Rotating electric machine

Abstract

To provide a rotary electric machine having a configuration in which a power conversion device is mounted in a housing such that the power conversion device can be appropriately cooled.SOLUTION: A rotary electric machine includes a rotor 30 having a rotary shaft 40, a stator 20 disposed in the outer circumference of the rotor 30, a power conversion device 50 that exchanges power with the stator 20, and a tubular housing 10 accommodating the rotor 30, the stator 20, and the power conversion device 50. The rotary shaft 40 has an extension section 41 that is formed so as to extend in the axis direction from an axial end of the rotor 30. The power conversion device 50 is disposed, in the axis direction, outside the axial end of the stator 30, and is formed so as to surround the circumference of the extension section 41. The housing 10 includes a refrigerant flow channel 11 surrounding the power conversion device 50. The extension section 41 includes a fan 60 that is disposed between the power conversion device 50 and the axial end of the stator 30, and sends air to the outside in a radial direction by rotating in accordance with rotation of the rotary shaft 40.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a rotating electric machine.

Background Art

[0002] An inverter (power conversion device) that exchanges power with a rotating electric machine needs to appropriately cool a power module or the like. In a rotating electric machine configured to house a stator, a rotor, and a power conversion device in a housing, since the heat of the stator and the rotor is likely to be transmitted to the power conversion device, a device for cooling the power conversion device is required.

[0003] [[ID=X]]Patent Document 1 discloses a configuration in which a control device having an inverter circuit is provided in a motor housing, and the control device is air-cooled by air sucked in by a cooling fan fixed to a rotating shaft through an air intake hole.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] In a configuration in which the power conversion device is air-cooled by air outside the housing as in the prior art, there is a problem that the power conversion device cannot always be appropriately cooled because the temperature of the air depends on the environmental temperature outside the housing.

[0006] An object of the present invention is to provide a rotating electric machine in which a power conversion device is housed in a housing, and the power conversion device can be more effectively cooled.

[0007] ​One aspect of the present invention is applied to a rotating electric machine comprising a rotor having a rotating shaft, a stator provided on the outer circumference of the rotor, a power converter for exchanging power with the stator, and a cylindrical housing for housing the rotor, stator, and power converter. The rotating shaft has an extension formed by extending axially from the axial end of the rotor. The power converter is positioned axially outward from the axial end of the stator and is formed to surround the extension. The housing is provided with a coolant flow path surrounding the power converter. The extension is positioned between the power converter and the axial end of the stator and includes a fan that rotates in conjunction with the rotation of the rotating shaft to blow air radially outward. The inner circumferential wall of the housing has an enlarged diameter portion that is axially outward from the axial end of the stator and outward from the inner circumferential wall. A step is formed between the inner circumferential wall and the enlarged diameter portion at the location where the stator is fixed.

[0008] According to the present invention, since the fan blows air radially outward between the power converter and the stator within the housing, heat from the stator is less likely to be transferred to the power converter. Furthermore, the air blown by the fan exchanges heat with the refrigerant flowing through the refrigerant passage in the housing, which suppresses the rise in temperature of the air inside the housing and allows the power converter to be cooled efficiently. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is an axial cross-sectional view of the rotating electric machine of this embodiment. [Figure 2] Figure 2 is a radial cross-sectional view of a rotating electric machine. [Figure 3] Figure 3 is an explanatory diagram of the area around the power converter. [Figure 4] Figure 4 is an explanatory diagram of the area around a modified power converter. [Figure 5] Figure 5 is an explanatory diagram of the area around the power converter in another modified example. [Figure 6] Figure 6 is an explanatory diagram of the area around the power converter in yet another modified example. [Figure 7] Figure 7 is an explanatory diagram of the area around the power converter in yet another modified example. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the attached drawings.

[0011] Figure 1 is an explanatory diagram of a motor 1 as a rotating electric machine according to an embodiment of the present invention, showing an axial cross-sectional view. Figure 2 is a radial cross-sectional view of the motor 1, showing the II-II cross-sectional view in Figure 1.

[0012] The motor 1 comprises a stator 20 formed in an annular shape, a rotor 30 rotatably mounted inside the stator 20, a power conversion device 50 that exchanges power with the stator 20, and a housing 10 that houses the stator 20, rotor 30, and power conversion device 50.

[0013] The motor 1 of this embodiment is mounted on an electric vehicle or a hybrid vehicle and functions as an electric motor that drives the wheels. Furthermore, the motor 1 also functions as a generator that generates electricity (regenerative braking) by receiving the driving force from the rotation of the wheels. The motor 1 may also be used in devices other than automobiles, such as drive systems for various electrical equipment or industrial machinery.

[0014] The housing 10 has a cylindrical shape, and the outer circumference of the stator 20 is fixed to the inner circumference of the housing 10 in contact with it. A cover 13 that covers the opening of the housing 10 is fixed to the axial end of the housing 10 (right side in Figure 1). The housing 10 is also provided with a cover (not shown) at the left end in Figure 1, and the inside of the housing 10 is configured as an airtight structure to prevent outside air from entering the housing 10.

[0015] The stator 20 is equipped with coils in slots (not shown). Coil ends 21 are provided protruding from both axial ends of the stator 20.

[0016] The rotor 30 is rotatably positioned inside the stator 20. The rotor 30 is coaxially equipped with a rotation shaft 40.

[0017] The rotating shaft 40 rotates coaxially with the rotor 30. An extension portion 41 extends axially outside (the right side in FIG. 1) of the axial end portion of the rotor 30 among the rotating shaft 40. The extension portion 41 is supported by the cover 13 via a bearing 45.

[0018] The power conversion device 50 is arranged axially outside of the axial end portions of the stator 20 and the rotor 30. As shown in FIG. 2, the power conversion device 50 is formed in an annular shape so as to surround the periphery of the extension portion 41. The periphery of the power conversion device 50 is covered by the housing 10.

[0019] Note that, among the inner periphery of the housing 10, the cylindrical space axially outside of the stator 20 and the rotor 30 is called a "power conversion device accommodation chamber 150" in which the power conversion device 50 is accommodated.

[0020] The housing 10 constituting the power conversion device accommodation chamber 150 is provided with a first refrigerant flow path 11. The first refrigerant flow path 11 circulates the refrigerant sent from the outside of the motor 1 and exchanges heat with the air inside the housing 10.

[0021] The housing 10 is provided with a second refrigerant flow path 12 on the outer peripheral portion of the stator 20. The second refrigerant flow path 12 cools the stator 20 from the outside by the refrigerant. The first refrigerant flow path 11 and the second refrigerant flow path 12 are configured such that the refrigerant communicates inside the housing 10.

[0022] In the power conversion device accommodation chamber 150, a fan 60 is provided on the extension portion 41 of the rotating shaft 40. The fan 60 is arranged so as to be positioned between the axial end portion of the coil end 21 of the stator 20 and the axial inner side of the power conversion device 50. The fan 60 is fixed to the extension portion 41 and is configured to blow the air inside the power conversion device accommodation chamber 150 radially outward by rotating due to the rotation of the extension portion 41 (that is, the rotation of the rotating shaft 40).

[0023] Next, the configuration of the power conversion device 50 will be described.

[0024] Figure 3 is an enlarged cross-sectional view centered on the power converter 50 of the motor 1 in this embodiment.

[0025] The power converter 50 comprises a control board 51, a power module 52, a smoothing capacitor 53, and a conductor 54. These are formed in an annular shape as described above in Figure 2 and are arranged around the extension 41 within the power converter housing chamber 150. The conductor 54 is composed of, for example, a busbar or a harness.

[0026] The power conversion device 50 is arranged by stacking the control board 51, power module 52, and smoothing capacitor 53 in that order, with slight gaps between them, using fixing members 55, from the axial end of the stator 20 toward the axial outward side (right side in Figure 3).

[0027] The control board 51 controls the operation (switching) of the power module 52. The power module 52 has multiple switching elements and converts DC power supplied from a battery (not shown) via a conductor 54 into AC power and supplies it to the coils of the stator 20. Also, during regeneration of the motor 1, it converts AC power supplied from the coils of the stator 20 into DC power and outputs regenerative power via the conductor 54. The smoothing capacitor 53 smooths the DC power flowing through the circuit.

[0028] Electrical components 51a, 51b and connector 51d are mounted on the front and back surfaces of the control board 51.

[0029] The power module 52 is equipped with coolers 52a and 52b on its front and back surfaces. The coolers 52a and 52b have multiple fins and cool the switching elements by exchanging heat with the surrounding air.

[0030] The motor 1, which includes a stator 20 and a power converter 50 within a housing 10, cools the power converter 50 by airflow from a fan 60. The housing 10 has an enlarged diameter portion 150a on the axially outward side of the inner circumferential wall of the housing 10 where the stator 20 is fitted. A stepped portion 14 is formed between the part of the inner circumferential wall of the housing 10 where the stator 20 is fixed and the enlarged diameter portion 150a. The stepped portion 14 is a wall-like structure that runs radially.

[0031] The stepped portion 14 is positioned on the inner circumferential wall of the housing 10, axially outward from the axial end of the stator 20 and axially inward from the axial end of the coil end 21.

[0032] The fan 60 blows air radially outward due to the rotation of the rotating shaft 40. The blade shape of the fan 60 is configured such that the air is blown axially inward from the axial position of the extension 41 on which the fan 60 is installed.

[0033] The airflow from the fan 60 is directed towards the inner circumferential wall of the housing 10, and after colliding with the inner circumferential wall of the enlarged diameter portion 150a, it changes direction axially. At this time, due to the presence of the stepped portion 14, the air is directed axially outward as shown by the arrow in Figure 2, making it difficult for it to flow toward the coil end 21.

[0034] The air directed axially outward by the stepped portion 14 flows axially outward along the inner circumferential wall of the housing 10. The housing 10 is equipped with fins 18 that are erected inward from the enlarged diameter portion 150a (inner circumferential wall of the housing 10) at a position surrounding the power converter 50. As shown in Figure 3, the fins 18 extend axially from the stepped portion 14 to the cover 13. Note that the fins 18 may be arranged in multiples at predetermined intervals in the circumferential direction as shown in Figure 2, or there may be only one. This makes it easier for the air blown by the fan 60 to flow axially, and increases the contact area between the air and the first refrigerant flow path 11, thereby increasing the heat exchange efficiency.

[0035] A portion of the air flowing along the inner circumferential wall of the housing 10 separates from the inner circumferential wall of the housing 10 and flows toward the inner diameter side, i.e., toward the power converter 50 side. This air flows through the air gap between the control board 51 and the power module 52, and through the air gap between the power module 52 and the smoothing capacitor 53. The air flows over the surfaces of the coolers 52a and 52b, cooling the power module 52.

[0036] The air flowing axially outward along the inner circumferential wall of the housing 10 collides with the cover 13 and moves radially inward. This air flows into the space near the extension 41 on the inner diameter side of the smoothing capacitor 53. Here, the air changes direction axially inward and returns to the fan 60. The fan 60 draws in air from near the extension 41 and blows it radially outward again.

[0037] With this configuration, the air blown by the fan 60 circulates around the power converter 50 within the power converter housing chamber 150, thereby cooling the power converter 50. The air blown by the fan 60 flows between the coil end 21 of the stator 20 and the power converter 50, forming an air curtain, which makes it difficult for heat from the coil end 21 to be transferred to the power converter 50. The air directed toward the inner circumferential wall of the power converter housing chamber 150 flows along the inner circumferential wall, and heat exchange occurs with the first refrigerant flow path 11, thereby lowering the temperature of the air circulating within the power converter housing chamber 150. As a result, the power converter 50 can be cooled more efficiently.

[0038] The airflow from the fan 60 is directed between the coil end 21 of the stator 20 and the control board 51 of the power converter 50. Here, the electrical components 51a and 51b arranged on the surface of the control board 51 facing the coil end 21 are such that the electrical components 51a (e.g., microcontrollers and surface-mount ICs) with a low standing height are placed on the inner diameter side, i.e., the side closer to the fan 60, and the electrical components 51b (e.g., transformers and coils) with a high standing height are placed on the outer diameter side, i.e., the side further from the fan 60. This configuration suppresses air pressure loss on the inner diameter side, which is the inlet for the airflow from the fan 60, and prevents air stagnation.

[0039] Similarly, on the side of the control board 51 facing the power module 52, electrical components 51a with a low standing height are arranged on the outer diameter side, i.e., the side closer to the inner circumferential wall of the housing 10, and electrical components 51b with a high standing height are arranged on the inner diameter side, i.e., the side closer to the extended portion 41. With this configuration, air pressure loss can be suppressed at the outer diameter side, which is the inlet, for the air flowing between the control board 51 and the power module 52, spaced apart from the inner circumferential wall of the housing 10.

[0040] Furthermore, as shown in Figure 2, the control board 51 is connected to the cable 51c via the connector 51d. The connector 51d is positioned so that its long side is aligned with the tangential direction of the extension 41. As a result, the cable 51c connected to the connector 51d is routed radially around the control board 51. With this configuration, the cable 51c and the connector 51d are positioned along the direction of airflow from the fan 60, thereby suppressing air pressure loss and preventing air stagnation.

[0041] Referring to Figure 3, a centrifugal clutch mechanism 61 is provided between the extension 41 of the rotating shaft 40 and the fan 60. The centrifugal clutch mechanism 61 is released when the rotational speed of the rotating shaft 40 exceeds a predetermined rotational speed (for example, 10,000 rpm), and the transmission of rotation between the extension 41 and the fan 60 is disconnected. As a result, the fan 60 stops blowing air.

[0042] When the rotational speed of motor 1 increases, the airflow from fan 60 also increases. This increases the turbulence of the air within the power converter housing chamber 150, drawing in air around the relatively high-temperature coil end 21, causing the air temperature within the power converter housing chamber 150 to rise. In contrast, by providing a centrifugal clutch mechanism 61, the airflow from fan 60 can be suppressed when the rotational speed is high, thereby suppressing the generation of turbulence within the power converter housing chamber 150. Note that the centrifugal clutch mechanism 61 is not necessarily required.

[0043] As described above, the motor 1 comprises a rotor 30 having a rotating shaft 40, a stator 20 provided on the outer circumference of the rotor 30, a power converter 50 that exchanges power with the stator 20, and a cylindrical housing 10 that houses the rotor 30, the stator 20, and the power converter 50. The rotating shaft 40 has an extension portion 41 that extends axially from the axial end of the rotor 30. The power converter 50 is positioned axially outward from the axial end of the stator 20 and is formed to surround the extension portion 41. The housing 10 is equipped with a refrigerant flow path (first refrigerant flow path 11) that surrounds the power converter 50, and the extension portion 41 is equipped with a fan 60 that is positioned between the power converter 50 and the end of the stator 20 and rotates in conjunction with the rotation of the rotating shaft 40 to blow air radially outward.

[0044] With this configuration, the fan 60 blows air radially outward between the power converter 50 and the stator 20, making it difficult for heat from the stator 20 (especially the coil ends 21) to be transferred to the power converter 50, and also making the air temperature inside the power converter housing chamber 150 in which the power converter 50 is housed uniform. Furthermore, as the air blown by the fan 60 is directed towards the inner circumferential wall of the housing 10, heat exchange occurs with the refrigerant flowing through the first refrigerant flow path 11 of the housing 10, suppressing the rise in the temperature of the air inside the housing 10, thus enabling efficient cooling of the power converter 50.

[0045] In this embodiment, the stepped portion 14 is configured to change the direction of the airflow from the fan 60 to the axially outward direction, but the stepped portion 14 is not necessarily required. When the airflow from the fan 60 collides with the inner circumferential wall of the housing 10, a portion of it is directed axially inward (left side in Figure 3), and the rest is directed axially outward (right side in Figure 3). The air directed axially inward collides with the axial end of the stator 20 and changes direction to the axially outward direction. Therefore, even in a configuration without the stepped portion 14, in other words, without the enlarged diameter portion 150a, and even if the inner diameter of the housing 10 in the power converter housing chamber 150 is the same as the outer diameter of the stator 20, the airflow from the fan 60 will change direction axially outward and flow along the inner circumferential wall of the housing 10.

[0046] Furthermore, in this embodiment, the inner circumferential wall of the housing 10 has an enlarged diameter portion 150a that is axially outward from the axial end of the stator 20 and is enlarged in diameter toward the outer side of the inner circumferential wall, and a stepped portion 14 is formed between the inner circumferential wall and the enlarged diameter portion 150a at the location where the stator 20 is fixed.

[0047] With this configuration, the airflow from the fan 60 is redirected axially outward by the stepped portion 14 on the inner circumferential wall of the housing 10, making it easier for the air to flow axially outward along the inner circumferential wall of the power converter housing chamber 150.

[0048] Furthermore, in this embodiment, a coil end 21 is provided projecting outward in the axial direction from the axial end of the stator 20, and the stepped portion 14 is positioned in the axial direction between the axial end of the stator 20 and the axial end of the coil end 21.

[0049] This configuration allows for a larger area where the airflow from the fan 60 collides with the inner wall of the housing 10, thereby suppressing turbulence and preventing air from being drawn into high-temperature parts such as the coil ends 21 of the stator 20 and sent to the power converter 50.

[0050] Furthermore, in this embodiment, the housing 10 is provided with fins 18 that are erected inward from the inner circumferential wall at a position surrounding the power converter 50, and the fins 18 extend in the axial direction.

[0051] This configuration increases the contact area between the air flowing along the inner circumferential wall of the housing 10 and the first refrigerant flow path 11, thereby further promoting air cooling.

[0052] Furthermore, in this embodiment, the power conversion device 50 comprises a control board 51, a power module 52, and a smoothing capacitor 53. The control board 51, power module 52, and smoothing capacitor 53 are stacked and arranged from the axial end side of the stator 20. On the surface of the control board 51 facing the stator 20, the upright height increases from the radially inner side to the radially outer side.

[0053] With this configuration, the airflow from the fan 60 is not obstructed by the electrical components 51a and 51b between the power converter 50 and the stator 20, thereby suppressing pressure loss of air and preventing air stagnation.

[0054] In this embodiment, a cable 51c is connected to the control board 51, and the cable 51c is routed along the surface of the control board 51 from the radially inner side to the radially outer side.

[0055] With this configuration, the cable 51c is positioned along the direction of airflow from the fan 60, thereby suppressing air pressure loss and preventing air stagnation.

[0056] Furthermore, in this embodiment, the fan 60 is configured to blow air radially outward toward the stator 20 side from the axial position where the fan 60 is installed.

[0057] This configuration makes it easier for the airflow from the fan 60 to come into contact with the stepped portion 14 on the inner circumferential wall of the housing 10, thereby suppressing the generation of turbulence on the inner circumferential wall of the housing 10 and making it easier to change the direction of the airflow outward in the axial direction.

[0058] In this embodiment, the fan 60 is fixed to the extension 41 via a centrifugal clutch mechanism 61, and the centrifugal clutch mechanism 61 disconnects the transmission of rotation from the extension 41 to the fan 60 when the rotational speed of the rotating shaft 40 exceeds a predetermined rotational speed.

[0059] With this configuration, when the rotational speed of the rotating shaft 40 is high, the airflow from the fan 60 is suppressed, thereby preventing an increase in the generation of turbulence within the power conversion device housing chamber 150.

[0060] Next, a modified example of this embodiment will be described.

[0061] Figure 4 is an enlarged cross-sectional view centered on the power converter 50 of the motor 1, which is a modified example of this embodiment.

[0062] The modified example shown in Figure 4 is characterized by having an upright portion 15a formed by an annular member 15 instead of the stepped portion 14.

[0063] In the power converter housing chamber 150, a groove 10a is formed in the inner circumferential wall of the housing 10 along the circumferential direction. An annular member 15 is fitted into the groove 10a. With this configuration, an upright portion 15a (first upright portion) is formed from the inner circumferential wall of the housing 10, with the annular member 15 rising inward.

[0064] The upright portion 15a is positioned on the inner circumferential wall of the housing 10, similar to the stepped portion 14 described above in Figure 3, at a location that is axially outward from the axial end of the stator 20 and axially inward from the axial end of the coil end 21.

[0065] Thus, even without forming an enlarged diameter portion 150a on the inner circumferential wall of the housing 10, and by forming an upright portion 15a with the groove portion 10a and the annular member 15, the air blown from the fan 60 and colliding with the inner circumferential wall of the housing 10 is redirected axially outward by the upright portion 15a and flows axially outward along the inner circumferential wall of the housing 10.

[0066] Thus, in this modified embodiment, a groove 10a is formed in the inner circumferential wall of the housing 10 axially outward from the axial end of the stator 20, along the circumferential direction, and an annular member 15 is fitted into the groove 10a, thereby forming an upright portion 15a (first upright portion) that rises inward from the inner circumferential wall of the housing 10. As a result, the airflow from the fan 60 can be directed axially outward by the upright portion 15a.

[0067] Figure 5 is an enlarged cross-sectional view centered on the power converter 50 of the motor 1, which is another modified example of this embodiment.

[0068] In the motor 1 shown in Figure 5, a stepped portion 14a is formed in the inner circumferential wall of the housing 10 between the portion where the stator 20 is fixed and the enlarged diameter portion 150a. The stepped portion 14a is formed with an inclination such that the inner circumferential wall of the housing 10 expands radially outward as it moves axially outward. This inclination is formed at an obtuse angle of 90 degrees or more with respect to the inner circumferential wall of the housing 10.

[0069] In this way, by forming the stepped portion 14a at an inclination with respect to the inner circumferential wall, the air blown from the fan 60 can more easily change direction axially outward due to the stepped portion 14a. As a result, compared to the stepped portion 14 shown in Figure 3, air pressure loss and turbulence generation are reduced, and the cooling of the power converter 50 can be further promoted.

[0070] Thus, in this modified embodiment, the stepped portion 14a is formed with an inclination that expands radially outward as it moves axially outward. As a result, the air blown from the fan 60 can more easily change direction axially outward by the inclined stepped portion 14a, while reducing pressure loss and turbulence.

[0071] Figure 6 is an enlarged cross-sectional view centered on the power converter 50 of the motor 1, which is yet another modified example of this embodiment.

[0072] The motor 1 shown in Figure 6 is a modified version of the configuration shown in Figure 4. The upright portion 16a (first upright portion) formed by the annular member 16 fitted into the groove 10a of the inner circumferential wall of the power converter housing chamber 150 is configured as an inclined portion 16b that inclins so as it moves axially outward, it expands radially outward. The inclined portion 16b is formed at an obtuse angle such that it is 90 degrees or more relative to the inner circumferential wall of the housing 10.

[0073] By forming the inclined portion 16b, which is composed of the annular member 16, at an angle to the inner circumferential wall in this manner, the air blown from the fan 60 can more easily change direction axially outward, similar to the modified example shown in Figure 5. As a result, compared to the upright portion 15a shown in Figure 4, air pressure loss and turbulence generation are reduced, and the cooling of the power converter 50 can be further promoted.

[0074] Figure 7 is an enlarged cross-sectional view centered on the power converter 50 of the motor 1, which is yet another modified example of this embodiment.

[0075] The motor 1 shown in Figure 7 is a modified version of the configuration shown in Figure 3, and in the enlarged diameter portion 150a of the power conversion device housing chamber 150, a groove portion 10b and an annular member 17 fitted into the groove portion 10b are provided at a position between the control board 51 and the power module 52 in the axial direction. The annular member 17 is configured as an upright portion 17a (second upright portion) that stands upright on the inner circumferential wall of the power conversion device housing chamber 150, and has an inclined portion 17b that is formed at an obtuse angle so as it moves radially inward as it moves axially outward.

[0076] By providing an inclined portion 17b on the inner circumferential wall of the housing 10 at a position between the control board 51 and the power module 52, a portion of the air flowing axially along the inner circumferential wall of the power converter housing chamber 150 can be circulated between the control board 51 and the power module 52. This allows air to flow actively over the surface of the cooler 52a of the power module 52, thereby further promoting the cooling of the power module 52.

[0077] Thus, in this modified embodiment, the inner circumferential wall of the housing 10, at the location facing the power module 52, has a second upright portion (upright portion 17a) that rises inward from the inner circumferential wall, and the upright portion 17a has an inclined portion 17b whose upright height increases as it moves outward in the axial direction, so that a portion of the air flowing axially along the inner circumferential wall of the housing 10 can be circulated towards the power module 52.

[0078] The configuration shown in Figure 7 has a stepped portion 14 similar to the configuration shown in Figure 3, but is not limited to this. A configuration with an upright portion 15a instead of the stepped portion 14 (Figure 4), a configuration with an inclined stepped portion 14a (Figure 5), or a configuration with an upright portion 16a having an inclined portion 16b (Figure 6) may also be provided with an upright portion 17a and an inclined portion 17b.

[0079] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0080] The fan 60 in this embodiment can be configured in any way as long as it blows air radially outward by the rotation of the rotating shaft 40, for example, a sirocco fan or a centrifugal fan can be used.

[0081] Furthermore, the annular members 15, 16, and 17 of this embodiment may be made of an annular metal material and have a notch formed in one of them so that they can be easily fitted into the grooves 10a and 10b. [Explanation of Symbols]

[0082] 1: Motor, 10: Housing, 10a: Groove, 11: First refrigerant flow path, 14: Stepped section, 14a: Stepped section, 15: Annular member, 15a: Upright section, 16: Annular member, 16a: Upright section, 17: Annular member, 17a: Upright section, 17b: Inclined section, 18: Fin, 20: Stator, 21: Coil end, 30: Rotor, 40: Rotating shaft, 41: Extension section, 50: Power converter, 51: Control board, 51a, 51b: Electrical components, 51c: Cable, 51d: Connector, 52: Power module, 52a, 52b: Cooler, 53: Smoothing capacitor, 54: Conductor, 60: Fan, 61: Centrifugal clutch mechanism, 150: Power converter housing, 150a: Enlarged diameter section

Claims

1. A rotating electric machine comprising a rotor having a rotating shaft, a stator provided on the outer circumference of the rotor, a power conversion device for exchanging power with the stator, and a cylindrical housing for housing the rotor, the stator, and the power conversion device, The rotating shaft has an extended portion formed by extending axially from the axial end of the rotor, The power conversion device is positioned axially outward from the axial end of the stator and is formed to surround the extension portion. The housing is provided with a refrigerant flow path so as to surround the power converter, The extension portion is positioned between the power converter and the axial end of the stator and includes a fan that rotates in conjunction with the rotation of the rotating shaft to blow air radially outward. The inner circumferential wall of the housing has an enlarged diameter portion that is axially outward from the axial end of the stator and outward from the inner circumferential wall, and a stepped portion is formed between the inner circumferential wall and the enlarged diameter portion at the location where the stator is fixed. Rotating electric machine.

2. A rotating electric machine comprising: a rotor having a rotating shaft; a stator provided on the outer circumference of the rotor; a power conversion device for exchanging power with the stator; and a cylindrical housing for housing the rotor, the stator, and the power conversion device, The rotating shaft has an extended portion formed by extending axially from the axial end of the rotor, The power conversion device is positioned axially outward from the axial end of the stator and is formed to surround the extension portion. The housing is provided with a refrigerant flow path so as to surround the power converter, The extension portion is positioned between the power converter and the axial end of the stator and includes a fan that rotates in conjunction with the rotation of the rotating shaft to blow air radially outward. The inner circumferential wall of the housing has a groove formed along the circumferential direction, axially outward from the axial end of the stator, and a first upright portion is formed that rises inward from the inner circumferential wall by fitting an annular member into the groove. Rotating electric machine.

3. A rotating electric machine according to claim 1, The stator is provided with coil ends protruding outward in the axial direction at its axial end. The stepped portion is positioned such that its axial position is between the axial end of the stator and the axial end of the coil end. Rotating electric machine.

4. A rotating electric machine according to claim 1, The stepped portion is formed with an inclination such that it expands radially outward as it moves axially outward. Rotating electric machine.

5. A rotating electric machine according to claim 1, The housing is provided with fins erected inward from the inner circumferential wall at a position surrounding the power converter, The fin extends in the axial direction. Rotating electric machine.

6. A rotating electric machine comprising: a rotor having a rotating shaft; a stator provided on the outer circumference of the rotor; a power conversion device for exchanging power with the stator; and a cylindrical housing for housing the rotor, the stator, and the power conversion device, The rotating shaft has an extended portion formed by extending axially from the axial end of the rotor, The power conversion device is positioned axially outward from the axial end of the stator and is formed to surround the extension portion. The housing is provided with a refrigerant flow path so as to surround the power converter, The extension portion is positioned between the power converter and the axial end of the stator and includes a fan that rotates in conjunction with the rotation of the rotating shaft to blow air radially outward. The aforementioned power converter is It comprises a control board, a power module, and a smoothing capacitor, The control board, the power module, and the smoothing capacitor are arranged in a stacked manner from the axial end side of the stator. On the control board, electrical components are mounted such that the upright height increases from the radially inward to the radially outward direction on the surface of the control board facing the stator. Rotating electric machine.

7. A rotating electric machine according to claim 6, A cable is connected to the control board. The cable is routed along the surface of the control board, from the radially inward direction to the radially outward direction. Rotating electric machine.

8. A rotating electric machine according to claim 6, The inner circumferential wall of the housing, in the portion facing the power module, has a second upright portion that rises inward from the inner circumferential wall. The second upright portion has an inclined portion in which the upright height increases as it moves outward in the axial direction. Rotating electric machine.

9. A rotating electric machine according to claim 3, The fan is configured to blow air radially outward toward the stator side, relative to the axial position where the fan is installed. Rotating electric machine.

10. A rotating electric machine comprising: a rotor having a rotating shaft; a stator provided on the outer circumference of the rotor; a power conversion device for exchanging power with the stator; and a cylindrical housing for housing the rotor, the stator, and the power conversion device, The rotating shaft has an extended portion formed by extending axially from the axial end of the rotor, The power conversion device is positioned axially outward from the axial end of the stator and is formed to surround the extension portion. The housing is provided with a refrigerant flow path so as to surround the power converter, The extension portion is positioned between the power converter and the axial end of the stator and includes a fan that rotates in conjunction with the rotation of the rotating shaft to blow air radially outward. The fan is fixed to the extension via a centrifugal clutch mechanism. The centrifugal clutch mechanism disconnects the transmission of rotation from the extension to the fan when the rotational speed of the rotating shaft exceeds a predetermined rotational speed. Rotating electric machine.

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