Rotating electric machine

Abstract

Provided is a rotating electric machine, wherein when the ratio of the cross-sectional area of winding channels adjacent to both sides of a wound section of a winding to the cross-sectional area of slots adjacent to both sides of a tooth section is defined as a channel cross-sectional area ratio, the temperature obtained by subtracting the temperature of a refrigerant flowing through the winding channel from a heat generation temperature of the wound section of the winding if a current has flowed through the wound section of the winding at a predetermined current value is defined as a winding rise temperature, the cross-sectional area obtained by adding the cross-sectional area of an arc-shaped air gap to the cross-sectional area of the winding channels is defined as a total channel cross-sectional area with the arc-shaped air gap being obtained by dividing the cross-sectional area of an annular air gap between a stator and a rotor by the number of teeth sections, and the ratio of the cross-sectional area of the winding channels to the total channel cross-sectional area is defined as a winding flow rate ratio, the channel cross-sectional area ratio is set to a value greater than the ratio at which the cross-sectional area of the winding channels becomes equal to the cross-sectional area of the arc-shaped air gap, and equal to or less than the ratio at which the winding rise temperature becomes a lower limit value and the winding flow rate ratio becomes an upper limit value.

Description

Rotating electrical machine Cross-reference to related applications

[0001] This application is based on Japanese Application No. 2024-231083 filed on December 26, 2024, claims the benefit of its priority, and all the contents of the patent application are incorporated herein by reference.

[0002] The technology of the present disclosure relates to a rotating electrical machine.

[0003] Conventionally, there is a rotating electrical machine including a stator and a rotor rotatably provided inside the stator. Also, among this type of rotating electrical machines, there is one in which the stator includes a stator core having a plurality of teeth portions extending radially, an insulator attached to the stator core, and a plurality of winding winding portions wound around the plurality of teeth portions via the insulator (see, for example, Japanese Patent Application Laid-Open No. 2020-120419).

[0004] As a result of the inventors' detailed examination, the following problems have been found. That is, in the rotating electrical machine having the above configuration, if the occupancy ratio of the winding winding portion is low, the output becomes low. On the other hand, if the occupancy ratio of the winding winding portion is high, the output becomes high, but the cross-sectional area of the inter-winding flow path formed between adjacent winding winding portions becomes small, and the flow rate of the refrigerant flowing through the inter-winding flow path decreases. As a result, it becomes difficult to cool the winding winding portion, the temperature of the winding winding portion rises, the resistance of the winding winding portion increases, and consequently, the copper loss increases and the motor efficiency decreases.

[0005] The technology of the present disclosure provides a rotating electrical machine capable of achieving both the occupancy ratio of the winding winding portion and the motor efficiency.

[0006] A rotating electric machine according to one aspect of the technology of the present disclosure comprises a stator and a rotor rotatably mounted inside the stator, wherein the stator comprises a stator core having a plurality of radially extending teeth, an insulator mounted on the stator core, and a plurality of winding sections wound around the plurality of teeth via the insulator, wherein the ratio of the cross-sectional area of ​​the winding flow path adjacent to both sides of the winding section to the cross-sectional area of ​​the slots adjacent to both sides of the teeth is defined as the flow path cross-sectional area ratio, and the heat generated by the winding section when a current of a predetermined value is passed through the winding section is determined from the temperature of the winding section. When the temperature obtained by subtracting the temperature of the refrigerant flowing through the winding passage is defined as the winding rise temperature, and the cross-sectional area obtained by adding the cross-sectional area of ​​the arc-shaped air gap (obtained by dividing the cross-sectional area of ​​the annular air gap between the stator and the rotor by the number of teeth) to the cross-sectional area of ​​the winding passage is defined as the total passage cross-sectional area, and the ratio of the cross-sectional area of ​​the winding passage to the total passage cross-sectional area is defined as the winding flow rate ratio, then the flow rate ratio is set to be greater than the ratio at which the cross-sectional area of ​​the winding passage becomes equal to the cross-sectional area of ​​the arc-shaped air gap, and less than or equal to the ratio at which the winding rise temperature reaches a lower limit and the winding flow rate ratio reaches an upper limit.

[0007] The technology of this disclosure provides a rotating electric machine that can achieve both a high space factor in the winding section and high motor efficiency.

[0008] This is a plan cross-sectional view of a stator according to the first embodiment. This is a plan cross-sectional view of a core member according to the first embodiment. This is a block diagram showing a stator and inverter circuit according to the first embodiment. This is a plan cross-sectional view showing a slot according to the first embodiment. This is a plan cross-sectional view showing a winding flow path according to the first embodiment. This is a graph showing an example of the relationship between the flow path cross-sectional area ratio, winding flow rate ratio, and air gap flow rate ratio according to the first embodiment. This is a graph showing an example of the relationship between the flow path cross-sectional area ratio, heat transfer coefficient, and flow velocity of the refrigerant flowing through the winding flow path according to the first embodiment. This is a graph showing an example of the relationship between the flow path cross-sectional area ratio and the temperature of the refrigerant flowing through the winding flow path according to the first embodiment. This is a graph showing a first example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing a second example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing a third example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing a fourth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing a fifth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing the sixth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing the seventh example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing the eighth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing the ninth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a graph showing the tenth example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio according to the first embodiment. This is a cross-sectional view of a stator component according to the second embodiment. This is an exploded perspective view of a stator component according to the second embodiment. This is an enlarged exploded perspective view of the main part of the stator according to the second embodiment. This is an enlarged plan view of the main part of the stator according to the second embodiment. This is an enlarged cross-sectional view of the main part of the stator according to the third embodiment. This is an enlarged cross-sectional view of the main part of the stator according to the fourth embodiment. This is an enlarged cross-sectional view of the main part of the stator according to the fifth embodiment. This is an enlarged plan view of the main part of the stator according to the first comparative example.This is an enlarged cross-sectional view of the main part of the stator relating to the second comparative example.

[0009] [First Embodiment] First, a first embodiment of the technology of this disclosure will be described.

[0010] As shown in Figure 1, the rotating electric machine M comprises a stator 10 and a rotor 11. The stator 10 is formed in an annular shape, and the rotor 11 is rotatably housed inside the stator 10. The stator 10 and rotor 11 constitute an inner rotor type brushless motor.

[0011] In each figure, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. Furthermore, in the following explanation, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential, radial, axial, and circumferential directions of the stator core 24 are the same as the tangential, radial, axial, and circumferential directions of the stator 10, respectively.

[0012] The stator 10 comprises a plurality of stator components 12. The stator 10 is formed by combining the plurality of stator components 12 in an annular manner in the circumferential direction of the stator 10. Figure 1 shows half of the configuration of a rotating electric machine M, including the stator 10 and rotor 11.

[0013] Each stator component 12 comprises a core member 14, an insulator 16, and a winding section 18. The core member 14 is formed in a T-shape when viewed from the Z direction and has a teeth section 20 and a core back section 22. The core member 14 is formed symmetrically in the tangential direction of the stator 10. The core back section 22 is located radially outward of the stator 10 relative to the teeth section 20. The core back section 22 extends on both sides of the stator 10 in the tangential direction relative to the teeth section 20, and the teeth section 20 extends radially inward from the center of the core back section 22 toward the stator 10.

[0014] The core member 14 is a laminate formed by stacking multiple core sheets in the Z direction. The stator core 24 is constructed by combining the multiple core members 14 in an annular manner in the circumferential direction of the stator core 24. That is, the stator core 24 is formed by multiple core members 14 divided into tooth portions 20. In the state in which the stator core 24 is constructed, the multiple core back portions 22 form an annular portion 26 which is the outer periphery of the stator core 24, and the multiple tooth portions 20 extend radially from the center of the stator core 24.

[0015] The insulator 16 is made of resin. The insulator 16 is installed from the teeth portion 20 to the core back portion 22, insulating the teeth portion 20 and the core back portion 22 from the winding portion 18. The winding portion 18 is wound around the teeth portion 20 via the insulator 16. The winding portion 18 is formed by windings made of copper wire covered with a coating material. In the stator 10 with the above configuration, the winding portion 18 is cooled by the flow of coolant between adjacent winding portions 18. The flow of coolant may be generated by a blower or the like, or it may be generated by the rotation of a fan when the rotating electric machine M is used as a fan motor.

[0016] The stator 10 comprises multiple stator components 12, as well as multiple insulating sheets 40. The multiple insulating sheets 40 are arranged between multiple winding sections 18, insulating adjacent winding sections 18. The insulating sheets 40 are made of resin and extend along the radial direction of the stator 10.

[0017] The rotor 11 is provided with a plurality of rotor magnets 13. The plurality of rotor magnets 13 are arranged at equal intervals along the circumferential direction of the rotor 11. Each rotor magnet 13 has different magnetic poles in the radial direction of the rotor 11. In addition, for adjacent rotor magnets 13, the magnetic poles located on the radially outer side of the rotor 11 are different from each other. As an example, the rotating electric machine M is a rotating electric machine in which the number of plurality of rotor magnets 13 (i.e., the number of plurality of magnetic poles arranged in the circumferential direction of the rotor 11) is 8, and the number of plurality of teeth portions 20 is 12.

[0018] As shown in Figure 2, the teeth portion 20 has a main body portion 21A and a tip portion 21B. The main body portion 21A of the teeth portion 20 is the portion between the tip portion 21B and the base end of the teeth portion 20. The tip portion 21B of the teeth portion 20 is a free end, and the base end of the teeth portion 20 is connected to the core back portion 22. The tip portion 21B of the teeth portion 20 is located on the opposite side of the core back portion 22 from the main body portion 21A, and its width widens in the tangential direction of the stator 10 relative to the main body portion 21A of the teeth portion 20.

[0019] The main body portion 21A of the teeth portion 20 has a pair of side surfaces 20A facing both sides in the tangential direction of the stator 10. The tip portion 21B of the teeth portion 20 has a pair of outward-facing surfaces 20B facing radially outward of the stator 10. The outward-facing surfaces 20B are inclined with respect to the tangential direction of the stator 10. The core back portion 22 has a pair of inward-facing surfaces 22A facing radially inward of the stator 10 and a pair of side surfaces 22B facing both sides in the circumferential direction of the stator 10.

[0020] As shown in Figure 3, the rotating electric machine M includes an inverter circuit 15 that controls the stator 10. The inverter circuit 15 includes a plurality of switching elements (not shown) that switch the current flowing through a plurality of winding sections 18 (see Figure 1). For example, IGBTs (Insulated Gate Bipolar Transistors) are used as switching elements.

[0021] By the way, in the rotating electric machine M with the above configuration, if the space factor of the winding section 18 is low, the output will be low. On the other hand, if the space factor of the winding section 18 is high, the output will be high, but the cross-sectional area of ​​the inter-winding flow path formed between adjacent winding sections 18 will be small, and the flow rate of the refrigerant flowing through the inter-winding flow path will decrease. As a result, the winding section 18 will not be cooled easily, and the temperature of the winding section 18 will rise, increasing the resistance of the winding section 18, which in turn increases copper loss and reduces motor efficiency. Therefore, the challenge is to achieve both the space factor of the winding section 18 and motor efficiency. To achieve this, the rotating electric machine M employs the following configuration.

[0022] First, in order to specify the configuration, the definitions of terms will be explained. As shown in Figure 4, the regions adjacent to both sides of the teeth portion 20 are defined as "slots 80". A slot 80 is the combined region of region 80A adjacent to one side of the teeth portion 20 and region 80B adjacent to the other side. The number of slots 80 is the same as the number of teeth portions 20. Regions 80A and 80B of the slot 80 are in contact with the inward-facing surface 22A of the core back portion 22, the side surface 20A of the teeth portion 20, and the outward-facing surface 20B of the teeth portion 20, respectively. More specifically, they are defined by the regions enclosed by the inward-facing surface 22A, the side surface 20A, the outward-facing surface 20B, the radial surface 22C which extends the side surface 22B of the core back portion 22 radially inward from the stator 10, and the circumferential surface 20C which extends along the circumferential direction of the stator 10 from the end of the outward-facing surface 20B opposite to the side surface 20A. Furthermore, the area of ​​the slot 80 when the stator 10 is cut by a plane that passes through the axial center of the stator 10 and is perpendicular to the axial direction of the stator 10 is defined as the "cross-sectional area of ​​the slot 80".

[0023] Furthermore, as shown in Figure 5, the regions adjacent to both sides of the winding section 18 are defined as the "winding flow path 82". The winding flow path 82 is the combined region of region 82A adjacent to one side of the winding section 18 and region 82B adjacent to the other side. The cross-sectional area of ​​the winding flow path 82 is obtained by subtracting the combined cross-sectional area of ​​the pair of insulating sheets 40 on both sides, the cross-sectional area of ​​the insulator 16, and the cross-sectional area of ​​the winding section 18 within the cross-sectional area of ​​the slot 80 (see Figure 4), when the stator 10 is cut by a plane passing through the axial center of the stator 10 and perpendicular to the axial direction of the stator 10, from the cross-sectional area of ​​the slot 80. The cross-sectional area of ​​the winding section 18 includes the cross-sectional area of ​​the winding insulation material and the cross-sectional area of ​​the wire used in the winding section 18. Furthermore, the ratio of the cross-sectional area of ​​the winding flow path 82 to the cross-sectional area of ​​the slot 80 is defined as the "flow path cross-sectional area ratio".

[0024] Furthermore, the temperature obtained by subtracting the temperature of the refrigerant flowing through the winding channel 82 from the heat generated at the winding section 18 when a predetermined current is passed through it is defined as the "winding rise temperature". The heat generated is the temperature of the outer surface of the winding section 18. The winding rise temperature is proportional to the amount of heat dissipated by the winding section 18. The flow rate and temperature of the refrigerant flowing into the winding channel 82 are predetermined. For example, the flow rate of the refrigerant flowing into the winding channel 82 is 510 kg / h, and the temperature of the refrigerant flowing into the winding channel 82 is, for example, 25°C. The amount of heat dissipated by the winding section 18 is determined by the following formula (1). The heat transfer coefficient refers to the heat transfer efficiency based on the temperature difference between the surface of the winding section and the refrigerant flowing through the winding channel 82. However, Q represents the amount of heat dissipated by the winding section 18, k represents the heat transfer coefficient, t1 represents the heat generation temperature of the winding section 18, t2 represents the temperature of the refrigerant flowing through the winding channel 82, and S represents the surface area of ​​the winding section 18. Q = k × (t1 - t2) × S ... (1)

[0025] Furthermore, the cross-sectional area obtained by dividing the cross-sectional area of ​​the annular air gap between the stator 10 and the rotor 11 (hereinafter referred to as the "annular air gap") by the number of teeth 20, that is, the cross-sectional area of ​​the arc-shaped air gap corresponding to each teeth 20 (hereinafter referred to as the "arc-shaped air gap 84"), is defined as the "cross-sectional area of ​​the arc-shaped air gap 84," and the cross-sectional area obtained by adding the cross-sectional area of ​​the arc-shaped air gap 84 to the cross-sectional area of ​​the winding flow path 82 is defined as the "total flow path cross-sectional area." In addition, since the ratio of the cross-sectional area of ​​the winding flow path 82 to the total flow path cross-sectional area is proportional to the ratio of the flow rate of refrigerant flowing into the winding flow path 82 to the flow rate of refrigerant flowing into the arc-shaped air gap 84, the ratio of the cross-sectional area of ​​the winding flow path 82 to the total flow path cross-sectional area is defined as the "winding flow rate ratio," and the ratio of the cross-sectional area of ​​the arc-shaped air gap 84 to the total flow path cross-sectional area is defined as the "air gap flow rate ratio."

[0026] Figure 6 shows an example of the relationship between the flow path cross-sectional area ratio, the winding flow rate ratio, and the air gap flow rate ratio. In range A, the winding flow rate ratio increases as the flow path cross-sectional area ratio increases, and in range B, the winding flow rate ratio asymptotically approaches 100%, and only the cross-sectional area of ​​the winding flow path 82 increases. Therefore, the boundary value between range A and range B can be said to be the optimal flow path cross-sectional area ratio. In range A, conversely to the winding flow rate ratio, the air gap flow rate ratio decreases as the flow path cross-sectional area ratio increases, and in range B, the air gap flow rate ratio asymptotically approaches its minimum value.

[0027] Figure 7 shows an example of the relationship between the flow path cross-sectional area ratio, the heat transfer coefficient, and the flow velocity of the refrigerant flowing through the winding flow path 82. The heat transfer coefficient is a parameter that changes with the cross-sectional area of ​​the winding flow path 82. The heat transfer coefficient is proportional to the flow velocity of the refrigerant flowing through the winding flow path 82. In range A, the heat transfer coefficient increases as the flow path cross-sectional area ratio increases, and in range B, the heat transfer coefficient decreases as the flow path cross-sectional area ratio increases. That is, in range A, the heat dissipation performance improves, and in range B, the heat dissipation performance decreases or plateaus. At the optimal flow path cross-sectional area ratio, the heat transfer coefficient and the flow velocity of the refrigerant are approximately at their maximum values.

[0028] Figure 8 shows an example of the relationship between the flow path cross-sectional area ratio and the temperature of the refrigerant flowing through the winding flow path 82. The temperature of the refrigerant flowing through the winding flow path 82 is a parameter that changes with the cross-sectional area of ​​the winding flow path 82. In range A, the temperature of the refrigerant decreases as the flow path cross-sectional area ratio increases, and in range B, the temperature of the refrigerant asymptotically approaches the lower limit, and only the cross-sectional area of ​​the winding flow path 82 increases. At the optimal flow path cross-sectional area ratio, the temperature of the refrigerant becomes an asymptotic value of the lower limit.

[0029] Figure 9 shows an example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio when the number of magnetic poles arranged circumferentially on the rotor 11 is 8 and the number of slots 80 is 12 (i.e., 8 poles, 12 slots). In range A, the winding temperature rise decreases as the flow path cross-sectional area ratio increases, and in range B, the winding temperature rise increases as the flow path cross-sectional area ratio increases. At the optimal flow path cross-sectional area ratio, the winding temperature rise is approximately at its minimum value. As described above, the winding temperature rise is proportional to the amount of heat dissipated by the winding winding section 18, and the amount of heat dissipated by the winding winding section 18 is determined using the heat transfer coefficient and the temperature of the refrigerant flowing through the winding flow path 82. Therefore, the graph of the winding temperature rise reflects the graphs in Figure 7 and Figure 8. As explained in Figure 6, in range A, the winding flow rate ratio increases as the flow path cross-sectional area ratio increases, and in range B, the winding flow rate ratio asymptotically approaches 100%, and only the cross-sectional area of ​​the winding flow path 82 increases.

[0030] Furthermore, the ratio of the flow path cross-sectional area must be greater than the ratio at which the cross-sectional area of ​​the winding flow path 82 equals the cross-sectional area of ​​the arc-shaped air gap 84. This is because if the ratio of the flow path cross-sectional area is smaller than the ratio at which the cross-sectional area of ​​the winding flow path 82 equals the cross-sectional area of ​​the arc-shaped air gap 84, the flow rate of refrigerant flowing into the arc-shaped air gap 84 will increase more than that flowing into the winding flow path 82, and the cooling performance of the winding section 18 will decrease.

[0031] From the above results, if the flow path cross-sectional area ratio is set to be greater than the ratio in which the cross-sectional area of ​​the winding flow path 82 is equal to the cross-sectional area of ​​the arc-shaped air gap 84, and less than or equal to the ratio in which the winding temperature rise reaches the lower limit and the winding flow rate ratio reaches the upper limit (i.e., an asymptotic value of the upper limit), then it is possible to suppress the temperature rise of the winding winding section 18 while ensuring the space utilization ratio of the winding winding section 18, thereby achieving both the space utilization ratio of the winding winding section 18 and motor efficiency.

[0032] In the rotating electric machine M according to the first embodiment, based on the results in Figure 9, the flow path cross-sectional area ratio is set to be greater than the ratio in which the cross-sectional area of ​​the winding flow path 82 is equal to the cross-sectional area of ​​the arc-shaped air gap 84, and less than or equal to the ratio in which the winding temperature rise reaches the lower limit and the winding flow rate ratio reaches the upper limit (i.e., the range shown by hatching in Figure 9). The graph shown in Figure 9 is for the case where the number of multiple magnetic poles arranged in the circumferential direction of the rotor 11 is 8 and the number of multiple slots 80 is 12. Specifically, by setting the flow path cross-sectional area ratio to be greater than 12% and 41% or less, it is possible to achieve both the space utilization ratio of the winding winding section 18 and motor efficiency.

[0033] As described in detail above, the rotating electric machine M according to the first embodiment has a configuration in which the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 8 and the number of slots 80 is 12, and the ratio of the flow path cross-sectional area is set to be greater than the ratio in which the cross-sectional area of ​​the winding flow path 82 is equal to the cross-sectional area of ​​the arc-shaped air gap 84, and less than or equal to the ratio in which the winding temperature rise reaches the lower limit and the winding flow rate ratio reaches the upper limit. Therefore, it is possible to achieve both the space utilization ratio of the winding winding section 18 and motor efficiency.

[0034] In the above embodiment, the case where the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 8 and the number of slots 80 is 12 (i.e., the case of 8 poles and 12 slots) was described. However, the following will describe cases where the number of magnetic poles and the number of slots 80 are other than those described above.

[0035] Figure 10 shows an example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio when the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 4 and the number of slots 80 is 6 (i.e., the case of 4 poles and 6 slots). From the graph shown in Figure 10, it can be seen that if the flow path cross-sectional area ratio is set to be greater than 4% and 10% or less, it is possible to achieve both the space utilization ratio of the winding section 18 and motor efficiency.

[0036] Figure 11 shows an example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio when the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 6 and the number of slots 80 is 9 (i.e., 6 poles and 9 slots). From the graph shown in Figure 11, it can be seen that by setting the flow path cross-sectional area ratio to be greater than 8% and 23% or less, it is possible to achieve both the space utilization ratio of the winding section 18 and motor efficiency.

[0037] Figure 12 shows an example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio when the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 10 and the number of slots 80 is 15 (i.e., 10 poles and 15 slots). From the graph shown in Figure 12, it can be seen that if the flow path cross-sectional area ratio is set to be greater than 16% and 46% or less, it is possible to achieve both the space utilization ratio of the winding section 18 and motor efficiency.

[0038] The examples shown in Figures 9 to 12 above are examples in which IGBTs are used for multiple switching elements (not shown) provided in the inverter circuit 15. Below, we will show an example in which SiC devices are used for multiple switching elements provided in the inverter circuit 15. SiC refers to silicon carbide. When the rotating electric machine M is used as a fan motor, by using SiC devices for multiple switching elements, the driving frequency can be increased and the rotational speed of the fan can be increased, which in turn can increase the flow rate of the refrigerant and improve the cooling efficiency of the winding section 18.

[0039] Figure 13 shows an example of the relationship between the flow path cross-sectional area ratio, winding temperature rise, and winding flow rate ratio when the number of magnetic poles arranged in the circumferential direction of the rotor 11 is 8 and the number of slots 80 is 12 (i.e., the case of 8 poles and 12 slots). From the graph shown in Figure 13, it can be seen that if the flow path cross-sectional area ratio is set to be greater than 12% and 61% or less, it is possible to achieve both the space factor of the winding section 18 and motor efficiency.

[0040] Fig. 14 shows an example of the relationship between the flow path cross-sectional area ratio, the winding temperature rise, and the winding flow rate ratio when the number of a plurality of magnetic poles arranged in the circumferential direction of the rotor 11 is 4 and the number of a plurality of slots 80 is 6. From the graph shown in Fig. 14, if the flow path cross-sectional area ratio is set to be greater than 4% and 21% or less, the occupation ratio of the winding winding portion 18 and the motor efficiency can be made compatible.

[0041] Fig. 15 shows an example of the relationship between the flow path cross-sectional area ratio, the winding temperature rise, and the winding flow rate ratio when the number of a plurality of magnetic poles arranged in the circumferential direction of the rotor 11 is 6 and the number of a plurality of slots 80 is 9 (that is, in the case of 6 poles and 9 slots). From the graph shown in Fig. 15, if the flow path cross-sectional area ratio is set to be greater than 8% and 46% or less, the occupation ratio of the winding winding portion 18 and the motor efficiency can be made compatible.

[0042] Fig. 16 shows an example of the relationship between the flow path cross-sectional area ratio, the winding temperature rise, and the winding flow rate ratio when the number of a plurality of magnetic poles arranged in the circumferential direction of the rotor 11 is 10 and the number of a plurality of slots 80 is 15 (that is, in the case of 10 poles and 15 slots). From the graph shown in Fig. 16, if the flow path cross-sectional area ratio is set to be greater than 16% and 69% or less, the occupation ratio of the winding winding portion 18 and the motor efficiency can be made compatible.

[0043] Fig. 17 shows an example of the relationship between the flow path cross-sectional area ratio, the winding temperature rise, and the winding flow rate ratio when the number of a plurality of magnetic poles arranged in the circumferential direction of the rotor 11 is 12 and the number of a plurality of slots 80 is 18 (that is, in the case of 12 poles and 18 slots). From the graph shown in Fig. 17, if the flow path cross-sectional area ratio is set to be greater than 20% and 75% or less, the occupation ratio of the winding winding portion 18 and the motor efficiency can be made compatible.

[0044] Fig. 18 shows an example of the relationship between the flow path cross-sectional area ratio, the winding temperature rise, and the winding flow rate ratio when the number of a plurality of magnetic poles arranged in the circumferential direction of the rotor 11 is 14 and the number of a plurality of slots 80 is 21 (that is, in the case of 14 poles and 21 slots). From the graph shown in Fig. 18, if the flow path cross-sectional area ratio is set to be greater than 24% and 81% or less, the occupation ratio of the winding winding portion 18 and the motor efficiency can be made compatible.

[0045] In the first embodiment, the stator core 24 is divided into a plurality of core members 14. The plurality of core members 14 are independently configured, but the plurality of core members 14 may be rotatably connected by a rotary connecting portion having the axial direction of the stator core 24 as the rotation axis. Instead of the plurality of core members 14 being rotatably connected by a connecting portion, a plurality of insulators 16 respectively attached to the plurality of core members 14 may be rotatably connected by a rotary connecting portion. Further, the plurality of core members 14 may be integrally formed, and the plurality of insulators 16 may also be integrally formed.

[0046] [Second Embodiment] Next, a second embodiment of the technology of the present disclosure will be described.

[0047] In the second embodiment of the technology of the present disclosure, the configuration of each stator component 12 is changed as follows with respect to the above-described first embodiment.

[0048] As shown in FIGS. 19 and 20, each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The Z1 side indicates one side in the axial direction of the stator 10, and the Z2 side indicates the other side in the axial direction of the stator 10. The insulator 16 has a pair of insulating members 30 and a pair of insulating sheets 40. The insulating member 30 is a three-dimensional resin component formed by resin molding. The insulating sheet 40 is a sheet-like resin sheet material. The insulating sheet 40 is in a three-dimensionally bent manner.

[0049] One of the pair of insulating members 30 is attached to the core member 14 from the Z1 side, and the other insulating member 30 is attached to the core member 14 from the Z2 side. The pair of insulating members 30 are formed symmetrically in the Z direction. Each insulating member 30 is also formed symmetrically in the X direction. The pair of insulating sheets 40 are formed symmetrically in the X direction. Each insulating sheet 40 is also formed symmetrically in the Z direction. The following will mainly describe the configuration of one side in the X direction of the insulating member 30 located on the Z1 side of the pair of insulating members 30. Similarly, the configuration of the Z1 side of the insulating sheet 40 located on one side in the X direction of the pair of insulating sheets 40 will mainly be described.

[0050] The insulating member 30 has a main body insulating portion 31A that insulates the main body portion 21A of the teeth portion 20, a tip insulating portion 31B that insulates the tip portion 21B of the teeth portion 20, and a core back portion insulating portion 32 that insulates the core back portion 22.

[0051] The main body insulating portion 31A has a side insulating portion 30A that insulates the tooth portion 20 by covering the side surface 20A of the tooth portion 20 from the X direction. The tip insulating portion 31B has an outward-facing surface insulating portion 30B that extends in the X direction in correspondence with the spread of the tip portion 21B of the tooth portion 20 in the X direction and insulates by covering the outward-facing surface 20B. The outward-facing surface insulating portion 30B includes not only the portion that covers the outward-facing surface 20B, but also the portion that extends in the X direction from the portion that covers the outward-facing surface 20B. The outward-facing surface insulating portion 30B has a retaining groove 38 that holds the winding terminal portion 19 connected to the winding winding portion 18. The outward-facing surface insulating portion 30B also has a groove 36. The core back insulating portion 32 has an inward-facing surface insulating portion 32A that insulates the core back portion 22 by covering the inward-facing surface 22A of the core back portion 22.

[0052] The insulating sheet 40 has a main body insulating portion 41A that insulates the main body portion 21A of the teeth portion 20, a tip insulating portion 41B that insulates the tip portion 21B of the teeth portion 20, a core back portion insulating portion 42 that insulates the core back portion 22, and a winding portion insulating portion 50 that insulates adjacent winding portions 18.

[0053] The main body insulating portion 41A has a side insulating portion 40A that insulates the tooth portion 20 by covering the side surface 20A of the tooth portion 20 from the X direction. The tip insulating portion 41B has an outward-facing surface insulating portion 40B that extends in the X direction in accordance with the spread of the tip portion 21B of the tooth portion 20 in the X direction and insulates by covering the outward-facing surface 20B. The core back insulating portion 42 has an inward-facing surface insulating portion 42A that insulates the core back portion 22 by covering the inward-facing surface 22A of the core back portion 22.

[0054] The side insulating portion 40A of the insulating sheet 40 is positioned between the side insulating portion 30A of the insulating member 30 and the side surface 20A of the tooth portion 20, and the side insulating portion 30A of the insulating member 30 insulates the side surface 20A of the tooth portion 20 via the side insulating portion 40A of the insulating sheet 40. The outward-facing insulating portion 40B of the insulating sheet 40 is positioned between the outward-facing insulating portion 30B of the insulating member 30 and the outward-facing surface 20B of the tooth portion 20, and the outward-facing insulating portion 30B of the insulating member 30 insulates the outward-facing surface 20B of the tooth portion 20 via the outward-facing insulating portion 40B of the insulating sheet 40.

[0055] The inward-facing insulating portion 42A of the insulating sheet 40 is positioned between the inward-facing insulating portion 32A of the insulating member 30 and the inward-facing surface 22A of the core back portion 22, and the inward-facing insulating portion 32A of the insulating member 30 insulates the inward-facing surface 22A of the core back portion 22 via the inward-facing insulating portion 42A of the insulating sheet 40. The winding portion insulating portion 50 is connected to the outward-facing insulating portion 40B and is bent toward the core back portion 22 with the tip portion 21B side of the teeth portion 20 as the base end.

[0056] As shown in Figure 21, the winding insulation portion 50 has a protruding portion 52 that protrudes in the Z direction. The protruding portion 52 has a length corresponding to the Z-direction lengths of the side insulation portion 30A, the outward-facing insulation portion 30B, and the inward-facing insulation portion 32A formed on the insulating member 30. The protruding portion 52 has an inner bent portion 54 and an outer bent portion 56. The inner bent portion 54 is bent from the inner end of the protruding portion 52 in the Y direction toward the teeth portion 20. The outer bent portion 56 is bent from the outer end of the protruding portion 52 in the Y direction toward the teeth portion 20. The inner bent portion 54 is formed integrally with the outward-facing insulation portion 40B, and the outer bent portion 56 is formed integrally with the inward-facing insulation portion 42A.

[0057] As shown in Figure 22, in a state where multiple stator components 12 are assembled in a ring shape (see also Figure 1), the multiple insulating sheets 40 attached to each of the multiple core members 14 are arranged in a line in the circumferential direction of the stator 10. Similarly, the multiple winding portions 18 wound around each of the multiple core members 14 are arranged in a line in the circumferential direction of the stator 10.

[0058] The winding portion insulating portion 50 of each insulating sheet 40 is positioned between adjacent winding portions 18 of the multiple winding portions 18. The winding portion insulating portions 50 of adjacent insulating sheets 40 are overlapped in the circumferential direction of the stator 10.

[0059] Hereinafter, one of two adjacent tooth portions 20 will be referred to as the "first tooth portion 20L," and the other of two adjacent tooth portions 20 will be referred to as the "second tooth portion 20R." Furthermore, the insulating sheet 40 attached to the first tooth portion 20L among the multiple insulating sheets 40 will be referred to as the "first insulating sheet 40L," and the insulating sheet 40 attached to the second tooth portion 20R among the multiple insulating sheets 40 will be referred to as the "second insulating sheet 40R."

[0060] Furthermore, the winding insulation portion 50 of the first insulating sheet 40L is referred to as the "first winding insulation portion 50L," the inner folded portion 54 of the first insulating sheet 40L is referred to as the "first inner folded portion 54L," and the outer folded portion 56 of the first insulating sheet 40L is referred to as the "first outer folded portion 56L." Furthermore, the winding insulation portion 50 of the second insulating sheet 40R is referred to as the "second winding insulation portion 50R," the inner folded portion 54 of the second insulating sheet 40R is referred to as the "second inner folded portion 54R," and the outer folded portion 56 of the second insulating sheet 40R is referred to as the "second outer folded portion 56R." The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0061] Furthermore, one of the adjacent insulating members 30 is referred to as the "first insulating member 30L," and the other of the adjacent insulating members 30 is referred to as the "second insulating member 30R." The first insulating member 30L and the second insulating member 30R have an inner clamping portion 64. The inner clamping portion 64 is an example of a "clamping portion" according to the technology of this disclosure. The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the ends on each side of the outward-facing insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. Furthermore, the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are held together by the inner clamping portion 64.

[0062] The first inner bent portion 54L is inserted into a groove 36 formed in the outward-facing insulating portion 30B of the first insulating member 30L, and the second inner bent portion 54R is inserted into a groove 36 formed in the outward-facing insulating portion 30B of the second insulating member 30R. Furthermore, the first inner bent portion 54L overlaps with the outward-facing insulating portion 30B of the first insulating member 30L in the tangential direction of the stator 10, and the second inner bent portion 54R overlaps with the outward-facing insulating portion 30B of the second insulating member 30R in the tangential direction of the stator 10. In addition, the first outer bent portion 56L overlaps with the inward-facing insulating portion 32A of the first insulating member 30L in the tangential direction of the stator 10, and the second outer bent portion 56R overlaps with the inward-facing insulating portion 32A of the second insulating member 30R in the tangential direction of the stator 10.

[0063] Next, the effects of the stator 10 according to the second embodiment will be described.

[0064] First, in order to clarify the effects of the stator 10 according to the second embodiment, the first comparative example shown in Figure 26 will be described. The stator 110 according to the first comparative example has a configuration in which the inner clamping portion 64 is omitted compared to the stator 10 according to the second embodiment described above. That is, the stator 110 according to the first comparative example has a configuration in which the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are not clamped.

[0065] As described above, if the inner clamping portion 64 is omitted, the radius of curvature may differ between the corner 58L between the first winding section insulation portion 50L and the first inner bent portion 54L, and between the corner 58R between the second winding section insulation portion 50R and the second inner bent portion 54R. Here, the springback force acting on the first winding section insulation portion 50L depends on the radius of curvature of the corner 58L, and the springback force acting on the second winding section insulation portion 50R depends on the radius of curvature of the corner 58R. Therefore, if the radii of curvature differ between the corner 58L and the corner 58R, an imbalance occurs between the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R, and the first winding section insulation portion 50L and the second winding section insulation portion 50R may deform to one side. In this case, the insulating portion 50L of the first winding section and the insulating portion 50R of the second winding section come into contact with one of the adjacent winding sections 18, reducing the heat dissipation performance of the adjacent winding sections 18.

[0066] In contrast, in the stator 10 according to the second embodiment (see Figure 5), the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are clamped by the inner clamping portion 64. Therefore, the radius of curvature can be made the same at the corner portion 58L and the corner portion 58R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. As a result, deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R that is biased to one side is suppressed, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0067] Furthermore, the first inner bent portion 54L overlaps with the outward-facing insulating portion 30B of the first insulating member 30L in the tangential direction of the stator 10, and the second inner bent portion 54R overlaps with the outward-facing insulating portion 30B of the second insulating member 30R in the tangential direction of the stator 10. As a result, an insulating distance (i.e., the phase-to-phase insulating distance D1 in Figure 5) can be secured between adjacent winding end portions 19 along the adjacent outward-facing insulating portions 30B and the first inner bent portion 54L and the second inner bent portion 54R, thereby improving the insulation between adjacent winding end portions 19.

[0068] Furthermore, the first outer bent portion 56L overlaps with the inward-facing insulating portion 32A of the first insulating member 30L in the tangential direction of the stator 10, and the second outer bent portion 56R overlaps with the inward-facing insulating portion 32A of the second insulating member 30R in the tangential direction of the stator 10. As a result, an insulating distance (i.e., the phase-to-phase insulating distance D2 in Figure 5) can be secured between adjacent winding portions 18 along the adjacent inward-facing insulating portions 32A, the first outer bent portion 56L, and the second outer bent portion 56R, thereby improving the insulation between adjacent winding portions 18.

[0069] [Third Embodiment] Next, a third embodiment of the technology of the present disclosure will be described.

[0070] As shown in Figure 23, in the third embodiment, the configuration of the first insulating member 30L, the second insulating member 30R, the first insulating sheet 40L, and the second insulating sheet 40R is modified from that of the second embodiment as follows. That is, the first insulating member 30L and the second insulating member 30R have an inner clamping portion 64 and an outer clamping portion 66. The outer clamping portion 66 is an example of the "clamping portion" and "first clamping portion" according to the technology of this disclosure, and the inner clamping portion 64 is an example of the "second clamping portion" according to the technology of this disclosure.

[0071] The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the mutual ends of the outward-facing insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. The outer clamping portion 66 is formed at the outer ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the outer clamping portion 66 is formed at the mutual ends of the inward-facing insulating portion 32A formed on the first insulating member 30L and the second insulating member 30R.

[0072] The first insulating sheet 40L has a first outer bent portion 56L that is bent from the outer end of the first winding section insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second outer bent portion 56R that is bent from the outer end of the second winding section insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first outer bent portion 56L is an example of the "first bent portion" according to the technology of this disclosure, and the second outer bent portion 56R is an example of the "second bent portion" according to the technology of this disclosure.

[0073] The first outer bent portion 56L may be formed as an inward-facing insulating portion 42A formed on the first insulating sheet 40L. Similarly, the second outer bent portion 56R may be formed as an inward-facing insulating portion 42A formed on the second insulating sheet 40R. In the third embodiment, the first inner bent portion 54L and the second inner bent portion 54R (see Figure 5) in the second embodiment described above are omitted.

[0074] Furthermore, the portion of the first winding section insulation portion 50L on the side of the first outer bend portion 56L and the portion of the second winding section insulation portion 50R on the side of the second outer bend portion 56R are held together by the outer clamping portion 66. In addition, the portion of the first winding section insulation portion 50L opposite to the first outer bend portion 56L and the portion of the second winding section insulation portion 50R opposite to the first outer bend portion 56L are held together by the inner clamping portion 64.

[0075] Next, the effects of the stator 10 according to the third embodiment will be described.

[0076] First, in order to clarify the effects of the stator 10 according to the third embodiment, a second comparative example shown in Figure 27 will be described. The stator 210 according to the second comparative example has a configuration in which the outer clamping portion 66 is omitted compared to the stator 10 according to the second embodiment described above. That is, the stator 210 according to the second comparative example has a configuration in which the portion of the first winding section insulation portion 50L on the side of the first outer bent portion 56L and the portion of the second winding section insulation portion 50R on the side of the second outer bent portion 56R are not clamped.

[0077] As described above, if the outer clamping portion 66 is omitted, the radius of curvature may differ between the corner 60L between the first winding section insulation portion 50L and the first outer bent portion 56L, and between the corner 60R between the second winding section insulation portion 50R and the second outer bent portion 56R. Here, the springback force acting on the first winding section insulation portion 50L depends on the radius of curvature of the corner 60L, and the springback force acting on the second winding section insulation portion 50R depends on the radius of curvature of the corner 60R. Therefore, if the radii of curvature differ between the corner 60L and the corner 60R, an imbalance occurs between the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R, and the first winding section insulation portion 50L and the second winding section insulation portion 50R may deform to one side. In this case, the insulating portion 50L of the first winding section and the insulating portion 50R of the second winding section come into contact with one of the adjacent winding sections 18, reducing the heat dissipation performance of the winding section 18.

[0078] Furthermore, if the outer clamping portion 66 is omitted, the radius of curvature of the corners 60L and 60R increases. In this case, when a coolant is flowed between adjacent winding portions 18 to cool them, the cross-sectional area of ​​the space 70 that does not contribute to heat dissipation from the adjacent winding portions 18 (i.e., the space on the opposite side of the adjacent winding portions 18 from the first insulating sheet 40L and the second insulating sheet 40R) increases, further reducing the heat dissipation performance of the adjacent winding portions 18.

[0079] In contrast, in the stator 10 according to the third embodiment (see Figure 23), the portion of the first winding section insulation portion 50L on the side of the first outer bent portion 56L and the portion of the second winding section insulation portion 50R on the side of the second outer bent portion 56R are clamped by the outer clamping portion 66. Therefore, the radius of curvature can be made the same at the corner portion 60L and the corner portion 60R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. As a result, deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R that is biased to one side is suppressed, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0080] Furthermore, by having the outer clamping portion 66, it is possible to suppress the increase in the radius of curvature of the corners 60L and 60R. As a result, when a coolant is flowed between adjacent winding portions 18 to cool the adjacent winding portions 18, the cross-sectional area of ​​the space 70 that does not contribute to heat dissipation from the adjacent winding portions 18 (i.e., the space on the opposite side of the adjacent winding portions 18 from the first insulating sheet 40L and the second insulating sheet 40R) can be reduced, thereby improving the heat dissipation of the adjacent winding portions 18.

[0081] Furthermore, the portion of the first winding section insulation portion 50L opposite to the first outer bent portion 56L and the portion of the second winding section insulation portion 50R opposite to the second outer bent portion 56R are clamped by the inner clamping portion 64. This makes it possible to more effectively suppress deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side.

[0082] [Fourth Embodiment] Next, a fourth embodiment of the technology of the present disclosure will be described.

[0083] As shown in Figure 24, in the fourth embodiment, the configuration of the first insulating sheet 40L and the second insulating sheet 40R is modified from that of the third embodiment as follows. Specifically, the first insulating sheet 40L has a first inner bent portion 54L that is bent from the inner end of the first winding section insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second inner bent portion 54R that is bent from the inner end of the second winding section insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0084] The first inner folded portion 54L may be formed as an outward-facing insulating portion 40B formed on the first insulating sheet 40L. Similarly, the second outer folded portion 56R may be formed as an outward-facing insulating portion 40B formed on the second insulating sheet 40R.

[0085] The first winding section insulation portion 50L has a first extension portion 50A extending from the radially outer side to the inner side of the stator 10, and a second extension portion 50B extending from the radially inner side to the outer side of the stator 10. The first extension portion 50A and the second extension portion 50B have a first overlap portion 74 that overlaps radially with the stator 10. The second winding section insulation portion 50R has a third extension portion 50C extending from the radially outer side to the inner side of the stator 10, and a fourth extension portion 50D extending from the radially inner side to the outer side of the stator 10. The third extension portion 50C and the fourth extension portion 50D have a second overlap portion 76 that overlap radially with the stator 10.

[0086] Next, we will explain the differences between the effects of the stator 10 according to the fourth embodiment and those of the third embodiment.

[0087] In the stator 10 according to the fourth embodiment, the first extension portion 50A and the second extension portion 50B formed in the first winding section insulating portion 50L have a first overlap portion 74 that overlaps radially in the stator 10. As a result, in the stator component 12 having the first winding section insulating portion 50L, an insulating distance along the first extension portion 50A and the first overlap portion 74 (i.e., the ground insulating distance D3 in Figure 24) can be secured between the core member 14 and the winding section 18, thereby improving the insulation performance with respect to the core member 14. Furthermore, in the stator component 12 having the first winding section insulating portion 50L, an insulating distance along the second extension portion 50B, the outward-facing insulating portion 30B, and the outward-facing insulating portion 40B (i.e., the ground insulating distance D4 in Figure 24) can be secured between the core member 14 and the winding end portion 19, thereby improving the insulation performance with respect to the core member 14.

[0088] Similarly, the third extension portion 50C and the fourth extension portion 50D formed on the second winding section insulating portion 50R have a second overlap portion 76 that overlaps radially with the stator 10. As a result, in the stator component 12 having the second winding section insulating portion 50R, an insulating distance along the third extension portion 50C and the second overlap portion 76 (i.e., the ground insulating distance D5 in Figure 24) can be secured between the core member 14 and the winding section 18, thereby improving the insulation to the core member 14. Furthermore, in the stator component 12 having the second winding section insulating portion 50R, an insulating distance along the fourth extension portion 50D, the outward-facing insulating portion 30B, and the outward-facing insulating portion 40B (i.e., the ground insulating distance D6 in Figure 24) can be secured between the core member 14 and the winding end portion 19, thereby improving the insulation to the core member 14.

[0089] Furthermore, since an insulating distance (i.e., the phase-to-phase insulating distance D7 in Figure 24) can be secured between adjacent winding sections 18 along the first overlap section 74 and the second overlap section 76, the insulating performance between adjacent winding sections 18 can be improved.

[0090] [Fifth Embodiment] Next, a fifth embodiment of the technology of the present disclosure will be described.

[0091] As shown in Figure 25, in the fifth embodiment, the configuration of the first insulating member 30L, the second insulating member 30R, the first insulating sheet 40L, and the second insulating sheet 40R is modified from that of the second embodiment as follows. That is, the first insulating member 30L and the second insulating member 30R have an inner clamping portion 64 and an outer clamping portion 66. The inner clamping portion 64 is an example of the "clamping portion" and "first clamping portion" according to the technology of this disclosure, and the outer clamping portion 66 is an example of the "second clamping portion" according to the technology of this disclosure.

[0092] The inner clamping portion 64 is formed at the inner ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the inner clamping portion 64 is formed at the mutual ends of the outward-facing insulating portion 30B formed on the first insulating member 30L and the second insulating member 30R. The outer clamping portion 66 is formed at the outer ends of the first insulating member 30L and the second insulating member 30R in the radial direction of the stator 10. Specifically, the outer clamping portion 66 is formed at the mutual ends of the inward-facing insulating portion 32A formed on the first insulating member 30L and the second insulating member 30R.

[0093] The first insulating sheet 40L has a first inner bent portion 54L that is bent from the inner end of the first winding section insulating portion 50L in the radial direction of the stator 10 toward the first teeth portion 20L, and the second insulating sheet 40R has a second inner bent portion 54R that is bent from the inner end of the second winding section insulating portion 50R in the radial direction of the stator 10 toward the second teeth portion 20R. The first inner bent portion 54L is an example of the "first bent portion" according to the technology of this disclosure, and the second inner bent portion 54R is an example of the "second bent portion" according to the technology of this disclosure.

[0094] The first inner bent portion 54L may be formed as an outward-facing insulating portion 40B formed on the first insulating sheet 40L. Similarly, the second inner bent portion 54R may be formed as an outward-facing insulating portion 40B formed on the second insulating sheet 40R. In the fifth embodiment, the first outer bent portion 56L and the second outer bent portion 56R (see Figure 5) in the second embodiment described above are omitted.

[0095] Furthermore, the portion of the first winding section insulation portion 50L on the side of the first inner bend portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bend portion 54R are held together by the inner clamping portion 64. In addition, the portion of the first winding section insulation portion 50L opposite to the first inner bend portion 54L and the portion of the second winding section insulation portion 50R opposite to the first inner bend portion 54L are held together by the outer clamping portion 66.

[0096] Next, the effects of the stator 10 according to the fifth embodiment will be described.

[0097] In the stator 10 according to the fifth embodiment, the portion of the first winding section insulation portion 50L on the side of the first inner bent portion 54L and the portion of the second winding section insulation portion 50R on the side of the second inner bent portion 54R are clamped by the inner clamping portion 64. Therefore, the radius of curvature can be made the same at the corner portion 58L and the corner portion 58R, so that the springback force acting on the first winding section insulation portion 50L and the springback force acting on the second winding section insulation portion 50R can be made the same. This suppresses deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side, and the first winding section insulation portion 50L and the second winding section insulation portion 50R can be arranged between adjacent winding sections 18, thereby ensuring heat dissipation of adjacent winding sections 18.

[0098] Furthermore, the portion of the first winding section insulation portion 50L opposite to the first inner bent portion 54L and the portion of the second winding section insulation portion 50R opposite to the second inner bent portion 54R are clamped by the outer clamping portion 66. This makes it possible to more effectively suppress deformation of the first winding section insulation portion 50L and the second winding section insulation portion 50R so as to be biased to one side.

[0099] Furthermore, among the configurations described in each of the above embodiments, the combinable configurations may be combined as appropriate.

[0100] Although one embodiment of the technology of this disclosure has been described above, the present invention is not limited to the above, and it is of course possible to implement it in various modified forms without departing from the spirit of the invention.

[0101] The following are additional notes regarding the technology of this disclosure. (Addendum 1) The stator comprises a stator (10) and a rotor (11) rotatably mounted inside the stator, wherein the stator comprises a stator core (24) having a plurality of radially extending teeth (20), an insulator (16) mounted on the stator core, and a plurality of winding sections (18) wound around the plurality of teeth via the insulator, the ratio of the cross-sectional area of ​​the winding flow path (82) adjacent to both sides of the winding section to the cross-sectional area of ​​the slots (80) adjacent to both sides of the teeth is defined as the flow path cross-sectional area ratio, and the temperature obtained by subtracting the temperature of the refrigerant flowing through the winding flow path from the heat generated by the winding section when a current of a predetermined value is passed through the winding section is defined as the winding rise temperature, A rotating electric machine (M), wherein the cross-sectional area obtained by adding the cross-sectional area of ​​the arc-shaped air gap (84), which is obtained by dividing the cross-sectional area of ​​the annular air gap between the stator and the rotor by the number of teeth portions, to the cross-sectional area of ​​the winding flow path is defined as the total flow path cross-sectional area, and the ratio of the cross-sectional area of ​​the winding flow path to the total flow path cross-sectional area is defined as the winding flow rate ratio, wherein the flow path cross-sectional area ratio is set to be greater than the ratio at which the cross-sectional area of ​​the winding flow path is equal to the cross-sectional area of ​​the arc-shaped air gap, and less than or equal to the ratio at which the winding temperature rise reaches a lower limit and the winding flow rate ratio reaches an upper limit. (Note 2) The rotating electric machine according to Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 4, and the number of multiple slots is 6, and the flow path cross-sectional area ratio is set to 10% or less. (Note 3) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 6, and the number of multiple slots is 9, and the flow path cross-sectional area ratio is set to 23% or less. (Note 4) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 8, and the number of multiple slots is 12, and the flow path cross-sectional area ratio is set to 41% or less.(Note 5) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 10, and the number of multiple slots is 15, and the flow path cross-sectional area ratio is set to 46% or less. (Note 6) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 4, and the number of multiple slots is 6, and SiC devices are used as switching elements in the inverter circuit (15) that controls the stator, and the flow path cross-sectional area ratio is set to 21% or less. (Note 7) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 6, and the number of multiple slots is 9, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 46% or less. (Note 8) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 8, the number of multiple slots is 12, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 61% or less. (Note 9) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 10, the number of multiple slots is 15, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 69% or less. (Note 10) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 12, the number of multiple slots is 18, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 75% or less. (Note 11) The rotating electric machine described in Note 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 14, the number of multiple slots is 12, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 81% or less.(Note 12) The insulator comprises a plurality of insulating members (30) attached to a plurality of teeth portions, and a plurality of insulating sheets (40) attached to a plurality of teeth portions, wherein the plurality of insulating sheets include a first insulating sheet (40L) attached to a first tooth portion (20L) of adjacent teeth portions, and a second insulating sheet (40R) attached to a second tooth portion (20R) of adjacent teeth portions, wherein the first insulating sheet includes a first winding portion insulating portion (50L) that insulates adjacent winding portions, and a first bent portion (54L, 56L) that is bent from the end of the first winding portion insulating portion in the radial direction of the stator core toward the first tooth portion, and the second insulating sheet includes a second winding portion insulating portion (50R) that insulates adjacent winding portions, A rotating electric machine as described in any one of Appendix 1 to Appendix 11, having a second bent portion (54R, 56R) that is bent from the end of the second winding section insulating portion in the radial direction of the stator core toward the second teeth portion, wherein adjacent insulating members have clamping portions (64, 66) that clamp the portion of the first winding section insulating portion toward the first bent portion and the portion of the second winding section insulating portion toward the second bent portion.

Claims

1. The apparatus comprises a stator (10) and a rotor (11) rotatably mounted inside the stator, wherein the stator comprises a stator core (24) having a plurality of radially extending teeth (20), an insulator (16) mounted on the stator core, and a plurality of winding sections (18) wound around the plurality of teeth via the insulator, wherein the ratio of the cross-sectional area of ​​the winding flow path (82) adjacent to both sides of the winding section to the cross-sectional area of ​​the slots (80) adjacent to both sides of the teeth is defined as the flow path cross-sectional area ratio, and the temperature obtained by subtracting the temperature of the refrigerant flowing through the winding flow path from the heat generated by the winding section when a current of a predetermined value is passed through the winding section is defined as the winding rise temperature, A rotating electric machine (M) is defined as having a total flow path cross-sectional area obtained by adding the cross-sectional area of ​​an arc-shaped air gap (84) obtained by dividing the cross-sectional area of ​​the annular air gap between the stator and the rotor by the number of teeth portions to the cross-sectional area of ​​the winding flow path, and defining the ratio of the cross-sectional area of ​​the winding flow path to the total flow path cross-sectional area as the winding flow rate ratio, wherein the flow path cross-sectional area ratio is set to be greater than the ratio at which the cross-sectional area of ​​the winding flow path becomes equal to the cross-sectional area of ​​the arc-shaped air gap, and less than or equal to the ratio at which the winding temperature rise reaches a lower limit and the winding flow rate ratio reaches an upper limit.

2. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 4, and the number of multiple slots is 6, and the flow path cross-sectional area ratio is set to 10% or less.

3. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 6, and the number of multiple slots is 9, and the flow path cross-sectional area ratio is set to 23% or less.

4. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 8, and the number of multiple slots is 12, and the flow path cross-sectional area ratio is set to 41% or less.

5. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 10, and the number of multiple slots is 15, and the flow path cross-sectional area ratio is set to 46% or less.

6. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 4, the number of multiple slots is 6, and SiC devices are used as switching elements in the inverter circuit (15) that controls the stator, and the flow path cross-sectional area ratio is set to 21% or less.

7. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 6, the number of multiple slots is 9, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 46% or less.

8. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 8, the number of multiple slots is 12, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 61% or less.

9. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 10, the number of multiple slots is 15, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 69% or less.

10. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 12, the number of multiple slots is 18, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 75% or less.

11. The rotating electric machine according to claim 1, wherein the number of multiple magnetic poles arranged in the circumferential direction of the rotor is 14, the number of multiple slots is 12, and SiC devices are used as switching elements in the inverter circuit that controls the stator, and the flow path cross-sectional area ratio is set to 81% or less.

12. The insulator comprises a plurality of insulating members (30) attached to a plurality of teeth portions, and a plurality of insulating sheets (40) attached to a plurality of teeth portions, wherein the plurality of insulating sheets include a first insulating sheet (40L) attached to a first tooth portion (20L) of adjacent teeth portions, and a second insulating sheet (40R) attached to a second tooth portion (20R) of adjacent teeth portions, wherein the first insulating sheet includes a first winding portion insulating portion (50L) that insulates adjacent winding portions, and a first bent portion (54L, 56L) that is bent from the end of the first winding portion insulating portion in the radial direction of the stator core toward the first tooth portion, and the second insulating sheet includes a second winding portion insulating portion (50R) that insulates adjacent winding portions, A rotating electric machine according to any one of claims 1 to 11, having a second bent portion (54R, 56R) that is bent from the end of the second winding portion insulating portion in the radial direction of the stator core toward the second teeth portion, wherein adjacent insulating members have clamping portions (64, 66) that clamp the portion of the first winding portion insulating portion toward the first bent portion and the portion of the second winding portion insulating portion toward the second bent portion.

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