Rotating electrical machine

Abstract

A technique is provided that can effectively suppress the temperature rise of a rotary electric motor. The rotary electric motor includes: a main body (10) having a rotor and a stator; a frame (20) housing the main body (10); the frame (20) includes: a first receiving portion (5) surrounding the main body (10) circumferentially; a second receiving portion (6) housing a bearing for rotatably supporting a rotating shaft (2); and a cooling path (R) formed in the frame (20) extending from a cooling medium inlet (Rs) without branching to a cooling medium outlet (Re), the cooling path (R) comprising a first cooling path portion (R1) passing through the interior of the first receiving portion (5) and a second cooling path portion (R2) passing through the interior of the second receiving portion (6).

Description

Technical Field

[0001] This disclosure relates to a rotary electric motor. Background Technology

[0002] Like motors and generators, machines that convert mechanical energy into electrical energy and have rotating parts are collectively called rotating electric machines, etc., and are mounted on various machines.

[0003] A rotating electric motor has a rotor and a stator, for example, by supplying power to coils wound on the stator core to make the rotor rotate.

[0004] Typically, rotating electric machines are equipped with cooling structures to dissipate heat generated during power supply to the outside. For example, Patent Document 1 proposes a cooling structure for an internal rotor type rotating electric machine in which the rotor is arranged inside the stator, wherein a water-cooled jacket is provided around the outer periphery of a motor frame that surrounds the stator and water is circulated through it, thereby dissipating heat from the outer periphery of the stator. Another example is Patent Document 2, which proposes a cooling structure in which a portion of the cooling medium flowing in the cooling water channels formed in the motor frame is diverted and flows inside a support housing a bearing provided on the rotating shaft, thereby dissipating heat not only from the outer periphery of the stator but also from the bearing side.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 10-52002

[0008] Patent Document 2: Japanese Patent Application Publication No. 2018-207673 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, in recent years, with the miniaturization of fuel cell vehicles (FCVs), there has been a demand for miniaturization of the fuel cell stacks they carry. In order to obtain a large amount of electricity from a small fuel cell stack, it is effective to use a compressor to feed high-pressure air into the fuel cell stack; therefore, a small compressor capable of achieving a high compression ratio is needed.

[0011] The so-called multi-stage compressor is widely valued as a compressor that meets such requirements. Figure 23A schematic illustration of a multi-stage compressor configuration is shown. In this illustrated multi-stage compressor, a first rotating blade (low-pressure side rotating blade) 91 is provided at one end of the rotating shaft 81 protruding from the frame 80 of the rotary motor 8, and a second rotating blade (high-pressure side rotating blade) 92 is provided at the other end. Furthermore, on each side 801, 802 of the frame 80 at the shaft end, a receiving portion 90 is provided to accommodate each rotating blade 91, 92. Each receiving portion 90 is hermetically installed on each side 801, 802 of the frame 80, thereby forming a space (accommodation space) 90a for accommodating each rotating blade 91, 92, and a generally annular space surrounding the receiving space 90a, i.e., a space (flow path space) 90b for allowing air compressed by the rotation of the rotating blades 91, 92 accommodated therein to circulate.

[0012] In this configuration, when the rotating shaft 81 is driven to rotate, air drawn in from near the center of the low-pressure side rotating blade 91 is compressed to a first pressure by the rotation of the low-pressure side rotating blade 91. The air G1 compressed by the rotation of the low-pressure side rotating blade 91 flows through the flow path space 90b into a pipe (not shown) connected thereto, and through this pipe, is delivered to near the center of the high-pressure side rotating blade 92. Furthermore, it is further compressed to a second pressure by the rotation of the high-pressure side rotating blade 92. The air G2 compressed by the rotation of the high-pressure side rotating blade 92 is ejected through the flow path space 90b from the pipe (not shown) connected thereto. In this way, by performing two-stage compression by the two rotating blades 91 and 92, a high compression ratio can be achieved in a small compressor.

[0013] In such a compressor, the air G1 and G2 compressed by the rotation of the rotating blades 91 and 92 reach a considerably high temperature (typically, even the air G1 on the low-pressure side is mostly high-temperature). Therefore, during operation, the rotary motor 8 is continuously heated by the heat from this high-temperature air G1 and G2, causing the rotary motor 8 to heat up. In particular, the bearings located on the shaft 81, being positioned close to the heat source air G1 and G2, experience significant temperature increases.

[0014] Furthermore, comparing the low-pressure side and the high-pressure side, the air G2 on the high-pressure side is naturally hotter than the air G1 on the low-pressure side. Therefore, the high-pressure side of the rotary motor 8 is heated particularly intensely.

[0015] Furthermore, such as Figure 23As illustrated in the example, when the housing space 90a that accommodates each rotating blade 91, 92 and the flow path space 90b that supplies the compressed air G1, G2 are closed by the sides 801, 802 of the frame 80 of the rotary motor 8, each side 801, 802 is directly exposed to the high-temperature air G1, G2, and the rotary motor 8 is subjected to particularly large thermal effects.

[0016] Thus, the rotating electric motor heats up not only through its internal factors (heating from the stator, rotor, bearings, etc.), but also through heating by external heat sources (e.g., compressed air G1, G2 that has become hot). Existing technology cannot adequately suppress the temperature rise of the rotating electric motor caused by these various factors, necessitating new technologies.

[0017] The present invention was made in view of the above-mentioned problems, and its object is to provide a technology that can effectively suppress the temperature rise of a rotating electric motor.

[0018] Solution for solving the problem

[0019] To achieve the above objectives, the present invention employs the following methods.

[0020] That is, the present invention is a rotary motor comprising: a main body having a rotor and a stator; and a frame having a housing of the main body; the rotary motor is characterized in that the frame having: a first housing portion surrounding the main body circumferentially; and a second housing portion housing a bearing for rotatably supporting a rotating shaft; and a cooling path being formed in the frame having a cooling medium outlet extending from an inlet of a cooling medium without branching midway, the cooling path comprising a first cooling path portion passing through the interior of the first housing portion and a second cooling path portion passing through the interior of the second housing portion.

[0021] According to this configuration, not only is a first cooling path portion provided inside the first receiving portion, but a second cooling path portion is also provided inside the second receiving portion. Therefore, for example, if a heat source (e.g., hot air) is present on the outer side of the frame portion, i.e., the shaft end side of the rotating shaft, the second receiving portion can block at least a portion of the heat conducted from the heat source. That is, the second receiving portion can function as a heat-blocking component. In addition, by allowing the cooling medium to circulate in the first and second cooling path portions provided inside the first and second receiving portions, heat dissipation is achieved from both the outer peripheral side of the main body and the bearing side. Therefore, the temperature rise of the rotor, stator, and bearings can also be suppressed. Furthermore, since the cooling path is a single path from the inlet to the outlet without branching in the middle, a certain flow rate of cooling medium can flow throughout the entire cooling path, maintaining stable heat-blocking performance. Therefore, the temperature rise of the rotating motor can be sufficiently suppressed.

[0022] Preferably, in the rotary motor, the first receiving portion is characterized by having a hollow space that surrounds the main body in the circumferential direction and is open at its axial end, the open end of the hollow space being closed by the second receiving portion, and at least a portion of the hollow space forming the first cooling path portion.

[0023] According to this configuration, a portion of the cooling medium passing through the first cooling path can come into contact with the second receiving portion. That is, the cooling medium passing through the first cooling path can absorb heat from the second receiving portion. As a result, the thermal blocking performance of the second receiving portion can be particularly improved, and heat dissipation from the bearing side can be promoted.

[0024] Preferably, in the rotary motor, the second receiving portion is respectively disposed on one side and the other side of the axial direction of the first receiving portion, and the second cooling path portion is disposed only in one of the two second receiving portions.

[0025] With this configuration, for example, if a relatively high-temperature heat source exists on the outer side of the frame and at one end of the rotating shaft, by providing a second cooling path portion in the second receiving portion disposed on that side, at least a portion of the heat conducted from the heat source can be blocked by the second receiving portion. Furthermore, it is also possible to design the size of the second receiving portion on the side without the second cooling path portion to be smaller than the size of the second receiving portion on the other side, thereby reducing the overall size of the rotary motor.

[0026] Preferably, in the rotary motor, the second receiving portion is respectively disposed on one side and the other side of the axial direction of the first receiving portion, and the second cooling passage portion is disposed on both sides of the two second receiving portions.

[0027] With this configuration, for example, when there are heat sources on the outer side of the frame and on both ends of the rotating shaft, by providing second cooling path portions on both sides of the two second receiving portions, at least a portion of the heat conducted from each heat source can be blocked by each second receiving portion. Furthermore, with this configuration, heat can be dissipated from both bearings provided on both sides of the rotating shaft, thus achieving particularly high heat dissipation performance.

[0028] Invention Effects

[0029] According to the present invention, the temperature rise of the rotating motor can be effectively suppressed. Attached Figure Description

[0030] Figure 1 This is an external view of the rotary electric motor according to the first embodiment.

[0031] Figure 2 From Figure 1Observe the cross-sectional view of the rotating electric machine in the direction of arrow A.

[0032] Figure 3 From Figure 1 Observe the diagram of the rotating motor in the direction of arrow B.

[0033] Figure 4 This is a diagram showing the first housing section as viewed from the high-pressure side.

[0034] Figure 5 This is a diagram showing the first housing section as viewed from the low-pressure side.

[0035] Figure 6 It is a diagram showing the hollow space formed inside the first accommodating part.

[0036] Figure 7 It is a diagram showing the hollow space formed inside the first accommodating part.

[0037] Figure 8 This is a diagram showing the second housing on the high-voltage side as viewed from the side of the first housing.

[0038] Figure 9 This is a diagram showing the frame from the high-voltage side.

[0039] Figure 10 It is a diagram showing the overall structure of the cooling circuit.

[0040] Figure 11 From Figure 1 The diagram shows the rotary motor of the second embodiment viewed in the direction of arrow B.

[0041] Figure 12 This is a diagram showing the first housing section as viewed from the high-pressure side.

[0042] Figure 13 This is a diagram showing the first housing section as viewed from the low-pressure side.

[0043] Figure 14 It is a diagram showing the hollow space formed inside the first accommodating part.

[0044] Figure 15 This is a diagram showing the second housing on the low-pressure side as viewed from the side of the first housing.

[0045] Figure 16 This is a diagram showing the frame from the high-voltage side.

[0046] Figure 17 This is a view of the frame from the low-pressure side.

[0047] Figure 18 It is a diagram showing the overall structure of the cooling circuit.

[0048] Figure 19It is a diagram showing the overall structure of the cooling circuit.

[0049] Figure 20 This is a schematic diagram illustrating a configuration example where a rotary electric motor is applied to a compressor.

[0050] Figure 21A It is a schematic diagram representing the cooling path.

[0051] Figure 21B It is a schematic diagram representing the cooling path.

[0052] Figure 22A This is a schematic diagram illustrating a cooling path as a comparative example.

[0053] Figure 22B This is a schematic diagram illustrating a cooling path as a comparative example.

[0054] Figure 22C This is a schematic diagram illustrating a cooling path as a comparative example.

[0055] Figure 23 This is a schematic diagram illustrating an example of the configuration of a compressor. Detailed Implementation

[0056] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0057] <1. First Implementation Method>

[0058] <1-1. Basic Components of a Rotary Electric Machine>

[0059] Reference Figures 1-3 The basic structure of the rotary electric motor according to the first embodiment will be described. Figure 1 This is an external view of the rotary motor 100 according to the first embodiment. Figure 2 From Figure 1 Observe the cross-sectional view of the rotary motor 100 in the direction of arrow A. Figure 3 From Figure 1 The diagram of the rotary motor 100 is viewed in the direction of arrow B. However, for ease of explanation, in... Figure 3 The frame section 20 is shown in cross-section.

[0060] The rotary electric motor 100 includes a main body 10, which is composed of a rotor 1, a rotating shaft 2, a bearing 3, a stator 4, etc.

[0061] Rotor 1 is a cylindrical component with permanent magnets (not shown) divided into cylindrical or arched shapes bonded to its axial center using adhesive or the like. A cylindrical through-hole is provided at the radial center of rotor 1, through which a rotating shaft 2 is inserted. The axial length of the rotating shaft 2 is longer than that of rotor 1, and it protrudes from both ends of rotor 1.

[0062] The stator 4 is a generally cylindrical component formed by stacking multiple electromagnetic steel plates axially, and is configured to surround the outer circumferential surface of the rotor 1. The stator 4 has a stator core 41, which is integrally formed by including a cylindrical magnetic yoke 41a and multiple teeth 41b extending radially inward from the inner circumferential surface of the magnetic yoke 41a. The multiple teeth 41b are arranged at intervals along the circumferential direction, and a wire (coil wire) 42a with a coil 42 is wound and mounted on each tooth 41b. Thus, the coil wire 42a is arranged in the gaps (slots) between adjacent teeth 41b. In addition, the portion of the coil wire 42a that protrudes towards the axial end face of the stator core 41 is sealed with resin on the basis of stamping, thereby forming an annular coil end 42b. It should be noted that the coil wire 42a may also be covered with insulating paper inside the slot. In addition, a wedge-shaped piece or the like may be arranged at the inner end of the slot.

[0063] Coil 42 is a three-phase coil including a U-phase coil, a V-phase coil, and a W-phase coil. Each end is led out radially outward from one end 42b of a coil and connected to one end of the power line 43 of each phase. The other end of the power line 43 of each phase is connected to the drive device. When a three-phase AC voltage is applied to the coil 42 from the drive device, the rotor 1 rotates, and the rotational driving force is output from the rotating shaft 2.

[0064] The rotary motor 100 also includes a frame portion 20 that houses the main body portion 10. The frame portion 20 is composed of a first housing portion (motor housing) 5, two second housing portions (bearing brackets) 6, a cover portion 7, etc.

[0065] The first receiving portion 5 is a component that circumferentially surrounds and accommodates the main body portion 10, and is formed, for example, by die casting of aluminum. The first receiving portion 5 has a cylindrical receiving space 51 that is open at both ends in the axial direction. The inner diameter of the receiving space 51 is approximately the same as the outer diameter of the stator 4, and its axial dimension is approximately the same as the axial dimension of the stator 4. The stator 4 is fixed relative to the first receiving portion 5 in a coaxial position relative to the receiving space 51. Furthermore, a portion of the cooling passage R (the first cooling passage portion) R1 is provided in the first receiving portion 5, which will be described in detail later.

[0066] The second receiving portion 6 is a circular plate-shaped component provided on each end face of the first receiving portion 5 along its axial direction. Each second receiving portion 6 is liquid-tightly mounted relative to the first receiving portion 5 by means of O-rings K1 and K2 sandwiched between them. Furthermore, a bearing 3 is fitted at the center of each second receiving portion 6, thereby accommodating the bearing 3 in each second receiving portion 4. The bearing 3 is, for example, a ball bearing. The rotating shaft 2 (and thus the rotor 1) is rotatably supported relative to the two second receiving portions 6 by means of the two bearings 3 fitted into the two second receiving portions 6. At least one of the two second receiving portions 6 (in this embodiment, only one second receiving portion 6) is provided with a portion of the cooling passage R (the second cooling passage portion) R2, which will be described in detail later.

[0067] The cover 7 is a component provided on the upper end side of the first receiving part 5, and the terminal of the power line 43 is housed inside it.

[0068] The rotary motor 100 is, for example, mounted on a multi-stage compressor. The configuration of the multi-stage compressor can be arbitrary. Figure 20 This indicates that the rotary motor 100 is mounted on Figure 23 This is an example of the configuration of a multi-stage compressor. In this case, a low-pressure side rotating blade 91 is provided on one end of the rotating shaft 2, which protrudes from the frame portion 20, and a high-pressure side rotating blade 92 is provided on the other end. Furthermore, a receiving portion 90 for receiving each rotating blade 91 and 92 is airtightly installed on the side of each second receiving portion 6, thereby forming the aforementioned receiving space 90a and flow path space 90b between each receiving portion 90 and the side of each second receiving portion 6. The operation of the multi-stage compressor with this configuration is as described above. When the rotary motor 100 is mounted on such a compressor, the end of the rotating shaft 2 on the side where the low-pressure side rotating blade 91 is located is the "low-pressure side," and the end of the rotating shaft 2 on the side where the high-pressure side rotating blade 92 is located is the "high-pressure side." It should be noted that... Figure 1 , Figure 3 In the example shown, the coil end 42b side connected to the power line 43 is represented as the low-voltage side, but the coil end 42b side can also be set as the high-voltage side.

[0069] <1-2. Cooling Path R>

[0070] A cooling path R is provided in the frame portion 20. By allowing the cooling medium (e.g., cooling water) to flow from the cooling medium supply portion (not shown) to the cooling path R, the main body portion 10 is prevented from overheating.

[0071] The cooling path R includes a first cooling path portion R1 for cooling from the main body 10 side, a second cooling path portion R2 for cooling from the bearing 3 side on the high-pressure side, and a connecting path portion R3. The formation of each of these portions R1, R2, and R3 will be described in detail below.

[0072] (First cooling path section R1 and connecting path section R3)

[0073] The first cooling path portion R1 and the connecting path portion R3 are provided in the first receiving portion 5. Hereinafter, refer to... Figures 4-7 The formation methods of these parts R1 and R3 are explained. Figure 4 This is a diagram showing the first receiving section 5 as viewed from the high-pressure side. Figure 5 This is a view of the first receiving section 5 from the low-pressure side. Additionally, Figure 6 , Figure 7 This is a diagram showing the hollow space 52 formed inside the first receiving part 5.

[0074] In the first receiving portion 5, a generally cylindrical hollow space (cylindrical space) 52 is provided, which circumferentially surrounds the receiving space 51 (and thus the main body portion 10 housed therein), and is open at its axial end. Furthermore, the interior of the cylindrical space 52 is divided by multiple partitions (a long partition 53 and multiple short partitions 54) and a dividing portion 55. It should be noted that the cylindrical space 52 does not need to be perfectly cylindrical; for example, it can be shaped to avoid interference with portions such as the space 521 for inserting the power line 43.

[0075] The elongated partition 53 and the plurality of short partitions 54 are portions that extend axially and divide the cylindrical space 52 circumferentially, and are arranged at approximately equal intervals circumferentially. The elongated partition 53 is integrally provided from one end of the cylindrical space 52 across the other end axially, completely dividing the cylindrical space 52 circumferentially. On the other hand, the short partitions 54 are provided across a point between one end of the cylindrical space 52 axially and a midway point before reaching the other end, partially (e.g., about three-quarters) dividing the cylindrical space 52 circumferentially.

[0076] The short strip divider 54 has three or more (nine in the example shown in the figure). Furthermore, as... Figure 6 , Figure 7As shown, these odd-numbered short strip dividers 54 are arranged in a manner in which short strip dividers near the high-voltage side and short strip dividers near the low-voltage side appear alternately in the circumferential direction. Now, viewed from the high-voltage side, starting from the long strip divider 53, when numbered in a clockwise direction as the first short strip divider 54(1), the second short strip divider 54(2), ..., the ninth short strip divider 54(9), the odd-numbered short strip dividers 54(1), 54(3), ..., 54(9) are near the high-voltage side, and the even-numbered short strip dividers 54(2), 54(4), ..., 54(8) are near the low-voltage side.

[0077] Therefore, as Figure 4 As shown, on the high-pressure side end face of the first receiving portion 5, an arc-shaped opening (first opening) S1 is formed between the long strip partition 53 and the first short strip partition 54(1). Additionally, an arc-shaped opening (second opening) S2 is also formed between the long strip partition 53 and the ninth short strip partition 54(9). Furthermore, between each of the odd-numbered short strip partitions 54(1), 54(3), ..., 54(9), an arc-shaped opening S3 is formed, equivalent to the length of the combined first opening S1 and second opening S2. On the other hand, as... Figure 5 As shown, on the low-pressure side end face of the first receiving portion 5, between the long strip partition 53 and each of the even-numbered short strip partitions 54(2), 54(4), ..., 54(8), an arc-shaped opening S3 is formed, equivalent to the length of the combined first opening S1 and the second opening S2. These openings S1, S2, and S3 appearing on the end faces of both the low-pressure and high-pressure sides are closed by liquid-tightly installing the second receiving portion 6 on each end face.

[0078] Thus, in the cylindrical space 52, with the first opening S1 and the second opening S2 as the two ends, a meandering path, i.e. a serpentine path, is formed by alternating portions that extend axially guided by each short strip partition 54 and U-shaped portions that fold back 180 degrees around the ends of each short strip partition 54.

[0079] The dividing section 55 is a portion provided in a manner that spans circumferentially between the long strip dividing section 53 and the first short strip dividing section 54(1), and axially divides the space between the long strip dividing section 53 and the first short strip dividing section 54(1). Thus, the serpentine path formed in the cylindrical space 52 is divided into a short strip portion 52a from the first opening S1 to the dividing section 55 and a serpentine portion 52b from the second opening S2 to the dividing section 55. The short strip portion 52a constitutes the connecting path portion R3 in the cooling path R, and the serpentine portion 52b of the latter constitutes the first cooling path portion R1 in the cooling path R.

[0080] (Second cooling path section R2)

[0081] The second cooling path section R2 is provided in the second housing section 6 on the high-pressure side. Hereinafter, when distinguishing between the second housing sections 6 on the high-pressure side and the low-pressure side, the former will be referred to as "high-pressure side second housing section 6o" and the latter as "low-pressure side second housing section 6i".

[0082] Reference Figure 8 The configuration of the second cooling path section R2, which is provided in the second housing section 6o on the high-pressure side, will be described. Figure 8 This is a diagram showing the second high-voltage side housing 6o as viewed from the side of the first housing.

[0083] In the second receiving portion 6o on the high-pressure side, a C-shaped hollow space (C-shaped space) 621 is provided, which, viewed axially, substantially surrounds the receiving through hole 61 circumferentially. Each end of the C-shaped space 621 communicates with one end of a radially extending straight hollow space (extension space) 622. Furthermore, the other end of each extension space 622 communicates with an opening 63 provided on the surface of the second receiving portion 6o on the high-pressure side opposite to the first receiving portion 5. The portion 62 formed by the C-shaped space 621 and each extension space 622 constitutes the second cooling path portion R2 in the cooling path R.

[0084] (Overall structure of cooling circuit R)

[0085] Next, refer to Figure 9 , Figure 10 The overall structure of the cooling circuit R will be explained. Figure 9 This is a view of the frame section 20 from the high-voltage side. Figure 10 This is a diagram showing the overall structure of the cooling path R.

[0086] As described above, the openings S1, S2, and S3 that appear on the low-pressure side and high-pressure side end faces of the first receiving portion 5 are closed by liquid-tightly installing the high-pressure side second receiving portion 6o or the low-pressure side second receiving portion 6i on each end face.

[0087] However, on the side of the high-voltage side second receiving portion 6o, two openings 63 constituting each end of the second cooling path portion R2 are provided. With the high-voltage side second receiving portion 6o installed on the high-voltage side end face of the first receiving portion 5, these openings 63 are positioned on that end face to communicate with the first opening S1 and the second opening S2, respectively. Therefore, by installing the high-voltage side second receiving portion 6o on the high-voltage side end face of the first receiving portion 5, one end of the connecting path portion R3, i.e., the first opening S1, is connected to one end of the second cooling path portion R2, and one end of the first cooling path portion R1, i.e., the second opening S2, is connected to the other end of the second cooling path portion R2.

[0088] Thus, the connecting path R3, the second cooling path R2, and the first cooling path R1 are connected in series to form a single cooling path R that does not branch in the middle (i.e., has no branches).

[0089] At both ends of the cooling path R, a cooling medium inlet Rs or an outlet Re is provided. That is, a cooling medium inlet Rs is provided at the end of the connecting section R3 of the cooling path R, and a cooling medium outlet Re is provided at the end of the first cooling path section R1.

[0090] In this configuration, the cooling medium introduced from the inlet Rs flows into the second cooling channel section R2 through the connecting channel section R3 and flows there. Since the second cooling channel section R2 is located inside the second receiving section 6o on the high-pressure side and is arranged to surround the receiving through hole 61 of the receiving bearing 3 in a circumferential direction, heat dissipation from the bearing 3 side on the high-pressure side is achieved by allowing the cooling medium to pass through here.

[0091] Furthermore, by providing a second cooling passage portion R2 in the high-pressure side second receiving portion 6o, the cooling medium passes through this portion, and the high-pressure side second receiving portion 6o functions as a heat-blocking component. That is, for example, in the case where the rotary motor 100 is mounted on a multi-stage compressor ( Figure 20 On the outer side of the frame portion 20 and the high-pressure side of the rotating shaft 2, there exists high-temperature air G2, which is compressed and heated by the rotation of the high-pressure side rotating blade 92, serving as a heat source. Heat conducted from this air G2 is transferred from the side wall of the high-pressure side second housing portion 6o (specifically, the side wall portion constituting part of the housing space 90a and the flow path space 90b) to the interior of the high-pressure side second housing portion 6o, causing the high-pressure side second housing portion 6o to heat up. This increases the thermal resistance of the heat conduction path. However, a second cooling path portion R2 is provided in the high-pressure side second housing portion 6o, through which a cooling medium flows. Therefore, the heat conduction path to the cooling path R is shorter than that of the low-pressure side second housing portion 6i, resulting in lower thermal resistance, thus effectively suppressing the heating of the high-pressure side second housing portion 6o. That is, the heat conducted from the high-temperature air G2, which serves as a heat source, is blocked by the high-pressure side second housing portion 6o. Furthermore, by having a portion of the heat conducted from the air G2 absorbed by the cooling medium, the heating of the high-pressure side second housing portion 6o can also be effectively suppressed. Furthermore, the heat conduction path from the bearing 3 to the cooling path R is shorter than that of the second housing 6i on the low-pressure side, resulting in a smaller thermal resistance. This also suppresses the temperature rise of the bearing 3 housed in the second housing 6o on the high-pressure side.

[0092] The cooling medium, which draws heat from the high-pressure side of the bearing 3 by flowing through the second cooling path section R2, then flows into the first cooling path section R1 and flows there. The first cooling path section R1 is located inside the first receiving portion 5 and is arranged as a serpentine path that encompasses approximately the entire peripheral wall portion surrounding the receiving space 51. That is, by causing the cooling medium to flow axially and repeatedly zigzag at the ends, the cooling medium effectively scans approximately the entire peripheral wall portion surrounding the receiving space 51. This allows for sufficient heat dissipation from the outer periphery of the main body 10 (more specifically, the outer periphery of the stator 4). The cooling medium flowing through the first cooling path section R1 is discharged from the outlet Re.

[0093] exist Figure 21A as well as Figure 21B The configuration of the cooling path R in this embodiment is schematically shown in the figures. As shown in these figures, the cooling path R includes a first cooling path portion R1 passing through the interior of the first receiving portion 5 and a second cooling path portion R2 passing through the interior of one of the second receiving portions 6 (high-pressure side second receiving portion 6o). Therefore, heat is dissipated from both the outer periphery of the main body 10 and the bearing 3 side on the high-pressure side by the cooling medium flowing through each cooling path portion R1 and R2. Thus, sufficient heat dissipation can be achieved from both the outer periphery of the main body 10 and the bearing 3 side on the high-pressure side. In addition, since the cooling path R includes the second cooling path portion R2 passing through the interior of the high-pressure side second receiving portion 6o, the high-pressure side second receiving portion 6o can function as a heat-blocking component. That is, by blocking at least a portion of the heat conducted from the heat source G2 located on the outside of the frame portion 20 and on the high-pressure side of the rotating shaft 2, the temperature rise of the main body 10 (especially the bearing 3 on the high-pressure side) can be suppressed.

[0094] According to the thermal analysis simulations conducted by the inventors to verify the effect of installing the second cooling path R2, in the case of an output SPM motor, the temperature of the high-voltage side bearing 3 is 125°C without the second cooling path R2, and 115°C with the second cooling path R2. This demonstrates that installing the second cooling path R2 can achieve a temperature rise suppression effect of 10°C. While a high temperature of 125°C could potentially significantly damage the product life of bearing 3, reducing the temperature by approximately 10°C can prevent this and ensure the product life of bearing 3.

[0095] Furthermore, in this embodiment, the cooling path R becomes a single, unbranched path (written in one stroke) from the inlet Rs to the outlet Re. Therefore, even if the state (pressure, etc.) of the cooling medium supplied from the inlet Rs changes, the flow rate of the cooling medium in each part of the cooling path R remains constant. That is, a constant flow rate of refrigerant can be achieved throughout the entire cooling path R. Therefore, the heat-blocking performance of the second containment portion 6o on the high-pressure side is stably maintained. That is, at least a portion of the heat conducted from the heat source G2 can be stably blocked, sufficiently suppressing the temperature rise of the bearing 3 on the high-pressure side.

[0096] For example, such as Figure 22A As shown, it is also possible to consider branching the cooling path from the inlet Rs to the outlet Re into a portion R1 passing through the interior of the first receiving portion 5 and a portion R2 passing through the interior of the second receiving portion 6. In this configuration, heat dissipation is achieved from both the outer periphery of the main body 10 and the bearing 3 side. However, in this configuration, when the state of the cooling medium supplied from the inlet Rs changes, the flow rate in each branch of the cooling path varies erratically depending on the flow resistance of that branch. Therefore, it is difficult to stably maintain the heat-blocking performance of the high-pressure side second receiving portion 6o. That is, in Figure 21A The cooling path shown in the middle branch cannot achieve the same effect as the cooling path R in this embodiment.

[0097] Additionally, in the cooling path R of this embodiment, such as Figure 21AAs shown, the second cooling path section R2 is positioned upstream of the first cooling path section R1, and cooling from the bearing 3 side is prioritized over cooling from the outer periphery of the main body 10. In other words, the cooling medium passes through the first cooling path section R1 after passing through the second cooling path section R2. With this configuration, the cooling medium flows through the second cooling path section R2 at a sufficiently low temperature, thus achieving high thermal insulation performance in the high-pressure side second containment section 6o. Furthermore, with this configuration, the cooling medium flowing in the cooling path R takes heat from the bearing 3 when passing through the second cooling path section R2, and then passes through the first cooling path section R1 in a slightly warmed state, at which point it takes heat from the outer periphery of the main body 10. Typically, when the outer periphery of the main body 10 is hotter than the bearing 3, the cooling medium flows through the second cooling path section R2, which is near the relatively cool bearing 3, while remaining at a sufficiently low temperature. Conversely, it flows through the first cooling path section R1, which is near the relatively hot outer periphery of the main body 10, after slightly warming from its sufficiently low temperature state. Therefore, in either cooling path section R1 or R2, the temperature difference between the cooling medium and the object being cooled is sufficiently large. This ensures that both the heat dissipation performance from the bearing 3 side and the heat dissipation performance from the outer periphery of the main body 10 are sufficiently high. Furthermore, by allowing the sufficiently low-temperature cooling medium to flow near the bearing 3, the deterioration of the lubricant (grease, etc.) used in the bearing 3 can be suppressed.

[0098] For example, such as Figure 22B As shown, it is also possible to consider a second cooling path section R2 as a cooling path located downstream of the first cooling path section R1, i.e., a cooling path where cooling from the outer periphery of the main body 10 takes priority over cooling from the bearing 3 side. However, in this configuration, the cooling medium flowing in the cooling path passes through the first cooling path section R1 and then through the second cooling path section R2. That is, the cooling medium flowing in the cooling path takes heat from the outer periphery of the main body 10 when passing through the first cooling path section R1, and then passes through the second cooling path section R2 in a state where it has heated up due to this heat. In this case, since the temperature of the cooling medium flowing in the second cooling path section R2 is not sufficiently low, the heat-blocking performance of the high-pressure side second containment section 6o is reduced. Furthermore, the cooling medium flows near the relatively high temperature outer periphery of the main body 10 in a state where it is sufficiently low, and flows near the relatively low temperature bearing 3 in a state where it has heated up from the sufficiently low temperature state. Therefore, the temperature difference between the cooling medium and the bearing 3 in the second cooling path section R2 becomes smaller, and thus, the heat dissipation performance from the bearing 3 side is also reduced. Thus, in Figure 22B The second cooling path section R2 shown is located in the cooling path on the downstream side, and cannot achieve the same effect as the cooling path R in this embodiment.

[0099] <1-3 Effects>

[0100] The rotary motor 100 according to this embodiment includes a main body 10 and a frame 20. The main body 10 includes a rotor 1 and a stator 4, and the frame 20 houses the main body 10. Here, the frame 20 includes a first receiving portion 5 that circumferentially surrounds the main body 10 and a second receiving portion 6 that houses a bearing 3 for rotatably supporting a rotating shaft 2. Furthermore, a cooling path R is formed in the frame 20, extending directly from the cooling medium inlet Rs to the cooling medium outlet Re without branching. This cooling path R includes a first cooling path portion R1 passing through the interior of the first receiving portion 5 and a second cooling path portion R2 passing through the interior of the second receiving portion 6. According to this configuration, not only is the first cooling path portion R1 provided inside the first receiving portion 5, but the second cooling path portion R2 is also provided inside the second receiving portion 6. Therefore, for example, if a heat source (e.g., hot air) is present outside the frame 20 and at the shaft end of the rotating shaft 2, at least a portion of the heat conducted from this heat source can be blocked by the second receiving portion 6. That is, the second receiving portion 6 can function as a heat-blocking component. Furthermore, by allowing the cooling medium to flow through the first and second cooling path portions R1 and R2 provided inside the first and second receiving portions 5 and 6, heat is dissipated from both the outer periphery of the main body and the bearing side 3. Therefore, the temperature rise of the rotor 1, stator 4, and bearing 3 can be suppressed. Moreover, since the cooling path R is a single path from the inlet Rs to the outlet Re without branching, a certain flow rate of cooling medium can flow throughout the entire cooling path R, maintaining stable heat-blocking performance. Therefore, the temperature rise of the rotating electric motor 100 can be sufficiently suppressed.

[0101] Furthermore, in this embodiment, the rotary motor 100 has a second cooling path portion R2 located upstream of the first cooling path portion R1 in the cooling path R. With this configuration, the cooling medium flows through the second cooling path portion R2 at a sufficiently low temperature, thus achieving high thermal insulation performance in the second receiving portion 6. Additionally, with this configuration, the cooling medium typically flows near the bearing 3, which is at a sufficiently low temperature (lower than the outer periphery of the main body portion 10), and typically flows near the outer periphery of the main body portion 10, which is at a slightly higher temperature (higher than the bearing 3), thus ensuring a sufficiently large temperature difference between the cooling medium and the object being cooled in both cooling path portions. Therefore, both the heat dissipation performance from the bearing 3 side and the heat dissipation performance from the outer periphery of the main body portion 10 can be sufficiently high.

[0102] Furthermore, as with the rotary electric motor 100 of this embodiment, when the stator 4 has an inner rotor-type main body 10 in which the rotor 1 is disposed, heat dissipation from the outer periphery of the main body 10 can sufficiently suppress the temperature rise of the stator 4. Additionally, by sufficiently dissipating heat not only from the outer periphery of the main body 10 but also from the bearing 3 side, or by suppressing heating from a heat source located near the bearing 3, the temperature rise of the bearing 3 can also be sufficiently suppressed. By sufficiently suppressing the temperature rise of the bearing 3, the heat of the rotor 1 can also be dissipated from the bearing 3 side. That is, the heat of the rotor 1 can be dissipated from the bearing 3 side via the rotating shaft 2. Thus, the temperature rise of the rotor 1 (e.g., the temperature rise caused by the heating of the magnets accompanied by eddy current losses) can also be suppressed. In this way, by suppressing the temperature rise of the stator 4, bearing 3, and rotor 1, performance degradation and shortened product life of these components can be avoided, and the performance and product life of the rotary electric motor 100 can be sufficiently guaranteed.

[0103] Furthermore, the rotary motor 100 of this embodiment has a cylindrical hollow space 52 provided in the first receiving portion 5. This cylindrical hollow space 52 surrounds the main body portion 10 circumferentially and is open at its axial end. The open end of the hollow space 52 (specifically, openings S1 to S3) is closed by the second receiving portion 6. Moreover, a portion 52b of the hollow space 52 forms a first cooling path portion R1. Therefore, the cooling medium passing through the first cooling path portion R1 comes into contact with the second receiving portion 6 when it reaches the openings S1 to S3. In other words, according to this configuration, a portion of the cooling medium passing through the first cooling path portion R1 can come into contact with the second receiving portion 6, thereby allowing the cooling medium passing through the first cooling path portion R1 to absorb heat from the second receiving portion 6. Therefore, the heat-blocking performance of the second receiving portion 6 can be particularly improved, and heat dissipation from the bearing 3 side can be further promoted.

[0104] Furthermore, in the rotary motor 100 of this embodiment, the second receiving portions 6 are respectively provided on one side and the other side of the axial direction of the first receiving portion 5, and the second cooling passage portion R2 is provided only in one of the two second receiving portions 6. In the example of the accompanying drawings, the two second receiving portions 6 are of the same size, but it is also possible to design that the size of the second receiving portion 6 on the side where the second cooling passage portion R2 is not provided is smaller than the size of the second receiving portion 6 on the other side. As a result, the overall size of the rotary motor 100 can be reduced.

[0105] In particular, in the rotary motor 100 of this embodiment, a second cooling passage portion R2 is provided in the second receiving portion 6 (high-pressure side second receiving portion 6o) disposed on the high-pressure side. When the rotary motor 100 is, for example, mounted on a multi-stage compressor ( Figure 20A relatively high-temperature heat source (air that becomes hot due to compression) G2 exists on the outside of the frame portion 20 and on the high-pressure side of the rotating shaft 2. By providing a second cooling path portion R2 in the second accommodating portion 6 disposed on the high-pressure side, at least a portion of the heat conducted from the heat source G2 can be blocked by the second accommodating portion 6.

[0106] Furthermore, in the rotary motor 100 of this embodiment, both the inlet Rs and the outlet Re are provided in the first receiving portion 5. The cooling medium introduced from the inlet Rs is introduced into the second cooling passage portion R2 provided in the second receiving portion 6 through the connecting passage portion R3 provided in the first receiving portion 5. With this configuration, compared to, for example, the connecting passage portion R3 is constructed through external piping, the overall size can be made more compact. In addition, the configuration can be simplified, and the number of parts that need to be liquid-tightly connected can be reduced.

[0107] <2. Second Implementation Method>

[0108] <2-1. Basic Components of a Rotary Electric Machine>

[0109] Reference Figure 11 The basic structure of the rotary motor 200 according to the second embodiment will be described. Figure 11 From Figure 1 Observe the diagram of the rotary motor 200 in the direction of arrow B. However, compared with... Figure 3 The same, in Figure 11 In the diagram, the frame portion 20 is shown in cross-section. It should be noted that in the following description, elements identical to those described in the first embodiment are indicated by the same reference numerals, and their descriptions are omitted.

[0110] The rotary motor 200 is the same as the rotary motor 100 in the first embodiment, and includes a main body 10, which is composed of a rotor 1, a rotating shaft 2, a bearing 3, a stator 4, etc. The structure of the main body 10 is as described above.

[0111] Furthermore, the rotary motor 200 is the same as the rotary motor 100 of the first embodiment, and includes a frame portion 20. This frame portion 20 is composed of a first receiving portion 5, two second receiving portions 6, a cover portion 7, etc. The basic structure of the frame portion 20 is the same as that of the first embodiment, but the structure of the cooling path R formed is different from that of the first embodiment. This difference will be explained below.

[0112] <2-2. Cooling Circuit R>

[0113] The cooling path R includes a first cooling path portion R1 for cooling from the main body 10 side, a second cooling path portion (high-pressure side second cooling path portion) R2o for cooling from the high-pressure side bearing 3 side, and a connecting path portion R3. Additionally, the cooling path R includes another second cooling path portion (low-pressure side second cooling path portion) R2i for cooling from the low-pressure side bearing 3 side, and a connecting path portion (additional connecting path portion) R4 for connecting the two second cooling path portions R2o and R2i to each other. The formation of each of these portions R1 to R4 will be described in detail below.

[0114] (First cooling path section R1, connecting path section R3, and additional connecting path section R4)

[0115] The first cooling path section R1, the connecting path section R3, and the additional connecting path section R4 are provided in the first receiving section 5. Hereinafter, refer to... Figures 12-14 The formation methods of these parts R1, R3, and R4 are explained. Figure 12 This is a diagram showing the first receiving section 5 as viewed from the high-pressure side. Figure 13 This is a view of the first receiving section 5 from the low-pressure side. Additionally, Figure 14 This is a diagram showing the hollow space 52 formed inside the first receiving part 5.

[0116] Similar to the first embodiment, a generally cylindrical hollow space (cylindrical space) 52 is also provided in the first receiving portion 5. This cylindrical hollow space 52 surrounds the receiving space 51 circumferentially and is open at its axial end. Moreover, the interior of the cylindrical space 52 is divided by a plurality of partitions (two long partitions 53 and a plurality of short partitions 54) and a dividing portion 55.

[0117] The basic configuration of each of the multiple partitions 53 and 54 is the same as that in the first embodiment. However, in the first embodiment, as multiple partitions 53 and 54, one long partition 53 and an odd number of short partitions 54(1) to 54(9) are provided, but in this embodiment, the long partition 53 is provided instead of the ninth short partition 54(9). That is, in this embodiment, the two long partitions 53 and the even number of short partitions 54(1) to 54(8) are arranged at approximately equal intervals in the circumferential direction.

[0118] Therefore, as Figure 12As shown, on the high-pressure side end face of the first receiving portion 5, an arc-shaped opening (fourth opening) S4 is formed between the two elongated dividing portions 53. Additionally, an arc-shaped opening (first opening) S1 is formed between one elongated dividing portion 53 and the first short dividing portion 54(1). Furthermore, an arc-shaped opening S3, equivalent to the length of the combined first opening S1 and second opening S2, is formed between each of the odd-numbered short dividing portions 54(1), 54(3), ..., 54(7) and between the elongated dividing portion 53 and the seventh short dividing portion 54(7). On the other hand, as... Figure 13 As shown, on the low-pressure side end face of the first receiving portion 5, an arc-shaped opening (fourth opening) S4 is formed between the two elongated partitions 53. Additionally, an arc-shaped opening (second opening) S2 is formed between the elongated partition 53 and the eighth short partition 54 (8). Furthermore, an arc-shaped opening S3, equivalent in length to the combined length of the first opening S1 and the second opening S2, is formed between each of the even-numbered short partitions 54 (2), 54 (4), ..., 54 (8) and between the elongated partitions 53 and the second short partition 54 (2). These openings S1 to S4 appearing on the low-pressure and high-pressure side end faces are closed by liquid-tightly installing the second receiving portion 6 on each end face.

[0119] Thus, by providing two elongated partitions 53 in the cylindrical space 52, the cylindrical space 52 is divided into an elongated portion 52c extending axially at both ends with a pair of fourth openings S4, and a C-shaped portion in the cross section. The elongated portion 52c constitutes an additional connecting passage portion R4 in the cooling passage R.

[0120] On the other hand, in the C-shaped section, a meandering path, i.e. a serpentine path, is formed, which alternates between a portion extending axially guided by each short strip partition 54 with the first opening S1 and the second opening S2 as the two ends, and a U-shaped portion that folds back 180 degrees around the end of each short strip partition 54.

[0121] The dividing section 55 is a portion disposed circumferentially between the long strip dividing section 53 and the first short strip dividing section 54(1), dividing the space between the long strip dividing section 53 and the first short strip dividing section 54(1) axially. Thus, the serpentine path formed in the C-shaped section is divided into a short strip portion 52a from the first opening S1 to the dividing section 55 and a serpentine portion 52b from the second opening S2 to the dividing section 55. The short strip portion 52a constitutes the connecting path portion R3 in the cooling path R, and the serpentine portion 52b of the latter constitutes the first cooling path portion R1 in the cooling path R.

[0122] (Second cooling path section R2o, R2i)

[0123] The high-voltage side second cooling path portion R2o is provided in the high-voltage side second receiving portion 6o. The configuration of the high-voltage side second cooling path portion R2o is the same as that in the first embodiment (see reference). Figure 8 ).

[0124] On the other hand, the second cooling path portion R2i on the low-pressure side is provided in the second receiving portion 6i on the low-pressure side. (See reference...) Figure 15 The configuration of the second cooling circuit R2i on the low-pressure side is explained. Figure 15 This is a diagram showing the low-pressure side second housing 6i viewed from one side of the first housing 5.

[0125] Similar to the high-pressure side second receiving portion 6o, the low-pressure side second receiving portion 6i also has a C-shaped hollow space (C-shaped space) 621. This C-shaped hollow space 621, viewed axially, substantially surrounds the receiving through-hole 61 circumferentially. Each end of the C-shaped space 621 communicates with one end of a radially extending straight hollow space (extension space) 622. Furthermore, the other end of each extension space 622 communicates with an opening 63 on the surface of the low-pressure side second receiving portion 6i opposite to the first receiving portion 5. The portion 62 formed by the C-shaped space 621 and each extension space 622 constitutes the second cooling path portion (low-pressure side second cooling path portion) R2i in the cooling path R.

[0126] (Overall structure of cooling circuit R)

[0127] Next, refer to Figures 16-19 The overall structure of the cooling circuit R will be explained. Figure 16 This is a view of the frame section 20 from the high-voltage side. Figure 17 This is a view of the frame section 20 from the low-pressure side. Additionally, Figure 18 , Figure 19 This is a diagram showing the overall structure of the cooling path R.

[0128] As described above, the openings S1 to S4 that appear on each end face of the low-pressure side and the high-pressure side of the first receiving part 5 are closed by liquid-tightly installing the high-pressure side second receiving part 6o or the low-pressure side second receiving part 6i on each end face.

[0129] However, on the side of the high-voltage side second receiving portion 6o, two openings 63 are provided at each end of the high-voltage side second cooling path portion R2o. When the high-voltage side second receiving portion 6o is installed on the high-voltage side end face of the first receiving portion 5, these openings 63 are positioned on that end face to communicate with the first opening S1 and the fourth opening S4, respectively. Therefore, by installing the high-voltage side second receiving portion 6o on the high-voltage side end face of the first receiving portion 5, the first opening S1 at one end of the connecting path portion R3 communicates with one end of the second cooling path portion R2o, and the fourth opening S4 at one end of the additional connecting path portion R4 communicates with the other end of the high-voltage side second cooling path portion R2o.

[0130] Furthermore, on the side of the second receiving portion 6i on the low-pressure side, two openings 63 are provided at each end of the second cooling path portion R2i on the low-pressure side. When the second receiving portion 6i on the low-pressure side is installed on the end face of the first receiving portion 5 on the low-pressure side, these openings 63 are positioned on the end face that communicate with the fourth opening S4 and the second opening S2, respectively. Therefore, by installing the second receiving portion 6i on the end face of the first receiving portion 5 on the low-pressure side, the fourth opening S4 at the other end of the connecting path portion R4 is connected to one end of the second cooling path portion R2i on the low-pressure side, and the second opening S2 at one end of the first cooling path portion R1 is connected to the other end of the second cooling path portion R2i on the low-pressure side.

[0131] Thus, the connecting path R3, the high-voltage side second cooling path R2o, the additional connecting path R4, the low-voltage side second cooling path R2i, and the first cooling path R1 are connected in series to form a cooling path R that is a single path without branches in the middle (i.e., without branches).

[0132] At both ends of the cooling path R, a cooling medium inlet Rs or an outlet Re is provided. That is, a cooling medium inlet Rs is provided at the end of the connecting section R3 of the cooling path R, and a cooling medium outlet Re is provided at the end of the first cooling path section R1.

[0133] In this configuration, the cooling medium introduced from the inlet Rs flows into the high-pressure side second cooling channel section R2o through the connecting channel section R3 and flows there. The high-pressure side second cooling channel section R2o is provided inside the high-pressure side second receiving portion 6o in such a way that it substantially surrounds the receiving through hole 61 of the receiving bearing 3 in the circumferential direction. Therefore, by allowing the cooling medium to pass through here, heat dissipation is achieved from the bearing 3 side on the high-pressure side. Furthermore, by providing the second cooling channel section R2o in the high-pressure side second receiving portion 6o, the high-pressure side second receiving portion 6o functions as a heat-blocking component by allowing the cooling medium to pass through here. That is, for example, if there is a heat source (e.g., high-temperature air G2 compressed and heated by the rotation of the high-pressure side rotating blade 92) on the outside of the frame portion 20 and on the high-pressure side of the rotating shaft 2, at least a portion of the heat conducted from the heat source G2 can be blocked by the high-pressure side second receiving portion 6o.

[0134] The cooling medium, which draws heat from the bearing 3 side on the high-pressure side by flowing through the second cooling path section R2o on the high-pressure side, then flows into the second cooling path section R2i on the low-pressure side through the additional connecting path section R4 and flows there. The second cooling path section R2i on the low-pressure side is provided inside the second receiving portion 6i on the low-pressure side, in a manner that substantially surrounds the receiving through hole 61 of the receiving bearing 3 in the circumferential direction. Therefore, by allowing the cooling medium to pass through here, heat dissipation occurs from the bearing 3 side on the low-pressure side. Furthermore, by providing the second cooling path section R2i on the low-pressure side, the second receiving portion 6i on the low-pressure side functions as a heat-blocking component by allowing the cooling medium to pass through here. That is, for example, if there is a heat source (e.g., high-temperature air G1 compressed and heated by the rotation of the low-pressure side rotating blade 91) on the outside of the frame portion 20 and on the low-pressure side of the rotating shaft 2, at least a portion of the heat conducted from the heat source G1 can be blocked by the second receiving portion 6i on the low-pressure side.

[0135] The cooling medium that draws heat from the bearing 3 side on the low-pressure side by flowing through the second cooling path section R2i on the low-pressure side then flows into the first cooling path section R1 and flows there. Similar to the first embodiment, the first cooling path section R1 is arranged inside the first receiving portion 5 as a serpentine path that encompasses the entire peripheral wall portion surrounding the receiving space 51. Therefore, by allowing the cooling medium to flow there, the entire peripheral wall portion surrounding the receiving space 51 is scanned by the cooling medium, resulting in sufficient heat dissipation from the outer periphery of the main body 10. The cooling medium flowing through the first cooling path section R1 is discharged from the outlet Re.

[0136] Figure 21(b) schematically illustrates the configuration of the cooling path R in this embodiment. As shown here, the cooling path R includes a first cooling path portion R1 passing through the interior of the first receiving portion 5, and second cooling path portions R2o and R2i passing through the interiors of the second receiving portions 6o and 6i on the high-pressure side and the low-pressure side, respectively. Therefore, heat is dissipated from the outer periphery of the main body 10 and from the bearing 3 on the high-pressure side and the low-pressure side by the cooling medium flowing through each cooling path portion R1, R2o, and R2i. In addition, each of the second receiving portions 6o and 6i on the high-pressure side and the low-pressure side can function as a heat-blocking component. That is, by blocking at least a portion of the heat conducted from the heat sources G1 and G2 located on the outside of the frame portion 20 and on the shaft ends of the rotating shaft 2, the temperature rise of the main body 10 (especially the bearings 3 on the high-pressure side and the low-pressure side) can be suppressed.

[0137] Furthermore, similar to the first embodiment, since the cooling path is a single, unbranched path from the inlet Rs to the outlet Re, the flow rate of the cooling medium in each part of the cooling path R remains constant even if the state of the cooling medium supplied from the inlet Rs changes. That is, a constant flow rate of refrigerant can be ensured to circulate throughout the entire cooling path R. Therefore, the thermal blocking performance of each of the second containment portions 6o and 6i on both the high-pressure and low-pressure sides is stably maintained. In other words, at least a portion of the heat conducted from each heat source G1 and G2 can be stably blocked, sufficiently suppressing the temperature rise of each bearing 3 on both the high-pressure and low-pressure sides.

[0138] For example, such as Figure 22C As shown, it is also possible to consider branching the cooling path from the inlet Rs to the outlet Re into a portion R1 passing through the interior of the first receiving portion 5, a portion R2o passing through the interior of the high-pressure side second receiving portion 6, and a portion R2i passing through the interior of the low-pressure side second receiving portion 6i. In this configuration, heat dissipation is achieved from both the outer periphery of the main body 10 and the bearings 3 on both the high-pressure and low-pressure sides. However, in this configuration, when the state of the cooling medium supplied from the inlet Rs changes, the flow rate in each branch of the cooling path varies erratically depending on the flow resistance of that branch. Therefore, it is difficult to stably maintain the heat-blocking performance of each of the second receiving portions 6o and 6i on the high-pressure and low-pressure sides. Naturally, the more branches there are, the more difficult it is to maintain stability. Thus, in Figure 22C The cooling path shown in the middle branch cannot achieve the same effect as the cooling path R in this embodiment.

[0139] <2-3. Effects>

[0140] The rotary motor 200 according to this embodiment can also achieve the same effect as the rotary motor 100 of the first embodiment.

[0141] In particular, in the rotary motor 200 of this embodiment, the second receiving portions 6 are respectively provided on one side and the other side of the axial direction of the first receiving portion 5, and the second cooling passage portion R2 is provided on both sides of the two second receiving portions 6. In the case where the rotary motor 100 is mounted, for example, in a multi-stage compressor ( Figure 20 When heat sources (air that has become hot due to compression) G1 and G2 are present on the outside of the frame portion 20 and on both the high-pressure side and the low-pressure side of the rotating shaft 2, by providing second cooling path portions R2 in each of the second receiving portions 6 (high-pressure side second receiving portion 6o and low-pressure side second receiving portion 6i) disposed on the high-pressure side and the low-pressure side, at least a portion of the heat conducted from these heat sources G1 and G2 can be blocked by each of the second receiving portions 6o and 6i. In addition, according to this configuration, heat can be dissipated from both of the two bearings 3 disposed on both sides of the rotating shaft 2, thus achieving particularly high heat dissipation performance.

[0142] <3. Variations>

[0143] In the above embodiments, the shape and formation of each portion R1 to R4 included in the cooling path R are not limited to the embodiments illustrated above. For example, in the above embodiments, one or both of the connecting path portion R3 and the additional connecting path portion R4 may be formed using external piping or the like. Alternatively, the inlet Rs may be provided in the second receiving portion 6, omitting the connecting path portion R3. Furthermore, for example, in the above embodiments, the first cooling path portion R1 is a serpentine path with repeated straight sections extending axially, but the first cooling path portion R1 may also be a serpentine path with repeated straight sections extending circumferentially.

[0144] In the second embodiment, the high-pressure side second cooling path portion R2o is located upstream of the low-pressure side second cooling path portion R2i, but this can also be reversed. That is, the connecting path portion R3, the low-pressure side second cooling path portion R2i, the additional connecting path portion R4, the high-pressure side second cooling path portion R2o, and the first cooling path portion R1 can be connected in series to form a cooling path R that does not branch in the middle.

[0145] In the embodiments described above, the configuration of the main body 10 is not limited to the configuration illustrated above. For example, the rotor 1 may also have a configuration in which multiple electromagnetic steel plates are stacked axially. Furthermore, for example, in the embodiments described above, the portion of the coil wire 42a that protrudes towards the axial end face of the stator core 41 is designed to be sealed with resin based on stamping; however, this protruding portion may also be sealed with resin without stamping. Additionally, for example, the main body may also be configured as an outer rotor type with a rotor disposed on the outside of the stator.

[0146] In the above embodiments, the rotary motors 100 and 200 do not necessarily need to be mounted on a multi-stage compressor. That is, the present invention can be applied to rotary motors mounted on multi-stage compressors, and of course, it can also be applied to various other rotary motors.

[0147] Other components may also be modified in various ways without departing from the spirit of the invention.

[0148] Explanation of reference numerals in the attached figures

[0149] 1. Rotor

[0150] 2 Rotation axis

[0151] 3 bearings

[0152] 4. Stator

[0153] 5 First Reception Section

[0154] 6 Second Reception Section

[0155] 7 cover

[0156] 6i Low-pressure side second housing

[0157] 6o High-voltage side second housing

[0158] 10 Main Body

[0159] 20. Frame section

[0160] 51. Capacity

[0161] 52 Hollow Space (Cylindrical Space)

[0162] 53. Long strip partition

[0163] 54 Short strip divider

[0164] 55 points

[0165] 61 Accommodating through hole

[0166] 62. Hollow space (C-shaped space)

[0167] 63 Extended Space

[0168] 64 Opening

[0169] 100, 200 rotary motors

[0170] R cooling path

[0171] R1 First Cooling Circuit Section

[0172] R2 Second Cooling Circuit

[0173] R2i Low-pressure side second cooling circuit section

[0174] R2o High-voltage side second cooling circuit section

[0175] R3 Connecting Path Part

[0176] R4 Added Connectivity Section

[0177] Rs import port

[0178] Re Export Port

Claims

1. A rotary electric motor comprising: a main body having a rotor and a stator; and a frame having the main body housed therefrom; characterized in that, The frame portion includes: A first receiving portion surrounds the main body portion circumferentially; The second receiving part houses the bearing for rotatably supporting the rotating shaft; The frame portion has a cooling path that leads from the inlet of the cooling medium to the outlet of the cooling medium without branching along the way. The cooling path comprises a first cooling path portion passing through the interior of the first receiving portion and a second cooling path portion passing through the interior of the second receiving portion. The second cooling path section has two extension spaces and a C-shaped space. The extension spaces are connected to the first cooling path section and protrude radially inward compared to the first cooling path section. The C-shaped space is connected to both ends of the two extension spaces and is a C-shaped structure that generally surrounds the rotation axis.

2. The rotary motor as described in claim 1, characterized in that, The first receiving portion is provided with a hollow space that surrounds the main body in the circumferential direction and opens at its axial end. The open end of the hollow space is closed by the second receiving portion. At least a portion of the hollow space forms the first cooling path section.

3. The rotary motor as described in claim 1 or 2, characterized in that, The second receiving portion is respectively disposed on one side and the other side of the first receiving portion along its axial direction. The second cooling path section is located in only one of the two second accommodating sections.

4. The rotary motor as described in claim 1 or 2, characterized in that, The second receiving portion is respectively disposed on one side and the other side of the first receiving portion along its axial direction. The second cooling path is located on both sides of the two second receiving sections.

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