JP2010239775A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine with a liquid cooling mechanism that is structured so that a coolant may permeate to more sections of a coil. <P>SOLUTION: A stator 3 of a motor 1 includes a stator core 33, a bobbin (34A and 34B), and a coil 35. The bobbin includes bobbin parts 34A and 34B which are mounted to sandwich the stator core 33. The bobbin member 34A includes a bobbin center 51, an inner vane 52, and an outer vane 53. The outer vane 53 has a supply hole 50 which radially pierces the motor 1. A stator 2 is so structured as to supply a coolant to the supply hole 50 in the outer vane 52. To the bobbin member 34A, a coil cover 34C which covers the opposite side of the coil 35 across the stator core 33 is mounted so that the supply hole 50 in the outer vane 53 may be positioned between the coil cover 34C and the bobbin center 51. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly to a liquid cooling mechanism for circulating a liquid refrigerant in a liquid-cooled rotating electrical machine.

  A drive motor of a hybrid vehicle or an electric vehicle may be provided with a liquid cooling mechanism using a liquid refrigerant in order to remove heat generated during operation. Most typically, a water cooling mechanism for supplying coolant from the radiator is provided, and heat generation from the drive motor is removed by this water cooling mechanism. In recent years, the use of cooling oil as a refrigerant has been studied in order to satisfy the demand for downsizing the cooling mechanism associated with the downsizing and weight reduction of vehicles.

  Various liquid cooling techniques for motors are known. For example, Japanese Patent Laid-Open No. 4-364343 discloses a technique in which a cover member is attached to the front end and the rear end of a stator via an O-ring, and a flow path for liquid refrigerant is formed by the cover member. Japanese Patent Application Laid-Open No. 2004-112856 discloses a cooling structure that closes the opening of the slot to make the slot a passage through which a refrigerant can flow. In the motor disclosed in this publication, the stator is fixed to the case by a case fixing member.

  One requirement in the design of the liquid cooling mechanism is an improvement in cooling efficiency, particularly an improvement in the cooling efficiency of the winding. The main heat source of the motor is a winding, and cooling of the winding is one of the important factors for improving the reliability of the motor. For this purpose, it is desirable that the liquid cooling mechanism is configured so that the liquid refrigerant spreads over the entire winding. Furthermore, it is desirable that the demand for improvement in cooling efficiency be realized with a structure that can be assembled with a small number of man-hours. Such a requirement applies to both the motor and the generator, that is, to the rotating electrical machine in common.

JP-A-4-364343 JP 2004-112856 A

  Accordingly, an object of the present invention is to provide a rotating electrical machine including a liquid cooling mechanism configured to allow liquid refrigerant to spread over a larger portion of a winding.

  In order to achieve the above object, the present invention employs the means described below. In the description of the means, in order to clarify the correspondence between the description of [Claims] and the description of [Mode for carrying out the invention], it is used in [Mode for carrying out the invention]. Number and code are added. However, the appended numbers and symbols should not be used to limit the technical scope of the invention described in [Claims].

  The liquid-cooled rotating electrical machine (1) of the present invention includes a rotor (2) and a stator (3). The stator (3) includes a stator iron core (33), bobbins (34A, 34B) provided on the stator iron core (33), and windings (35) wound around the bobbins (34A, 34B), respectively. It has. The bobbins (34A, 34B) include a first bobbin member (34A) and a second bobbin member (34B) mounted so as to sandwich the stator iron core (33). The first bobbin member (34A) is joined to the first bobbin center (51) disposed along the stator teeth (33b) of the stator iron core (33) and the first bobbin center (51), and the rotor (2). A first inner blade portion (52) opposed to the first bobbin center (51) at a position radially outward of the rotating electrical machine (1) from the first inner blade portion (52). Part (53). The first outer blade portion (53) has a supply hole (50) that penetrates in the radial direction of the rotating electrical machine (1) and communicates with the winding (35). The stator (2) is configured to supply a liquid refrigerant to the supply hole (50) of the first outer blade portion (52). The first bobbin member (34A) of each of the bobbins (34A, 34B) has a winding cover (34C) covering the opposite side of the stator core (33) of the winding (35) to the first inner blade portion (52). ) And the first outer blade portion (53). The winding cover (34C) includes a first bobbin member (34A) such that the supply hole (50) of the first outer blade portion (53) is positioned between the winding cover (34C) and the first bobbin center (51). ).

  In such a configuration, the winding cover (34C) attached to the bobbins (34A, 34B) directs the flow of the liquid refrigerant supplied to the supply hole (50) toward the winding (35), and the liquid refrigerant is wound. Go across more parts of the line. Thereby, the cooling efficiency is effectively improved.

  In order to spread the liquid refrigerant to a larger part of the winding (35), it is desirable that the winding cover (34C) is curved along the winding (35).

  The stator (3) further includes a housing (31) that houses the stator core (33), the bobbins (34A, 34B) and the winding (35), and a cover (32) that covers the opening of the housing (31), The second bobbin member (34B) is joined to the second bobbin center (54) disposed along the stator teeth (33b) of the stator iron core (33), and the second bobbin center (54), and the rotor (2) A second inner blade portion (55) that faces the second bobbin center (54) at a position radially outward of the rotating electrical machine (1) relative to the second inner blade portion (55). When the portion (56) is provided, the housing (31), the cover (32), the first and second inner blade portions (52, 55), the liquid refrigerant is the first and second inner blade portions (52, 55). Configured to not penetrate inside) It is preferable that the annular forming a space dense liquid structure. With such a configuration, the flow path of the cooling refrigerant can be formed with fewer man-hours.

  The supply hole (50) of the first outer blade portion (52) of the first bobbin member (34A) is located closer to the housing (31) than the stator core, and the lead wire (35a) of the winding (35). Is arranged closer to the cover (32) than the stator core (33), the weir member (40) made of an elastic material covers the cover (32) side of the winding (35). It is preferable to arrange | position. Such a configuration allows the liquid refrigerant to spread over more parts of the winding.

  In one embodiment, a nozzle ring (36) is provided inside the housing (31), and a supply port (31a) through which liquid refrigerant is supplied is provided in the housing (31). In this case, the nozzle ring (36) distributes the liquid refrigerant supplied from the supply port (31a) in the circumferential direction of the rotating electrical machine, and supplies it in the radial direction to the supply hole (50) of the first bobbin member (34A). It is preferable.

  According to the present invention, the liquid refrigerant spreads over more portions of the winding, and the cooling efficiency of the liquid cooling mechanism of the rotating electrical machine is improved.

FIG. 1 is a cross-sectional view showing the structure of a motor according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the motor of FIG. 3A is a cross-sectional view showing the structure of the nozzle ring and bobbin of the motor of FIG. FIG. 3B is a cross-sectional view showing the structure of the nozzle ring. FIG. 4A is a front view of the weir member viewed from the axial direction. FIG. 4B is a cross-sectional view showing the structure of the weir member. FIG. 5 is a front view of the stator core as viewed in the axial direction. FIG. 6A is a perspective view showing a structure of a stator iron core and a bobbin. FIG. 6B is a perspective view showing the structure of the stator iron core and the bobbin. FIG. 6C is a perspective view showing the structure of the stator iron core and the bobbin. FIG. 6D is a perspective view illustrating a structure of a stator iron core and a bobbin. FIG. 7A is a front view of the bobbin as viewed in the axial direction from the housing side. FIG. 7B is a rear view of the bobbin as viewed in the axial direction from the cover side. FIG. 7C is a side view of the bobbin as seen in the circumferential direction. FIG. 7D is a view of the outer blade portion of the bobbin as seen from the bobbin center side after cutting the bobbin center. FIG. 7E is a view of the inner blade portion of the bobbin as seen from the bobbin center side after cutting the bobbin center. FIG. 7F is a diagram illustrating a structure of a supply hole provided in the outer blade portion of the bobbin. FIG. 8 is a perspective view showing the structure of the bobbin and the winding cover. FIG. 9A is a top view of the winding cover as seen from the outside in the radial direction of the motor. FIG. 9B is a front view of the winding cover as viewed in the axial direction from the housing side. FIG. 10 is a diagram illustrating a state where the winding cover is inserted into the bobbin. FIG. 11A is a front view of the bobbin as viewed in the axial direction from the housing side. FIG. 11B is a rear view of the bobbin as viewed in the axial direction from the cover side. FIG. 11C is a side view of the bobbin as seen in the circumferential direction. FIG. 12 is a cross-sectional view illustrating the assembly process of the motor of this embodiment.

  FIG. 1 is a cross-sectional view showing the structure of a motor 1 in one embodiment of the present invention, and FIG. 2 is an enlarged view thereof. 1 and 2 show a cross section including the central axis 1a of the motor 1. FIG. In this specification, a direction parallel to the central axis 1a is described as an axial direction, a direction perpendicular to the central axis 1a is described as a radial direction, and a direction around the central axis 1a is described as a circumferential direction. 1 and 2, an arrow 6 indicates the upward in the vertical direction. In the present embodiment, the central axis 1a is perpendicular to the vertical direction.

  The motor 1 of the present embodiment is generally composed of a rotor 2 and a stator 3.

  The rotor 2 includes a shaft 21, a retainer 22, a rotor iron core 23, and a field magnet 24. The retainer 22 fixes the rotor core 23 to the shaft 21. The rotor core 23 has an opening extending in the axial direction, and the field magnet 24 is inserted into the opening. In the present embodiment, a permanent magnet is used as the field magnet 24.

  The stator 3 includes a housing 31, a cover 32, a stator iron core 33, bobbin members 34 </ b> A and 34 </ b> B, and a winding 35.

  The housing 31 and the cover 32 are structural members for supporting each mechanism of the motor 1. The housing 31 accommodates the stator iron core 33, the bobbin members 34A and 34B, and the winding 35, and holds these members at desired positions. Further, the housing 31 is provided with a bearing 4, the cover 32 is provided with a bearing 5, and the shaft 21 of the rotor 2 is rotatably held by the bearings 4 and 5. The cover 32 is disposed so as to cover the opening of the housing 31. The cover 32 is fixed to the housing 31 by bolts 37. Although only one bolt 37 is shown in FIG. 1, an appropriate number of bolts 37 is actually used to fix the cover 32 to the housing 31.

  The housing 31 is provided with a supply port 31a through which cooling oil is supplied from the outside, and a discharge port 31b for discharging the cooling oil. For example, ATF (automatic transmission fluid: ATF is a registered trademark of Idemitsu Kosan) is preferably used as the cooling oil. Other liquid refrigerants other than cooling oil can also be used. As will be described later, the cooling oil supplied to the supply port 31a passes through the refrigerant passage formed so as to pass through the winding 35 and is discharged from the discharge port 31b. In the present embodiment, the supply port 31 a is provided at the highest position of the housing 31, and the discharge port 31 b is provided at the lowest position of the housing 31.

  As shown in FIG. 2, a nozzle ring 36 is fitted in the housing 31. As shown in FIG. 3A, the nozzle ring 36 has an annular shape centered on the central axis 1 a of the motor 1. As shown in FIG. 3B, the nozzle ring 36 is provided with an annular groove 36a on the outer surface, and as shown in FIG. 3A, the nozzle ring 36 is extended radially from the groove 36a. A supply hole 36 b that penetrates 36 and reaches the inner surface is provided. As will be described later, the groove 36a of the nozzle ring 36 serves to circulate cooling oil for cooling the winding 35 in the circumferential direction, and the supply hole 36b supplies cooling oil to the winding 35 in the radial direction. To play a role. In this embodiment, the groove 36a of the nozzle ring 36 and the housing 31 form a flow path for circulating cooling oil in the circumferential direction. However, a flow path that penetrates the nozzle ring 36 itself in the circumferential direction is formed. Also good.

  Referring to FIG. 2 again, the stator core 33 is sandwiched between the bobbin members 34A and 34B. A bobbin around which the winding 35 is wound is formed by the pair of bobbin members 34A and 34B. The bobbin members 34 </ b> A and 34 </ b> B are structures used to facilitate the process of winding the winding 35 around the stator core 33 while ensuring the insulation between the stator core 33 and the winding 35. The bobbin members 34A and 34B can be formed of an insulating resin such as an engineer plastic. As shown in FIG. 3A, the set of the stator iron core 33, bobbin members 34 </ b> A and 34 </ b> B, and the winding 35 is arranged side by side in the circumferential direction of the motor 1.

  Referring again to FIG. 1, a lead wire 35 a for supplying a current to the winding 35 is led out to the outside from the cover 32 side of the winding 35 through a hole provided in the housing 31. The bobbin member 34 </ b> A is provided with a supply hole 50 that penetrates the motor 1 in the radial direction. The supply hole 50 serves to supply the cooling oil supplied from the supply hole 36 b of the nozzle ring 36 to the winding 35.

  The bobbin members 34A and 34B are sandwiched and held by the housing 31 and the cover 32. Specifically, the housing 31 is provided with a groove, and the end of the bobbin member 34A is inserted into the groove. Similarly, the cover 32 is also provided with a groove, and the end of the bobbin member 34B is inserted into the groove. In order to improve the sealing performance, a packing 38a is inserted between the housing 31 and the bobbin member 34A, and similarly, a packing 38b is inserted between the cover 32 and the bobbin member 34B. If there is no problem of sealing performance, it is possible that the packings 38a and 38b are not inserted.

  The bobbin member 34A is fitted with a winding cover 34C formed of an insulating resin. The winding cover 34 </ b> C is provided to face the winding 35 on the surface of the winding 35 opposite to the stator core 33. As will be described later, the winding cover 34C is used to control the path through which the cooling oil supplied to the supply hole 50 of the bobbin member 34A flows and to increase the cooling efficiency of the winding 35. The structures and functions of the bobbin members 34A and 34B and the winding cover 34C will be described in detail later.

  A retainer 39 is fitted in the housing 31 in order to fix the stator core 33 more firmly. The stator core 33 is sandwiched between the nozzle ring 36 and the retainer 39, thereby fixing the stator core 33.

  Further, a packing 38c is inserted between the bobbin 34B and the retainer 39. This packing 38c is for preventing leakage of cooling oil in the axial direction from the overlapping surface of bobbins 34B adjacent in the circumferential direction. The space between the bobbin 34B and the retainer 39 is sealed by the packing 38c to form a dense liquid structure.

  A dam member 40 is provided on the side of the winding 35 from which the lead wire 35a is drawn. The dam member 40 is formed of an insulating elastic material. 4A and 4B are diagrams showing the structure of the weir member 40. FIG. Here, FIG. 4A is a view of the weir member 40 viewed from the stator iron core 33 in the axial direction, and FIG. 4B is a cross-sectional view of the weir member 40. As shown in FIG. 4A, the weir member 40 has an annular shape, and its cross-sectional shape is L-shaped. The weir member 40 includes a base portion 40a and a side surface portion 40b. The side surface portion 40b is provided so as to extend in the axial direction of the motor 1 from the radially outer end of the base portion 40a. The weir member 40 is disposed such that the base portion 40a is located opposite to the lead wire 35a side of the winding 35, and the side surface portion 40b extends from the base portion 40a toward the stator core 33. As will be described later, the weir member 40 is used to control the flow of the cooling oil and improve the cooling efficiency of the winding 35. The operation of the weir member 40 will be described later in detail.

  Next, the structure of the stator iron core 33, the bobbin members 34A and 34B, and the winding cover 34C will be described in detail.

  FIG. 5 is a front view of one stator core 33 as seen from the axial direction. The stator iron core 33 is roughly composed of an outer peripheral portion 33a and stator teeth 33b. When the plurality of stator cores 33 are arranged in the circumferential direction, an annular magnetic path is formed by the outer peripheral portion 33a. A space 33c formed between the stator teeth 33b of the adjacent stator cores 33 becomes a slot. The stator core 33 is typically configured by laminating electromagnetic steel sheets punched into a desired shape.

  6A to 6D are perspective views illustrating the structure of the stator iron core 33 and the bobbin members 34A and 34B. Specifically, FIG. 6A is a perspective view of the stator core 33 and the bobbin members 34A and 34B as viewed from the inside of the motor 1 in a state where the bobbin members 34A and 34B are attached to the stator core 33 halfway. FIG. 5 is a perspective view of the stator core 33 and the bobbin members 34A, 34B as viewed from the inside of the motor 1 in a state where the bobbin members 34A, 34B are completely attached to the stator core 33. 6C is a perspective view of the stator core 33 and the bobbin members 34A and 34B as viewed from the outside of the motor 1 in a state where the bobbin members 34A and 34B are attached to the stator core 33 halfway, and FIG. 3 is a perspective view of the stator core 33 and the bobbin members 34A, 34B as viewed from the outside of the motor 1 in a state where the bobbin members 34A, 34B are completely attached to the stator core 33.

  As shown in FIGS. 6A to 6D, the bobbin member 34A is roughly composed of a bobbin center 51, an inner blade portion 52, and an outer blade portion 53, and the inner blade portion 52 and the outer blades. The part 53 is connected to the bobbin center 51. Similarly, the bobbin member 34 </ b> B is generally configured by a bobbin center 54, an inner blade part 55, and an outer blade part 56, and the inner blade part 55 and the outer blade part 56 are connected by the bobbin center 54. . As shown in FIGS. 6B and 6D, when the bobbin members 34A and 34B are completely attached to the stator core 33, the periphery of the stator teeth 33b is surrounded by the bobbin centers 51 and 54. The winding 35 is wound in contact with the outside of bobbin centers 51 and 54 provided around the stator teeth 33b. The inner blade portions 52 and 55 and the outer blade portions 53 and 56 of the bobbin members 34A and 34B are provided so as to protrude from the end portions of the bobbin centers 51 and 54 to the side opposite to the stator core 33, and the winding 35 It plays the role which makes the operation | work which winds the coil | winding 35 by guiding.

  7A to 7F are views showing the structure of the bobbin member 34A in detail. Specifically, FIG. 7A is a front view of the bobbin member 34A viewed from the housing 31 side in the axial direction, and FIG. 7B is a rear view of the bobbin member 34A viewed from the cover 32 side in the axial direction. FIG. 7C is a view of the bobbin member 34 </ b> A viewed from the circumferential direction of the motor 1. 7D is a view in which the bobbin member 34A is cut at the bobbin center 51 and the outer blade portion 53 is viewed from the bobbin center 51 side, and FIG. 7E is a view in which the bobbin member 34A is cut at the bobbin center 51. It is the figure which looked at the inner blade | wing part 52 from the center 51 side. Finally, FIG. 7F is a view of a part of the outer blade portion 53 as viewed from the outside of the motor 1.

  As shown in FIG. 7A, a supply hole 50 is provided in the outer blade portion 53 of the bobbin member 34A. The supply hole 50 penetrates the outer blade 53 in the radial direction of the motor 1 and, as described above, supplies the cooling oil in the radial direction from the nozzle ring 36 to the winding 35 wound around the bobbin member 34A. Plays. The cross-sectional shape of the supply hole 50 is switched inside the outer blade portion 53. As shown in FIGS. 7A and 7F, the cross-sectional shape of the supply hole 50 is circular on the outer surface of the outer blade portion 53, and is oval on the inner surface of the outer blade portion 53.

  The outer surface of the outer blade portion 53 of the bobbin member 34A has a shape in which the cross section forms an arc. The outer surface of the outer blade portion 53 having such a shape is pressed against the inner side of the nozzle ring 36 when the bobbin member 34 </ b> A is incorporated in the housing 31 of the motor 1. In addition, the supply hole 50 of the bobbin member 34 </ b> A is provided at a position corresponding to the supply hole 36 b of the nozzle ring 36. With such a structure, the cooling oil is supplied to the supply hole 50 from the supply hole 36b of the nozzle ring 36 to the bobbin member 34A.

  2 and 8, the bobbin member 34A has a structure in which the winding cover 34C can be inserted between the inner blade portion 52 and the outer blade portion 53 from the housing 31 side. is doing. 9A and 9B are diagrams showing the shape of the winding cover 34C. Specifically, FIG. 9A is a view of the winding cover 34C as viewed from the outside of the motor 1 in the radial direction, and FIG. 9B is a view of the winding cover 34C as viewed from the housing 31 in the axial direction. The winding cover 34 </ b> C generally includes a front part 61 and side parts 62 and 63. The connecting portions between the side portions 62 and 63 and the front portion 61 are rounded, and the side portions 62 and 63 are smoothly connected to the front portion 61. The winding cover 34 </ b> C has a shape such that the side portions 62 and 63 become narrower toward the inner side in the radial direction of the motor 1.

  As shown in FIG. 7C, in order to fix the winding cover 34C fitted to the bobbin member 34A to the bobbin member 34A, the surface on the bobbin center 51 side of the outer blade portion 53 of the bobbin member 34A (the central axis 1a The protrusion 57 and the step 58 are provided on the surface of the inner blade 52, and the protrusion 59 and the step 60 are provided on the outer surface of the inner blade 52 (the surface opposite to the central axis 1a). As illustrated in FIG. 7D, the protrusion 57 is provided at a position along the step 58 of the outer blade 53. Similarly, as illustrated in FIG. 7E, the protruding portion 59 is provided at a position along the step 60 of the inner blade portion 52.

  FIG. 10 is a view of the outer blade portion 53 viewed from the bobbin center 51 side by cutting the bobbin center 51 and the winding cover 34C of the bobbin member 34A in a state where the winding cover 34C is fitted to the bobbin member 34A. . When the winding cover 34C is fitted to the bobbin member 34A, the outer blade 53 side end of the winding cover 34C is pressed against the step 58 of the outer blade 53, and the inner blade 52 side of the winding cover 34C. Is pressed against the step 60 of the inner blade portion 52. The protrusion 57 of the outer blade 53 and the protrusion 59 of the inner blade 52 serve to prevent the winding cover 34C from being detached from the bobbin member 34A after the winding cover 34C is fitted to the bobbin member 34A. .

  On the other hand, FIGS. 11A to 11C are views showing the structure of the bobbin member 34B. Specifically, FIG. 11A is a front view of the bobbin member 34B viewed from the housing 31 side in the axial direction, and FIG. 11B is a rear view of the bobbin member 34A viewed from the cover 32 side in the axial direction. FIG. 11C is a view of the bobbin member 34 </ b> B viewed from the circumferential direction of the motor 1. The bobbin member 34B has substantially the same shape as the bobbin member 34A. However, the inner blade portion 55 and the outer blade portion 56 are not provided with a step or a protrusion.

The motor 1 of the present embodiment having the above-described configuration is roughly assembled by the following procedure.
First, the bobbin members 34A and 34B are fitted into the stator iron cores 33, and the winding 35 is wound around the bobbin members 34A and 34B. On the other hand, the nozzle ring 36 is fitted in the housing 31.

  Subsequently, the bobbin member 34 </ b> A is inserted into a groove provided in the housing 31, and the stator core 33 and the bobbin members 34 </ b> A and 34 </ b> B around which the winding 35 is wound are fitted into the housing 31. At this time, the bobbin members 34A and 34B are arranged side by side in the circumferential direction. The inner blade portions 52 of the two adjacent bobbin members 34A are closely arranged so that the cooling oil does not leak. Similarly, the inner blade portions 55 of the two adjacent bobbin members 34B do not leak the cooling oil. Closely arranged. The inner blade portions 52 and 55 of the bobbin members 34A and 34B attached to the stator cores 33 are also closely arranged so that the cooling oil does not leak. At this time, it should be noted that the lead wire 35 a of the winding 35 is located on the opening side of the housing 31. Further, a retainer 39 is fitted, and the stator iron core 33 is fixed to the housing 31. If the housing 31 is placed on the work table with the side to which the cover 32 of the housing 31 is attached facing up, the above work is facilitated. Further, the lead wire 35a is drawn out from a hole provided in the housing 31, and the hole is sealed. Further, the weir member 40 is placed so as to cover the lead wire 35 a side of the winding 35. FIG. 12 illustrates this state.

  Subsequently, the bearing 4 and the rotor 2 are fitted into the housing 31, and the cover 32 is fixed to the housing 31 with the bolts 37 after the bearing 5 is fitted into the rotor 2. The motor 1 shown in FIG. 1 is completed through the above steps.

  One advantage of the structure of the motor 1 described above is that a cooling oil flow path is formed simply by the bobbin members 34A and 34B around which the winding 35 is wound being sandwiched between the housing 31 and the cover 32. Specifically, in the motor of the present embodiment, the inner blade portion 52 of each bobbin member 34A is fitted into the housing 31, and the inner blade portion 55 of each bobbin member 34B is pressed against the cover 32 with the packing 38 interposed therebetween. Thereby, an annular space is formed by the housing 31, the cover 32, and the inner blade portions 52, 55 of the bobbin members 34A, 34B. That is, the cooling oil flow path is formed in an annular shape so that the cooling oil does not enter the inner blade portions 52 and 55. The structure in which the bobbin members 34A and 34B are also used for forming the flow path is preferable in that the flow path for the cooling oil can be formed with a small number of man-hours. Below, the flow path through which cooling oil flows in the motor 1 of the present embodiment will be described in detail.

  As shown in FIG. 1, the cooling oil is supplied to the supply port 31 a of the housing 31. The cooling oil supplied to the supply port 31a flows in the circumferential direction of the motor 1 through the flow path formed by the groove 36a of the nozzle ring 36 and the housing 31, as shown in FIG. 3A. Each of the 36 supply holes 36b is reached. The cooling oil that has reached the supply hole 36b flows in the radial direction of the motor 1 and is supplied to the supply hole 50 of the bobbin member 34A. As shown in FIG. 2, the cooling oil supplied to the supply hole 50 flows into the space around which the winding 35 is wound, and further flows in the axial direction of the motor 1 along the stator core 33. As a result, the winding 35 is directly cooled by the cooling oil. At this time, since the inner blade portions 52 and 55 of the bobbin members 34A and 34B, the housing 31 and the cover 32 form a dense liquid structure, the cooling oil does not enter the space where the rotor 2 rotates. Please keep in mind. Preventing cooling oil from entering the space in which the rotor 2 rotates is important for increasing the efficiency of the motor 1.

  The cooling oil that has flowed in the axial direction along the stator core 33 and has reached the cover 32 side of the winding 35 then flows in the circumferential direction of the motor 1, and the inner blades of the housing 31, the cover 32, and the bobbin members 34A and 34B. It reaches the lowermost part of the space surrounded by the parts 52 and 55. The cooling oil that has reached the bottom is discharged from the discharge port 31b. The cooling oil discharged from the discharge port 31b is cooled by an oil cooler (not shown), further pumped up by an oil pump (not shown), and returned to the supply port 31a of the housing 31.

  One thing to note about the cooling oil flow path described above is that the cooling oil is dispersed in the circumferential direction by the grooves 36a of the nozzle ring 36 and then injected into the supply holes 50 of the bobbin members 34A in the radial direction. That is. Such a structure is effective for shortening the axial length of the motor 1. In the structure in which the cooling oil is supplied in the axial direction as disclosed in JP-A-4-364343 and JP-A-2004-112856, the axial length of the motor 1 increases. In the present embodiment, since the cooling oil is injected in the radial direction, the axial length of the motor 1 can be shortened.

  One feature of the motor 1 of the present embodiment is that the flow of the cooling oil is controlled so that the cooling oil is efficiently supplied to the winding 35 by the winding cover 34C fitted into the bobbin member 34A. It is. As illustrated in FIG. 10, the winding cover 34 </ b> C covers the housing 31 side of the winding 35 at a position close to the supply hole 50, so that the cooling oil is separated from the winding 35 and into the housing 31. Prevent heading. Thereby, the coil | winding 35 becomes easy to get wet with cooling oil, and cooling efficiency improves. In addition, since the winding cover 34C is curved along the winding 35, the cooling oil flowing in from the supply hole 50 flows along the winding 35 (see the arrow in FIG. 10). This is also effective for improving the cooling efficiency. Thus, in this embodiment, the flow of the cooling oil is controlled by the winding cover 34C, and the cooling efficiency is improved. This is effective for improving the reliability of operation of the motor 1.

  In the motor 1 of the present embodiment, the flow of the cooling oil on the lead wire 35a side of the winding 35 is further controlled by the dam member 40, thereby effectively improving the cooling efficiency. When the cooling oil is removed from the gap between the windings 35 in the axial direction on the lead wire 35a side of the winding 35, the entire surface of the winding 35 is difficult to get wet by the cooling oil, and the cooling efficiency is lowered. The weir member 40 changes the flow of the cooling oil flowing in the axial direction to the circumferential direction, and thereby makes the entire winding 35 easily wetted by the cooling oil. This is effective for improving the cooling efficiency.

  Here, the fact that the weir member 40 is formed of an elastic material (an elastically deformable material) is important for controlling the flow of the cooling oil according to the complicated structure on the lead wire side of the winding 35. Please note that. On the lead-out side of the winding 35, the lead-out line 35a and the signal line are wired, so that a structure with irregular irregularities appears. Since the weir member 40 is made of an elastic material, the weir member 40 can be disposed along the lead wire side of the winding 35 even if it has an irregular structure. This is effective for improving the cooling efficiency.

  Note that in the motor 1 of the present embodiment, the weir member 40 is not an essential component for improving the cooling efficiency by the cooling oil. In the motor 1 of the present embodiment, it is possible that the winding cover 34C is used but the dam member 40 is not used.

  Moreover, although the embodiment in which the present invention is applied to a motor has been described above, it should be noted that the present invention can be applied to any rotating electric machine of a motor and a generator.

1: Motor 1a: Center shaft 2: Rotor 3: Stator 4, 5: Bearing 6: Arrow 21: Shaft 22: Retainer 23: Rotor core 24: Field magnet 31: Housing 31a: Supply port 31b: Discharge port 32: Cover 33: Stator iron core 33a: Peripheral part 33b: Stator teeth 33c: Space 34A, 34B: Bobbin member 34C: Winding cover 35: Winding 35a: Lead wire 36: Nozzle ring 36a: Groove 36b: Supply hole 37: Bolt 38a- 38c: Packing 39: Retainer 40: Weir member 40a: Base 40b: Side part 50: Supply hole 51, 54: Bobbin center 52, 55: Inner blade part 53, 56: Outer blade part 57, 59: Protrusion part 58, 60 : Step 61: Front part 62, 63: Side part

Claims (5)

A rotor,
A rotating electric machine comprising a stator,
The stator is
The stator core,
A bobbin provided on each of the stator cores;
A winding wound around each of the bobbins,
The bobbin includes first and second bobbin members mounted so as to sandwich the stator core in the axial direction of the rotating electrical machine,
The first bobbin member is
A first bobbin center disposed along a stator tooth of the stator core;
A first inner blade portion joined to the first bobbin center and facing the rotor;
A first outer blade portion joined to the first bobbin center at a radially outer position of the rotating electrical machine than the first inner blade portion;
The first outer blade portion has a supply hole that penetrates in the radial direction of the rotating electrical machine and communicates with the winding;
The stator is configured to supply a liquid refrigerant to the supply hole of the first outer blade portion,
A winding cover that covers a side of the winding opposite to the stator core is mounted between the first outer blade portion and the first inner blade portion on each first bobbin member of the bobbin,
The winding cover is mounted on the first bobbin member such that the supply hole of the first outer blade portion is located between the winding cover and the first bobbin center. The rotating electrical machine according to claim 1,
The rotating electrical machine, wherein the winding cover is curved along the winding. The rotating electrical machine according to claim 1 or 2,
The stator is
A housing for housing the stator core, the bobbin, and the winding;
A cover that covers the opening of the housing;
The second bobbin member is
A second bobbin center disposed along the stator teeth of the stator core;
A second inner blade portion joined to the second bobbin center and facing the rotor;
A second outer blade portion joined to the second bobbin center at a radially outer position of the rotating electrical machine than the second inner blade portion;
The housing, the cover, and the first and second inner blade portions form a space of an annular dense liquid structure that is configured so that the liquid refrigerant does not enter the first and second inner blade portions. The rotating electric machine. The rotating electrical machine according to claim 3,
Furthermore, it has a weir member formed of an elastic material,
The supply hole of the first outer blade portion of the first bobbin member is located closer to the housing than the stator core;
The lead wire of the winding is disposed closer to the cover than the stator iron core,
The dam member is arranged to cover the cover side of the winding. The rotating electrical machine according to claim 3,
Furthermore, it comprises a nozzle ring provided inside the housing,
The housing is provided with a supply port through which the liquid refrigerant is supplied,
The nozzle ring distributes the liquid refrigerant supplied from the supply port in a circumferential direction of the rotating electrical machine, and supplies the liquid refrigerant to the supply hole of the first bobbin member in the radial direction.

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