Rotating electrical machine

Abstract

A rotary electric machine (1) includes a rotor (11), a stator (12), and a housing (3) having a flow path portion (30). The flow path portion (30) includes an inner peripheral wall (32), an outer peripheral wall (33), and a partition wall portion (37). The inner peripheral wall (32) is in contact with an outer peripheral surface (12a) of the stator (12). The outer peripheral wall (33) is disposed on an outer side in a radial direction of the inner peripheral wall (32). The partition wall portion (37) is provided at a part in a circumferential direction and connects the inner peripheral wall (32) and the outer peripheral wall (33) in the radial direction. The stator (12) includes a yoke portion (21) and a plurality of tooth portions (22). The yoke portion (21) extends in the circumferential direction. The plurality of tooth portions (22) extend from the yoke portion (21) to an inner side in the radial direction. The yoke portion (21) includes a first portion (21a) and a second portion (21b). The first portion (21a) is connected to each tooth portion (22). The second portion (21b) is disposed between two first portions (21a) adjacent to each other in the circumferential direction. The partition wall portion (37) faces the second portion (21b) in the radial direction.

Description

Technical Field

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

[0002] The rotary electric motor described in Patent Documents 1 and 2 includes a rotor, a stator disposed radially outward of the rotor, and a housing containing the stator. The stator has a cylindrical yoke and teeth extending radially inward from the yoke. The rotary electric mechanism generates a rotating magnetic field by passing current through a coil wound around the teeth, and rotates the rotor by the magnetic force generated by the rotating magnetic field.

[0003] A refrigerant flow path for cooling the stator and other components is formed within the housing. The housing, as a component forming the refrigerant flow path, has an inner peripheral wall that contacts the outer peripheral surface of the stator, an outer peripheral wall disposed radially outward of the inner peripheral wall, and a partition wall portion disposed radially between the inner and outer peripheral walls. The partition wall portion is located in a circumferential direction within the housing and connects the inner and outer peripheral walls. An inlet for the refrigerant flow path is formed near the partition wall portion, and an outlet for the refrigerant flow path is formed on the side opposite to the inlet, across the partition wall portion. The refrigerant flowing into the refrigerant flow path through the inlet flows approximately one revolution within the refrigerant flow path before flowing out through the outlet.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-46853

[0007] Patent Document 2: Japanese Patent Application Publication No. 2014-236613 Summary of the Invention

[0008] The technical problem to be solved by the invention

[0009] In the aforementioned rotary motor, when the rotor rotates, magnetic force acts intermittently between the rotor and the teeth, causing the stator to vibrate. If this vibration is transmitted from the stator to the inner peripheral wall, and then, for example, via a partition, from the inner peripheral wall to the outer peripheral wall, noise will be generated due to the vibration of the outer peripheral wall. As a noise countermeasure, one could consider not providing a partition to suppress the transmission of vibration from the inner peripheral wall to the outer peripheral wall. However, in this case, a short-circuit path is formed from the inlet to the outlet, raising concerns that a large portion of the refrigerant may easily flow into the short-circuit path. Therefore, the amount of refrigerant that originally flowed through the refrigerant flow path is significantly reduced, potentially leading to a substantial impairment of the cooling function.

[0010] The object of the present invention is to suppress the transmission of stator vibration to the outer peripheral wall even when the inner and outer peripheral walls of the housing are connected by a partition.

[0011] means for solving technical problems

[0012] The rotary electric motor of the first invention comprises: a rotor capable of rotating about a predetermined axial direction; a stator disposed radially outside the rotor; and a housing having a flow path portion forming a refrigerant flow path and housing the rotor and the stator. The rotary electric motor is characterized in that the flow path portion has: an inner peripheral wall in contact with the outer peripheral surface of the stator; an outer peripheral wall disposed radially outside the inner peripheral wall and configured to form the refrigerant flow path between the inner peripheral wall and the inner peripheral wall; and a partition wall portion disposed in a portion of a circumferential direction orthogonal to both the axial and radial directions, and connecting the inner peripheral wall and the outer peripheral wall radially. The stator has: a cylindrical yoke portion; and a plurality of teeth arranged circumferentially and extending radially inward from the yoke portion. The yoke portion includes: a first portion connected to each tooth portion; and a second portion disposed between two adjacent first portions in the circumferential direction. The partition wall portion faces the second portion radially.

[0013] The second part of the yoke is the portion disposed between the first parts that are circumferentially adjacent to each other. In other words, the second part is the portion that is radially thinner than the portion where the teeth in the stator connect to the first part. That is, the second part has low bending stiffness. In this invention, the partition wall portion faces the second part radially. In other words, the second part is sandwiched between the teeth and the partition wall portion. In this structure, when the stator vibrates with the operation of the rotating motor, the second part functions as a weak spring element by deformation, thereby suppressing the transmission of stator vibration to the inner peripheral wall of the housing. Thus, the transmission of vibration to the outer peripheral wall of the housing via the partition wall portion can be suppressed. Therefore, even when the inner and outer peripheral walls of the housing are connected by the partition wall portion, the transmission of stator vibration to the outer peripheral wall can be suppressed.

[0014] The rotating motor of the second invention is characterized in that, in the first invention, the partition portion faces the center of the second portion in the radial direction.

[0015] The circumferential center portion of Part 2 is furthest from the location where the teeth are located, therefore it has the lowest rigidity and is most prone to deformation. Therefore, especially when the partition wall faces the aforementioned center portion radially, the vibration damping function based on Part 2 can be most effectively utilized. Thus, vibration transmission via the partition wall to the outer peripheral wall can be effectively suppressed. Attached Figure Description

[0016] Figure 1 This is a top view of the rotary motor involved in Embodiment 1 of this implementation.

[0017] Figure 2 (a) is along Figure 1 A sectional view cut along line II(a)-II(a). Figure 2 (b) is Figure 1 View II(b)

[0018] Figure 3 This is a top view of the rotary motor involved in Embodiment 2.

[0019] Figure 4 This is a top view of the rotary electric machine involved in the comparative example.

[0020] Figure 5 It is a curve representing the vibration amplitude of the outer peripheral wall. Detailed Implementation

[0021] Next, embodiments of the present invention will be described. Furthermore, [the following will be discussed]. Figure 1 The vertical direction of the paper ( Figure 2 The vertical direction on the paper in (a) and (b) is defined as the axial direction. Hereinafter, the direction orthogonal to the axial direction, i.e., the radial direction of rotor 11 (described later), will be simply referred to as the radial direction. The direction orthogonal to both the axial and radial directions is called the circumferential direction.

[0022] (Rotary motor)

[0023] First, refer to Figure 1 , Figure 2 (a) Figure 2 (b) The structure of the rotary motor 1 involved in this embodiment will be described. Figure 1 This is a top view of rotary motor 1. Figure 2 (a) is along Figure 1 A sectional view cut along line II(a)-II(a). Figure 2 (b) is Figure 1 View II(b)

[0024] like Figure 1 As shown, the rotary electric machine 1 includes a motor 2 and a housing 3. The motor 2 is, for example, a known AC motor. The motor 2 has a rotor 11 capable of rotating about the aforementioned axial direction as the rotation axis and a stator 12 disposed radially outward of the rotor 11. The motor 2 is configured such that the rotor 11 rotates due to the rotating magnetic field generated when an alternating current flows in a coil (not shown) wound around the stator 12.

[0025] The rotor 11 is, for example, a generally cylindrical component with permanent magnets (not shown). The rotor 11 is disposed radially inside the stator 12. A rotating shaft 13 is embedded in the rotor 11. However, the structure of the rotor 11 is not limited to this. For example, the rotor 11 may have multiple salient poles protruding in a direction orthogonal to the direction of the rotating shaft (i.e., the motor 2 may be, for example, a switched reluctance motor). The stator 12 is, for example, a generally cylindrical component made of magnetic components such as carbon steel. The stator 12 is disposed radially outside the rotor 11. The stator 12 is embedded in the housing 3. The stator 12 has a yoke 21 and a plurality of teeth 22, the yoke 21 being a generally cylindrical shape formed throughout the circumference, and the plurality of teeth 22 extending radially inward from a portion of the circumference of the yoke 21. In other words, the yoke 21 and the teeth 22 are integrally formed, with a portion of the circumference of the yoke 21 connected to the teeth 22. In this embodiment, the six teeth 22 are arranged at approximately equal intervals in the circumferential direction. The yoke 21 includes a portion (first portion 21a) connected to each tooth 22 and a portion (second portion 21b) disposed between adjacent first portions 21a in the circumferential direction. The second portion 21b is radially thinner than the portion in the stator 12 where the first portion 21a connects to the tooth 22. In this embodiment, six second portions 21b are formed. In this embodiment, the circumferential and radial dimensions of all second portions 21b are approximately equal.

[0026] A coil (not shown) is wound around each tooth 22. The coil is electrically connected to a power supply device (not shown). The power supply device supplies power to the motor 2 to make alternating current flow through the coil. More specifically, the power supply device supplies power in such a way that alternating current of the same phase flows through a pair of coils wound on opposite sides of a pair of teeth 22 separated from each other by the rotor 11. In this embodiment, the power supply device supplies power in such a way that three alternating currents with phases 120 degrees apart flow through three pairs of coils respectively (typical three-phase alternating current).

[0027] In this motor 2, if electricity is supplied to the coil as described above, a rotating magnetic field that rotates circumferentially at a predetermined period is generated, and a magnetic force is generated between the magnetic poles of the rotating magnetic field and the rotor 11. As a result, the rotor 11 rotates together with the rotating shaft 13 in a manner that follows the rotating magnetic field.

[0028] The housing 3 is a casing component that houses the motor 2 and has an opening on one side in the axial direction. The housing 3 is, for example, die-cast from an aluminum alloy using a conventional die-casting method. However, the material of the housing 3 does not necessarily have to be aluminum alloy. For example, the housing 3 can be formed from a metal such as iron, or from a component other than a metal. Furthermore, the housing 3 does not necessarily have to be formed by die-casting; it can be formed by other known casting methods. The housing 3 has a flow path 30, which forms a refrigerant flow path 31 for cooling the refrigerant flow of the motor 2. Figure 1 and Figure 2 (a) Figure 2 As shown in (b), the flow path 30 has an inner peripheral wall 32, an outer peripheral wall 33, a bottom 34, an inlet 35, an outlet 36, and a partition wall 37.

[0029] The inner peripheral wall 32 extends axially and is formed throughout the entire circumference. The inner peripheral surface 32a of the inner peripheral wall 32 contacts the outer peripheral surface 12a of the stator 12. Thus, the stator 12 is fitted into the inner peripheral wall 32 of the housing 3. Similarly, the outer peripheral wall 33 extends axially and is formed throughout the entire circumference. The outer peripheral wall 33 is disposed radially outside the inner peripheral wall 32 and is arranged radially with the inner peripheral wall 32. The outer peripheral wall 33 is provided with a radially spaced gap of a predetermined size from the inner peripheral wall 32. The size of the gap is, for example, approximately constant in the circumferential direction. The bottom 34 is disposed at the other end of the housing 3 in the axial direction and connects the inner peripheral wall 32 and the outer peripheral wall 33 radially. The inner peripheral wall 32, the outer peripheral wall 33, and the bottom 34 are formed in a circumferential manner to form a cross-section that is approximately U-shaped (see reference). Figure 2 (a)) The refrigerant flow path 31. In other words, the refrigerant flow path 31 is formed between the inner peripheral wall 32 and the outer peripheral wall 33.

[0030] The inlet 35 is a portion having an inlet 41 for supplying refrigerant to the refrigerant flow path 31. For example... Figure 1 As shown, the inlet 41 opens at a predetermined position in the circumferential direction on the inner circumferential surface 33a of the outer peripheral wall 33. Furthermore, a supply pipe portion 42 protruding radially outward is provided on the outer peripheral wall 33. A through hole (supply flow path 43) including the inlet 41 is formed from the front end of the supply pipe portion 42 along the inner circumferential surface 33a of the outer peripheral wall 33. The supply flow path 43 is connected to the refrigerant flow path 31 via the inlet 41. In this embodiment, the supply flow path 43 extends in a direction substantially orthogonal to the axial direction, but is not limited thereto.

[0031] The outlet portion 36 is a portion having an outlet 44 for discharging refrigerant from the refrigerant flow path 31. Similar to the inlet 41, the outlet 44 opens into the inner circumferential surface 33a of the outer peripheral wall 33. The circumferential position of the outlet 44 differs from the circumferential position of the inlet 41 (the aforementioned designated position). Furthermore, a discharge pipe portion 45 protruding radially outward is provided on the outer peripheral wall 33. A through hole (discharge flow path 46) including the outlet 44 is formed from the inner circumferential surface 33a of the outer peripheral wall 33 to the front end of the discharge pipe portion 45. The discharge flow path 46 is connected to the refrigerant flow path 31 via the outlet 44. In this embodiment, when viewed axially, the inlet portion 35 and the outlet portion 36 are configured approximately linearly symmetrically across the partition wall portion 37 (see reference). Figure 1 Furthermore, the supply flow path 43 and the discharge flow path 46 are configured to be substantially parallel, but are not limited thereto.

[0032] like Figure 1 As shown, the refrigerant flow path 31 is roughly divided into two parts, for example, by an imaginary straight line L1 extending radially and passing through the center of the inlet 41 and an imaginary straight line L2 extending radially and passing through the center of the outlet 44. That is, the refrigerant flow path 31 is divided into a first flow path 51 and a second flow path 52. The first flow path 51 has a circumferential length of a predetermined length from the inlet 41 to the outlet 44, while the second flow path 52 has a circumferential length shorter than the predetermined length from the inlet 41 to the outlet 44. The first flow path 51 occupies approximately a full circumference of the refrigerant flow path 31. In this embodiment, the radial width of the first flow path 51 is approximately constant in the circumferential direction. The second flow path 52 is the remaining portion of the refrigerant flow path 31 after removing the first flow path 51.

[0033] The partition 37 is a portion used to suppress refrigerant flowing into the refrigerant flow path 31 through the inlet 41 from flowing out of the outlet 44 via the short second flow path 52. For example... Figure 1 As shown, the partition wall portion 37 is disposed in a portion of the circumferential direction (the middle portion of the second flow path 52), and is radially disposed between the inner peripheral wall 32 and the outer peripheral wall 33. The partition wall portion 37 is integrally formed with the inner peripheral wall 32 and the outer peripheral wall 33, and extends axially (from...) Figure 2 (a) The partition 37 connects the inner peripheral wall 32 and the outer peripheral wall 33. That is, the second flow path 52 is divided into two parts by the partition 37. Thus, when the refrigerant flowing into the refrigerant flow path 31 through the inlet 41 flows towards the second flow path 52, the partition 37 can prevent the refrigerant from directly reaching the outlet 44. In addition, the partition 37 can be provided as a different component from the inner peripheral wall 32 and the outer peripheral wall 33.

[0034] Furthermore, a generally circular cover member 38 is fixed to one end of the housing 3 along the axial direction, for example by a fixing tool not shown. Thus, the refrigerant flow path 31 is sealed except for the inlet 41 and the outlet 44.

[0035] In the refrigerant flow path 31 described above, most of the refrigerant flowing in through inlet 41 flows toward the first flow path 51, where it flows approximately circumferentially throughout the entire circumference and exits through outlet 44. Thus, through the refrigerant flow, the housing 3 is cooled by the refrigerant, and consequently, the motor 2, which is in contact with the housing 3, is cooled by heat conduction.

[0036] Here, when the rotor 11 rotates, magnetic force acts intermittently between the teeth 22 of the stator 12 and the rotor 11. As a result, the teeth 22 vibrate, and this vibration is transmitted to the entire stator 12. If this vibration is transmitted from the stator 12 to the inner peripheral wall 32, and then, for example, via the partition 37, from the inner peripheral wall 32 to the outer peripheral wall 33, the outer peripheral wall 33 may vibrate, potentially generating noise. As a noise countermeasure, one could consider not providing the partition 37 to suppress the transmission of vibration from the inner peripheral wall 32 to the outer peripheral wall 33. However, in this case, the second flow path 52 is short-circuited between the inlet 41 and the outlet 44, raising concerns that a large portion of the refrigerant might easily flow into the second flow path 52. Therefore, the amount of refrigerant flowing through the first flow path 51 is significantly reduced, potentially leading to a substantial impairment of the cooling function.

[0037] Therefore, even when the inner peripheral wall 32 and the outer peripheral wall 33 are connected by the partition wall portion 37, in order to suppress the transmission of vibration of the stator 12 to the outer peripheral wall 33 of the housing 3, the inventors of this application focused on the positional relationship between the stator 12 and the partition wall portion 37. Specifically, the inventors of this application focused on the relationship between the circumferential position of the second portion 21b in the yoke portion 21 of the stator 12 and the circumferential position of the partition wall portion 37. As described above, the second portion 21b is two first portions 21a arranged in the yoke portion 21 that are adjacent to each other in the circumferential direction (for example, refer to...). Figure 1 The portion 21b is the part between the first portions 63 and 64 that are respectively connected to the teeth 61 and 62. More specifically, for example, the portion of the outer edge of the tooth 61 that extends generally radially and is closer to the tooth 62 in the circumferential direction when viewed axially is defined as the outer edge 61a. Similarly, the portion of the outer edge of the tooth 62 that extends generally radially and is closer to the tooth 61 in the circumferential direction when viewed axially is defined as the outer edge 62a. The second portion 21b is, for example, the portion of the yoke 21 that is held between the extension line L3 of the outer edge 61a and the extension line L4 of the outer edge 62a of the tooth 62. Hereinafter, the positional relationship between the second portion 21b and the partition wall portion 37 in Embodiments 1, 2, and the comparative example described later will be explained.

[0038] (Example 1)

[0039] refer to Figure 1The circumferential positional relationship between the second portion 21b of the stator 12 and the partition wall portion 37 in the rotary electric motor 1 of Embodiment 1 will be described. In Embodiment 1, the partition wall portion 37 is confined to the inside of the second portion 21b in the circumferential direction. In other words, the partition wall portion 37 faces the second portion 21b to each other in the radial direction. In other words, the second portion 21b is sandwiched between the partition wall portion 37 and the teeth 22 that vibrate by intermittent magnetic force when the motor 2 operates.

[0040] More specifically, the partition wall 37 is radially aligned with the circumferential center of the second part 21b (see reference). Figure 1 The straight line L5) faces each other. In other words, the circumferential center of the second part 21b is circumferentially restricted to the inside of the partition wall 37. More precisely, the position of the circumferential center of the second part 21b is the same as the circumferential center of the partition wall 37 (see reference). Figure 1 The position of the straight line L6 is consistent with that of the line L6.

[0041] By adopting this structure, the inventors believe that, based on the following principle, the vibration of the stator 12 can be suppressed from being transmitted to the outer peripheral wall 33 of the housing 3. Specifically, when the stator 12 vibrates, the radially thin second portion 21b deforms and functions as a weak spring element, thereby suppressing the transmission of the stator 12's vibration to the inner peripheral wall 32 of the housing 3. Thus, the vibration is suppressed from being transmitted to the outer peripheral wall 33 of the housing 3 via the partition wall portion 37. In this way, the second portion 21b provides a vibration damping function. Furthermore, the circumferentially oriented center portion of the second portion 21b is furthest from the location where the toothed portion 22 is provided, therefore it has the lowest rigidity and is most easily deformed. Therefore, when the partition wall portion 37 faces the aforementioned center portion radially, the vibration damping function based on the second portion 21b is most effectively performed.

[0042] (Example 2)

[0043] refer to Figure 3 The circumferential positional relationship between the second part 21b of the stator 12 and the partition wall 37 in the rotary electric motor 1a of Embodiment 2 will be described. As with Embodiment 1, the partition wall 37 faces the second part 21b radially. However, as a difference from Embodiment 1, the partition wall 37 is not aligned with the circumferential center of the second part 21b (see reference). Figure 3 The straight line L5) faces each other. Specifically, in embodiment 2, the circumferential center of the second part 21b is offset by 15 degrees from the circumferential center of the partition wall 37. In this structure, the inventors of this application believe that the vibration transmitted to the inner peripheral wall 32 of the housing 3 due to the deformation of the second part 21b is suppressed to some extent when the stator 12 vibrates.

[0044] (Comparative Example)

[0045] refer to Figure 4The circumferential positional relationship between the second part 21b of the stator 12 and the partition wall 37 in the comparative example rotary electric motor 1b will be explained. In the comparative example, the partition wall 37 does not face the second part 21b radially. The partition wall 37 faces the first part 21a of the yoke 21 radially. In this structure, the vibration of the tooth 22 is not transmitted to the inner peripheral wall 32 via the second part 21b, but is transmitted to the outer peripheral wall 33 via the partition wall 37. Therefore, the inventors of this application believe that the outer peripheral wall 33 experiences greater vibration.

[0046] (Analysis of vibration amplitude of the outer peripheral wall)

[0047] The inventors of this application analyzed the magnitude of the vibration of the outer peripheral wall 33 in Embodiments 1, 2, and the comparative example through simulation. The analysis conditions (e.g., the size of the tooth 22, the size of the partition wall 37, the amplitude and frequency of the current flowing through the coil) were the same in Embodiments 1, 2, and the comparative example, except for the circumferential positional relationship between part 21b and the partition wall 37. Based on this, the inventors of this application conducted simulations related to the deformation of the stator 12 and the housing 3 in Embodiments 1, 2, and the comparative example. Furthermore, based on the simulation results, the frequency components of the vibration amplitude of the outer peripheral wall 33 were calculated.

[0048] refer to Figure 5 The graph shown illustrates the results of the above analysis. This graph represents the frequency components of the vibration amplitude. The horizontal axis represents frequency, and the vertical axis represents vibration amplitude. In the comparative example (reference...), Figure 5 In the solid line (referring to the frequency domain), the vibration amplitude tends to be significantly larger in the frequency domain from 8000Hz to 11000Hz compared to other frequency domains. On the other hand, in Example 1 (referring to the solid line), the vibration amplitude tends to be significantly larger in the frequency domain from 8000Hz to 11000Hz. Figure 5 In the dashed line (referring to the example example), the analysis showed a significant reduction (approximately halved or more) in the vibration amplitude in the frequency domain of 8000Hz to 11000Hz compared to the comparative example. That is, in Example 1, it was found that the effect of suppressing the vibration of the outer peripheral wall 33 was significant. Furthermore, in Example 2 (referring to the example example example),... Figure 5 In the single-dotted line (the above-mentioned frequency domain vibration amplitude was also found to be smaller overall (approximately reduced by 20% or more) compared to the vibration amplitude in the comparative example. That is, in Example 2, it can be seen that a vibration suppression effect was also obtained compared to the comparative example.

[0049] As described above, when the stator 12 vibrates, the second part 21b functions as a weak spring element by deformation, thereby suppressing the transmission of vibration to the inner peripheral wall 32 of the housing 3. This also suppresses the transmission of vibration to the outer peripheral wall 33 of the housing 3 via the partition wall 37. Therefore, even when the inner peripheral wall 32 and the outer peripheral wall 33 of the housing 3 are connected by the partition wall 37, the transmission of vibration of the stator 12 to the outer peripheral wall 33 can still be suppressed.

[0050] Furthermore, the circumferential center portion of part 21b is furthest from the location where the toothed portion 22 is provided, thus exhibiting the lowest rigidity and being most prone to deformation. Therefore, especially when the partition wall portion 37 faces the aforementioned center portion radially, the vibration damping function based on part 21b can be most effectively utilized. Consequently, vibration transmission to the outer peripheral wall 33 via the partition wall portion 37 can be effectively suppressed.

[0051] Next, modified examples of the described embodiment will be described. However, parts having the same structure as the described embodiment will be labeled with the same symbols, and their descriptions will be omitted as appropriate.

[0052] (1) In the embodiment described above, the number of teeth 22 of the stator 12 is set to 6, and three-phase AC current flows through the coil, but it is not limited to this. The number of teeth 22 may not be 6. Furthermore, current other than three-phase AC (e.g., unidirectional AC) may flow through the coil. Furthermore, the teeth 22 need not necessarily be arranged at equal intervals in the circumferential direction. That is, the circumferential dimensions of the plurality of second portions 21b may be different from each other. In this case, the inner side of the circumferential partition 37 of the second portion 21b with the lowest rigidity (e.g., the longest in the circumferential direction) among the plurality of second portions 21b may be configured to restrict the partition wall portion 37 in the circumferential direction. Furthermore, the size of all teeth 22 need not necessarily be the same.

[0053] (2) In the embodiment described above, motor 2 is an AC motor, but it is not limited to this. The present invention can also be applied to DC motors.

[0054] (3) In the described embodiment, a rotary motor 1 or the like is provided with a motor 2 for rotating the rotating shaft 13, but it is not limited to this. For example, instead of the motor 2, a generator can be provided that rotates the rotating shaft 13 by external force, thereby generating an electromotive force in the coil through electromagnetic induction. Alternatively, the motor 2 can be used as a generator. In this case, the stator 12 may vibrate because a magnetic force is intermittently generated between the rotor 11 and the tooth 22, so it is effective to arrange the partition wall 37 to face each other radially with the second part 21b.

[0055] Symbol Explanation

[0056] 1-Rotating motor, 3-House, 11-Rotor, 12-Stator, 12a-Outer peripheral surface, 21-Yoke, 21a-Part 1, 21b-Part 2, 22-Tooth, 30-Flow path, 31-Refrigerant flow path, 32-Inner peripheral wall, 33-Outer peripheral wall, 37-Bridging wall.

Claims

1. A rotary electric motor, comprising: The rotor is capable of rotating about a specified axial direction. The stator is disposed radially outside the rotor; and The housing has a flow path portion forming a refrigerant flow path, is open on one side in the axial direction and closed on the other side, and houses the rotor and the stator. The rotary electric motor is characterized in that, The flow path section has: The inner peripheral wall is in contact with the outer peripheral surface of the stator; An outer peripheral wall, disposed radially outside the inner peripheral wall, and configured to form the refrigerant flow path between itself and the inner peripheral wall; and The bottom is located on the opposite side of the axial direction of the rotor and the stator via an end located on the opposite side of the axial direction of the housing, and connects the inner peripheral wall and the outer peripheral wall in the radial direction; The partition wall is disposed in a portion of the circumferential direction orthogonal to both the axial and radial directions, and connects the inner circumferential wall and the outer circumferential wall in the radial direction. The inner peripheral wall extends along the axial direction and is formed throughout the entire circumference in the circumferential direction. Similarly, the outer peripheral wall extends along the axial direction and is formed throughout the entire circumferential direction, just like the inner peripheral wall. The outer peripheral wall is configured to have a predetermined gap between it and the inner peripheral wall in the radial direction. The size of the gap is approximately constant in the circumferential direction. The axial length of the refrigerant flow path is longer than the axial length of the stator. By fixing the cover component to one end of the housing along its axial direction, the rotor and the stator are housed inside the housing, and the refrigerant flow path is sealed off except for the inlet and outlet. The stator has: A tubular yoke; and Multiple teeth are arranged circumferentially and extend from the yoke toward the radially inward side. The yoke includes: Part 1, connecting to each tooth; and Part 2 is positioned between two adjacent Part 1 portions in the circumferential direction. The partition wall faces the second part, which is thinner than the first part, in the radial direction.

2. The rotary motor according to claim 1, characterized in that, One end of the axial direction of the refrigerant flow path is located closer to one side than one end of the axial direction of the stator, and the other end of the axial direction of the refrigerant flow path is located closer to the other side than the other end of the axial direction of the stator.

3. The rotary motor according to claim 1, characterized in that, The partition wall faces the center of the second part in the radial direction.

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