JP4928986B2 - Fully closed electric motor for vehicle drive - Google Patents

Description

  The present invention relates to a vehicle drive fully-closed electric motor for driving a railway vehicle.

  In general, in a railway vehicle such as a train, a drive motor is mounted in a carriage disposed under the floor of the vehicle body, and the rotational force of the motor is transmitted to wheels via a gear device to run the vehicle.

  Conventionally, such an electric motor for driving a vehicle has used an open self-ventilation type motor that cools the outside air by circulating it through the ventilation fan provided on the rotating shaft. However, in recent years, the application of a fully-closed electric motor that can be prevented from being disassembled for a long period of time without being polluted by outside air inflow has been studied.

  In the case of this fully-closed motor, the cooling performance is lower than that of an open self-ventilation type motor. Therefore, the motor becomes large in order to keep the motor temperature within the specified value, and it is difficult to store it in the carriage. There is a problem that becomes. Therefore, in order to employ a fully-closed electric motor for driving a vehicle, it is necessary to improve the cooling performance and reduce the size.

  As an example of a vehicle-drive fully-closed electric motor with improved cooling performance, a structure described in Japanese Patent Application Laid-Open No. 2006-25521 (Patent Document 1) is known. This conventional vehicle-driving fully-closed electric motor is as shown in FIGS. 10 and 11, and a cylindrical stator core 2 is fixed to the inner peripheral portion of the frame 1, and the inner peripheral portion of the stator core 2 is fixed. A groove is provided on the circumference, and the stator coil 3 is accommodated in the groove. A bearing bracket 4 incorporating a bearing 6 is attached to one end side of the frame 1, and a bearing bracket 5 incorporating a bearing 7 is attached to the other end side.

  A cylindrical rotor core 9 is disposed on the inner peripheral side of the stator core 2, and a rotor shaft 8 is attached to the center of the rotor core 9. Both end portions of the rotor shaft 8 are rotatably supported by bearings 6 and 7, respectively. Grooves are provided on the circumference of the outer peripheral portion of the rotor core 9, and the rotor bar 10 is accommodated in the grooves.

  The rotor iron core 9 is formed with a ventilation hole 9a penetrating in the axial direction. A cooling fan 11 is attached to the drive side surface (right side in FIG. 10) of the rotor core 9, and a cooling fan 12 is attached to the non-drive side surface (left side in FIG. 10).

  Between the outer peripheral part of the former cooling fan 11 and the inner peripheral part of the frame 1, a labyrinth 13 composed of a circumferential minute gap is formed. A labyrinth 14 is similarly formed between the outer periphery of the latter cooling fan 12 and the inner periphery of the frame 1. Further, blades 11 a and 11 b are formed on both wall surfaces of the cooling fan 11. A blade 12 a is formed on one wall surface of the cooling fan 12.

  An exhaust port 1 b is provided on the outer peripheral portion of the driving side surface of the frame 1, and an inlet port 4 a is provided on the wall surface of the driving side bearing bracket 4. Similarly, an exhaust port 1 c is provided on the outer peripheral portion of the side surface of the non-driving side of the frame 1, and an air inlet port 5 a is provided on the wall surface of the non-driving side bearing bracket 5. A large number of cooling fins 1 a are formed on the outer peripheral surface of the frame 1.

  The entire motor is mounted on the carriage by fixing mounting arms 1d and 1e provided on the outer periphery of the frame 1 to the carriage frame 100 with bolts 1f and 1g. 8a is directly connected to the drive gear device through a joint.

  In such a conventional fully-closed electric motor, during operation, the cooling fans 11 and 12 are rotated along with the rotation of the rotor shaft 8 so that the outside air is supplied from the inlets 4a and 5a by the fan action of the blades 11a and 12a. Outside air is circulated so as to be sucked into the side surface and exhausted from the exhaust ports 1b and 1c. In this way, by allowing the outside air to flow through the side surfaces of the cooling fans 11 and 12, the heat generated in the rotor and the heat of the heated internal air are released to the flowing outside air via the cooling fans 11 and 12. Further, the heat generated in the stator core 2 and the heat of the air inside the machine are also dissipated by the cooling fins 1 a provided on the outer periphery of the frame 1 to effectively cool the inside of the machine.

  As described above, the fully-driving electric motor for driving a vehicle with improved cooling performance is provided with a rotor having a structure in which a rotor bar 10 is provided on a rotor core 9. However, in recent years, an AC synchronous motor in which a permanent magnet is embedded in a rotor is advantageous in terms of energy saving and reduction in size and weight by improving efficiency. In the case of a fully closed electric motor in which the permanent magnet is embedded in the rotor, the allowable temperature for preventing the permanent magnet from deteriorating is lower than that of the rotor bar. Therefore, in the case of a fully closed permanent magnet synchronous motor, it is necessary to suppress the temperature rise of the rotor more than before, and it is necessary to improve the cooling of the rotor more than before. At the same time, in addition to the demand for labor-saving maintenance work by non-disassembly, there is also a great demand for noise reduction during operation from the viewpoint of environmental improvement.

The noise of the conventional fully-closed motor described above is dominated by the wind noise (fan noise) of the cooling fan. The conventional fully-closed motor having the structure shown in FIGS. Although the noise is lower than that of an electric motor, further noise reduction is required.
JP 2006-25521 A

  The present invention has been made in view of the above-described problems of the prior art. In a fully-closed permanent magnet motor, the cooling performance of the rotor can be improved and the temperature effect on the permanent magnet embedded in the rotor can be reduced. It is an object of the present invention to provide a vehicle drive fully-closed electric motor that can be reduced in size and at the same time can reduce noise during rotation.

The present invention includes a bearing bracket for supporting the rotor shaft through the inner circumferential side cylindrical stator core attached to a frame, mounted on both axial ends respectively of the frame, the built-in bearing, said stator core the inner circumferential side of, attached to the rotor shaft, a rotor core in which a permanent magnet is embedded near the outer periphery, is mounted in close contact with the axial end surfaces respectively of the front SL rotor core, and their outer circumferential surface with two heat radiating body forming a circumferential small gap between the frame, the outside air introduction space provided between the two heat radiator respective outer sides with the bearing bracket respective inner side surface , a surface in close contact with the two of the rotor core of the radiator, the diameter leading outside径近beside the rotor core, and the two radiator Cabin air, a wall surface in contact with the outside air, and wherein the totally enclosed type electric motor for driving a vehicle that is a shape having a plurality of uneven portions in the shape waving in a circumferential direction.

  According to the present invention, the heat generated in the rotor iron core can be efficiently transferred to the heat dissipating body provided in close contact with both sides of the rotor iron core, so that heat dissipation from the heat dissipating body to the outside air is easy. Thus, a high cooling performance can be obtained, the temperature effect on the permanent magnet can be reduced, and at the same time, the cooling performance of the entire motor can be improved, so that the size of the motor can be reduced.

  In addition, according to the present invention, the heat dissipating body attached to the end face of the rotor core is rotated together with the rotor core so that the heat of the rotor core is dissipated to the outside air by this heat dissipating body instead of the conventional cooling fan. Generation of loud noise such as wind noise caused by the blades of a conventional cooling fan can be suppressed, and noise can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) A fully-closed electric motor for driving a vehicle according to a first embodiment of the present invention will be described with reference to FIGS. A cylindrical stator core 2 is fixed to the inner peripheral portion of the frame 1, and the stator coil 3 is accommodated and fixed in each of a plurality of grooves formed on the inner peripheral surface of the stator core 2. A large number of cooling fins 1 a are formed on the outer peripheral surface of the frame 1. A bearing bracket 4 having a built-in bearing 6 is attached to one end of the frame 1 in the axial direction, that is, a drive side end (right end in FIG. 1). A bearing bracket 5 having a built-in bare link 7 is attached to an end portion on the opposite side of the frame 1 (left end portion in FIG. 1).

  A rotor iron core 9 is disposed on the inner peripheral side of the stator iron core 2, and a rotor shaft 8 is coupled to the center of the rotor iron core 9. Both end portions of the shaft of the rotor shaft 8 are supported by bearings 6 and 7. A plurality of permanent magnets 15 are embedded in the outer peripheral portion of the rotor core 9.

  A heat radiator 16 is attached to the drive side end of the rotor core 9, and a heat radiator 17 is also attached to the counter drive side end of the rotor core 9. On the circumference between the outer peripheral part of the radiator 16 and the inner peripheral part of the driving side end of the frame 1, a labyrinth 18 composed of a minute gap is formed. Similarly, a labyrinth 19 composed of a minute gap is also formed on the circumference between the outer peripheral portion of the heat radiating body 17 and the inner peripheral portion of the opposite end portion of the frame 1 on the driving side. The side surfaces of the radiators 16 and 17 on the side of the rotor core 9 are attached so that the outer diameter is enlarged to the vicinity of the outer diameter of the rotor core 9 and is in close contact with both side surfaces of the rotor core 9.

  A large number of machine-side concave portions 16a and machine-side concave portions 16b are formed on the circumference alternately on the wall surface of the radiator 16 so that the wall surface is corrugated. Similarly, on the wall surface of the heat dissipating body 17, a large number of machine-side concave portions and machine-side concave portions are alternately formed on the circumference to make the wall surface corrugated.

  A space is formed between the radiator 16 and the bearing bracket 4, and an inlet 4 a communicating with this space is formed at a position slightly outside the bearing 6 in the bearing bracket 4, and the driving side end of the frame 1 is formed. An exhaust port 1b communicating with this space is formed in the outer peripheral portion. Similarly, a space is also formed between the heat radiating body 17 and the bearing bracket 5, and an inlet 5 a communicating with this space is formed at a position slightly outside the bearing 7 in the bearing bracket 5. An exhaust port 1c communicating with this space is formed in the outer periphery of the non-driving side end.

  Next, the operation of the vehicle drive fully-closed motor configured as described above will be described. Since the magnetic irregularities are generated in the circumferential direction of the rotor core 9 by embedding the permanent magnet 15, the rotor core 9 is magnetically induced by energizing the stator coil 3 with an alternating current to generate a rotating magnetic field. Rotate. During this operation, heat generated from the electric motor is radiated from the outer peripheral surface of the frame 1 to the outside air. At this time, since a large number of cooling fins 1a are formed on the outer peripheral surface of the frame 1, the heat radiation area is wide, and the cooling fins 1a can efficiently release heat.

  The heat of the rotor core 9 is transmitted to the heat dissipating bodies 16 and 17 provided at both ends of the rotor core 9 and then released from the heat dissipating bodies 16 and 17 to the outside air introduced into the outside space of the heat dissipating body. . Here, since the heat dissipating bodies 16 and 17 have a diameter up to the vicinity of the outer diameter of the side surface of the rotor core 9 and are attached in close contact therewith, the heat of the rotor core 9 is efficiently transmitted to the heat dissipating bodies 16 and 17. The iron core 9 can be cooled efficiently.

  Further, the wall surface of the radiator 16 is formed by alternately forming a large number of outer concave portions 16a and inner concave portions 16b in the circumferential direction so that the wall surface is corrugated. Contact area increases, heat dissipation from the radiator to the outside air is promoted, and cooling performance is improved. Further, by increasing the contact area between the radiator 16 and the in-machine air, the cooling efficiency of the in-machine air can be improved and each part in the machine can be well cooled.

  Furthermore, since the wall surface of the heat radiating body 16 that contacts the outside air is wavy in the circumferential direction, when the heat radiating body 16 rotates together with the rotor core 9, the outside air is pushed out in the outer circumferential direction by the fan action of the heat radiating body 16. Cooling outside air can always be caused to flow into the space from the inlet 4a formed in the center of the bearing bracket 4, the space portion can be pushed out in the outer peripheral direction, and discharged from the exhaust port 1b. In this way, the cooling action of the heat radiating body 16 is further improved by allowing the cooling outside air to constantly flow on the surface of the heat radiating body 16.

  In addition, the cooling action of the cooling air due to the rotation of the heat radiating body 16 is caused by the fan action of the undulating smooth uneven surface, so that noise is generated compared to the wind noise generated by the rotation of the blade of the cooling fan having the conventional structure. There is also an advantage that can be reduced.

  Similarly, with respect to the radiator 17, a large number of machine-inside concave parts and machine-inside concave parts are alternately formed in the circumferential direction, and this wall surface is corrugated. The contact area increases, heat dissipation from the radiator to the outside air is promoted, and the cooling performance is improved.

  Further, since the wall surface of the heat radiating body 17 that contacts the outside air is wavy in the circumferential direction, when the heat radiating body 17 rotates, it is pushed out by the fan action in the outer circumferential direction, so that the cooled outside air is always directed to the center of the bearing bracket 5. It is possible to flow into the space from the formed air inlet 5a, push the space portion in the outer circumferential direction, and exhaust the air from the exhaust port 1c. This improves the cooling performance of the rotor core 9 and the in-machine air. Further, similarly to the heat radiating body 16, the heat radiating body 17 can also reduce the generation of noise because the cooling air is blown by the rotation of the fan 17 having a smooth undulating surface.

  Thus, according to the vehicle drive fully-closed electric motor of the present embodiment, the rotor core 9 can be effectively cooled, and in particular, the outer peripheral portion of the rotor core 9 in which the permanent magnets 15 are embedded is improved. The temperature can be cooled and the temperature increase of the permanent magnet 15 can be suppressed, the deterioration thereof can be suppressed, the noise generated during operation can be reduced, and the noise can be reduced.

  (Second Embodiment) A fully-closed motor for driving a vehicle according to a second embodiment of the present invention will be described with reference to FIGS. The feature of the present embodiment is in the rotor portion, and the features shown in FIGS. 3 and 4 are provided. Note that components common to the first embodiment will be described using common reference numerals.

  In the present embodiment, a plurality of fins 20 a are provided on the wall surface outside the machine of the radiator 20 attached to the drive side surface of the rotor core 9, and a plurality of fins 20 b are also provided on the wall inside the machine of the radiator 20. Yes. These fins 20a and 20b have a shape extending in the rotation direction. In addition, the thing provided with the fin similarly can be employ | adopted also about the heat sink of the counter drive side side surface of the rotor iron core 9. FIG.

  In the case of the fully-closed motor for driving a vehicle according to the present embodiment, by providing a large number of fins 20a on the outer wall surface of the radiator 20, the heat radiation area from the radiator 20 to the outside air can be further increased, and the heat radiation. Performance can be increased. Further, by providing a large number of fins 20b on the inner wall surface of the radiator 20, the heat of the in-machine air can be easily transmitted by the radiator 20, and as a result, the in-machine air can be cooled more effectively. Become. As a result, according to the present embodiment, the rotor core 9 can be cooled more effectively, and the cooling effect of each part in the machine can be enhanced by the effective cooling of the machine air. In addition, by making the fins 20a and 20b provided in the radiator 20 into a shape extending in the rotation direction, wind noise during rotation of the radiator 20 can be reduced, generation of noise can be suppressed, and noise during operation can be reduced. it can.

  (Third Embodiment) A fully-closed electric motor for driving a vehicle according to a third embodiment of the present invention will be described with reference to FIG. The feature of the present embodiment resides in the rotor portion and has the feature shown in FIG. Note that components common to the first embodiment will be described using common reference numerals. 5 is the same as that of the second embodiment and is shown in FIG.

  In the present embodiment, the first heat radiation divided body 21 is attached in close contact with the rotor iron core 9, the second heat radiation divided body 22 is attached in close contact with the first heat radiation divided body 21, and the first Both the heat radiation divided body 21 and the second heat radiation divided body 22 are integrated with a bolt 23.

  As in the second embodiment, a plurality of fins 22a are provided on the wall surface outside the machine of the second heat radiation divided body 22, and a plurality of fins 22b are also provided on the wall surface inside the machine of the second heat radiation divided body 22. Provided. These fins 22a and 22b have a shape extending in the rotation direction. Note that the heat dissipating body on the side opposite to the driving side of the rotor core 9 can also have a similar structure, and a second heat dissipating divided body provided with fins can be employed.

  In the case of the fully-closed electric motor for driving the vehicle according to the present embodiment, in addition to the same operations and effects as those of the second embodiment, the heat radiator having a complicated shape and structure is manufactured as a divided structure. There is an advantage that becomes easier.

  In the present embodiment, the first heat dissipating divided body 21 and the second heat dissipating divided body 22 having a divided structure can be manufactured using different materials. For example, the second heat radiation divided body 22 is made of an aluminum alloy casting which is a relatively flexible metal material, so that a complicated shape can be easily manufactured, and the heat radiation characteristics can be further improved. Furthermore, although the heat dissipating body has a divided structure, the divided shape is not limited to the illustrated one. And it is possible to set it as the division body more than 3 divisions.

  (Fourth Embodiment) A vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention will be described with reference to FIGS. Elements common to the first embodiment shown in FIGS. 1 and 2 will be described using common reference numerals.

  The feature of this embodiment is that a ventilation hole 9a is formed in the rotor iron core 9 to enable circulating cooling of the in-machine air. That is, as shown in FIGS. 6 to 8, the permanent magnet 15 is embedded in the outer peripheral portion of the rotor core 9, and the ventilation holes 9 a penetrating in the axial direction in the inner peripheral portion of the rotor core 9 are separated by 60 degrees at a rotation angle. It is formed at a plurality of locations. A radiator 24 is attached to the drive side end of the rotor core 9, and a radiator 25 is attached to the non-drive side end.

  As shown in detail in FIGS. 6 and 7, the radiator 24 is formed with blow-up ducts 24 a extending in the radial direction at three locations separated in the rotation direction by equal rotation angle pitches. The axial end portion of the blow-up duct 24a communicates with the ventilation hole 9a of the rotor core 9 through the communication hole 24b, and the outer diameter-side end portion of the blow-up duct 24a is opened to the in-machine space. An intermediate portion between adjacent blow-up ducts 24a in the radiator 24 is open to a wide range in the machine space, and a bottom space of the intermediate portion is also communicated with the ventilation hole 9a of the rotor core 9 through the communication hole 24c. is there.

  As shown in detail in FIGS. 6 and 8, the same applies to the radiator 25 on the opposite side, and a blowing duct 25a extending in the radial direction is formed at each of three locations separated in the rotational direction by equal rotational angle pitches. The blowing duct 25a and the above-described opposite blowing duct 24a are set in a positional relationship shifted by 60 degrees in the rotation direction. The axial end portion of the blowing duct 25a communicates with the ventilation hole 9a of the rotor core 9 through the communication hole 25b, and the outer diameter side end portion of the blowing duct 25a is opened to the interior space. An intermediate portion between adjacent blow-up ducts 25a in the radiator 25 is opened to a wide range in the machine space, and a bottom space of the intermediate portion is also communicated with the ventilation hole 9a of the rotor iron core 9 through the communication hole 25c. is there.

  Each of the radiators 24 and 25 has a structure in which the outer wall surface is corrugated like the first embodiment to improve the heat dissipation performance by the outside air. The outer wall surface of each of the radiators 24 and 25 can have a structure in which heat radiating fins are provided as in the second embodiment, or can have a divided structure as in the third embodiment. .

  In the vehicle drive fully-closed electric motor of the present embodiment, when the rotor rotates, the in-machine air in the blow-up duct 24a of the drive-side radiator 24 is blown to the outer peripheral side, and circulates in the drive-side machine space as indicated by arrows. After that, the air flows into the ventilation hole 9a of the rotor core 9 from the communication hole 24c, and further flows into the blow-up duct 25a through the communication hole 9a through the communication hole 25b of the counter driving side radiator 25. Then, the in-machine air that has flowed into the blow-up duct 25a is blown up to the outer peripheral side, circulates through the counter-drive-side in-machine space, and then flows into the ventilation hole 9a of the rotor core 9 from the communication hole 25c. It passes through the communication hole 24b of the drive side radiator 24 and re-flows into the duct 24a. Thus, the air in the machine circulates and circulates through the ventilation hole 9 a of the rotor core 9 through the air space inside the driving side and the space inside the driving side due to the fan action of the radiators 24 and 25 due to the rotation of the rotor. Since this circulating in-machine air is cooled when it flows through the radiators 24, 25, each part of the in-machine such as the rotor core 9, the permanent magnet 15, the stator coil 3, and the stator core 2 is circulated by circulating in the interior space. It can be cooled effectively.

  According to the present embodiment, the heat of the rotor core 9 is transferred to the radiators 24 and 25 and then dissipated to the outside air, and the rotor core 9 is also cooled by the circulating air flowing through the ventilation holes 9a. To be cooled. Further, since the in-machine air is circulated and circulated by the radiators 24 and 25 that are effectively cooled, the cooling performance of the entire motor is also improved.

  (Fifth Embodiment) A vehicle drive fully-closed electric motor according to a fifth embodiment of the present invention will be described with reference to FIG. Elements common to the first embodiment shown in FIGS. 1 and 2 will be described using common reference numerals.

  As in the fourth embodiment, the feature of this embodiment is that a ventilation hole 9a is formed in the rotor iron core 9 to enable circulating cooling of the in-machine air. However, unlike the fourth embodiment, the air flow between the drive-side device internal space and the non-drive-side internal device space uses an air gap between the rotor core 9 and the rotor / stator. Is different.

  That is, as shown in FIG. 9, permanent magnets 15 are embedded in the outer peripheral portion of the rotor core 9, and ventilation holes 9 a penetrating in the axial direction are formed in the inner peripheral portion of the rotor core 9 at a plurality of locations. A heat radiator 26 is attached to the drive side end of the rotor core 9, and a heat radiator 27 is attached to the counter drive side end.

  The radiator 26 at the drive side end of the rotor core 9 is formed with a blow-up duct 26a extending in the radial direction at each of a plurality of locations separated in the rotation direction by equal rotation angle pitches. The axial end of each blowing duct 26a communicates with each ventilation hole 9a of the rotor core 9 through the communication hole 26b, and the outer diameter side end of the blowing duct 26a is opened to the in-machine space.

  A blow-up duct is not formed in the heat dissipating body 27 at the end of the rotor core 9 on the non-driving side. A machine-side concave portion 27a that communicates widely with the space inside the machine is formed in the machine-inside portion of the heat dissipating body 27, and the rotor core 9 passes through the position of the axial side end of the machine-side concave portion 27a. A communication hole 27b that communicates with each of the air holes 9a is formed.

  In the vehicle drive fully-closed electric motor according to the present embodiment, due to the rotation of the rotor, the air in the machine is blown into the drive-side machine space by the fan action of the blow-up duct 26a of the drive-side radiator 26 as indicated by the arrow. Later, it flows through a circular air gap space between the stator iron core 2 and the rotor iron core 9 and flows into the non-driving side in-machine space. Thereafter, the in-machine concave portion 27a and the communication hole 27b of the non-driving side radiator 27 are provided. Then, it flows into the ventilation hole 9a of the rotor iron core 9, circulates and circulates in the machine so as to return to the blow-up duct 26a of the drive side radiator 26 from the communication hole 26b through the ventilation hole 9a.

  According to the present embodiment, as described above, since the in-machine air circulates and circulates in the in-machine space, the rotor core is cooled by the cooled in-machine air to be cooled when circulating through the portions of the radiators 26 and 27. 9 and each part in the machine can be effectively cooled, and the permanent magnet embedded in the cooled machine air in order to circulate through the outer peripheral part of the rotor core 9 and cool the outer peripheral part of the rotor core 9 15 can be effectively cooled, and the temperature rise of the permanent magnet 15 can be well suppressed.

1 is a cross-sectional view of a vehicle drive fully-closed electric motor according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along line AA in FIG. 1. Sectional drawing of the drive side heat radiator and rotor iron core in the fully-closed motor for a vehicle drive of the 2nd Embodiment of this invention. BB sectional drawing in FIG. Sectional drawing of the drive side heat radiator and rotor iron core in the fully-closed motor for a vehicle drive of the 3rd Embodiment of this invention. Sectional drawing of the fully closed type motor for a vehicle drive of the 4th Embodiment of this invention. CC sectional view taken on the line in FIG. The DD sectional view taken on the line in FIG. Sectional drawing of the fully closed type motor for a vehicle drive of the 5th Embodiment of this invention. Sectional drawing of the conventional fully enclosed electric motor for a vehicle drive. The front view of the conventional fully enclosed electric motor for vehicle drive.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1a Radiation fin 2 Stator iron core 3 Stator coil 4 Bearing bracket 5 Bearing bracket 8 Rotor shaft 9 Rotor iron core 9a Through-hole 15 Permanent magnet 16 Heat radiation body 16a Machine outer side concave part 16b Machine inner side concave part 17 Radiator 20 Heat radiator 20a, 20b Fins 21 Heat radiation divided bodies 22 Heat radiation divided bodies 22a, 22b Fins 23 Bolts 24 Heat radiation bodies 24a Blowing ducts 24b, 24c Flow holes 25 Heat radiation bodies 25a Blowing ducts 25b, 25c Flow holes 26 Heat radiation bodies 26a Blowing ducts 26b Flow holes 27 Heat radiators 27a Machine-side concave part 27b Distribution hole

Claims (5)

A cylindrical stator core attached to an inner peripheral side of the frame,
Attached to both axial ends respectively of the frame, and a bearing bracket for supporting the rotor shaft via a built-in bearing,
In the inner peripheral side of the stator core, mounted on the rotor shaft, a rotor core in which a permanent magnet is embedded near the outer periphery,
Mounted in close contact with each axial end surfaces of the front SL rotor core, with two heat radiating body forming a circumferential small gap between the frame and those of the outer peripheral surface,
An outside air introduction space is provided between the outer side surface of each of the two radiators and the inner side surface of each of the bearing brackets,
The surface of the two heat dissipators that are in close contact with the rotor core is a diameter that reaches the vicinity of the outer diameter of the rotor iron core , and the wall surface that is in contact with the air and outside air of the two heat dissipators is corrugated in the circumferential direction. A fully-closed electric motor for driving a vehicle characterized by having a shape having a plurality of uneven portions . 2. The vehicle-driving fully-closed electric motor according to claim 1, wherein a plurality of fins are formed on either one or both of an inner space side and an outer side of the wall surfaces of the two radiators. A plurality of axial holes penetrating in the axial direction are provided on the inner peripheral side of the rotor core, and one or both of the two radiators communicate with the ventilation hole and extend in the radial direction. 2. The vehicle-driving fully-closed electric motor according to claim 1 , wherein an air blowing duct is formed, and the in-machine air is circulated and circulated through the ventilation holes of the rotor core during rotation . The fully-closed electric motor for driving a vehicle according to claim 1 or 2 , wherein the two radiators are formed of a plurality of members . Totally enclosed type electric motor for driving a vehicle according to claim 1 or claim 2, characterized in that is constituted by a plurality of members made of different materials the two heat radiator.

Images