JP2006180684A - Fully enclosed electric motor for vehicle drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fully-closed electric motor for driving a vehicle capable of improving the cooling performance, enabling a reduction in size and weight and an increase in output, and improving the cooling performance of a bearing on the exhaust side.
An annular cooling air passage is provided on the inner surface of the bearing support member on the non-driving side of the motor, and an auxiliary fan is provided at the end of the rotor shaft on the outer side of the bearing support member. One end communicates with the outer peripheral space of the auxiliary fan at one or more external airflow inlets, and the other end of the cooling air passage communicates with the external space at one or more external airflow outlets.
[Selection] Figure 1

Description

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

  In general, a motor for driving a vehicle has a self-ventilation cooling structure that cools a heat generating portion in the machine by circulating cooling outside air through the machine of the motor for driving the vehicle by rotation of the ventilation fan fixed to the rotor shaft during operation. (For example, refer to Patent Document 1).

  Since the vehicle drive motor is loaded on a carriage disposed below the vehicle body, the outside air around the vehicle drive motor contains a lot of dust, water droplets, and the like that are rolled up during travel. Therefore, the outside air taken into the vehicle drive motor is designed to remove dust and the like as much as possible with a ventilation filter provided at the intake. However, during long-term operation, dust accumulates gradually in the machine, causing problems such as reduced cooling performance and reduced life of the insulation. Therefore, it was necessary to periodically disassemble the motor and clean the inside. .

  Therefore, development of a fully-closed vehicle drive motor is underway.

15 is a cross-sectional view showing an example of a fully-driving electric motor for driving a vehicle, and FIG. 16 is a cross-sectional view taken along line AA of FIG.

  As shown in FIGS. 15 and 16, a housing in which a bearing bracket 13 incorporating a bearing 12 is provided at one end (drive side) of the stator frame 11 and a bearing 14 is incorporated at the other end (counter drive side). 15 is provided. The rotor shaft 16 is supported by the bearings 12 and 14. A rotor core 17 is fixed to the central portion of the rotor shaft 16, and the rotor bar 18 is accommodated in a plurality of grooves provided on the outer diameter side of the rotor core 17. A cylindrical stator iron core 19 is fixed to the inner peripheral surface of the stator frame 11, and the stator coil 20 is housed in a plurality of grooves provided on the inner diameter side of the stator iron core 19.

  A ventilation fan 21 is attached to the non-driving side of the rotor shaft 16, a cover 22 is provided on the outer peripheral portion of the stator frame 11 to form a cooling air passage 23, and one end of the cooling air passage 23 is passed through the outer peripheral portion of the ventilation fan 21. The other end is open to the outer peripheral space of the driving side stator frame 11 and communicates with the space.

  A plurality of cooling fins 24 are provided on the outer peripheral surface of the stator frame 11 in the cooling air passage 23. In the electric motor, a support arm 25 provided on the stator frame 11 is fixedly supported on a bogie frame 26 by bolts, and one end 16a of the rotor shaft 16 is projected outside the machine, and this portion is driven by a gear provided on the axle 26 through a joint. It is directly connected to the device. During operation, the rotational force of the electric motor is transmitted from the rotor shaft 16 a to the axle 26 via the gear drive device, and the wheels 27 are rotated to cause the vehicle to travel along the rails 28. During operation of the electric motor, the cooling outside air is circulated to the cooling air passage 23 by the rotation of the ventilation fan 21, and the heat generated in the electric motor is discharged to the outside air from the cooling fins 24, thereby cooling the electric motor and increasing the temperature of the electric motor. The allowable limit is not exceeded.

Thus, since the conventional vehicle-drive fully-closed motor is fully closed, outside air does not circulate in the machine, so the inside of the machine is not polluted, and the disassembly cycle for disassembly and inspection due to dirt can be extended. It becomes possible.
JP-A-11-356005

  However, if the fully closed type is used, the cooling performance is lowered because the cooling is indirectly performed. Since the cooling by the outside air of the electric motor is performed on the outer peripheral surface of the stator frame 11, the cooling efficiency is not sufficient, and the temperature of the stator coil 20 and the rotor bar 18 may rise to exceed the allowable value due to heat accumulation inside. Therefore, it is necessary to increase the size of the stator coil 11 and the rotor bar 18 to suppress heat generation, which increases the size (increases in size and weight) of the electric motor.

  Since the vehicle driving motor is mounted in a limited space of the bogie frame 26, it cannot be mounted when the motor becomes larger. In order to improve the cooling performance, it is conceivable to increase the size of the ventilation fan 21 to increase the amount of cooling air, but the noise of the ventilation fan 21 increases and it cannot be used for a vehicle.

  Moreover, since the cooling of the bearing 12 on the exhaust side is not performed, the temperature rise of the bearing 12 increases. That is, the temperature of the outside air flowing through the outer peripheral surface of the stator frame 11 due to the rotation of the ventilation fan 21 gradually increases due to the heat absorbed as it flows through the cooling air passage 23, and the cooling performance decreases. For this reason, the temperature rise is increased in each part of the motor on the exhaust side (non-fan side). The temperature of the bearing 12 on the driving side (the anti-fan side) is easily raised because the outside air is not circulated by the ventilation fan 21, and the bearing bracket 13 on the driving side is on the exhaust air side of the cooling circulation outside air. The temperature of the portion of the drive side bearing 12 further rises due to the decrease in performance.

  The bearing 12 is lubricated with grease filled around the bearing 12. However, as the temperature rise of the bearing 12 increases, thermal deterioration of the lubricating grease progresses and the lubrication life is shortened. Therefore, the disassembly cycle for the overhaul of the electric motor is accelerated.

  An object of the present invention is to provide a vehicle-driving fully-closed electric motor that can improve cooling performance, reduce the size and weight, increase output, and improve the cooling performance of a bearing on the exhaust side.

  A fully-closed electric motor for driving a vehicle according to the present invention is provided with a cylindrical stator core on the inner peripheral side of a longitudinally central portion of a substantially cylindrical stator member, and a plurality of stator coils are provided on the inner peripheral portion of the stator core. A bearing support member provided with bearings that support both ends of the rotor shaft on the driving side and the non-driving side of the rotor shaft having the rotor core, and provided with a rotor core at the center of the rotor shaft, On the driving side, a ventilation fan is provided on the rotor shaft at a position on the inner side of the bearing support member, and a circumferential minute gap is provided between the outer peripheral portion of the ventilation fan and the inner peripheral portion of the stator member. Forming a plurality of outside air blowing blades arranged radially on the outside wall of the ventilation fan, and providing a plurality of inside air circulation blades arranged radially on the inside wall of the ventilation fan, the drive side A plurality of outside air intakes are provided on the side surface of the bearing support member, a plurality of exhaust ports are provided at the outer peripheral position of the outside air blowing blade of the ventilation fan in the stator member on the driving side, An annular cooling air passage is provided on the machine inner side surface of the bearing support member, an auxiliary fan is provided at an end of the rotor shaft outside the machine of the bearing support member, and one end in the cooling air passage is an outer peripheral portion of the auxiliary fan. The space communicates with one or a plurality of external airflow inlets, and the other end of the cooling air passage communicates with the space outside the machine at one or a plurality of external airflow outlets.

  According to the present invention, the outside air is circulated on the surface of the driving side stator member by the outside air blowing blade provided on the outside of the driving side ventilation fan and cooled, and the inside air is cooled by the inside air circulation blade provided on the inside of the machine. The heat of the internal unit is circulated to the outside and released to the outside air outside the unit through the ventilation fan, so that the cooling performance is improved and the auxiliary fan on the non-driving side is used to cool the outside air to the inner side surface of the stator member of the non-driving side bearing. Since the inside of the provided annular cooling air passage is circulated, the cooling of the non-driving side bearing portion and the inside air circulating and circulating inside the non-driving side machine can also be cooled. Therefore, it is possible to improve the cooling performance of the entire motor to reduce the size and weight of the motor or increase the capacity (output increase), to reduce the temperature rise of the bearings on both sides and to extend the lubrication life of the lubricating grease, Disassembly cycle for electric motor inspection and repair can be extended.

(First embodiment)
FIG. 1 is a cross-sectional view of a fully-closed electric motor for driving a vehicle according to the first embodiment of the present invention, and FIG. 2 is a partially cutaway cross-sectional view taken along line BB in FIG. The same elements as those of the conventional example shown in FIGS. 15 and 16 are denoted by the same reference numerals, and redundant description is omitted.

  1 and 2, a substantially cylindrical stator member is provided on the outer peripheral portion of the stator iron core 19. The stator member includes a stator frame 11, and a drive side frame 29 and a counter drive side frame 30 on both sides of the stator frame 11. The stator frame 11, the drive side frame 29, and the counter drive side frame 30 which are the stator members. Thus, the cylindrical stator core 19 is positioned on the inner peripheral side of the central portion in the longitudinal direction. And the bearing support member provided with the bearings 12 and 14 is provided in the both ends of a stator member. That is, the bearing bracket 13 as a bearing support member provided with the bearing 12 is attached to the driving side frame 29, and the housing 15 as the bearing support member provided with the bearing 14 is attached to the non-driving side frame 30. A rotor shaft 16 is supported by the bearing 12 and the bearing 14, and a rotor core 17 is provided at the center of the rotor shaft 16. The rotor core 17 is provided with a plurality of ventilation holes 31 penetrating in the axial direction.

  On the drive side of the vehicle drive fully-closed electric motor, a ventilation fan 32 is provided on the rotor shaft 16 located on the inner side of the machine from the bearing 12 on the drive side, and the outer periphery of the ventilation fan 32 faces the drive side frame 29. Thus, a minute gap portion (labyrinth portion) 33 on the circumference is formed. This part divides the outside space from the inside space. A plurality of outside air blowing blades 34 are provided radially on the wall surface outside the ventilation fan 32 and a plurality of inside air circulation blades 35 are arranged radially on the wall surface inside the machine. An outside air intake port 36 is provided on the wall surface of the bearing bracket 13, and a circumferential exhaust port 37 is provided at the outer peripheral portion position of the outside air blowing blade 34 of the ventilation fan 32 of the driving side frame 29.

  On the other hand, on the non-driving side of the vehicle drive fully-closed electric motor, an auxiliary fan 38 is provided at the end of the rotor shaft 16 at a position on the outer side of the bearing 14 on the non-driving side so as to cover the outer periphery of the auxiliary fan 38. A cover 39 is provided, and an inner peripheral portion of the cover 39 serves as an outside air intake 40. An annular cooling air passage 42 covered with a cover 41 is provided on the inner side surface of the housing 15, and the cooling air passage 42 has one end (upper portion) formed by an external air flow inlet 43 and an outer periphery of the auxiliary fan 38 in the cover 39. An end (lower part) communicating with the side space is communicated with the outside space by the external airflow outlet 44. A plurality of cooling fins 45 are provided radially on the inner surface of the cover 41 forming the cooling air passage 42.

  According to such a structure, the cooling outside air flows from the outside air intake port 36 provided in the bearing bracket 13 by the rotation of the driving side ventilation fan 32 during operation, and is blown to the outer peripheral side by the outside air blowing blade 34, The air is exhausted from the 29 exhaust ports 37 to the outside of the machine. At the same time, the inside air is blown to the outer peripheral side by the rotation of the inside air circulating blade 35, and then flows to the non-driving side space through the gap between the stator iron core 19 and the rotor iron core 17. Circulate and circulate on the route back to the circumference.

  The internal heat generated by the operation is transmitted to the ventilation fan 32 by the circulating internal air and is released to the cooling outside air flowing through the outside wall surface of the ventilation fan 32 and the outside air blowing blade 34. Therefore, the circulating air is cooled, and each part in the machine is cooled to suppress the temperature rise. Further, since the cooled outside air blown up to the outer peripheral side by the outside air blowing blade 34 is discharged through a plurality of exhaust ports 37 provided, the drive side frame 29 is cooled, and the cooling of the entire motor is further improved. If the exhaust port 37 is configured in a rib shape, the cooling surface area increases due to the cooling fin effect, and the cooling performance is further improved. Further, since the cooling outside air also flows inside the machine of the bearing bracket 13, the cooling performance of the bearing 12 is improved and the temperature rise of the bearing is reduced.

  On the other hand, the cooling external air enters from the external air intake port 40 by the rotation of the auxiliary fan 38 on the non-driving side, flows into the cooling air passage 23 from the external air inlet 43 and flows through the cooling air passage 23, and then from the external air outlet 44. It flows out of the plane. The housing 15 and the bearing 14 are cooled by the circulating outside air, and the temperature rise of the bearing 14 is reduced. Furthermore, since the heat of the circulating air is released to the outside air flowing through the cooling air passage by the plurality of cooling fins 45 provided on the surface of the cooling air passage 23, the cooling performance inside the device is further improved. To do.

  According to the first embodiment, the cooling performance of the fully-closed electric motor for driving the vehicle is improved, so that the size and weight can be increased or the capacity can be increased, and the temperature rise of the bearing portions on both sides can be reduced. Elongation and decomposition period can be lengthened.

(Second Embodiment)
FIG. 3 is a sectional view of a vehicle drive fully-closed electric motor according to the second embodiment of the present invention, and FIG. 4 is a side view of FIG. This second embodiment is different from the first embodiment shown in FIG. 1 in that one or a plurality of circulation air passages 47 extending in the longitudinal direction are provided on the outer peripheral portion of the stator core 19, One end of the road 47 communicates with the drive-side space through the communication port 48 provided in the stator member, and the other end of the circulation air passage 47 communicates with the non-drive side through the communication port 49 provided in the stator member. It communicates with the cabin space. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 3 and 4, a cover 46 is provided on the outer peripheral side of the stator iron core 19 to form a circulation air passage 47 extending in the longitudinal direction. One end of the circulating air passage 47 communicates with the driving-side cabin space through a communication port 48 provided in the driving-side frame 29. On the other hand, the other end of the circulation air passage 47 communicates with the interior space on the counter-drive side via a communication port 49 provided in the counter-drive side frame 30. The circulating air passage 47 is provided at a plurality of locations on the outer periphery of the stator core 19. A plurality of cooling fins 50 are arranged on the outer wall surface of the cover 46 in the same direction as the traveling direction of the vehicle, and a plurality of cooling fins 51 are provided on the inner wall surface along the longitudinal direction of the electric motor. . The cooling fins 50 and 51 may be provided on either one.

  According to the second embodiment, since the circulation air passage area of the inside air is increased by the circulation air passage 47, the circulation ventilation amount of the inside air due to the rotation of the outside air blowing blade 34 of the ventilation fan 32 is increased and the cooling performance is improved. be able to. Furthermore, when the inside air flows through the circulation air passage 47, the heat of the inside air is transmitted to the cooling fins 51, and is further released by the cooling fins 50 into the traveling wind during vehicle operation, so that the circulation inside air is further cooled and the motor is cooled. The nature is further improved.

(Third embodiment)
FIG. 5 is a sectional view of a fully-closed electric motor for driving a vehicle according to the third embodiment of the present invention. In contrast to the first embodiment shown in FIG. 1, a cooling air passage 52 extending in the longitudinal direction is provided on the outer peripheral portion of the electric motor body, and a plurality of cooling fins 55 are provided on the inner wall surface and the outer wall surface of the cooling air passage 52. 56, one end of the cooling air passage 52 communicates with the inner space of the driving side machine through an outlet 53 provided in the stator member on the driving side, and the other end of the cooling air passage 52 is fixed on the non-driving side. It communicates with the in-machine space on the counter-drive side via an inlet 54 provided in the child member. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 5, a cooling air passage 52 extending in the longitudinal direction is provided outside the motor main body, and one end of the cooling air passage 52 communicates with the driving-side internal space via an outlet 53 provided in the driving-side frame 29. On the other hand, the other end of the cooling air passage 52 is communicated with the in-machine space on the non-driving side via an inlet 54 provided in the non-driving side frame 30. A plurality of cooling fins 55 are provided on the inner wall surface of the cooling air passage 52 along the longitudinal direction, and a plurality of cooling fins 56 are arranged on the outer wall surface in a direction (vehicle traveling direction) perpendicular to the longitudinal direction. . The cooling air passage 52 and the cooling fins 55 and 56 are made of an aluminum material having excellent heat conduction.

  According to the third embodiment, since the circulating internal air flows through the cooling air passage 52, the heat of the internal air is efficiently transmitted to the cooling fins 55 and is efficiently discharged from the cooling fins 56 to the outside air (running wind). Coolability is further improved.

(Fourth embodiment)
FIG. 6 is a partial cross-sectional view on the drive side of a vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment shown in FIG. 1 in that a cover 57 is provided on the outer periphery of the stator member on the driving side, and an external airflow passage 58 is provided between the cover member and the stator member. The outer airflow passage 58 is communicated with the exhaust port 37 provided in the stator member, and the outer airflow passage 58 is opened to the outside in the longitudinal direction. A plurality of cooling fins 59, 60 are provided on the wall surface and the outer wall surface. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 6, a cover 57 is provided on the outer peripheral side of the drive side frame 29, and an external air flow passage 58 is formed between the drive side frame 29 and one end of the external air flow passage 58 is passed through the external air blowing blade 34 of the wind fan 32. The other end side communicates with the outer peripheral space and is open to the atmosphere. A plurality of cooling fins 59 are provided radially and longitudinally on the outer wall of the drive side frame 29, and a plurality of cooling fins 60 are similarly provided on the inner wall of the drive side frame 29. In the above description, the case where the cover 57 is provided to form the external airflow passage 58 with respect to the first embodiment has been described. However, the second embodiment and the third embodiment are also described. The same applies.

  According to the fourth embodiment, the cooled outside air blown up to the outer peripheral side by the ventilation fan 32 circulates along the outer wall of the drive side frame 29 through the outer airflow passage 58, so that the heat of the inside air is cooled by the cooling fins 60. The air is efficiently discharged to the circulation air through the fins 59, and the inside air and the frame are cooled to improve the cooling performance.

(Fifth embodiment)
FIG. 7 is a cross-sectional view of a vehicle drive fully-closed electric motor according to a fifth embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along the line CC of FIG. This fifth embodiment is different from the first embodiment shown in FIG. 1 in that a plurality of ventilation holes 61 penetrating in the longitudinal direction are provided in the outer peripheral portion of the stator core 19, and a frame is provided on the drive side. 62 is provided with an outside air entry path 63 that communicates the outer space of the outside air blowing blade 34 of the ventilation fan 32 and one end of the ventilation hole 61 of the outer periphery of the stator core 19. An outside air discharge port 64 that opens the end to the outside of the machine is provided. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  7 and 8, a plurality of ventilation holes 61 penetrating in the longitudinal direction are provided in the outer peripheral portion of the stator iron core 19, and an outside air entry path 63 is formed between the frame 62 and the drive side frame 29. The cooled outside air blown up by the ventilation fan 32 flows from the outside air entry path 63 to the ventilation hole 61. Thereafter, the air is exhausted from the outside air outlet 64 provided in the non-driving side frame 30 to the atmosphere.

  According to the fifth embodiment, the cooled outside air blown by the outside air blowing blade 34 of the ventilation fan 32 circulates through the plurality of ventilation holes 61 of the stator iron core 19 through the outside air entry path 63 of the frame 62. 62 and the stator iron core 19 are well cooled, and the heat generated inside can be cooled in this portion.

(Sixth embodiment)
FIG. 9 is a sectional view of a fully-driving electric motor for driving a vehicle according to a sixth embodiment of the present invention. In the sixth embodiment, in contrast to the fifth embodiment shown in FIG. 7, one end side of a part of the plurality of ventilation holes 61 penetrating in the longitudinal direction in the outer peripheral portion of the stator core 19 is fixed. It communicates with the drive-side machine space via the communication port 65 provided in the slave member, and the other end communicates with the counter-drive-side machine space via the communication port 66 provided in the stator member. The same elements as those in FIG.

  In FIG. 9, as in the fifth embodiment shown in FIG. 7, a plurality of ventilation holes 61 are provided in the outer peripheral portion of the stator core 19, and the ventilation holes 61a and 61b are divided. An outside air entry path 63 provided in the frame 62 communicates with the ventilation hole 61a. One end side of the other ventilation hole 61 b communicates with the interior space on the driving side via a communication port 65 provided on the driving side frame 29, and the other end side via a communication port 66 provided on the non-driving side frame 30. To communicate with the space on the opposite drive side.

  According to the sixth embodiment, similarly to the fifth embodiment, the outside air is circulated to the several ventilation holes 61a by the ventilation fans 32, and the inside air is circulated to the remaining ventilation holes 61b by the ventilation fans 32. Circulate. Therefore, the inside air is cooled by circulating the inside air through the ventilation holes 61b of the stator core 19 cooled by the outside air, and the inside can be cooled by circulating the cooled inside air in the machine.

(Seventh embodiment)
FIG. 10 is a cross-sectional view of a vehicle drive fully-closed electric motor according to a seventh embodiment of the present invention. The seventh embodiment is different from the fifth embodiment shown in FIG. 7 in that a cooling air passage 52 extending in the longitudinal direction is provided on the outer peripheral portion of the electric motor body, and the inner wall surface of the cooling air passage 52 and A plurality of cooling fins 55 and 56 are provided on the outer wall surface, and one end of the cooling air passage 52 is communicated with the inner space of the driving side machine through an outlet 53 provided in the stator member on the driving side. The other end is communicated with the in-machine space on the counter-drive side via an inlet 54 provided in the stator member on the counter-drive side. The same elements as those in FIG.

  10, in the same manner as the fifth embodiment shown in FIG. 7, a plurality of ventilation holes 61 penetrating in the axial direction are provided in the outer peripheral portion of the stator core 19, and the drive side frame 29 of the ventilation holes 61 is provided in the drive side frame 29. It communicates with the outer peripheral side space of the outside air blowing blade 34 of the ventilation fan 32 through the provided outside air entry path 63, and is opened to the outside through the outside air outlet 64 provided in the non-driving side frame 30 of the ventilation hole 61. is there. Further, a cooling air passage 52 extending in the longitudinal direction is attached to the outside of the electric motor, and the outer peripheral space of the internal air circulation blade 35 of the ventilation fan 32 is connected to the cooling air passage 52 through the communication port 53 provided in the drive side frame 29. Communicate. A plurality of cooling fins 55 and 56 are provided on the outer peripheral wall and the inner peripheral wall of the cooling air passage 52.

  According to the seventh embodiment, the cooling outside air blown from the ventilation fan 32 flows through the plurality of ventilation holes 61 to cool the electric motor. Further, the inside air blown by the ventilation fan 32 circulates and circulates in the machine through the cooling air passage 52, and the inside air is cooled by the outside air by the cooling fins 55 and 56 in the process of passing through the cooling air passage 52, so that each part in the machine is cooled. To do.

(Eighth embodiment)
FIG. 11 is a partial cross-sectional view on the non-driving side of a fully-closed electric motor for driving a vehicle according to an eighth embodiment of the present invention, and FIG. This eighth embodiment is different from the first embodiment shown in FIG. 1 in that the cover 41 that forms the annular cooling air passage 42 provided on the inner side surface of the bearing support member on the counter driving side is provided. A plurality of cooling fins 45 and 68 are provided on one or both of the inner wall and the outer wall.

  11 and 12, the housing 15 incorporating the bearing 14 is provided on the inner diameter side of the counter-driving side frame 30, and the auxiliary fan 38 is provided at the shaft end outside the machine 14 to cover the outer peripheral side of the auxiliary fan 38. A cover 39 is provided. Further, an annular cooling air passage 42 is formed on the inner side surface of the housing 15 by the cover 41, and the outside air inlets 43a and 43b provided in two places in the cooling air passage 42 are used for the auxiliary fan 38 in the cover 39. It communicates with the outer peripheral space, and further communicates with the outside space through the outside air flow outlets 44a and 44b in the cooling air passage 42. A plurality of cooling fins 45 are provided radially on the wall surface of the cover 41 on the interior space side, and a plurality of cooling fins 68 are provided on the wall surface in the cooling air passage 42 of the cover 41 in the circumferential direction. .

  According to the eighth embodiment, the cooling outside air blown by the rotation of the auxiliary fan 38 flows into the cooling air passage 42 from the two external air inlets 43a and 43b, and after flowing through the cooling air passage 42, the two places From the outside air flow inlets 44a and 44b. For this reason, the ventilation amount of the cooled outside air is increased, the cooling performance of the bearing is improved, and the outside air flow inlets 43a and 43b are increased, so that the entire bearing portion is uniformly cooled. In addition, since a plurality of cooling fins 45 and 68 are provided on the inner and outer walls of the cooling air passage 42, the heat of the internal circulation air is efficiently transferred to the outside air circulating in the cooling air passage 42, and the cooling effect of the internal device is obtained. improves.

(Ninth embodiment)
FIG. 13 is a cross-sectional view of a fully-closed motor for driving a vehicle according to a ninth embodiment of the present invention, and FIG. 14 is a partial detailed view of the non-drive side of FIG. The ninth embodiment is similar to the first embodiment shown in FIG. 1 in that a bearing bracket having a bearing is provided on the non-driving side as well as the driving side, and a ventilation fan is provided inside the machine by the bearing. The cooling fins are provided radially on the surface facing the counter-flow side color ventilation fan. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  Similarly to the driving side, the non-driving side is provided with a ventilation fan 32 'on the rotor shaft 16 at a position inside the machine relative to the bearing bracket 13' as a bearing support member, and the outer peripheral portion of the ventilation fan 32 'and the stator member A circumferential minute gap portion (labyrinth portion) 33 ′ is formed between the inner peripheral portion, and a plurality of outdoor air blowing blades 34 ′ arranged radially on the outside wall surface of the ventilation fan 32 ′ are provided and counter-driven. A plurality of outside air intakes 36 ′ are provided on the side surface of the bearing bracket 13 ′, which is the side bearing support member, and a plurality of outside air intake blades 34 ′ of the ventilation fan 32 ′ in the counter driving side stator member are provided at the outer peripheral position. An exhaust port 37 'is provided. Further, cooling fins 69 are provided on the surface facing the ventilation fan 32 '.

  As shown in FIG. 14A, cooling fins 69 are provided on the surface of the counter drive side collar 70 facing the ventilation fan 32 ′. The cooling fins 69 are provided radially as shown in FIG.

  According to the ninth embodiment of the present invention, the cooling fins 69 are provided radially on the end face of the collar 70, so that outside air flows into the bearing and agitates when the electric motor rotates, and the collar 69 at the end of the bearing is stirred. The heat generated from the bearing is transmitted to the cooling fin 69 and dissipated. Therefore, the heat generation of the motor bearing can be suppressed, and the size and weight can be reduced.

  Each of the above embodiments of the present invention has been described for an induction motor. However, the present invention can be similarly applied to a synchronous motor in which a permanent magnet is embedded in a rotor core.

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 partially cutaway cross-sectional view taken along line BB in FIG. 1. Sectional drawing of the fully-closed motor for a vehicle drive concerning the 2nd Embodiment of this invention. FIG. 4 is a side view of FIG. 3. Sectional drawing of the fully-closed motor for a vehicle drive concerning the 3rd Embodiment of this invention. The partial sectional view by the side of the drive of the fully closed type motor for vehicles concerning a 4th embodiment of the present invention. Sectional drawing of the fully closed type motor for a vehicle drive concerning the 5th Embodiment of this invention. CC sectional drawing of FIG. Sectional drawing of the fully-closed motor for a vehicle drive concerning the 6th Embodiment of this invention. Sectional drawing of the fully-closed motor for a vehicle drive concerning the 7th Embodiment of this invention. The fragmentary sectional view by the side of the non-driving side of the fully-closed type motor for vehicles drive concerning the 8th embodiment of the present invention. The DD arrow line view of FIG. Sectional drawing of the fully-closed motor for a vehicle drive concerning the 9th Embodiment of this invention. The fragmentary detailed view by the side of the non-driving side of the fully closed type motor for vehicles drive concerning the 9th embodiment of the present invention. Sectional drawing which shows an example of the conventional vehicle-drive fully-closed electric motor. Sectional drawing in the AA of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Stator frame, 12 ... Bearing, 13 ... Bearing bracket, 14 ... Bearing, 15 ... Housing, 16 ... Rotor shaft, 17 ... Rotor core, 18 ... Rotor bar, 19 ... Stator iron core, 20 ... Stator coil, 21 ... Ventilation fan , 22 ... Cover, 23 ... Cooling air passage, 24 ... Cooling fin, 25 ... Support arm, 26 ... Bogie frame, 27 ... Wheel, 28 ... Rail, 29 ... Drive side frame, 30 ... Non-drive side frame, 31 ... Air hole, 32 ... ventilation fan, 33 ... minute gap, 34 ... outside air blowing blade, 35 ... inside air circulation blade, 36 ... outside air intake port, 37 ... exhaust port, 38 ... auxiliary fan, 39 ... cover, 40 ... outside air intake port, DESCRIPTION OF SYMBOLS 41 ... Cover, 42 ... Cooling airway, 43 ... External airflow inlet, 44 ... External airflow outlet, 45 ... Cooling fin, 46 ... Cover, 47 ... Circulating airway, 48 ... 50, cooling fin, 51 ... cooling fin, 52 ... cooling air passage, 53 ... outflow port, 54 ... inflow port, 55 ... cooling fin, 56 ... cooling fin, 57 ... cover, 58 ... External airflow path, 59 ... cooling fin, 60 ... cooling fin, 61 ... ventilation hole, 62 ... frame, 63 ... outside air entry path, 64 ... outside air outlet, 65 ... communication port, 66 ... communication port, 67 ... frame, 68 ... Cooling fins, 69 ... Cooling fins, 70 ... Color

Claims (10)

A cylindrical stator iron core is provided on the inner peripheral side of the central portion in the longitudinal direction of the substantially cylindrical stator member, and a plurality of stator coils are provided on the inner peripheral portion of the stator iron core. In a fully-closed electric motor for driving a vehicle in which bearing support members having bearings for supporting both ends of the driving side and the non-driving side are provided at both ends of the stator member, and a rotor core is provided at the center of the rotor shaft, the driving side Is provided with a ventilation fan on the rotor shaft at a position on the inner side of the bearing support member, and a circumferential minute gap is formed between the outer periphery of the ventilation fan and the inner periphery of the stator member. A plurality of outside air blowing blades arranged radially on the outside wall surface of the ventilation fan, and a plurality of inside air circulation blades arranged radially on the inside wall surface of the ventilation fan. A plurality of outside air intakes are provided on the side surface of the receiving support member, a plurality of exhaust ports are provided at the outer peripheral position of the outside air blowing blade of the ventilation fan in the stator member on the driving side, An annular cooling air passage is provided on the machine inner side surface of the bearing support member, an auxiliary fan is provided at an end of the rotor shaft outside the machine of the bearing support member, and one end in the cooling air passage is an outer peripheral portion of the auxiliary fan. Fully closed type for driving a vehicle characterized in that the space communicates with one or a plurality of external airflow inlets, and the other end of the cooling air passage communicates with the space outside the machine through one or a plurality of external airflow outlets. Electric motor. One or more circulating air passages extending in the longitudinal direction are provided on the outer peripheral portion of the stator core, and one end of the circulating air passage communicates with the internal space on the drive side through a communication port provided in the stator member. 2. The fully-closed electric motor for driving a vehicle according to claim 1, wherein the other end of the circulating air passage is communicated with an in-machine space on the non-driving side through a communication port provided in the stator member. The fully-closed electric motor for driving a vehicle according to claim 2, wherein a plurality of cooling fins are provided on one or both of an outer wall surface and an inner wall surface of the cover forming the circulation air passage. A cooling air passage extending in the longitudinal direction is provided on the outer peripheral portion of the electric motor body, a plurality of cooling fins are provided on the inner wall surface and the outer wall surface of the cooling air passage, and one end of the cooling air passage is used as a driving-side stator member. Communicated to the drive-side machine space via the provided outlet, and communicated the other end of the cooling air passage to the non-drive-side machine space via the inlet provided on the counter-drive side stator member. The fully-closed electric motor for driving a vehicle according to claim 1. A cover is provided on the outer peripheral portion of the stator member on the driving side, an external airflow passage is formed between the stator member, and an inner diameter side of the external airflow passage is communicated with an exhaust port provided in the stator member, 5. The outside air flow passage is opened to the outside with the outer diameter side facing in the longitudinal direction, and a plurality of cooling fins are provided on the inner wall surface and the outer wall surface of the stator member. A fully-closed electric motor for driving a vehicle according to any one of the above. A cylindrical stator iron core is provided on the inner peripheral side of the central portion in the longitudinal direction of the substantially cylindrical stator member, and a plurality of stator coils are provided on the inner peripheral portion of the stator iron core. In a vehicle drive fully-closed motor in which a bearing support member having bearings for supporting both ends of the drive side and the non-drive side is provided at both ends of the stator member, and a rotor core is provided at the center of the rotor shaft, the stator core A plurality of ventilation holes penetrating in the longitudinal direction are provided in the outer peripheral portion of the motor, and a ventilation fan is provided on the rotor shaft at a position inside the machine from the bearing support member on the drive side. A circumferential minute gap is formed between the stator member and the inner peripheral portion, and a plurality of outdoor air blowing blades are provided radially on the outer surface of the ventilation fan, and the inner side of the ventilation fan is provided. A plurality of internal air circulation blades arranged radially on the surface are provided, a plurality of external air intakes are provided on the side surface of the bearing support member on the drive side, and the outer peripheral space of the external air blowing blade of the ventilation fan and the stator iron core An outside air approach path that communicates with one end of the outer peripheral ventilation hole is provided, and an outside air discharge port that opens the other end of the ventilation hole to the outside of the machine is provided on the non-driving side. An annular cooling air passage is provided, an auxiliary fan is provided at the end of the rotor shaft outside the machine of the bearing support member, and one end of the cooling air passage is provided in one or more outer peripheral spaces of the auxiliary fan. A fully-closed electric motor for driving a vehicle, characterized in that it communicates at an air flow inlet and communicates the other end of the cooling air passage to an external space at one or a plurality of external air flow outlets. One end side of a part of the plurality of ventilation holes penetrating in the longitudinal direction to the outer peripheral portion of the stator core is communicated with the drive-side machine space via a communication port provided in the stator member, and the other end side is fixed to the stator. 7. The vehicle drive fully-closed electric motor according to claim 6, wherein the vehicle drive fully-closed electric motor is communicated with an interior space on the counter drive side through a communication port provided in the member. A cooling air passage extending in the longitudinal direction is provided on the outer peripheral portion of the electric motor body, a plurality of cooling fins are provided on the inner wall surface and the outer wall surface of the cooling air passage, and one end of the cooling air passage is used as a driving-side stator member. The other end of the cooling air passage communicated with the inner space on the counter-drive side through the inlet provided on the stator member on the counter-drive side through the provided outlet. The fully-closed electric motor for driving a vehicle according to claim 6. A plurality of cooling fins are provided on one or both of an inner wall and an outer wall of a cover that forms an annular cooling air passage provided on the inner surface of the bearing support member on the counter driving side. The fully-closed electric motor for driving a vehicle according to any one of claims 1 to 8. In a rotating electrical machine in which bearing brackets are provided with bearings at both ends in the axial direction of the stator frame, both ends of the rotor shaft are supported by the bearings, and a ventilation fan is attached to the inside of the machine by the respective bearings on both ends of the rotor shaft. A fully-enclosed electric motor for driving a vehicle, characterized in that cooling fins are provided radially on a surface facing the ventilation fan of the color opposite to the driving side.

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