US-12627181-B2 - Motor apparatus, compressor, and refrigeration apparatus

US12627181B2US 12627181 B2US12627181 B2US 12627181B2US-12627181-B2

Abstract

A motor apparatus includes a casing, a stator disposed in the casing, a rotor disposed on an inner circumference of the stator, a shaft disposed on an inner circumference of the rotor, a functional part disposed on an outer circumference of a first member, and a heat-resistant part disposed between the functional part and a second member. The first member is the stator or the shaft. The second member is the casing or the rotor.

Inventors

Daisuke Hiratsuka
Hiroshi Hibino

Assignees

DAIKIN INDUSTRIES, LTD.

Dates

Publication Date: 20260512
Application Date: 20230327
Priority Date: 20200929

Claims (17)

1 . A motor apparatus comprising: a casing; a stator disposed in the casing, the stator including a protruding section protruding radially outward from an outer circumference of the stator, the protruding section including a radially outward-facing surface and a circumferentially facing surface; a rotor disposed on an inner circumference of the stator; a shaft disposed on an inner circumference of the rotor; a functional part disposed on the outer circumference of the stator; and a heat-resistant part disposed between the functional part and the casing, wherein the functional part includes an extension section that extends inward in a radial direction along the circumferentially facing surface of the protruding section, the heat-resistant part includes an extension section that extends inward in the radial direction along the circumferentially facing surface of the protruding section such that the extension section of the functional part is sandwiched between the stator and the extension section of the heat-resistant part.
2 . The motor apparatus according to claim 1 , wherein the functional part at least one of insulates the stator and the casing from each other and suppresses transmission of vibration between the stator and the casing.
3 . The motor apparatus according to claim 1 , wherein the stator, the functional part, and the heat-resistant part are fastened by shrink-fitting the casing, and a melting point or a decomposition temperature of the heat-resistant part is higher than a temperature during shrink fitting.
4 . The motor apparatus according to claim 1 , wherein the heat-resistant part suppresses heat transmission between the casing and the functional part.
5 . The motor apparatus according to claim 4 , wherein the heat-resistant part is configured to suppress transmission of heat, applied to the heat-resistant part during a manufacturing process, from the heat-resistant part to the functional part, suppress reduction due to the heat in holding force to hold the functional part between the stator and the heat-resistant part, and maintain a state in which the functional part is held between the stator and the heat-resistant part.
6 . The motor apparatus according to claim 5 , wherein the stator, the functional part, and the heat-resistant part are fastened by shrink-fitting the casing, a melting point or a decomposition temperature of the functional part is lower than a melting point or a decomposition temperature of the heat-resistant part, and the heat-resistant part is configured to cause a temperature of the functional part during shrink fitting to be equal to or lower than the melting point or the decomposition temperature of the functional part.
7 . The motor apparatus according to claim 5 , wherein the heat-resistant part is joined to the casing by welding in a state in which the stator and the functional part are in close contact with each other and the functional part and the heat-resistant part are in close contact with each other, and the heat-resistant part is configured to suppress transmission of heat, applied to the heat-resistant part during the welding, from the heat-resistant part to the functional part, suppress reduction due to the heat in the holding force, and maintain the state in which the functional part is held between the stator and the heat-resistant part.
8 . The motor apparatus according to claim 1 , wherein the heat-resistant part relaxes concentration of stress applied from the casing to the functional part.
9 . The motor apparatus according to claim 8 , wherein surface roughness of a surface of the heat-resistant part in contact with the functional part is smaller than surface roughness of an inner circumference surface of the casing.
10 . The motor apparatus according to claim 8 , wherein a profile of a surface of the heat-resistant part in contact with the functional part is lower than a profile of an inner circumference surface of the casing.
11 . The motor apparatus according to claim 8 , wherein surface hardness of a surface of the heat-resistant part in contact with the functional part is smaller than surface hardness of an inner circumference surface of the casing.
12 . The motor apparatus according to claim 1 , wherein the heat-resistant part is configured to hinder movement of one of the stator and the casing with respect to another of the stator and the casing in an axial direction.
13 . The motor apparatus according to claim 1 , wherein the heat-resistant part is configured to hinder rotation of one of the stator and the casing with respect to another of the stator and the casing.
14 . A compressor including the motor apparatus according to claim 1 .
15 . A refrigeration apparatus including the compressor according to claim 14 .
16 . A motor apparatus comprising: a casing; a stator disposed in the casing, the stator including a plurality of protruding sections that protrude radially outward from an outer circumference of the stator; a rotor disposed on an inner circumference of the stator; a shaft disposed on an inner circumference of the rotor; a plurality of functional parts disposed on outer circumferential surfaces of the plurality of protruding sections, respectively; and a plurality of heat-resistant parts disposed between each of the plurality of functional parts, respectively, and the casing.
17 . The motor apparatus according to claim 16 , wherein each of the plurality of functional parts includes an extension section that extends inward in a radial direction along an axial end surface of the stator or along a circumferentially facing surface of a respective protruding section among the plurality of protruding sections, each of the plurality of heat-resistant part includes an extension section that extends inward in the radial direction along the axial end surface or along the circumferentially facing surface of the respective protruding section such that the extension section of each of the plurality of functional parts is sandwiched between the stator and the extension section of a respective heat-resistant parts among the plurality of the heat-resistant parts.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of International Application No. PCT/JP2021/035859 filed on Sep. 29, 2021, which claims priority to Japanese Patent Application No. 2020-163277, filed on Sep. 29, 2020. The entire disclosures of these applications are incorporated by reference herein. BACKGROUND Technical Field The present disclosure relates to a motor apparatus, a compressor, and a refrigeration apparatus. Background Art Japanese Unexamined Patent Application Publication No. 2001-289173 discloses a compressor in which an electric motor is accommodated in a container together with a compression mechanism. In this compressor, a non-conductive material is provided between a stator of the electric motor and the container to prevent contact between the stator and the container. SUMMARY A first aspect of the present disclosure relates to a motor apparatus. The motor apparatus includes a casing, a stator disposed in the casing, a rotor disposed on an inner circumference of the stator, a shaft disposed on an inner circumference of the rotor, a functional part disposed on an outer circumference of a first member, and a heat-resistant part disposed between the functional part and a second member. The first member is the stator or the shaft. The second member is the casing or the rotor. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view illustrating an example of a motor apparatus according to a first embodiment. FIG. 2 is a transverse sectional view illustrating an example of the motor apparatus according to the first embodiment. FIG. 3 is a longitudinal sectional view illustrating an example of a main part of a motor apparatus according to a first modification of the first embodiment. FIG. 4 is a transverse sectional view illustrating an example of a main part of a motor apparatus according to a second modification of the first embodiment. FIG. 5 is a longitudinal sectional view illustrating an example of a main part of a motor apparatus according to a third modification of the first embodiment. FIG. 6 is a transverse sectional view illustrating an example of a main part of a motor apparatus according to a fourth modification of the first embodiment. FIG. 7 is a longitudinal sectional view illustrating an example of a main part of a motor apparatus according to a fifth modification of the first embodiment. FIG. 8 is a longitudinal sectional view illustrating an example of a main part of a motor apparatus according to a second embodiment. FIG. 9 is a transverse sectional view illustrating an example of the main part of the motor apparatus according to the second embodiment. FIG. 10 is a longitudinal sectional view illustrating an example of a main part of a motor apparatus according to a first modification of the second embodiment. FIG. 11 is a transverse sectional view illustrating an example of a main part of a motor apparatus according to a second modification of the second embodiment. FIG. 12 is a diagram of an example of a configuration of a refrigeration apparatus. DETAILED DESCRIPTION OF EMBODIMENT(S) Embodiments will be described below in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. First Embodiment FIG. 1 and FIG. 2 illustrate an example of a configuration of a motor apparatus (10) according to a first embodiment. Hatching is omitted in FIG. 2. The motor apparatus (10) includes a casing (20) and a motor (30). In this example, the motor apparatus (10) forms a compressor that compresses a fluid. The motor apparatus (10) is provided in a refrigerant circuit of an air conditioner to compress a refrigerant. In other words, the compressor includes a compression mechanism (40) and the motor apparatus (10). The motor apparatus (10) may be provided in a device other than the air conditioner. In this example, the motor apparatus (10) includes the compression mechanism (40) and a shaft (50) in addition to the casing (20) and the motor (30). The shaft (50) couples the motor (30) and the compression mechanism (40) to each other. Casing The casing (20) accommodates components of the motor apparatus (10). In this example, the casing (20) is formed in a cylindrical shape extending in the up-down direction and having both ends closed. The inner circumference surface of the casing (20) is a cylindrical surface. The casing (20) accommodates the motor (30), the compression mechanism (40), and the shaft (50). The shaft (50) extends in the up-down direction. The motor (30) is disposed above the compression mechanism (40). In this example, the casing (20) is provided with a suction pipe (21) and a discharge pipe (22). The suction pipe (21) is formed through a body portion of the casing (20) and is coupled to the compression mechanism (40). The discharge pipe (22) is formed through an upper portion of the casing (20) and communicates with an interna