat-resistant part 12 by thermally fitting the second component, wherein the melting point or decomposition temperature of the heat-resistant part 12 is higher than the thermal fitting temperature.

[0014] In the third aspect, by making the melting point or decomposition temperature of the heat-resistant part 12 higher than the heat-fitting temperature, it is possible to suppress the deterioration of the heat-resistant part 12 caused by heat during heat-fitting.

[0015] Based on any one of the first to third aspects, the heat-resistant part 12 of the electric motor device of the fourth aspect of this disclosure has the function of hindering heat transfer between the second component and the functional part 11.

[0016] In the fourth aspect, it is able to impede heat transfer between the second component and the functional part 11.

[0017] The fifth aspect of the electric motor device of this disclosure, based on the fourth aspect, wherein the heat-resistant part 12 is configured to: prevent the heat applied to the heat-resistant part 12 during the manufacturing process from being transferred from the heat-resistant part 12 to the functional part 11, thereby preventing the holding force for holding the functional part 11 between the first component and the heat-resistant part 12 from decreasing due to the heat, thereby maintaining the functional part 11 in a state between the first component and the heat-resistant part 12.

[0018] In the fifth aspect, it is able to protect the functional part 11 from the effects of heat applied to the heat-resistant part 12 during the manufacturing process.

[0019] The electric motor device of the sixth aspect of this disclosure, based on the fifth aspect, achieves a thermal fit between the first component, the functional part 11, and the heat-resistant part 12, thereby fastening them together. The melting point or decomposition temperature of the functional part 11 is lower than that of the heat-resistant part 12. The heat-resistant part 12 is configured such that the temperature of the functional part 11 during thermal fit is below the melting point or decomposition temperature of the functional part 11.

[0020] In the sixth aspect, it is able to protect the functional part 11 from the effects of heat applied to the heat-resistant part 12 during thermal fitting.

[0021] The seventh aspect of the electric motor device disclosed herein, based on the fifth aspect, wherein the heat-resistant part 12 is joined to the second part by welding while the first part and the functional part 11 are in close contact and the functional part 11 and the heat-resistant part 12 are in close contact, wherein the heat-resistant part 12 is configured to prevent the heat applied to the heat-resistant part 12 during the welding from being transferred from the heat-resistant part 12 to the functional part 11, thereby preventing the holding force from decreasing due to the heat, thereby maintaining the functional part 11 in a state between the first part and the heat-resistant part 12.

[0022] In the seventh aspect, it is able to protect the functional part 11 from the effects of heat applied to the heat-resistant part 12 during welding.

[0023] Based on any one of the first to seventh aspects, the heat-resistant part 12 of the electric motor device of the eighth aspect of this disclosure has the function of mitigating stress concentration applied to the functional part 11 from the second component.

[0024] In the eighth aspect, it is possible to mitigate the stress concentration applied to the functional part 11 from the second component.

[0025] The electric motor device of the ninth aspect of this disclosure is based on the eighth aspect, wherein the surface roughness of the surface of the heat-resistant part 12 that contacts the functional part 11 is smaller than the surface roughness of the inner peripheral surface of the second component.

[0026] In the ninth aspect, the heat-resistant part 12 is capable of mitigating stress concentration applied from the second component to the functional part 11.

[0027] The electric motor device of the tenth aspect of this disclosure, based on the eighth or ninth aspect, has a smaller profile of the surface of the heat-resistant part 12 that contacts the functional part 11 than the profile of the inner circumferential surface of the second component.

[0028] In the tenth aspect, the heat-resistant part 12 is capable of mitigating stress concentration applied from the second component to the functional part 11.

[0029] Based on any one of the eighth to tenth aspects, the surface hardness of the surface of the heat-resistant part 12 that contacts the functional part 11 is softer than the surface hardness of the inner peripheral surface of the second component in the eleventh aspect of the present disclosure of the electric motor device.

[0030] In the eleventh aspect, the heat-resistant part 12 is capable of mitigating stress concentration applied from the second component to the functional part 11.

[0031] Based on any one of the first to eleventh aspects of the electric motor device of the twelfth aspect of this disclosure, the heat-resistant part 12 is configured to impede axial movement of one of the first and second components relative to the other.

[0032] In the twelfth aspect, it is possible to prevent one of the first and second components from moving axially relative to the other.

[0033] Based on any one of the first to eleventh aspects of the electric motor device of the thirteenth aspect of this disclosure, the heat-resistant part 12 is configured to prevent one of the first component and the second component from rotating relative to the other.

[0034] In the thirteenth aspect, it is possible to prevent one of the first and second components from rotating relative to the other.

[0035] The fourteenth aspect of this disclosure relates to a compressor comprising an electric motor device according to any one of the first to thirteenth aspects.

[0036] The fifteenth aspect of this disclosure relates to a refrigeration apparatus, which includes the compressor of the fourteenth aspect. Attached Figure Description

[0037] Figure 1 This is a longitudinal sectional view illustrating the electric motor device of the first embodiment;

[0038] Figure 2 This is a cross-sectional view illustrating the electric motor device of the first embodiment;

[0039] Figure 3 This is a longitudinal sectional view illustrating the main parts of the electric motor device of Modified Example 1 of the first embodiment;

[0040] Figure 4 This is a cross-sectional view illustrating the main parts of the electric motor device of Modified Example 2 of the first embodiment;

[0041] Figure 5 This is a longitudinal sectional view illustrating the main parts of the electric motor device of Modified Example 3 of the first embodiment;

[0042] Figure 6 This is a cross-sectional view illustrating the main parts of the electric motor device of Modification 4 of the first embodiment;

[0043] Figure 7 This is a longitudinal sectional view illustrating the main parts of the electric motor device of Modification 5 of the first embodiment;

[0044] Figure 8 This is a longitudinal sectional view illustrating the main parts of the electric motor device according to the second embodiment;

[0045] Figure 9 This is a cross-sectional view illustrating the main parts of the electric motor device according to the second embodiment;

[0046] Figure 10 This is a longitudinal sectional view illustrating the main parts of the electric motor device of Modified Example 1 of the second embodiment;

[0047] Figure 11 This is a cross-sectional view illustrating the main parts of the electric motor device of Modified Example 2 of the second embodiment;

[0048] Figure 12 This is a diagram illustrating the structure of a refrigeration device. Detailed Implementation

[0049] The embodiments will now be described in detail with reference to the accompanying drawings. It should be noted that identical or equivalent parts in the drawings are labeled with the same symbols and will not be described again.

[0050] (First Implementation)

[0051] Figure 1 and Figure 2 The structure of the electric motor device 10 according to the first embodiment is illustrated. Figure 2 The cross-sectional lines are omitted. The motor unit 10 includes a housing 20 and a motor 30. In this example, the motor unit 10 constitutes a compressor for compressing fluid. The motor unit 10 is located in the refrigerant circuit of the air conditioner to compress the refrigerant. In other words, the compressor includes a compression mechanism 40 and the motor unit 10. It should be noted that the motor unit 10 can also be located in other equipment besides the air conditioner.

[0052] In this example, the motor device 10 includes a housing 20, a motor 30, a compression mechanism 40, and a shaft 50, in addition to the housing 20 and the motor 30. The shaft 50 connects the motor 30 and the compression mechanism 40.

[0053] 〔case〕

[0054] The housing 20 houses the components of the motor assembly 10. In this example, the housing 20 is formed as a cylinder extending vertically and closed at both ends. The inner circumferential surface of the housing 20 is cylindrical. The housing 20 houses the motor 30, the compression mechanism 40, and the shaft 50. The shaft 50 extends vertically. The motor 30 is arranged above the compression mechanism 40.

[0055] In this example, a suction pipe 21 and a discharge pipe 22 are provided on the housing 20. The suction pipe 21 passes through the body of the housing 20 and is connected to the compression mechanism 40. The discharge pipe 22 passes through the upper part of the housing 20 and communicates with the internal space of the housing 20.

[0056] [Electric motor]

[0057] The electric motor 30 drives the shaft 50 to rotate. Because the shaft 50 is driven to rotate, the compression mechanism 40 operates under the rotational drive of the shaft 50. In this example, the electric motor 30 drives the shaft 50 to rotate in only one direction.

[0058] [Compression mechanism]

[0059] The compression mechanism 40 compresses the fluid. In this example, the compression mechanism 40 compresses the refrigerant drawn in through the suction pipe 21 and sprays the compressed refrigerant into the interior space of the housing 20. The refrigerant sprayed into the interior space of the housing 20 is then ejected through the discharge pipe 22. In this example, the compression mechanism 40 is a rotary compression mechanism.

[0060] [Structure of an electric motor]

[0061] The electric motor 30 includes a stator 60 and a rotor 70.

[0062] In the following description, "axial" refers to the direction of the axis of stator 60 (the center of rotation of rotor 70). "Radial" refers to the direction orthogonal to the axis of stator 60. "Circumferential" refers to the direction around the axis of stator 60. "Longitudinal section" refers to a section taken along the axial direction, and "transverse section" refers to a section orthogonal to the axial direction.

[0063] The stator 60 is housed within the housing 20. The rotor 70 is arranged radially inside the stator 60 with a clearance G. In this example, the motor 30 is an interior permanent magnet (IPM) motor.

[0064] (stator)

[0065] The stator 60 has a stator core 61 and a coil 65.

[0066] The stator core 61 has a back yoke 62, teeth 63, and protrusions 64. In this example, six teeth 63 and six protrusions 64 are provided. The stator core 61 is a laminated core. Specifically, the stator core 61 is constructed by axially stacking multiple electromagnetic steel plates, each made of electromagnetic steel plates and formed in an approximately annular shape.

[0067] The back yoke 62 is formed into an approximately cylindrical shape.

[0068] The tooth 63 extends radially inward from the inner circumferential surface of the back yoke 62. In this example, the six teeth 63 are arranged circumferentially at equal intervals (specifically at 60° intervals).

[0069] The protrusion 64 protrudes radially outward from the outer peripheral surface of the back yoke 62. In this example, the outer peripheral surface of the protrusion 64 is an arc surface. The six protrusions 64 are arranged at equal intervals (specifically at 60° intervals) circumferentially.

[0070] The coil 65 is wound on the tooth 63. In this example, the coil 65 is wound on the tooth 63 in a concentrated winding manner.

[0071] (rotor)

[0072] The rotor 70 is disposed on the inner circumference of the stator 60. The rotor 70 has a rotor core 71 and permanent magnets 75. In this example, four permanent magnets 75 are provided.

[0073] The rotor core 71 has slots 72 and shaft holes 73. In this example, four slots 72 are provided, corresponding to four permanent magnets. The rotor core 71 is a laminated core. Specifically, the rotor core 71 is constructed by axially stacking multiple electromagnetic steel plates, each made of electromagnetic steel and formed in an approximately circular shape.

[0074] The slot 72 houses the permanent magnet 75. In this example, the four slots 72 are arranged at equal intervals (specifically at 90° intervals) along the circumference.

[0075] The shaft hole 73 extends axially through the center of the rotor core 71. The shaft 50 is inserted into and fixed in the shaft hole 73. The shaft 50 is located on the inner circumference of the rotor 70.

[0076] Permanent magnets 75 constitute the magnetic poles of rotor 70. In this example, four magnetic poles are formed by housing four permanent magnets 75 in four slots 72. The permanent magnets 75 are sintered magnets.

[0077] [Functional parts and heat-resistant parts]

[0078] The electric motor assembly 10, based on the structure described above, further includes functional sections 11 and heat-resistant sections 12. In this example, six functional sections 11 corresponding to the six protrusions 64 of the stator 60, and six heat-resistant sections 12 corresponding to the six functional sections 11 are provided. The stator 60, functional sections 11, and heat-resistant sections 12 of the electric motor 30 are fastened together by thermal fitting of the housing 20. The manufacturing method of the electric motor assembly 10, including thermal fitting, will be described in detail later.

[0079] [Functional Department]

[0080] Functional part 11 is disposed on the outer periphery of a first component, which is a stator 60 or a shaft 50. In this example, functional part 11 is disposed on the outer periphery of the stator 60. Functional part 11 is in contact with the stator 60. The stator 60 is an example of a first component.

[0081] In this example, the functional part 11 covers the outer peripheral surface of the protrusion 64 of the stator 60. Specifically, the functional part 11 extends axially along the outer peripheral surface of the protrusion 64. The functional part 11 also extends circumferentially along the outer peripheral surface of the protrusion 64. The transverse cross-sectional shape of the functional part 11 is arc-shaped.

[0082] It should be noted that the functional part 11 may be larger or smaller than the protrusion 64. For example, the surface area of ​​the functional part 11 (the area of ​​the part in contact with the protrusion 64) may be larger or smaller than the area of ​​the outer peripheral surface of the protrusion 64.

[0083] The functional unit 11 has at least one of the functions of insulating the stator 60 from the housing 20 and suppressing the transmission of vibration between the stator 60 and the housing 20. With such a structure, at least one of the functions of insulating the stator 60 from the housing 20 and suppressing the transmission of vibration between the stator 60 and the housing 20 can be achieved.

[0084] Hereinafter, the function of insulating the stator 60 from the housing 20 will be referred to as the "first function", and the function of suppressing the transmission of vibration between the stator 60 and the housing 20 will be referred to as the "second function".

[0085] Examples of materials constituting the functional part 11 having the first function include non-conductive materials. Examples of non-conductive materials include resins and ceramics. Examples of resins constituting the functional part 11 having the first function include PPS (polyphenylene sulfide) resin, LCP (liquid crystal polymer) resin, PBT (polybutylene terephthalate) resin, epoxy resin, phenolic resin, etc. Examples of ceramics constituting the functional part 11 having the first function include alumina, glass, zirconium oxide, etc.

[0086] Examples of materials constituting the functional part 11 having the second function include vibration damping materials and vibration-damping materials. Examples of vibration damping materials and vibration-damping materials include resins and rubbers. Examples of resins constituting the functional part 11 having the second function include epoxy resins, polyamide resins, polyurethane resins, silicone resins, and foams of these resins. Examples of rubbers constituting the functional part 11 having the second function include vibration-damping rubbers and synthetic rubbers.

[0087] [Heat-resistant section]

[0088] A heat-resistant portion 12 is disposed between a second component and a functional portion 11, the second component being either a housing 20 or a rotor 70. In this example, the heat-resistant portion 12 is disposed between the housing 20 and the functional portion 11. The heat-resistant portion 12 is in contact with both the housing 20 and the functional portion 11. The heat-resistant portion 12 prevents the housing 20 from contacting the functional portion 11. The housing 20 is an example of a second component. The combination of the stator 60 and the housing 20 is an example of a combination of a first component and a second component.

[0089] In this example, the heat-resistant portion 12 covers the outer peripheral surface of the functional portion 11. Specifically, the heat-resistant portion 12 extends axially along the outer peripheral surface of the functional portion 11. The heat-resistant portion 12 also extends circumferentially along the outer peripheral surface of the functional portion 11. The transverse cross-sectional shape of the heat-resistant portion 12 is arc-shaped. It should be noted that the heat-resistant portion 12 may not cover the entire surface (the entire outer peripheral surface) of the functional portion 11.

[0090] It should be noted that the heat-resistant portion 12 can be larger or smaller than the functional portion 11. For example, the surface area of ​​the heat-resistant portion 12 (the area of ​​the portion in contact with the functional portion 11) can be larger or smaller than the surface area of ​​the functional portion 11. The heat-resistant portion 12 can be larger or smaller than the protrusion 64 of the stator 60.

[0091] In this example, the stator 60, functional part 11, and heat-resistant part 12 are fastened together by heat fitting the housing 20. The temperature at which the heat-resistant part 12 deteriorates due to heat is higher than the heat fitting temperature. The temperature at which the heat-resistant part 12 deteriorates due to heat is the temperature at which the heat-resistant part 12 deforms, melts, decomposes, etc., due to heat. Examples of temperatures at which deformation, melting, decomposition, etc., occur due to heat include melting point and decomposition temperature. In this example, the melting point or decomposition temperature of the heat-resistant part 12 is higher than the heat fitting temperature. With this structure, it is possible to suppress the deterioration of the heat-resistant part 12 caused by heat during heat fitting.

[0092] Examples of materials constituting the heat-resistant part 12 include metals and thermosetting resins. The metal constituting the heat-resistant part 12 preferably has a high melting point. Examples of metals constituting the heat-resistant part 12 include iron and aluminum. It should be noted that iron can be cast iron or carbon steel. The thermosetting resin constituting the heat-resistant part 12 preferably has low thermal conductivity. Examples of thermosetting resins constituting the heat-resistant part 12 include epoxy resins, phenolic resins, unsaturated polyester resins, varnishes, and foams of these substances.

[0093] The heat-resistant part 12 has at least one of the functions of preventing heat transfer between the housing 20 and the functional part 11 and mitigating stress concentration applied from the housing 20 to the functional part 11. Hereinafter, the function of preventing heat transfer between the housing 20 and the functional part 11 will be referred to as the "first protection function", and the function of mitigating stress concentration applied from the housing 20 to the functional part 11 will be referred to as the "second protection function".

[0094] <First protection function>

[0095] The first protective function is achieved by constructing the heat-resistant part 12 as described below.

[0096] The heat-resistant part 12 is configured such that by preventing the heat applied to the heat-resistant part 12 during the manufacturing process from being transferred from the heat-resistant part 12 to the functional part 11, the holding force used to hold the functional part 11 between the stator 60 and the heat-resistant part 12 is prevented from decreasing due to heat, thereby maintaining the functional part 11 in the state between the stator 60 and the heat-resistant part 12.

[0097] This structure protects the functional part 11 from the heat applied to the heat-resistant part 12 during manufacturing. This allows the functional part 11 to remain positioned between the stator 60 and the heat-resistant part 12.

[0098] It should be noted that, as examples of reduced holding force as described above, deformation, melting, and decomposition of the functional part 11 caused by heat can be listed. For example, if the functional part 11 deforms due to heat, the adhesion between the functional part 11 and the heat-resistant part 12 or between the functional part 11 and the stator 60 will decrease, and as a result, the functional part 11 may not be able to remain between the stator 60 and the heat-resistant part 12.

[0099] In this example, the stator 60, functional part 11, and heat-resistant part 12 are fastened together by heat fitting the housing 20. The temperature at which functional part 11 deteriorates due to heat is lower than the temperature at which heat-resistant part 12 deteriorates due to heat. The temperature at which functional part 11 deteriorates due to heat is the temperature at which functional part 11 deforms, melts, or decomposes due to heat. Examples of temperatures at which deformation, melting, or decomposition occurs due to heat include melting point and decomposition temperature. In this example, the melting point or decomposition temperature of functional part 11 is lower than the melting point or decomposition temperature of heat-resistant part 12. The heat-resistant part 12 is configured such that the temperature of functional part 11 during heat fitting is below its melting point or decomposition temperature. It should be noted that the heat-resistant part 12 may also be configured such that, during heat fitting, the temperature of the surface of heat-resistant part 12 in contact with functional part 11 and the temperature of functional part 11 are lower than the temperature of the surface of heat-resistant part 12 in contact with housing 20. The heat-resistant part 12 can also be configured such that, during heat fitting, the temperature of the functional part 11 is lower than the heat fitting temperature.

[0100] This structure protects the functional part 11 from the heat applied to the heat-resistant part 12 during thermal fitting. This allows the functional part 11 to remain positioned between the stator 60 and the heat-resistant part 12.

[0101] With the structure described above, the heat-resistant part 12 can have a first protective function. In this way, heat transfer between the housing 20 and the functional part 11 can be prevented. For example, during thermal fitting, heat transfer between the housing 20 and the functional part 11 can be prevented.

[0102] <Second protection function>

[0103] The second protective function is achieved by making the heat-resistant part 12 into at least one of the following three structures.

[0104] The surface roughness of the surface of the heat-resistant part 12 that contacts the functional part 11 is smaller than the surface roughness of the inner circumferential surface of the housing 20.

[0105] The profile of the surface of the heat-resistant part 12 that contacts the functional part 11 is smaller than the profile of the inner circumferential surface of the housing 20.

[0106] The surface hardness of the surface of the heat-resistant part 12 that contacts the functional part 11 is softer than the surface hardness of the inner circumferential surface of the shell 20.

[0107] With the structure described above, the heat-resistant part 12 can have a second protective function. In this way, the stress concentration applied to the functional part 11 from the housing 20 can be mitigated. For example, during heat fitting, the stress concentration applied to the functional part 11 from the housing 20 can be mitigated.

[0108] [Manufacturing method of electric motor]

[0109] The electric motor device 10 can be manufactured using the following three manufacturing methods.

[0110] Manufacturing Method 1: The functional part 11 and the heat-resistant part 12 are fixed to the protrusion 64 of the stator 60 by insert molding, and then the housing 20 is heat-fitted to the stator 60 on which the functional part 11 and the heat-resistant part 12 are fixed. Specifically, the diameter of the housing 20 is expanded by heating, and the assembly consisting of the stator 60, the functional part 11 and the heat-resistant part 12 is arranged inside the expanded diameter housing 20. Then, the diameter of the housing 20 is contracted by cooling. In this way, the stator 60, the functional part 11 and the heat-resistant part 12 are fastened together by the housing 20.

[0111] Manufacturing method 2: The functional part 11 and the heat-resistant part 12 are manufactured, and the manufactured functional part 11 and the heat-resistant part 12 are arranged on the protrusion 64 of the stator 60. Then, the housing 20 is heat-fitted onto the stator 60 on which the functional part 11 and the heat-resistant part 12 are arranged.

[0112] Manufacturing method 3: The functional part 11 and the heat-resistant part 12 are fixed to the protrusion 64 of the stator 60 using an adhesive, and then the housing 20 is heat-fitted to the stator 60 on which the functional part 11 and the heat-resistant part 12 are fixed.

[0113] [Effects of the first embodiment]

[0114] As described above, in the electric motor device 10 of the first embodiment, by providing a heat-resistant part 12 between the housing 20 and the functional part 11, the functional part 11 can be protected from adverse effects caused by heat.

[0115] It should be noted that when the high-temperature housing 20 comes into direct contact with the functional part 11 during heat fitting, the temperature of the functional part 11 rises sharply, which may cause the functional part 11 to deteriorate. This is one example of the adverse effects caused by heat.

[0116] In the electric motor device 10 of the first embodiment, since the heat-resistant part 12 can be used to prevent heat transfer between the housing 20 and the functional part 11, the temperature rise of the functional part 11 during heat fitting can be suppressed. In this way, the deterioration of the functional part 11 caused by a sharp temperature rise during heat fitting can be suppressed.

[0117] When the housing 20 is in direct contact with the functional part 11 during heat fitting, if heat is released from the housing 20 and the diameter of the housing 20 shrinks, the stress concentration applied to the functional part 11 by the housing 20 may cause the functional part 11 to deteriorate, depending on the conditions of the contact area between the housing 20 and the functional part 11. This is one example of the adverse effects caused by heat.

[0118] In the electric motor device 10 of the first embodiment, since the second protection function of the heat-resistant part 12 can be used to mitigate the stress concentration applied to the functional part 11 from the housing 20 during thermal fitting, the deterioration of the functional part 11 due to stress concentration can be suppressed.

[0119] (Modification 1 of the first embodiment)

[0120] The shapes of the functional part 11 and the heat-resistant part 12 of the electric motor device 10 in the first embodiment variation 1 are different from those of the electric motor device 10 in the first embodiment. The other structures of the electric motor device 10 in the first embodiment variation 1 are the same as those of the electric motor device 10 in the first embodiment.

[0121] [Functional Department]

[0122] like Figure 3 As shown, in the motor device 10 of the first embodiment's variation 1, the two ends of the functional part 11 extend radially inward along the two ends of the protrusion 64 of the stator 60. Figure 3 In this example, the longitudinal cross-sectional shape of the functional part 11 is formed as a U-shape with an opening toward the radially inward side. The two ends (extensions) of the functional part 11 in the axial direction sandwich the protrusion 64 along the axial direction.

[0123] In other words, the functional part 11 has two extensions 11a. The two extensions 11a are respectively provided at both ends of the functional part 11 in the axial direction. The two extensions 11a extend radially inward along the end face of the protrusion 64 of the stator 60 in the axial direction. The two extensions 11a clamp the protrusion 64 of the stator 60 in the axial direction.

[0124] [Heat-resistant section]

[0125] like Figure 3 As shown, in the motor device 10 of the first embodiment's variation 1, the two ends of the heat-resistant portion 12 extend radially inward along the two ends (extensions) of the functional portion 11 in the axial direction. Figure 3 In this example, the longitudinal cross-sectional shape of the heat-resistant part 12 is formed as a U-shape with an opening toward the radially inward side. The two ends (extensions) of the heat-resistant part 12 in the axial direction sandwich the functional part 11 along the axial direction.

[0126] In other words, the heat-resistant part 12 has two extensions 12a. The two extensions 12a are respectively provided at both ends of the heat-resistant part 12 in the axial direction. With the extensions 11a of the functional part 11 sandwiched between the extensions 64 of the stator 60, the two extensions 12a extend radially inward along the end faces of the protrusions 64 of the stator 60. With the extensions 11a of the functional part 11 sandwiched between the extensions 64 of the stator 60, the two extensions 12a axially sandwich the protrusions 64 of the stator 60.

[0127] The heat-resistant part 12 is configured to prevent one of the first and second components from moving axially relative to the other. In this example, the heat-resistant part 12 is configured to prevent the stator 60 from moving axially relative to the housing 20.

[0128] Specifically, the extension 12a of the heat-resistant portion 12 axially supports the protrusion 64 of the stator 60. With this structure, even if the stator 60 is to move axially relative to the housing 20, the extension 11a of the functional portion 11 provided on the outer periphery of the stator 60 is in contact with the extension 12a of the heat-resistant portion 12 provided on the inner periphery of the housing 20, thus preventing the stator 60 from moving axially relative to the housing 20.

[0129] It should be noted that, in addition to the manufacturing methods 1 to 3 described above, the electric motor device 10 of the modified example 1 of the first embodiment can also be manufactured using the manufacturing method 4 described below.

[0130] Manufacturing method 4: A functional part 11 and a heat-resistant part 12 with a longitudinal cross-sectional shape forming a U-shape opening towards the radial inward are manufactured. The functional part 11 and the heat-resistant part 12 are used to clamp the protrusion 64 of the stator 60 along the axial direction. Then, the housing 20 is heat-fitted onto the stator 60 where the protrusion 64 is clamped by the functional part 11 and the heat-resistant part 12.

[0131] [Effects of Modification 1 of the First Embodiment]

[0132] As described above, in the motor device 10 of the first embodiment variation 1, since the two ends of the functional part 11 in the axial direction extend radially inward along the two ends of the protrusion 64 of the stator 60, the functional part 11 is difficult to peel off.

[0133] In a variation of the first embodiment, since the two ends of the heat-resistant portion 12 extend radially inward along the two ends of the functional portion 11 in the axial direction, the heat-resistant portion 12 is difficult to peel off.

[0134] In a variation of the first embodiment, since the stator 60 can be prevented from moving axially relative to the housing 20, it is possible to prevent the stator 60 from moving axially relative to the housing 20. In this way, for example, it is possible to prevent the stator 60 from falling.

[0135] It should be noted that the above description uses the case where the heat-resistant part 12 has two extensions 12a as an example, but it is not limited to this. For example, the heat-resistant part 12 may have only one of the two extensions 12a.

[0136] When the force acting on the stator 60 in the direction from one end of the axial direction to the other end is greater than the force acting on the stator 60 in the direction from the other end of the axial direction to one end, in other words, when the force acting on the stator 60 is intended to move it from one end of the axial direction to the other end, the heat-resistant portion 12 may only have an extension 12a extending radially inward on the other end side of the stator 60 in the axial direction. For example, when the axial direction extends in the vertical direction, in other words, when the shaft 50 extends in the vertical direction, the heat-resistant portion 12 may only have an extension 12a extending radially inward on the lower side of the stator 60 in the vertical direction.

[0137] (Modification 2 of the first embodiment)

[0138] The shapes of the functional part 11 and the heat-resistant part 12 of the electric motor device 10 in Modification 2 of the first embodiment are different from those of the electric motor device 10 of the first embodiment. The other structures of the electric motor device 10 in Modification 2 of the first embodiment are the same as those of the electric motor device 10 of the first embodiment.

[0139] like Figure 4 As shown, in the motor device 10 of the first embodiment's variant 2, the two ends of the functional section 11 in the circumferential direction extend radially inward along the two ends (extensions) of the protrusion 64 of the stator 60 in the circumferential direction. Figure 4 In this example, the transverse cross-sectional shape of the functional part 11 is formed as a U-shape with an opening toward the radially inward side. The two ends (extensions) of the functional part 11 in the circumferential direction sandwich the protrusion 64 in the circumferential direction.

[0140] In other words, the functional part 11 has two extensions 11b. The two extensions 11b are respectively provided at both ends of the functional part 11 in the circumferential direction. The two extensions 11b extend radially inward along the end face of the protrusion 64 of the stator 60 in the circumferential direction. The two extensions 11b circumferentially sandwich the protrusion 64 of the stator 60.

[0141] like Figure 4 As shown, in the motor device 10 of the modified example 2 of the first embodiment, the two ends of the heat-resistant portion 12 in the circumferential direction extend radially inward along the two ends of the functional portion 11 in the circumferential direction. Figure 4 In this example, the heat-resistant portion 12 has a transverse cross-sectional shape that is U-shaped and opens radially inward. The two ends (extensions) of the heat-resistant portion 12 in the circumferential direction sandwich the functional portion 11 in the circumferential direction.

[0142] In other words, the heat-resistant portion 12 has two extensions 12b. The two extensions 12b are respectively provided at both ends of the heat-resistant portion 12 in the circumferential direction. With the extension 11b of the functional portion 11 sandwiched between the extensions 11b of the functional portion 11 and the protrusion 64 of the stator 60, the two extensions 12b extend radially inward along the end face of the protrusion 64 in the circumferential direction. With the extension 11b of the functional portion 11 sandwiched between the extensions 11b of the functional portion 11 and the protrusion 64 of the stator 60, the two extensions 12b circumferentially sandwich the protrusion 64 of the stator 60.

[0143] The heat-resistant part 12 is configured to prevent one of the first and second components from rotating relative to the other. In this example, the heat-resistant part 12 is configured to prevent the stator 60 from rotating relative to the housing 20.

[0144] Specifically, the extension 12b of the heat-resistant portion 12 supports the protrusion 64 of the stator 60 circumferentially. With this structure, even if the stator 60 is to rotate relative to the housing 20, the extension 11b of the functional portion 11 provided on the outer periphery of the stator 60 is in contact with the extension 12b of the heat-resistant portion 12 provided on the inner periphery of the housing 20, thus preventing the stator 60 from rotating relative to the housing 20.

[0145] It should be noted that, in addition to the manufacturing methods 1 to 3 described above, the electric motor device 10 of the modified example 2 of the first embodiment can also be manufactured using the manufacturing method 5 described below.

[0146] Manufacturing method 5: A functional part 11 and a heat-resistant part 12 with a transverse cross-sectional shape that opens towards the radial inward are made. The functional part 11 and the heat-resistant part 12 are used to clamp the protrusion 64 of the stator 60 in the circumferential direction. Then, the housing 20 is heat-fitted onto the stator 60 where the protrusion 64 is clamped by the functional part 11 and the heat-resistant part 12.

[0147] [Effects of Modification 2 of the First Embodiment]

[0148] As described above, in the motor device 10 of the modified example 2 of the first embodiment, since the two ends of the functional part 11 in the circumferential direction extend radially inward along the two ends of the protrusion 64 of the stator 60 in the circumferential direction, the functional part 11 is difficult to peel off.

[0149] In a variation of the first embodiment, since the two ends of the heat-resistant portion 12 extend radially inward along the two ends of the functional portion 11 in the circumferential direction, the heat-resistant portion 12 is difficult to peel off.

[0150] In a variation of the first embodiment, since the rotation of the stator 60 relative to the housing 20 can be prevented, the rotation of the stator 60 relative to the housing 20 can be prevented. In this way, for example, the rotation of the stator 60 can be prevented.

[0151] It should be noted that the above description uses the case where the heat-resistant part 12 has two extensions 12b as an example, but it is not limited to this. For example, the heat-resistant part 12 may also have only one of the two extensions 12b.

[0152] When the force acting on the stator 60 in one circumferential direction is greater than the force acting on the stator 60 in another circumferential direction, the heat-resistant part 12 may also have an extension 12a that extends radially inward only at the downstream end of the extension 11b of the functional part 11 in one circumferential direction. For example, when the rotor 70 is configured to rotate in only one direction, the heat-resistant part 12 may also have an extension 12a that extends radially inward only at the upstream end of the extension 11b of the functional part 11 in the rotation direction of the rotor 70.

[0153] (Modification 3 of the first embodiment)

[0154] The shape of the heat-resistant part 12 of the motor device 10 in Modification 3 of the first embodiment is different from that of the motor device 10 in Modification 1 of the first embodiment. The other structures of the motor device 10 in Modification 3 of the first embodiment are the same as those of the motor device 10 in Modification 1 of the first embodiment.

[0155] like Figure 5 As shown, in the electric motor device 10 of the modified example 3 of the first embodiment, the longitudinal cross-sectional shape of the heat-resistant part 12 is wavy. Figure 5 In this example, the heat-resistant part 12 is a plate-shaped component and is formed in a wavy shape in the axial direction. The heat-resistant part 12 is elastic.

[0156] [Effects of Modification 3 of the First Embodiment]

[0157] As described above, in the motor device 10 of the modified example 3 of the first embodiment, compared with the case where the heat-resistant part 12 and the housing 20 and the functional part 11 are in close contact, by making the longitudinal cross-sectional shape of the heat-resistant part 12 wavy, it is possible to hinder the heat transfer between the housing 20 and the functional part 11.

[0158] In a variation 3 of the first embodiment, since the heat-resistant part 12 is elastic, it can form an elastic support structure. Therefore, vibration transmission between the stator 60 and the housing 20 can be suppressed.

[0159] It should be noted that the heat-resistant part 12 may also be non-elastic.

[0160] (Modification 4 of the first embodiment)

[0161] The shape of the heat-resistant part 12 of the motor device 10 in Modification 4 of the first embodiment is different from that of the motor device 10 in Modification 2 of the first embodiment. The other structures of the motor device 10 in Modification 4 of the first embodiment are the same as those of the motor device 10 in Modification 2 of the first embodiment.

[0162] like Figure 6 As shown, in the electric motor device 10 of the first embodiment's modified example 4, the heat-resistant portion 12 has a wavy cross-sectional shape. Figure 6 In this example, the heat-resistant part 12 is a plate-shaped component and is formed in a wavy shape in the circumferential direction. The heat-resistant part 12 is elastic.

[0163] [Effects of Variation 4 of the First Embodiment]

[0164] As described above, in the motor device 10 of the first embodiment variation 4, compared with the case where the heat-resistant part 12 and the housing 20 and the functional part 11 are in close contact, by making the transverse cross-sectional shape of the heat-resistant part 12 wavy, it is possible to hinder the heat transfer between the housing 20 and the functional part 11.

[0165] In a variation 4 of the first embodiment, since the heat-resistant part 12 is elastic, it can form an elastic support structure. Therefore, vibration transmission between the stator 60 and the housing 20 can be suppressed.

[0166] It should be noted that the heat-resistant part 12 may also be non-elastic.

[0167] (Modification 5 of the first embodiment)

[0168] The shape of the heat-resistant part 12 of the motor device 10 in Modification 5 of the first embodiment is different from that of the motor device 10 in Modification 1 of the first embodiment. The other structures of the motor device 10 in Modification 5 of the first embodiment are the same as those of the motor device 10 in Modification 1 of the first embodiment.

[0169] like Figure 7 As shown, in the electric motor device 10 of the first embodiment, a space 15 (air layer) is formed between the housing 20 and the heat-resistant part 12.

[0170] [Effects of Modification 5 of the First Embodiment]

[0171] As described above, in the motor device 10 of the first embodiment variation 5, since a space 15 (air layer) is formed between the housing 20 and the heat-resistant part 12, heat transfer between the housing 20 and the functional part 11 can be hindered compared to the case where the heat-resistant part 12 and the housing 20 are in close contact.

[0172] It should be noted that in the motor device 10 of the modified example 2 of the first embodiment, a space 15 (air layer) may also be formed between the housing 20 and the heat-resistant part 12.

[0173] (Modification 6 of the first embodiment)

[0174] The manufacturing method of the electric motor device 10 in Modification 6 of the first embodiment is different from that of the electric motor device 10 of the first embodiment. Other structural features of the electric motor device 10 in Modification 6 of the first embodiment are the same as those of the electric motor device 10 of the first embodiment.

[0175] In the electric motor device 10 of the first embodiment, the heat-resistant part 12 is joined to the housing 20 by welding while the stator 60 and the functional part 11 are in close contact and the functional part 11 and the heat-resistant part 12 are in close contact.

[0176] In the electric motor device 10 of the first embodiment of the modified example 6, the heat-resistant part 12 is configured such that by preventing the heat applied to the heat-resistant part 12 during welding from being transferred from the heat-resistant part 12 to the functional part 11, the holding force used to hold the functional part 11 between the stator 60 and the heat-resistant part 12 is prevented from decreasing due to heat, thereby maintaining the state in which the functional part 11 is held between the stator 60 and the heat-resistant part 12.

[0177] [Effects of Variation 6 of the First Embodiment]

[0178] As described above, in the electric motor device 10 of the first embodiment's variation 6, since the heat applied to the heat-resistant part 12 during welding can be prevented from being transferred from the heat-resistant part 12 to the functional part 11, the functional part 11 can be protected from the effects of the heat applied to the heat-resistant part 12 during welding. In this way, the functional part 11 can be maintained in the state between the stator 60 and the heat-resistant part 12.

[0179] (Second Implementation)

[0180] Figure 8 and Figure 9 The structure of the electric motor device 10 according to the second embodiment is illustrated. The functional part 11 and the heat-resistant part 12 of the electric motor device 10 according to the second embodiment are different from those of the electric motor device 10 according to the first embodiment. The other structures of the electric motor device 10 according to the second embodiment are the same as those of the electric motor device 10 according to the first embodiment.

[0181] [Functional Department]

[0182] In the second embodiment, the functional part 11 is disposed on the outer periphery of the shaft 50. The functional part 11 is in contact with the shaft 50. The shaft 50 is an example of the first component.

[0183] In this example, the functional part 11 is formed in a cylindrical shape, covering the opposing surface of the shaft 50, which is the portion of the outer circumferential surface of the shaft 50 that is radially opposite to the inner circumferential surface of the rotor 70. Specifically, the functional part 11 extends axially along the opposing surface of the shaft 50. The functional part 11 also extends circumferentially along the opposing surface of the shaft 50. The transverse cross-sectional shape of the functional part 11 is annular.

[0184] It should be noted that the functional part 11 may be larger or smaller than the opposite surface of the shaft 50. For example, the surface area of ​​the functional part 11 (the area of ​​the part in contact with the opposite surface of the shaft 50) may be larger or smaller than the area of ​​the opposite surface of the shaft 50.

[0185] The functional unit 11 has at least one function: insulating the shaft 50 from the rotor 70 and suppressing the transmission of vibration between the shaft 50 and the rotor 70. With such a structure, at least one of the functions of insulating the shaft 50 from the rotor 70 and suppressing the transmission of vibration between the shaft 50 and the rotor 70 can be achieved.

[0186] [Heat-resistant section]

[0187] In the second embodiment, a heat-resistant portion 12 is disposed between the rotor 70 and the functional portion 11. The heat-resistant portion 12 is in contact with both the rotor 70 and the functional portion 11. The heat-resistant portion 12 prevents the rotor 70 from contacting the functional portion 11. The rotor 70 is an example of a second component. The combination of the shaft 50 and the rotor 70 is an example of a combination of a first component and a second component.

[0188] In this example, the heat-resistant portion 12 is formed in a cylindrical shape and covers the outer peripheral surface of the functional portion 11. Specifically, the heat-resistant portion 12 extends axially along the outer peripheral surface of the functional portion 11. The heat-resistant portion 12 also extends circumferentially along the outer peripheral surface of the functional portion 11. The transverse cross-sectional shape of the heat-resistant portion 12 is annular.

[0189] It should be noted that the heat-resistant part 12 can be larger or smaller than the functional part 11. For example, the surface area of ​​the heat-resistant part 12 (the area of ​​the portion in contact with the functional part 11) can be larger or smaller than the surface area of ​​the functional part 11. The heat-resistant part 12 can be larger or smaller than the inner circumferential surface of the rotor 70.

[0190] In this example, the rotor 70 is heat-fitted together to secure the shaft 50, the functional part 11, and the heat-resistant part 12. The temperature at which the heat-resistant part 12 deteriorates due to heat is higher than the heat-fitting temperature. Specifically, the melting point or decomposition temperature of the heat-resistant part 12 is higher than the heat-fitting temperature. With this structure, heat-induced deterioration of the heat-resistant part 12 during heat-fitting can be suppressed.

[0191] In the second embodiment, the heat-resistant part 12 has at least one of the functions of insulating the shaft 50 from the rotor 70 and suppressing the transmission of vibration between the shaft 50 and the rotor 70. Hereinafter, the function of hindering heat transfer between the rotor 70 and the functional part 11 will be referred to as the "first protection function", and the function of mitigating stress concentration applied from the rotor 70 to the functional part 11 will be referred to as the "second protection function".

[0192] It should be noted that the structure for implementing the first protection function of the second embodiment is the same as the structure for implementing the first protection function of the first embodiment. Specifically, the structure for implementing the first protection function of the second embodiment is equivalent to the structure for implementing the first protection function of the first embodiment by replacing "stator 60" with "shaft 50" and "housing 20" with "rotor 70".

[0193] [Effects of the Second Implementation]

[0194] As described above, in the electric motor device 10 of the second embodiment, by providing a heat-resistant part 12 between the rotor 70 and the functional part 11, the functional part 11 can be protected from adverse effects caused by heat.

[0195] In the electric motor device 10 of the second embodiment, the same effect as that of the electric motor device 10 of the first embodiment can be obtained.

[0196] (Modification 1 of the second embodiment)

[0197] The shapes of the functional part 11 and the heat-resistant part 12 of the electric motor device 10 in the second embodiment variation 1 are different from those of the electric motor device 10 in the second embodiment. The other structures of the electric motor device 10 in the second embodiment variation 1 are the same as those of the electric motor device 10 in the second embodiment.

[0198] [Functional Department]

[0199] like Figure 10 As shown, in the motor device 10 of the modified example 1 of the second embodiment, the axial length of the functional part 11 is shorter than the axial length of the opposing surface of the shaft 50 (the part of the outer peripheral surface of the shaft 50 that is radially opposite to the inner peripheral surface of the rotor 70).

[0200] [Heat-resistant section]

[0201] like Figure 10 As shown, in the motor device 10 of the modified example 1 of the second embodiment, the two ends of the heat-resistant part 12 extend radially inward along the two ends of the functional part 11 in the axial direction and clamp the functional part 11 in the axial direction.

[0202] In other words, the heat-resistant part 12 has two extensions 12c. The two extensions 12c are respectively provided at both ends of the heat-resistant part 12 in the axial direction. The two extensions 12c are each formed in annular shape and extend radially inward along the end face of the functional part 11 in the axial direction. The two extensions 12c sandwich the functional part 11 in the axial direction.

[0203] In this example, the heat-resistant portion 12 is configured to impede axial movement of the rotor 70 relative to the shaft 50. Specifically, the extension 12c of the heat-resistant portion 12 axially sandwiches the functional portion 11. With this structure, even if the rotor 70 is to move axially relative to the shaft 50, the extension 12c of the heat-resistant portion 12 provided on the inner periphery of the rotor 70 contacts the functional portion 11 provided on the outer periphery of the shaft 50, thus impeding axial movement of the rotor 70 relative to the shaft 50.

[0204] [Effects of Modification 1 of the Second Embodiment]

[0205] As described above, in the motor device 10 of the second embodiment, since the rotor 70 can be prevented from moving axially relative to the shaft 50, it is possible to prevent the rotor 70 from moving axially relative to the shaft 50. In this way, for example, it is possible to prevent the rotor 70 from falling.

[0206] It should be noted that the above description uses the case where the extension 12c of the heat-resistant part 12 extends radially inward as an example, but it is not limited to this. For example, the extension 12c of the heat-resistant part 12 may also extend radially outward along the end face of the rotor 70 in the axial direction. In this case, a recess for the extension 12c of the heat-resistant part 12 to fit into may also be provided at the center of the end face of the rotor 70 in the axial direction.

[0207] In the above description, the case where the heat-resistant part 12 has two extensions 12c was used as an example, but it is not limited to this. For example, the heat-resistant part 12 may also have only one of the two extensions 12c.

[0208] When the force acting on the rotor 70 in the direction from one end of the axial direction to the other end is greater than the force acting on the rotor 70 in the direction from the other end of the axial direction to one end, in other words, when the force acting on the rotor 70 is intended to move it from one end of the axial direction to the other end, the heat-resistant part 12 may only have an extension 12c extending radially inward on the other end side of the rotor 70 in the axial direction. For example, when the axial direction extends in the vertical direction, in other words, when the shaft 50 extends in the vertical direction, the heat-resistant part 12 may only have an extension 12c extending radially inward on the lower side of the rotor 70 in the vertical direction.

[0209] In the above description, examples were given of the heat-resistant portion 12 extending radially inward and the heat-resistant portion 12 extending radially outward, but the description is not limited to these cases. For example, the heat-resistant portion 12 may also have two extensions 12c extending radially inward and two extensions 12c extending radially outward.

[0210] The extension 12c of the heat-resistant portion 12 may also include an extension 12c extending radially inward and an extension 12c extending radially outward. In this case, the extension 12c extending radially inward may also be provided on another axial end, different from the axial end provided with the extension 12c extending radially outward.

[0211] When the force acting on the rotor 70 in the direction from one end of the axial direction to the other end is greater than the force acting on the rotor 70 in the direction from the other end of the axial direction to one end—in other words, when the rotor 70 is configured to be subjected to a force intended to move it from one end of the axial direction to the other end—an extension 12c extending radially inward may be provided on the other end side of the axial direction, and an extension 12c extending radially outward may be provided on the one end side of the axial direction. For example, when the axial direction extends vertically, in other words, when the shaft 50 extends vertically, an extension 12c extending radially inward may be provided on the lower side of the vertical direction, and an extension 12c extending radially outward may be provided on the upper side of the vertical direction.

[0212] (Modification 2 of the second embodiment)

[0213] The shape of the heat-resistant part 12 of the motor device 10 in Modification 2 of the second embodiment is different from that of the motor device 10 of the second embodiment. The other structures of the motor device 10 in Modification 2 of the second embodiment are the same as those of the motor device 10 of the second embodiment.

[0214] [Heat-resistant section]

[0215] like Figure 11 As shown, a plurality of protrusions 12d are provided on the heat-resistant portion 12. The plurality of protrusions 12d protrude radially inward from the heat-resistant portion 12 and are embedded in the functional portion 11. In this example, four protrusions 12d are provided on the heat-resistant portion 12 at equal intervals in the circumferential direction.

[0216] In this example, the heat-resistant portion 12 is configured to prevent the rotor 70 from rotating relative to the shaft 50. Specifically, the protrusion 12d of the heat-resistant portion 12 protrudes radially inward and is embedded in the functional portion 11. With this structure, even if the rotor 70 is to rotate relative to the shaft 50, the protrusion 12d of the heat-resistant portion 12 provided on the inner periphery of the rotor 70 is in contact with the functional portion 11 provided on the outer periphery of the shaft 50, thus preventing the rotor 70 from rotating relative to the shaft 50.

[0217] [Effects of Modification 2 of the Second Embodiment]

[0218] As described above, in the motor device 10 of the second embodiment, since the rotor 70 can be prevented from rotating relative to the shaft 50, it is possible to prevent the rotor 70 from rotating relative to the shaft 50. In this way, for example, the rotor 70 can be prevented from rotating.

[0219] It should be noted that the above description uses the case where the heat-resistant part 12 has four protrusions 12d as an example, but it is not limited to this. For example, the heat-resistant part 12 may also have three or fewer protrusions 12d, or it may have five or more protrusions 12d.

[0220] In the above description, the case where the protrusion 12d of the heat-resistant part 12 extends radially inward has been used as an example, but it is not limited to this. For example, the protrusion 12d of the heat-resistant part 12 may also extend radially outward and be embedded in the rotor 70. In this case, a recess for the protrusion 12d of the heat-resistant part 12 to fit into may also be provided on the inner circumferential surface of the rotor 70.

[0221] (Modification 3 of the second embodiment)

[0222] The manufacturing method of the electric motor device 10 in Modification 3 of the second embodiment differs from that of the electric motor device 10 of the second embodiment. Other structural features of the electric motor device 10 in Modification 3 of the second embodiment are the same as those of the electric motor device 10 of the second embodiment.

[0223] In the electric motor device 10 of the second embodiment, the heat-resistant part 12 is joined to the rotor 70 by welding while the shaft 50 and the functional part 11 are in close contact and the functional part 11 and the heat-resistant part 12 are in close contact.

[0224] In the electric motor device 10 of the second embodiment, the heat-resistant part 12 is configured such that by preventing the heat applied to the heat-resistant part 12 during welding from being transferred from the heat-resistant part 12 to the functional part 11, the holding force used to hold the functional part 11 between the shaft 50 and the heat-resistant part 12 is prevented from decreasing due to heat, thereby maintaining the functional part 11 in the state between the shaft 50 and the heat-resistant part 12.

[0225] [Effects of Modification 3 of the Second Embodiment]

[0226] As described above, in the motor device 10 of the second embodiment, variation 3, since it is possible to prevent the heat applied to the heat-resistant part 12 during welding from being transferred from the heat-resistant part 12 to the functional part 11, the functional part 11 can be protected from the effects of the heat applied to the heat-resistant part 12 during welding. In this way, the functional part 11 can be maintained in the state between the shaft 50 and the heat-resistant part 12.

[0227] (Refrigeration unit)

[0228] Figure 12 An example is shown of the structure of a refrigeration unit RR including a compressor CC with an electric motor assembly 10. The refrigeration unit RR has a refrigerant circuit RR1 filled with refrigerant. The refrigerant circuit RR1 includes a compressor CC, a radiator RR5, a pressure reducing mechanism RR6, and an evaporator RR7. In this example, the pressure reducing mechanism RR6 is an expansion valve. The refrigerant circuit RR1 performs a vapor compression refrigeration cycle.

[0229] In the refrigeration cycle, the refrigerant injected from compressor CC dissipates heat in radiator RR5. The refrigerant flowing out of radiator RR5 is depressurized in pressure reducing mechanism RR6 and then evaporates in evaporator RR7. The refrigerant flowing out of evaporator RR7 is drawn into compressor CC.

[0230] In this example, the refrigeration unit RR is an air conditioner. An air conditioner can be a dedicated refrigeration unit or a dedicated heating unit. It can also be an air conditioner that switches between cooling and heating modes. In this case, the air conditioner has a switching mechanism (e.g., a four-way switching valve) to switch the refrigerant circulation direction. The refrigeration unit RR can also be a water heater, a cooling unit, or a cooling device for the air inside a cold storage facility. Cooling devices cool the air inside cold storage rooms, freezers, containers, etc.

[0231] (Other implementation methods)

[0232] In the above description, the case where the stator 60 has a protrusion 64 was used as an example, but it is not limited to this. The stator 60 may also not have a protrusion 64. For example, the outer peripheral surface of the stator 60 may also be a cylindrical surface. The functional part 11 and the heat-resistant part 12 may also be formed on the entire outer peripheral surface of the stator 60.

[0233] The above describes the implementation methods and variations, but it is understood that various changes can be made to the methods and specific situations without departing from the spirit and scope of the claims. The above implementation methods and variations can also be appropriately combined or substituted as long as the function of the object of this disclosure is not affected.

[0234] -Industry Applicability-

[0235] In summary, this disclosure is useful as an electric motor device.

[0236] - Symbol Explanation -

[0237] 10 Electric motor unit

[0238] 11 Functional Departments

[0239] 12 Heat-resistant section

[0240] 20 housing

[0241] 30 electric motors

[0242] 40 compression mechanism

[0243] 50 axis

[0244] 60 stator

[0245] 61 stator core

[0246] 62 back yoke

[0247] 63 teeth

[0248] 64 protrusions

[0249] 70 rotor

[0250] CC compressor

[0251] RR refrigeration unit

Claims

1. A motor device, characterized in that: The electric motor assembly includes a housing (20), a stator (60), a rotor (70), a shaft (50), a functional part (11), and a heat-resistant part (12). The stator (60) is housed within the housing (20). The rotor (70) is disposed on the inner circumference of the stator (60). The shaft (50) is disposed on the inner circumference of the rotor (70). The functional part (11) is disposed on the outer periphery of the first component, which is the stator (60). The heat-resistant part (12) is disposed between the second component and the functional part (11), and the second component is the housing (20). The stator (60) has a back yoke (62) and a protrusion (64) that protrudes radially outward from the outer peripheral surface of the back yoke (62). The functional part (11) has an extension that extends radially inward along the end face of the protrusion (64) in the axial or circumferential direction of the stator (60). The heat-resistant part (12) has an extension that extends radially inward along the end face of the protrusion (64) in the axial or circumferential direction of the stator (60) while the extension of the functional part (11) is sandwiched between the heat-resistant part (12) and the stator (60).

2. The electric motor device according to claim 1, characterized in that: The functional part (11) has at least one of the functions of insulating the first component from the second component and suppressing the transmission of vibration between the first component and the second component.

3. The electric motor device according to claim 1 or 2, characterized in that: By heat-fitting the second component, the first component, the functional part (11), and the heat-resistant part (12) are fastened together. The melting point or decomposition temperature of the heat-resistant part (12) is higher than the heat-fitting temperature.

4. The electric motor device according to claim 1 or 2, characterized in that: The heat-resistant part (12) has the function of preventing heat transfer between the second component and the functional part (11).

5. The electric motor device according to claim 4, characterized in that: The heat-resistant part (12) is configured to prevent the heat applied to the heat-resistant part (12) during the manufacturing process from being transferred from the heat-resistant part (12) to the functional part (11), thereby preventing the holding force for holding the functional part (11) between the first component and the heat-resistant part (12) from being reduced due to the heat, thereby maintaining the functional part (11) between the first component and the heat-resistant part (12).

6. The electric motor device according to claim 5, characterized in that: By heat-fitting the second component, the first component, the functional part (11), and the heat-resistant part (12) are fastened together. The melting point or decomposition temperature of the functional part (11) is lower than that of the heat-resistant part (12). The heat-resistant part (12) is configured such that the temperature of the functional part (11) during heat fitting is below the melting point or decomposition temperature of the functional part (11).

7. The electric motor device according to claim 5, characterized in that: The heat-resistant part (12) is joined to the second part by welding when the first component and the functional part (11) are in close contact and the functional part (11) and the heat-resistant part (12) are in close contact. The heat-resistant part (12) is configured to prevent the heat applied to the heat-resistant part (12) during the welding from being transferred from the heat-resistant part (12) to the functional part (11), thereby preventing the holding force from decreasing due to the heat, and thus maintaining the functional part (11) in a state between the first component and the heat-resistant part (12).

8. The electric motor device according to claim 1 or 2, characterized in that: The heat-resistant part (12) has the function of mitigating the stress concentration applied from the second component to the functional part (11).

9. The electric motor device according to claim 8, characterized in that: The surface roughness of the surface of the heat-resistant part (12) that contacts the functional part (11) is smaller than the surface roughness of the inner circumferential surface of the second component.

10. The electric motor device according to claim 8, characterized in that: The profile of the surface of the heat-resistant part (12) that contacts the functional part (11) is smaller than the profile of the inner circumferential surface of the second component.

11. The electric motor device according to claim 8, characterized in that: The surface hardness of the surface of the heat-resistant part (12) that contacts the functional part (11) is softer than the surface hardness of the inner circumferential surface of the second component.

12. The electric motor device according to claim 1 or 2, characterized in that: The heat-resistant part (12) is configured to prevent one of the first component and the second component from moving axially relative to the other.

13. The electric motor device according to claim 1 or 2, characterized in that: The heat-resistant part (12) is configured to prevent one of the first component and the second component from rotating relative to the other.

14. A compressor, characterized in that: The compressor includes the electric motor device as described in any one of claims 1 to 13.

15. A refrigeration device, characterized in that: The refrigeration device includes the compressor as described in claim 14.

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