rotary machine

Abstract

The present application aims at improving a cooling structure of a rotary machine. The rotary machine has a resolver that measures a rotation angle of a rotor, a resolver chamber that houses the resolver on one axial side of a shaft, a guide portion that guides refrigerant to the resolver chamber, a frame that houses a stator and the rotor, and a bracket that is disposed on the one axial side of the frame, the shaft has a hollow portion that extends from an opening portion, which is opened on the one axial side, to the other axial side, and a refrigerant oil passage that penetrates the shaft from the hollow portion to the radial outer side, the shaft is axially supported to the bracket via a bearing, the opening portion communicates with the resolver chamber, an end portion of the shaft on the one axial side penetrates the bracket from the other axial side to the one axial side, the resolver chamber is a space on the one axial side of the bracket, an opening on the one axial side of the resolver chamber is plugged by a sensor cover, and the guide portion includes a penetration hole that penetrates the bracket from the other axial side to the one axial side.

Description

Technical Field

[0001] This invention relates to rotary machines. Background Technology

[0002] Previously, rotating machines with cooling structures were known. Patent Document 1 discloses a structure that cools the rotor of an electric motor from the inside via a hollow portion of the rotor shaft, which serves as the rotating shaft of the electric motor. Patent Document 2 discloses a structure having an oil passage provided in the shaft, which serves as the rotating shaft of the rotating electric motor.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-93869

[0006] Patent Document 2: Japanese Patent No. 6355750 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, the oil circuits used to supply oil to the rotor shaft or shaft were complex and required additional piping, which hindered miniaturization. In addition, there was the problem of increased costs due to the addition of components. Therefore, there was room for improvement in the cooling structure of rotating machines in the past.

[0009] The purpose of this invention is to improve the cooling structure of a rotating machine.

[0010] Methods for solving problems

[0011] One aspect of the rotating machine of the present invention is characterized by comprising: a stator; a rotor facing the stator with a gap; a shaft, the shaft being a rotating shaft fixed to the rotor; a rotary transformer, the rotary transformer measuring the rotation angle of the rotor; a rotary transformer chamber housing the rotary transformer on one axial side of the shaft; a guide portion guiding refrigerant to the rotary transformer chamber; a frame housing the stator and the rotor; and a bracket disposed on one axial side of the frame, the shaft having: a hollow portion, the... A hollow portion extends from an opening on one axial side to the other axial side; and a refrigerant oil passage extends radially outward from the hollow portion through the shaft, the shaft being axially supported by the bracket via a bearing, the opening communicating with the rotary transformer chamber, the axial end of the shaft extending from the other axial side through the bracket to the axial side, the rotary transformer chamber being the space on one axial side of the bracket, the opening on one axial side of the rotary transformer chamber being blocked by a sensor cover, and the guide portion including a through hole extending from the other axial side through the bracket to the axial side.

[0012] In one of the aforementioned rotary machines, the guide portion is characterized by comprising a flow path formed by ribs disposed on the bracket.

[0013] In one of the aforementioned rotary machines, the refrigerant flows from the other axial side of the bracket to the other axial side via the bearing and is guided to the rotary transformer chamber.

[0014] Invention Effects

[0015] According to one aspect of the present invention, the cooling structure of the rotating machine can be improved. Attached Figure Description

[0016] Figure 1 This is a side sectional view of the motor 100 according to the first embodiment of the present invention.

[0017] Figure 2 This is a 3D view showing the state of the frame 140 after the motor 100 has been removed.

[0018] Figure 3 This is a side view of bracket 160 viewed from the opposite side of the axial direction. Detailed Implementation

[0019] Hereinafter, the rotating machine according to an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the following drawings, for ease of understanding of each structure, the actual structure and the scale and quantity of each structure may sometimes differ.

[0020] Furthermore, in the accompanying diagram, the XYZ coordinate system is appropriately represented as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Y-axis direction is perpendicular to the x-axis. Figure 1 The direction parallel to the axial direction of the central axis J is shown. The Z-axis direction is radially relative to the central axis J. Figure 1 The X-axis is the vertical direction. The X-axis is orthogonal to both the Y-axis and Z-axis. In any of the X-axis, Y-axis, and Z-axis directions, the side indicated by the arrow in the diagram is designated as the "+" side, and the opposite side is designated as the "-" side.

[0021] In the following explanation, the positive side (+Y side) in the Y-axis direction will be referred to as "one side," and the negative side (-Y side) in the Y-axis direction will be referred to as "the other side." It should be noted that "one side" and "the other side" are merely names used for illustrative purposes and do not limit the actual positional relationship or direction. Furthermore, unless otherwise specified, the direction parallel to the central axis J (Y-axis direction) will be simply referred to as "axial direction," the radial direction centered on the central axis J will be simply referred to as "radial direction," and the circumferential direction centered on the central axis J, i.e., the direction around the central axis J, will be simply referred to as "circumferential direction." The side radially closer to the central axis J will be called "radial inner side," and the side farther from the central axis J will be called "radial outer side." In the circumferential direction, the side rotating clockwise when viewing the -Y side from the +Y side will be called "circumferential one side," and the side rotating counterclockwise will be called "circumferential the other side."

[0022] It should be noted that, in this specification, "extending axially" includes not only the case of extending strictly along the axial direction (Z-axis direction), but also the case of extending in a direction inclined relative to the axial direction within a range of less than 45°. Furthermore, in this specification, "extending radially" includes not only the case of extending strictly in the radial direction, i.e., in a direction perpendicular to the axial direction (Z-axis direction), but also the case of extending in a direction inclined relative to the radial direction within a range of less than 45°. Additionally, "parallel" includes not only the case of being strictly parallel, but also the case of the angle between them being inclined within a range of less than 45°. Furthermore, "extending in a direction orthogonal to the axial direction" includes not only the case of extending strictly in a direction orthogonal to the axial direction (Z-axis direction), but also the case of extending in a direction inclined within a range of less than 45° relative to the direction orthogonal to the axial direction (Z-axis direction).

[0023] <First Implementation Method>

[0024] Figure 1This is a perspective view of an electric motor according to a first embodiment of the present invention. The electric motor 100 is an example of a rotary machine. The electric motor 100 has a rotor 110 and a stator 120 disposed radially outward of the rotor 110 with a gap. The electric motor 100 has a frame 140 for housing the rotor 110 and the stator 120, and brackets 150 and 160 disposed at both axial ends of the frame 140. The frame 140 is generally cylindrical in shape, and the bracket 150 is configured to block an opening on the other axial side of the frame 140, and the bracket 160 is configured to block an opening on one axial side of the frame 140.

[0025] The motor 100 has a shaft 130 that serves as a rotating shaft fixed to the rotor 110. The shaft 130 is arranged along the central axis J. The motor 100 has bearings 171 and 172 that rotatably support the shaft 130. The outer ring of bearing 171 is fixed to a bracket 150, and the inner ring is fixed to the shaft 130, thereby providing shaft support for the shaft 130 at a position axially opposite to that of the rotor 110. The outer ring of bearing 172 is fixed to a bracket 160, and the inner ring is fixed to the shaft 130, thereby providing shaft support for the shaft 130 at a position axially opposite to that of the rotor 110.

[0026] Shaft 130 has a hollow portion 130a extending from one axial end to the other axially. Additionally, shaft 130 has a hollow portion 130b extending from one axially polygonal end of hollow portion 130a to the other axially. The diameter of hollow portion 130b is larger than the diameter of hollow portion 130a. The axially polygonal end of hollow portion 130b is not open axially. One axial end of hollow portion 130a is open axially at an opening 130aa. Shaft 130 has a refrigerant oil passage 130ba penetrating shaft 130 radially outward from hollow portion 130b.

[0027] The bracket 160 has: a base 160a, which is located on one side of the shaft 130 and extends radially inward; and a protrusion 160b, which protrudes from the base 160a to the other side of the shaft and extends radially inward. The protrusion 160b has a through hole 160g extending axially. The shaft 130 passes through the through hole 160g. The bracket 160 has a space, namely a rotary transformer chamber 306, for accommodating the rotary transformer 301 on one side of the base 160a and the through hole 160g. The opening on one side of the axial direction of the rotary transformer chamber 306 is blocked by a flat sensor cover 305.

[0028] The motor 100 includes a rotary transformer 301 for measuring the rotation angle of the rotor 110. The rotary transformer 301 includes a rotary transformer stator 302, a rotary transformer rotor 303 disposed radially inside the rotary transformer stator 302, and a rotary transformer fixing portion 304 for fixing the rotary transformer stator 302 to a protrusion 160b of a bracket 160. The rotary transformer rotor 303 is fixed to a shaft 130, and rotates along with the rotation of the shaft 130. The rotary transformer fixing portion 304 has a through hole extending axially at a position where at least a portion radially overlaps with an opening 130aa on one axial side of the hollow portion 130a. Thus, the rotary transformer chamber 306 communicates with the hollow portion 130b of the shaft 130.

[0029] The motor 100 has a piping 201 and a piping 202 (see reference) for supplying cooling oil (hereinafter referred to as "refrigerant") from outside the motor 100. Figure 2 ). Figure 2 This is a perspective view showing the state after the frame 140 has been removed from the motor 100. The motor 100 is configured with its axial direction orthogonal to the vertical direction, and the pipes 201 and 202 are configured parallel to the axial direction and positioned vertically above the shaft 130. Refrigerant flows within the pipes 201 and 202 from one side of the axial direction to the other. The pipes 201 and 202 have openings at their ends on one side of the axial direction, through which the refrigerant flows out to the outside of the pipes 201 and 202. It should be noted that the motor 100 may also omit the pipes 201 and 202, and instead, an oil passage may be formed within the frame 140 to replace the pipes 201 and 202.

[0030] Figure 3 This is a side view of the bracket 160 viewed from the opposite axial side. The bracket 160 has ribs 160c, 160d, 160e, and 160f projecting from the base 160a to the opposite axial side. The bracket 160 has a flow path 161 sandwiched between ribs 160c and 160e. The bracket 160 has a flow path 161 sandwiched between ribs 160d and 160f. Refrigerant flowing out from the opening at one axial end of the pipe 201 flows down in the flow path 161 formed by ribs 160c and 160e due to its own weight. Refrigerant flowing out from the opening at one axial end of the pipe 202 flows down in the flow path 162 formed by ribs 160d and 160f due to its own weight.

[0031] The bracket 160 has through holes 163 and 164 extending from one axial side to the other axial side. Through hole 163 is located downstream of flow path 161, through which refrigerant flowing down in flow path 161 on the other axial side of the bracket 160 reaches the axial side of the bracket 160. Through hole 164 is located downstream of flow path 162, through which refrigerant flowing down in flow path 162 on the other axial side of the bracket 160 reaches the axial side of the bracket 160. The sidewalls of through holes 163 and 164 are tapered, with the axial side being lower in the vertical direction than the axial side, thereby allowing refrigerant flowing down in flow paths 161 and 162 to easily pass through through holes 163 and 164.

[0032] Through holes 163 and 164 communicate with the rotary transformer chamber 306 on one axial side of the bracket 160. The refrigerant reaching one axial side of the bracket 160 through through holes 163 and 164 is stored in the rotary transformer chamber 306.

[0033] In addition, the refrigerant flowing out from the openings at one axial end of pipes 201 and 202 can also reach the rotary transformer chamber 306 via the path through bearing 172.

[0034] An inverter (not shown) for a drive motor 100 is disposed on one axial side of the rotary transformer chamber 306 of the bracket 160. However, by blocking one axial side of the rotary transformer chamber 306 with a sensor cover 305, it is possible to prevent the refrigerant stored in the rotary transformer chamber 306 from leaking to the inverter side.

[0035] The refrigerant stored in the rotary transformer chamber 306 reaches the hollow section 130b through the through hole of the rotary transformer fixing part 304 and the opening 130aa of the shaft 130. When the rotor 110 rotates, the refrigerant in the hollow section 130b is sprayed radially outward of the shaft 130 through the refrigerant oil passage 130ba under the action of centrifugal force, thereby cooling the rotor 110.

[0036] The rotary transformer chamber 306 can have either a hollow section 130b as the sole outlet for the refrigerant, or it can have a discharge port on its lower vertical side to discharge the refrigerant from the rotary transformer chamber 306 to the outside. In the latter case, by ensuring that the amount of refrigerant discharged from the discharge port is less than the amount of refrigerant supplied to the rotary transformer chamber 306, the refrigerant supply to the hollow section 130b can be guaranteed.

[0037] The ribs 160c, ribs 160d, ribs 160e, ribs 160f, through holes 163 and 164 of the bracket 160 function as guides to direct the refrigerant to the rotary transformer chamber 306.

[0038] According to this embodiment, refrigerant can be supplied from the conventionally provided rotary transformer chamber 306 to the hollow portion 130b of the shaft 130 without the need for a new structure for supplying refrigerant to the shaft 130. Therefore, it does not hinder miniaturization and can also reduce costs.

[0039] This invention is not limited to the embodiments described above, and various modifications and design changes can be made without departing from the spirit of the invention. Furthermore, the embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of this invention is defined not by the foregoing description but by the claims, and is intended to include all modifications equivalent to and within the scope of the claims.

[0040] This application claims priority based on Japanese Patent Application No. 2024-043218, filed on March 19, 2024, and incorporates all the contents described therein.

[0041] Explanation of reference numerals in the attached figures

[0042] 100 Motor, 110 Rotor, 120 Stator, 130 Shaft, 130a Hollow Section, 130aa Open Section, 130b Hollow Section, 140 Frame, 150 Bracket, 160 Bracket, 301 Rotary Transformer, 306 Rotary Transformer Chamber.

Claims

1. A rotating machine, characterized in that, The rotating machine has: stator; The rotor faces the stator across a gap; A shaft, which is a rotating shaft fixed to the rotor; A rotary transformer that measures the rotation angle of the rotor; A rotary transformer compartment that houses the rotary transformer on one axial side of the shaft; The guide section guides the refrigerant to the rotary transformer chamber; A frame, the frame housing the stator and the rotor; and A bracket, the bracket being disposed on one axial side of the frame. The shaft has: a hollow portion extending from an opening on one axial side to the other axial side; and a refrigerant oil passage extending radially outward from the hollow portion through the shaft. The shaft is supported on the bracket via bearings. The opening is connected to the rotary transformer chamber. The end of the shaft on one axial side extends through the bracket from the other axial side to the other axial side. The rotary transformer chamber is the space on one axial side of the bracket, and the opening on one axial side of the rotary transformer chamber is blocked by a sensor cover. The guide portion includes a through hole that extends from one axial side to the other axial side through the bracket.

2. The rotating machine as described in claim 1, characterized in that, The guide portion includes a flow path formed by ribs disposed on the bracket.

3. The rotating machine as described in claim 1, characterized in that, The refrigerant flows from the other side of the bracket to the other side via the bearing and is guided to the rotary transformer chamber.

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