JP2004187352A - Totally enclosed motor for drive of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a totally enclosed motor where the noise of a ventilating fan is low and the exchange cycle of lubricating grease becomes long by making the temperature rise of a bearing small and further downsizing or capacity (output) increment can be achieved. <P>SOLUTION: In this totally enclosed motor for the drive of a vehicle, outside air is circulated by two pieces of ventilating fans 26 and 27 at both ends, and the quantity of air of each ventilating fan is halved to downsize the ventilating fan and make its diameter small and reduce the operation noise of the ventilating fan. Moreover, bearings 4 and 5 on both sides are cooled equivalently by circulating outside air along outer walls of brackets 21 and 22 on both sides by the ventilating fans on both sides so as to prevent a bearing from being at high temperatures. Furthermore, heat conducted from a rotor shaft 6 to the bearing is cooled by a ventilating fan 31 attached in a position inside a machine so as to further reduce the temperature rise of the bearing, thereby preventing the early deterioration of the lubricating grease of the bearing and elongating the exchange life of the grease. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle drive fully closed motor for driving a vehicle such as a railway.
[0002]
[Prior art]
2. Description of the Related Art Generally, in a railway vehicle such as a vehicle, an electric motor for vehicle driving is loaded on a bogie disposed below a vehicle body, and the rotational force of the electric motor is transmitted to wheels via a gear device to cause the vehicle to travel. Conventionally, this type of vehicle driving motor has a structure shown in FIG.
[0003]
The conventional motor for driving a vehicle shown in FIG. 12 has a cylindrical frame 1 as a fixed member, a bracket 2 is attached to one side of the frame 1, and a housing 3 is provided at the center of the other side of the frame 1. , And both ends of the rotor shaft 6 are rotatably supported by bearings 4 and 5 provided at the center of the bracket 2 and the housing 3 respectively.
[0004]
A rotor core 7 is fixed to a central portion of the rotor shaft 6 in the axial direction, and a rotor bar 8 is embedded in each of a number of grooves formed on the outer peripheral surface of the rotor core 7. Both ends of each rotor bar 8 are rotor cores. 7, and the protruding portions are integrally connected by end rings to form a cage rotor of the induction motor. The rotor core 7 is provided with a plurality of ventilation holes 7a penetrating in the same axial direction.
[0005]
A cylindrical stator core 10 is attached to the inner periphery of the frame 1, and a stator coil 11 is housed in a number of grooves formed on the inner periphery of the stator core 10. The coil end portion of the stator coil 11 has a shape projecting on both sides of the stator core 10.
[0006]
A uniform gap is formed between the inner peripheral surface of the stator core 10 and the outer peripheral surface of the rotor core 7. The drive side end 6a of the rotor shaft 6 projects outside the machine. A coupling (cup link) for coupling with the driving gear device is attached to the protruding drive side end 6a. A ventilation fan 9 is fixed to an in-machine portion of the rotor shaft 6. The ventilation fan 9 has a plurality of blades 9a radially arranged from the center. A plurality of exhaust ports 2a are provided in a portion of the bracket 2 facing the outer peripheral portion of the ventilation fan 9 along the circumferential direction.
[0007]
An air inlet 1a is provided above the non-drive side of the frame 1, and a ventilation filter 12 is attached so as to cover the air inlet 1a. The outside air inlet of the ventilation filter 12 is provided for capturing dust. The filter 12a is attached.
[0008]
The entire motor shown in FIG. 12 has a mounting arm portion provided on the frame 1 fastened and fixed to a bogie frame with bolts, and the rotational force of the motor is transmitted from the gear device to the wheels via a joint connected to the rotor shaft end 6a. To make the vehicle run.
[0009]
During operation of the electric motor, the stator coil 11 and the rotor bar 8 of the electric motor generate heat, so that outside air is circulated through the electric motor to cool it, thereby suppressing a rise in the temperature of the electric motor. This cooling action is as follows.
[0010]
During operation, the ventilation fan 9 is rotated by the rotor shaft 6, and discharges air inside the machine from the exhaust port 2a to the outside of the machine, and accordingly, outside air is sucked into the machine from the air inlet 1a. The outside air sucked into the machine flows into the machine through the air inlet 1a through the ventilation filter 12, and then passes through the ventilation hole 7a of the rotor core 7, and between the outer circumference of the rotor core 7 and the inner circumference of the stator core 10. The air flows into the ventilation fan 9 through the gap therebetween, and is discharged to the outside from the exhaust port 2a by the rotation of the ventilation fan.
[0011]
By circulating the outside air inside the machine in this way, the rotor bar 8, the stator coil 11 and each part in the machine are cooled, so that the temperature rise of the rotor bar 8 and the stator coil 11 does not exceed the allowable temperature.
[0012]
However, the outside air around the vehicle drive motor mounted on the underfloor trolley such as a train contains a large amount of dust that is rolled up when the vehicle is running, and the taken-in outside air is in a severely polluted environment. Therefore, in the conventional motor for driving a vehicle shown in FIG. 12, dust is captured by the filter 12a of the ventilation filter 12 with respect to the outside air taken into the machine to purify the outside air. As a result, eye catching gradually occurs in the filter 12a, and the amount of air flow inside the machine decreases. For this reason, there is a technical problem that requires periodic cleaning and maintenance of the filter at short intervals, and requires a great deal of labor.
[0013]
In order to solve this problem, in recent years, a fully-closed external fan-cooled vehicle drive motor has been developed. FIG. 13 shows the structure of the fully enclosed external fan cooling type electric motor. More specifically, a bracket 14 is provided at a drive-side end of a bottomed cylindrical frame 13, and a housing 3 is provided at a central portion on the opposite side of the drive. A stator core 10 is provided on an inner peripheral portion of the frame 13.
[0014]
The rotor shaft 6 is rotatably supported by bearings 4 and 5 attached to the bracket 14 and the housing 3, respectively. A rotor core 7 is provided at the axial center of the rotor shaft 6. The opposite end of the rotor shaft 6 on the side opposite to the drive protrudes outside the machine, and a ventilation fan 15 is attached to this protruding portion.
[0015]
A number of cooling fins 13 a extending in the axial direction are provided on the outer peripheral surface of the frame 13, and the cover 16 is covered so as to cover the cooling fins 13 a, so that the cooling fin 13 a is surrounded by the inside of the cover 16 and the outside of the frame 13. A space extending in the axial direction is formed, and this space is used as a ventilation path 17.
[0016]
The drive side of the ventilation path 17 is open to the outside, and the opposite drive side is open toward the outer peripheral side of the ventilation fan 15. A cover 18 is attached to the non-drive end of the electric motor, and an outside air intake 18 a for the ventilation fan 15 is formed in the center of the cover.
[0017]
The fully closed external fan cooling type electric motor shown in FIG. 13 is of a fully closed type in which the inside of the motor is cut off from the outside, so that a large amount of heat generated therein is mainly provided on the outer peripheral surface of the frame 13. It is discharged from the cooled fins 13a. During operation, the outside air is sent into the ventilation passage 17 on the outer peripheral portion of the frame 13 by the rotation of the ventilation fan 15 and is circulated in the axial direction, so that the heat inside the machine is generated from the large number of cooling fins 13 a arranged in the ventilation passage 17. To the outside air.
[0018]
This fully enclosed fan cooling type electric motor does not allow the outside air to flow through the inside of the machine, so that the inside of the machine is not polluted by dust mixed in the outside air. There is also an advantage that it is unnecessary.
[0019]
[Problems to be solved by the invention]
However, the fully-closed external fan-cooled electric motor under development shown in FIG. 13 does not require a filter, thereby making it possible to save labor for maintenance. However, there is a technical problem described below, and improvement has been desired.
[0020]
First, since the heat generating portion in the machine is indirectly cooled by the cooling fins 13a via the frame 13, the heat radiation performance is low. Therefore, in order to obtain the cooling performance like the conventional motor shown in FIG. 12, it is necessary to increase the amount of air flow by the ventilation fan 15 and increase the cooling performance of the cooling fins 13a. However, in order to increase the ventilation volume, it is necessary to increase the size and diameter of the ventilation fan 15, so that the noise of the ventilation fan 15 during operation increases. In recent years, it has been desired to reduce the noise of the driving motor in order to improve the ride comfort of vehicles and the impact on the surrounding environment. Therefore, it is not desirable to increase the noise by increasing the size of the ventilation fan. Was desired.
[0021]
Second, there is a problem that the temperature rise of the bearing increases. Since the bearing is lubricated by the lubricating grease filled therein, if the temperature of the bearing increases, the deterioration of the lubricating grease is promoted, and the grease needs to be replaced at an early stage. In a fully-closed fan-cooled electric motor, since the outside air does not flow through the inside of the machine, the heat of the rotor is easily transmitted to the bearing portion, and the temperature rise of the bearing portion is larger than that of the conventional type. Further, since the drive side bracket 14 is located on the exhaust side of the cooling outside air, it is heated by the exhaust air temperature, and furthermore, since the cooling air does not hit the bearings, the temperature of the drive side bearing 4 is greatly increased. To rise. In vehicle drive motors, while the progress of grease renewal has been extended to save maintenance, progress in lubricating grease hastened due to an increase in the temperature rise of the bearings, and grease was replaced sooner. There is a technical problem that it is necessary, and its improvement has been desired.
[0022]
Third, there is a problem in that the cooling capacity is reduced and the size is increased and the mass is increased. In the case of a fully-closed fan-cooled motor, the heat inside the motor is released to the outside air by the cooling fins 13a on the outer peripheral surface of the frame, so that the cooling efficiency is lower than that of the conventional motor shown in FIG. Therefore, the temperature rise of the stator coil 11 and the rotor bar 8 exceeds an allowable value, and in order to suppress the temperature rise, it is necessary to increase the size of the stator coil 11 and the rotor bar 8 and reduce heat generation. Therefore, the size of the motor becomes larger than the capacity (output), and the mass increases. Further, the cooling performance of the downstream side of the circulating cooling air decreases with an increase in the temperature of the circulating outside air, so that the temperature rise of the internal stator coil and the portion of the rotor bar located on the exhaust side becomes larger than other portions. , The state of local heat. Therefore, in order to suppress the temperature rise of the local heat portion within an allowable value, the size of the electric motor must be further increased. In a train or the like, since the drive motor is mounted in a limited space in the bogie, mounting may be difficult if the size of the drive motor is large. On the contrary, if the physique is designed to be able to be mounted in the space, the capacity of the electric motor is insufficient, and the desired performance cannot be obtained. Therefore, realization of a fully-closed motor for driving a vehicle that eliminates local heat and has good heat dissipation performance has been desired.
[0023]
As a solution to this problem, the present inventors have disclosed a novel fully-closed motor for driving a vehicle in the specification of Japanese Patent Application No. 2002-236600. The fully-closed motor for driving a vehicle according to this application has a structure in which ventilation fans are attached to both ends of shafts outside the machine, and outside air is circulated to the outer peripheral portion of the motor by both ventilation fans. This motor eliminates contamination inside the machine, reduces the noise of the ventilation fan, suppresses the temperature rise of the bearing on the exhaust side, equalizes the temperature rise of the bearings on both sides, and reduces the size and weight or increases the output by improving the cooling effect Can be achieved.
[0024]
The motor for driving a vehicle presented in Japanese Patent Application No. 2002-236600 can be used for a long time without disassembly by eliminating contamination inside the machine, but the lubricating grease of the bearing gradually deteriorates due to use. Therefore, when the usage limit is reached, it is necessary to disassemble the motor and renew grease.
[0025]
Generally, in a fully-closed motor, the heat of the rotor is more easily transmitted to the bearing portion than the rotor shaft, and the temperature tends to increase more than the bearing of the in-machine ventilation cooling type motor.
[0026]
Since the temperature rise of the bearing is a major factor in the deterioration of the bearing lubrication grease, the temperature of the bearing tends to be relatively large. Things were difficult.
[0027]
In the fully-closed motor for driving a vehicle described in the specification of Japanese Patent Application No. 2002-236600, the temperature rise of the bearing can be reduced and the replacement cycle of the lubricating grease can be lengthened. However, if the temperature rise of the bearing portion can be further reduced, the grease can be reduced. Can be further extended, and the non-disassembly period of the electric motor can be further lengthened.
[0028]
SUMMARY OF THE INVENTION The present invention is to provide a totally-closed electric motor for driving a vehicle as described above, which eliminates contamination inside the apparatus, reduces noise of a ventilation fan for cooling, and further reduces temperature rise of a bearing portion. Accordingly, it is an object of the present invention to provide a fully-closed motor for driving a vehicle in which the replacement cycle of lubricating grease is lengthened, and furthermore, the cooling performance is improved and local heat is eliminated, so that the size and weight or capacity (output) can be increased.
[0029]
[Means for Solving the Problems]
A fully-closed motor for driving a vehicle according to claim 1, wherein a rotor core is disposed on an inner peripheral side of a stator core, a rotor shaft is coupled to a center portion of the rotor core, and one axial end of the stator core is provided. A first bracket containing a first bearing is attached to the portion, a second bracket containing a second bearing is attached to the other axial end of the stator core, and the rotor shaft is attached to the first shaft. And a first ventilation fan mounted on each of the first and second bearings built in each of the second brackets, and mounted on one end side of the rotor shaft so as to be adjacent to the inside of the first bearing. An outer peripheral portion of the first shielding plate is fixed to the first bracket, and an inner peripheral side of the first shielding plate is arranged so as to face the rotor shaft to form a minute gap on the circumference. , The first ventilation fan A second ventilation fan is attached to the other end side of the rotor shaft so as to be adjacent to the inside of the second bearing portion, and an outer peripheral portion of the second shielding plate is attached to the other end of the rotor shaft. The second ventilation fan is fixed to the second bracket, and is arranged such that the inner peripheral side of the second shielding plate faces the rotor shaft to form a minute gap on the circumference, and accommodates the second ventilation fan. A plurality of first ventilation holes and a plurality of second ventilation holes are formed in the vicinity of the outer periphery of the stator core so as to penetrate in the axial direction. A plurality of air inlets are provided at a portion on the inner diameter side of the blade position of the first ventilation fan, and a first outside air ventilation passage for receiving cooling air from the first ventilation fan is provided at an outer peripheral portion of the first bracket. Providing the first outside air ventilation path with the first ventilation hole One end is connected to the other end, the other end of the first ventilation hole is open to the atmosphere, and a plurality of air inlets are provided on a side of the second bracket at a portion on the inner diameter side of the blade position of the second ventilation fan. A second outside air passage for receiving cooling air from the second ventilation fan is provided on an outer peripheral portion of the second bracket, and the second outside air passage is provided at one end of the second ventilation hole. And the other end of the second ventilation hole is open to the atmosphere.
[0030]
In the fully closed electric motor for driving a vehicle according to the first aspect of the present invention, since the outside air is circulated by the two ventilation fans on both ends, the air volume of each ventilation fan is reduced by half and the ventilation fan is reduced in size and diameter. To reduce the noise during operation of the ventilation fan. In addition, the ventilation fans on both sides allow the outside air to flow along the outer walls of the brackets on both sides to cool the bearings on both sides equivalently, avoiding the temperature rise of only one bearing, and lubricating due to the high temperature. Prevents premature deterioration of grease.
[0031]
Furthermore, the heat transmitted from the rotor shaft to the bearing is released to the cooling outside air by the ventilation fan attached to the inside of the bearing, so the heat transmitted to the bearing is reduced, the temperature rise of the bearing is further reduced, and the lubricating grease is removed. Prevents deterioration and extends grease replacement life.
[0032]
In addition, by circulating the outside air with the ventilation fans on both sides, the entire motor is cooled in a well-balanced manner, eliminating the occurrence of local heat, and at the same time, the brackets on both sides are also cooled efficiently by the outside air to improve the cooling performance of the entire motor. To reduce the size and weight of the motor or increase the capacity.
[0033]
The fully-closed motor for driving a vehicle according to claim 2, wherein a rotor core is arranged on an inner peripheral side of the stator core, a rotor shaft is connected to a center portion of the rotor core, and one axial end of the stator core is provided. A first bracket containing a first bearing is attached to the portion, a second bracket containing a second bearing is attached to the other axial end of the stator core, and the rotor shaft is attached to the first shaft. And a first ventilation fan mounted on each of the first and second bearings built in each of the second brackets, and mounted on one end side of the rotor shaft so as to be adjacent to the inside of the first bearing. An outer peripheral portion of the first shielding plate is fixed to the first bracket, and an inner peripheral side of the first shielding plate is arranged so as to face the rotor shaft to form a minute gap on the circumference. , The first ventilation fan A second ventilation fan is attached to the other end side of the rotor shaft so as to be adjacent to the inside of the second bearing portion, and an outer peripheral portion of the second shielding plate is attached to the other end of the rotor shaft. The second ventilation fan is fixed to the second bracket, and is arranged such that the inner peripheral side of the second shielding plate faces the rotor shaft to form a minute gap on the circumference, and accommodates the second ventilation fan. A circulating fan is attached to the rotor shaft in the interior space partitioned by the first shielding plate or the second shielding plate, and penetrates in the axial direction near the outer periphery of the stator core. A plurality of first ventilation holes, a second ventilation hole, and a third ventilation hole are respectively formed so as to enter a portion of the side surface of the first bracket closer to the inside diameter than the blade position of the first ventilation fan. A plurality of air vents, the first bracket A first outside air passage for receiving cooling air from the first ventilation fan is provided in an outer peripheral portion, and the first outside air passage is communicated with one end of the first ventilation hole. The other end of the second bracket is open to the atmosphere, and a plurality of air inlets are provided on a side of the second bracket on the inner diameter side of the blade position of the second ventilation fan, and an outer peripheral portion of the second bracket is provided. A second outside air passage for receiving cooling air from the second ventilation fan, the second outside air passage communicating with one end of the second ventilation hole, The third end is opened to the atmosphere, and both open ends of the third ventilation hole are communicated with the internal space through respective internal air flow passages provided in the first and second brackets. Ventilation holes are generated in the circulating air generated by the rotation of the circulating fan. It is characterized by having a ventilation path.
[0034]
In the fully closed electric motor for driving a vehicle according to the second aspect of the present invention, a third ventilation hole is additionally provided on the outer peripheral side of the stator core in addition to the configuration of the first aspect of the invention, and furthermore, penetrates the rotor core in the axial direction. By providing a plurality of ventilation holes, connecting both ends of a third ventilation hole additionally provided to the stator core to the internal space, and providing an internal air circulation fan on a rotor shaft in the airplane, the internal air circulation fan rotates during operation to rotate the internal air circulation fan. Air is circulated through the third ventilation hole of the stator core and the ventilation hole of the rotor core to cool the air inside the machine. Thereby, the cooling performance inside the machine is improved, and in particular, the rise in the temperature of the rotor is reduced.
[0035]
According to a third aspect of the present invention, in the fully closed electric motor for driving a vehicle according to the first or second aspect, a plurality of fins are radially provided on the back surface of one or both of the first and second ventilation fans. A plurality of ventilation holes penetrating to the back side are provided on the inner diameter side from the fin position of the fan, and a plurality of heat absorbing fins are provided on one or both of the inner wall surfaces of the first and second shielding plates. A plurality of radiating fins are radially provided on the back side of one or both of the second ventilation fans.
[0036]
In the fully closed electric motor for driving a vehicle according to the third aspect of the present invention, the fin provided on the inside of the shield plate effectively absorbs the heat inside the machine, and the fin provided on the ventilation fan side effectively prevents the outside air flowing through. By discharging the air, the cooling performance of the air inside the machine is improved, and the temperature rise in each part in the machine is reduced.
[0037]
According to a fourth aspect of the present invention, in the fully closed electric motor for driving a vehicle according to the first to third aspects, a plurality of heat absorbing fins are provided on one or both inner walls of the first and second brackets, and an outside air ventilation passage is provided. A large number of radiating fins are provided on at least one of the inner wall surface and the outer wall.
[0038]
In the fully closed electric motor for driving a vehicle according to the fourth aspect of the present invention, the heat inside the machine is effectively absorbed by the bracket by the heat absorbing fins provided on the inner wall surface facing the inside space of the bracket, and the heat absorbing fins are provided in the outside air passage and on the outer wall. By effectively releasing the heat of the bracket to the outside air circulated by the radiating fins, the cooling performance of the air inside the machine is improved, and the rise in the temperature of each part inside the machine is reduced.
[0039]
According to a fifth aspect of the present invention, in the fully closed motor for driving a vehicle according to the first, second, or fourth aspect, one or both of the first and second ventilation fans are provided with an inner end of the rotor core. While being closely attached to the side surface, a large number of cooling fins are provided on one or both of the first and second ventilation fans and / or on the surface that contacts the outside air circulation space, One or both of the inner peripheral portions of the first and second shielding plates are opposed to an outer peripheral step surface provided on a part of one or both of the first and second ventilation fans to form a circumference. It is characterized by forming the above minute gap.
[0040]
In the fully closed electric motor for driving a vehicle according to the fifth aspect of the invention, the heat of the rotor core is efficiently transmitted to the ventilation fan, and the heat transmitted to the ventilation fan can be effectively released to the outside air flowing through the blades and the fins. Further, the cooling performance of the rotor is improved, and the rise in the temperature of the rotor is reduced.
[0041]
According to a sixth aspect of the present invention, in the fully closed electric motor for driving a vehicle according to the first to fifth aspects, the number of blades of the first ventilation fan and the number of the second ventilation fan are different from each other. The number of blades is set to a value that is not divisible by the number of blades.
[0042]
In the fully closed electric motor for driving a vehicle according to the sixth aspect of the present invention, the noise frequency caused by the blades of the two ventilation fans generated at the time of rotation is made different, thereby suppressing the noise amplification phenomenon due to the interference between the two noise frequencies. Eliminate the increase.
[0043]
According to a seventh aspect of the present invention, in the fully closed electric motor for driving a vehicle according to the fifth aspect, each of the rotor cores penetrates in the axial direction near the inner peripheral side of the rotor core and rotor core retainers disposed on both sides of the rotor core. A plurality of ventilation holes are provided, and the in-machine spaces on both sides of the rotor core are communicated with the ventilation holes, and formed on the inner wall surface of the first ventilation fan between the first shielding plate and the first shielding plate. A plurality of fins are radially provided at a portion closer to the center than the minute gap on the circumference of the circumference, and when the rotor core rotates, an inner peripheral surface of the stator core and an outer periphery of the rotor core by a fan action of the plurality of fins. The air inside the machine is circulated through a path that passes through a circumferential gap between the surface and a ventilation hole near the inner peripheral side of the rotor core.
[0044]
In the fully closed electric motor for driving a vehicle according to the present invention, the air inside the machine is moved by the fan action of the fin provided inside the first ventilation fan during rotation and the ventilation hole near the rotor inner peripheral side by the fan action. And the air in the machine cooled by the fins on the inside of the first ventilation fan is cooled by flowing through the outer peripheral surface of the rotor where the temperature is highest. Thereby, the cooling performance of the rotor is improved, and the cooling performance of each part in the machine is improved.
[0045]
According to an eighth aspect of the present invention, in the fully closed electric motor for driving a vehicle according to the fifth aspect, a rotor core retainer disposed near the inner peripheral side of the rotor core and on both sides of the rotor core, the first ventilation fan, and the A plurality of ventilation holes penetrating in the axial direction are provided near the inner peripheral side of each of the two ventilation fans, and the external spaces on both sides of the electric motor are communicated with the ventilation holes. .
[0046]
In the fully closed electric motor for driving a vehicle according to claim 8, the cooling performance of the rotor core is improved by allowing cooling air to flow inside the ventilation holes provided near the inner peripheral side of the rotor core during operation, thereby improving the cooling performance of the rotor core. By reducing the heat transfer from the rotor core to the bearing portion from the rotor shaft, the temperature rise of the bearing portion is further reduced.
[0047]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention. In the fully closed electric motor for driving a vehicle according to the first embodiment, the rotor core 7 is arranged on the inner peripheral side of the cylindrical stator core 19, and one end of the stator core 19 in the axial direction is interposed with the stator frame 20. Then, a first bracket 21 containing the first bearing 4 is attached, and a second bracket 22 containing the second bearing 5 is also provided at the other axial end of the stator core 19 via the stator frame 20. Is installed. The second bearing 5 is attached to the center of the second bracket 22 via a bracket 23.
[0048]
The rotor shaft 6 is connected to the inner periphery of the rotor core 7. Both ends in the axial direction of the rotor shaft 6 are supported by first and second bearings 4 and 5 built in first and second brackets 21 and 22, respectively.
[0049]
A first ventilation fan 26 is attached to one end of the rotor shaft 6 inside the bearing 4 adjacent to the bearing 4, and a second ventilation fan is installed to the inside of the bearing 5 at the other end adjacent to the bearing 5. A fan 27 is attached.
[0050]
Each of the first and second ventilation fans 26 and 27 has a plurality of radially arranged blades 26a and 27a, respectively. The number of blades of the first ventilation fan 26 and the number of blades of the second ventilation fan 27 are preferably different numbers, for example, 15:17, and are preferably set to numbers that are indivisible.
[0051]
A first shielding plate 24 having an outer peripheral portion fixed to the first bracket 21 is provided adjacent to the inside of the first ventilation fan 26. A minute gap on the circumference is formed between the inner peripheral surface 24a of the central hole portion of the shielding plate 24 and the outer peripheral surface of the rotor shaft 6.
[0052]
A second shielding plate 25 having an outer peripheral portion fixed to the second bracket 22 is provided adjacent to the inside of the second ventilation fan 27. A minute circumferential gap is also formed between the inner peripheral surface 25 a of the central hole portion of the shielding plate 25 and the outer peripheral surface of the rotor shaft 6.
[0053]
A large number of grooves are provided on the outer peripheral portion of the rotor core 7, and the rotor bar 8 is housed in the grooves. Both ends of each rotor bar 8 are extended laterally beyond the rotor core 7 and are united and integrated by an end ring to form a cage rotor of the induction motor.
[0054]
Numerous grooves are provided on the inner periphery of the stator core 19, and the stator coil 11 is housed in the grooves. The coil end portions at both ends of each stator coil 11 are formed so as to protrude laterally from the stator core 19.
[0055]
As shown in FIG. 4, a plurality of first ventilation holes 19a and a plurality of second ventilation holes 19b are formed near the outer periphery of the stator core 19 so as to penetrate in the axial direction.
[0056]
As shown in FIG. 2, a plurality of air inlets 21 a for taking in outside air are provided on a wall surface near the center of the first bracket 21. The air inlet 21a is located on the center side (smaller diameter side) than the inner diameter of the blade 26a of the first ventilation fan 26.
[0057]
A first outside air passage 21b, which receives cooling air from the first ventilation fan 26, is provided on the outer circumference (outer periphery side) of the first bracket 21. One end of one ventilation hole 19a is communicated via an introduction path 21c. The other end of the first ventilation hole 19a is open to the atmosphere by the ventilation hole 22c.
[0058]
As shown in FIG. 3, a plurality of air inlets 23 a for taking in outside air are provided on a side surface near the center of the bracket 23 attached to the second bracket 22. The air inlet 23a is located on the center side (smaller diameter side) than the inner diameter of the blade 27a of the second ventilation fan 27.
[0059]
A second outside air passage 22a for receiving cooling air from the second ventilation fan 27 is provided on the circumference of the second bracket 22, and the second outside air passage 22a is connected to one end of the second ventilation hole 19b. Are connected to each other through an introduction path 22b. The other end of the second ventilation hole 19b is open to the atmosphere by the exhaust hole 21d.
[0060]
As shown in FIG. 1, the entire electric motor is loaded in the bogie by fixing a portion of the stator arm 20 a integrally provided on the stator frame 20 to the bogie frame 50 with bolts. As shown in FIGS. 2 and 3, the rotor shaft end 6a projecting to one end of the motor is connected to a drive gear device (not shown) via a joint, and the rotational force of the motor is transmitted from the drive gear device. The power is transmitted to the wheels to drive the vehicle.
[0061]
Next, the operation of the vehicle drive fully-closed electric motor according to the first embodiment of the present invention will be described. As shown in detail in FIG. 2, during operation of the electric motor, outside air flows in from the air inlet 21a by the rotation of the first ventilation fan 26. The inflowing outside air flows through the first ventilation hole 19a from the first outside air ventilation passage 21b via the introduction passage 21c, and is discharged to the atmosphere side through the ventilation hole 22c.
[0062]
As shown in FIG. 3, the outside air flows in from the air inlet 23 a by the rotation of the second ventilation fan 27 that rotates simultaneously with the first ventilation fan 26. The inflowing outside air flows from the second outside air ventilation path 22a to the second ventilation hole 19b via the introduction path 22b, and is discharged to the atmosphere side from the exhaust hole 21d.
[0063]
As described above, in the vehicle drive fully-closed electric motor according to the first embodiment, the cooling outside air is supplied to the outer peripheral portions of the brackets 21 and 22 by the first and second ventilation fans 26 and 27 provided on both sides in the axial direction. Since cooling is performed by circulating the cooling air through the large number of ventilation holes 19a and 19b of the stator core 19, the cooling area of the entire motor and the heat radiation area are increased, and the cooling performance is improved. In particular, since the heat of the stator coil 11 attached to the inner peripheral side of the stator core 19 is directly transmitted, the temperature tends to be higher than that of other parts. By allowing cooling outside air to flow through 19a and 19b, cooling can be performed effectively, and a rise in temperature can be suppressed.
[0064]
Further, in the fully-closed motor for driving a vehicle according to the present embodiment, since the cooling outside air is evenly distributed to the outside of the motor and cooled by the ventilation fans 26 and 27 on both sides, the local heat of the internal stator coil 11 and the rotor bar 8 is reduced. (Local overheating) does not occur.
[0065]
Furthermore, in the vehicle drive fully-closed electric motor of the present embodiment, ventilation fans 26 and 27 mounted adjacent to the inside of both bearings 4 and 5 act as powerful radiators, and the rotor shaft 6 At the same time as cooling the heat transmitted to the bearings 4 and 5, the brackets 21, 22, and 23 to which the bearings 4 and 5 are attached are cooled by the outside air, so that the temperature rise of the bearings 4 and 5 can be significantly reduced.
[0066]
In addition, the fully-closed electric motor for driving a vehicle according to the present embodiment has a structure in which the first and second ventilation fans 26 and 27 are dispersed and cooled on both sides. That is, the ventilation fans 26 and 27 can be reduced in size and diameter. By reducing the size and diameter of the ventilation fans 26 and 27, the noise of each of the ventilation fans 26 and 27 during operation is significantly reduced, and the noise of the motor as a whole that combines both ventilation fans is also reduced as compared with the conventional case. Can be.
[0067]
By setting the number of blades of the first ventilation fan 26 and the number of blades of the second ventilation fan 27 to a different number and a value that is not divisible by the number of the blades, the generation of both the ventilation fans 26 and 27 during rotation is achieved. It is possible to prevent a phenomenon in which the noise frequencies overlap with each other and increase, and it is possible to prevent an increase in noise by employing two ventilation fans.
[0068]
Further, in the present embodiment, the in-machine space and the space through which the outside air flows communicate with each other at the minute gaps on the circumference formed on the inner diameter surfaces 24a and 25a of the shielding plates 24 and 25, respectively. Since the flow resistance of the portion is large, the outside air does not enter the inside of the cabin, and only a small amount of air enters and exits due to the respiration during cooling, and the inside of the cabin is not polluted.
[0069]
Furthermore, in the present embodiment, dust and moisture mixed in the outside air are subjected to the action of being shaken off to the outer peripheral side by the rotation of the ventilation fans 26 and 27, so that the back space of the ventilation fans 26 and 27 flows backward and the minute gap No dust or moisture reaches the part and does not enter the machine.
[0070]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the fully closed electric motor for driving a vehicle according to the second embodiment, a first bracket 29 and a second bracket 30 are attached to both sides of a cylindrical stator core 28 via a stator frame 20, respectively. Then, the first bearing 4 attached to the center of the first bracket 29 and the second bearing 5 attached to the center of the second bracket 30 via the bracket 23 on both sides of the rotor shaft 6. I support it.
[0071]
A rotor core 7 is attached to the center of the rotor shaft 6, and the rotor core 7 is provided with a plurality of ventilation holes 7a so as to penetrate in the axial direction. A plurality of first ventilation holes 28a, second ventilation holes 28b, and third ventilation holes 28c are provided on the outer peripheral side of the stator core 28, respectively.
[0072]
A first ventilation fan 26 and a second ventilation fan 27 are mounted on both sides of the rotor shaft 6 adjacent to the inside of each of the bearings 4 and 5. Further, a circulation fan 31 is attached to the rotor shaft 6 in the interior space separated from the outside by the shielding plates 24 and 25.
[0073]
A first outside air passage 29b, which is formed by a part of each of the first and second brackets 29 and 30, is provided on an outer peripheral portion of each of the first ventilation fan 26 and the second ventilation fan 27, and a second outside air. A ventilation passage 30a is formed.
[0074]
The first outside air passage 29b communicates with one end of the first air passage 28a via the introduction passage 29c, and the other end of the first air hole 28a is open to the atmosphere. On the other hand, the second outside air passage 30a communicates with one end of the second ventilation hole 28b via the introduction passage 30b, and the other end of the second ventilation hole 28b is open to the atmosphere.
[0075]
Both ends of the third ventilation hole 28c communicate with internal spaces on both sides of the stator core 28 by internal air flow passages 29d and 30c provided in brackets 29 and 30 on both sides, respectively.
[0076]
With respect to other components, the same reference numerals are given to components common to the first embodiment shown in FIGS. 1 to 4.
[0077]
Next, the operation of the vehicle drive fully-closed electric motor according to the second embodiment having the above configuration will be described. During operation of the motor, the rotation of the first ventilation fan 26 and the second ventilation fan 27 causes cooling outside air to flow through the first ventilation hole 28a and the second ventilation hole 28b of the stator core in opposite directions. To cool the motor. This function is the same as that described in the first embodiment.
[0078]
In the case of the second embodiment, further, rotation of the internal air circulation fan 31 causes air in the machine to flow from the internal air flow passage 30c into the third ventilation hole 28c of the stator core 28, and the third air hole 28c is removed. After passing through, the air flows into the internal space from the internal airflow passage 29d, passes through the ventilation hole 7a penetrating the rotor core 7, and returns to the inner peripheral side of the circulation fan 31.
[0079]
In this manner, in the vehicle drive fully-closed electric motor according to the second embodiment, the inside air circulates and is cooled when the heated inside air passes through the third ventilation hole 28c of the stator core 28. In addition, the cooling performance of each part in the machine is improved. Further, since the cooled inside air flows through the ventilation holes 7a of the rotor core 7, the cooling effect of the rotor is particularly improved.
[0080]
Next, a third embodiment of the present invention will be described with reference to FIG. The configuration of a fully closed electric motor for driving a vehicle according to the third embodiment is the same as that of the first embodiment shown in FIGS. 1 to 4, but in the present embodiment, the first embodiment is different from the first embodiment. A large number of heat-absorbing fins 33a are radially provided on the inside of the shield plate 33 corresponding to the shield plate 24, and a large number of heat-radiating fins 33b are radially provided on the outside of the machine (on the side of the ventilation fan 32). .
[0081]
Further, a plurality of blades 32b are radially provided on the back surface inside the ventilation fan 32 corresponding to the ventilation fan 26 of the first embodiment, and a plurality of ventilation holes 32c are provided in the inner diameter portion of the blade 33b.
[0082]
The operation of the vehicle drive fully-closed type electric motor of the third embodiment is the same as that of the first embodiment, but the outside air is further reduced by the rotation of the blades 32b on the back side of the ventilation fan 32. The air further flows into the space behind the ventilation fan 32 and flows through the radiation fins 33 b of the shielding plate 33. Further, the heat of the heated air inside the machine is effectively transmitted to the shield plate 33 by heat absorbing fins 33 a provided on the shield plate 33, and this heat is transmitted from the outer wall surface of the shield plate 33 and the many radiating fins 33 b. Since the air is released into the circulating outside air, the cooling of the air inside the machine is improved, and the temperature of each part inside the machine is reduced.
[0083]
Next, a fourth embodiment of the present invention will be described with reference to FIG. The configuration of the vehicle drive fully closed type electric motor according to the fourth embodiment is the same as that of the first embodiment shown in FIGS. 1 to 4, but in the present embodiment, the first embodiment A large number of heat absorbing fins 34b are provided on the inner wall of the bracket 34 corresponding to the bracket 21 of the first embodiment, and a large number of heat dissipating fins 34c are provided so as to protrude into the outside air passage 34a.
[0084]
Further, on the inner wall surface of the bracket 35 corresponding to the bracket 23 of the first embodiment, a number of heat absorbing fins 35b protruding into the in-machine space are provided, and a plurality of heat radiation fins 35c on the outer wall surface are provided.
[0085]
The operation of the fully closed electric motor for driving a vehicle according to the fourth embodiment is the same as that of the first embodiment, but the heat of the further heated air inside the machine is effectively achieved by the large number of heat absorbing fins 34b and 35b. Is transmitted to the brackets 34 and 35 and is cooled by the circulating cooling air. Further, the cooling effect of the brackets 34, 35 is increased by the radiation fins 34c, 35c provided in the outside air circulation portions 34a, 35a of the respective brackets 34, 35, so that the cooling performance of the air inside the machine is improved, and the temperature of each part in the machine is increased. The rise can be reduced.
[0086]
Next, a fifth embodiment of the present invention will be described with reference to FIG. The configuration of the vehicle drive fully-closed electric motor according to the fifth embodiment is the same as that of the first embodiment shown in FIGS. 1 to 4 except for the following.
[0087]
The first ventilation fan 36 corresponding to the first ventilation fan 26 of the first embodiment has its inner diameter side fixed to the rotor shaft 6 and at the same time in a state of being closely attached to the side surface of the rotor core retainer 40 in the axial direction. Installed.
[0088]
On the outside of the main plate of the first ventilation fan 36, a blade 36a for blowing cooling outside air is provided, and on the inside of the machine, a plurality of fins 36b are provided. An outer peripheral portion of the shielding plate 38 is fixed to the bracket 21, and an inner peripheral portion 38 a of the shielding plate 38 opposes an outer peripheral step surface provided on the main plate of the first ventilation fan 36 to form a minute gap on the circumference. are doing.
[0089]
The second ventilation fan 37 corresponding to the second ventilation fan 27 of the first embodiment has its inner diameter fixed to the rotor shaft 6 and is attached to the side surface of the rotor core retainer 41 at the same time.
[0090]
A blade 37a for blowing outside air is provided on the outer peripheral portion of the main plate of the second ventilation fan 37 on the outside of the machine, and a plurality of fins 37b are radially provided on the inner peripheral portion. The shielding plate 39 has an outer periphery fixed to the bracket 22, and an inner peripheral surface 39 a is opposed to an outer peripheral surface provided on the main plate of the second ventilation fan 37 to form a minute gap on the circumference.
[0091]
The operation of the fully closed electric motor for driving a vehicle according to the fifth embodiment is the same as that of the first embodiment, but the following operation is further added.
[0092]
Since the first ventilation fan 36 is attached in close contact with the rotor core retainer 40, the heat of the rotor core 7 is efficiently transmitted to the first ventilation fan 36, and the transmitted heat is transmitted to the outside air flowing from the blade 36a. And the cooling performance of the rotor is greatly improved. Further, the air in the cabin space is agitated by the many fins 36a, and at the same time, the heat of the air is efficiently transmitted to the ventilation fan 36 by the many fins 36b and released to the outside air from the blades 36a. The effect is also increased, and the temperature rise in each part in the machine can be reduced.
[0093]
Since the second ventilation fan 37 is also mounted in close contact with the rotor core retainer 41, the heat of the rotor core 7 is efficiently transmitted to the second ventilation fan 37, and the heat transmitted to the ventilation fan 37 is transmitted from the blades 37a. It is strongly discharged into the outside air, and the cooling performance of the rotor is greatly improved. Further, the transmitted heat is released to the outside air by the fins 37b provided on the outside air circulation side of the ventilation fan 36, so that the cooling performance of the rotor is further improved.
[0094]
If the ventilation fans 36 and 37 are made of an aluminum alloy or the like having excellent heat transfer properties, the heat radiation performance can be further improved and the rise in the temperature of the rotor can be further reduced.
[0095]
Next, a sixth embodiment of the present invention will be described with reference to FIG. The vehicle drive fully-closed electric motor according to the sixth embodiment has the same configuration as the vehicle drive fully-closed electric motor according to the fifth embodiment shown in FIG. 9, but differs in the following points.
[0096]
A plurality of ventilation holes 7a are provided in the vicinity of the inner peripheral side of the rotor core 7 so as to penetrate in the axial direction, and ventilation holes 40a, 41a are provided in rotor core holders 40, 41 on both sides of the rotor core 7, respectively. Then, the first ventilation fan 42 and the second ventilation fan 43 are attached in a state of being closely attached to the rotor core holders 40 and 41 in the axial direction, and a first shielding plate is provided on an inner wall surface of the first ventilation fan 42. A plurality of fins 42a are radially provided in a range of a diameter smaller than the diameter of the inner peripheral surface 38a of 38.
[0097]
In the operation of the vehicle drive fully-closed electric motor according to the sixth embodiment, the inner peripheral surface of the stator core 19 and the rotor are rotated after the air inside the machine is blown up to the outer peripheral side by the fan action of the fins 42 during rotation. After passing through the gap 44 on the outer peripheral surface of the iron core 7 in the axial direction, the air passes through the ventilation hole 7a near the inner circumference of the rotor core 7 from the inside space on the opposite side, and returns to the fin 42a of the first ventilation fan 42. Circulate in the route.
[0098]
When the outside air flows outside the first ventilation fan 42, the first ventilation fan 42 is cooled by the outside air, and the fin 42a provided on the inside wall surface of the cooled first ventilation fan 42 is provided. Is also cooled, so that the air circulating in the machine is cooled when passing through the fins 42a. The cooled circulating air in the machine flows through the gap surface 44 on the outer peripheral surface of the rotor where the temperature is highest, so that the cooling performance of the rotor is improved and the rise in the temperature of the rotor can be reduced.
[0099]
Further, the cooled in-machine air also circulates and circulates through the portions of the stator core 19 and the stator coil 11, so that the temperature rise of each portion in the machine can be further reduced.
[0100]
Next, a seventh embodiment of the present invention will be described with reference to FIG. The vehicle drive fully-closed electric motor according to the seventh embodiment has the same configuration as that of the fifth embodiment shown in FIG. 9 except for the following points.
[0101]
A plurality of ventilation holes 7a are provided near the inner peripheral side of the rotor core 7 so as to penetrate in the axial direction, and ventilation holes 40a, 41a are provided in the rotor core holders 40, 41 on both sides of the rotor core 7, respectively. Further, a first ventilation fan 45 and a second ventilation fan 46 are attached in a state of being in close contact with the rotor core holders 40 and 41, respectively, in the vicinity of the inner peripheral side of the first ventilation fan 45 and the second ventilation fan 46. Are provided with ventilation holes 45a and 46a, respectively. The positions of the ventilation holes 7a, the ventilation holes 40a, 41a, and the ventilation holes 45a, 46a are made coincident, and as a whole, the outside air circulation spaces on both sides of the electric motor are communicated. Further, a plurality of fins 46b are radially provided at an outlet portion outside the ventilation hole 46a of the second ventilation fan 46.
[0102]
In the operation of the vehicle drive fully closed type electric motor according to the seventh embodiment, when the electric motor rotates, the fan action of the fins 46b causes the ventilation hole of the rotor core 7 to move from the outside air circulation space outside the first ventilation fan 45. Outside air flows into the outside air circulation space outside the second ventilation fan 46 through 7a.
[0103]
Thereby, since the cooling outside air flows through the ventilation holes 7a in the rotor core 7, the cooling performance of the rotor is improved, and a rise in the temperature of the rotor can be reduced.
[0104]
If a difference is provided in the ventilation capacity between the first ventilation fan 45 and the second ventilation fan 46, the difference in the ventilation capacity allows the outside air to flow reliably to the ventilation holes 7 a in the rotor core 7. In that case, the fins 46b of the second ventilation fan 46 need not necessarily be provided.
[0105]
【The invention's effect】
As described above, according to the fully closed electric motor for driving a vehicle of the present invention, since the cooling outside air does not flow through the inside space of the machine, it is possible to prevent the inside of the machine from being contaminated by dust, and at the same time, to reduce the temperature rise of the bearing portion. By reducing the length, the life of the lubricating grease can be extended, the disassembly cycle of the electric motor can be lengthened, and maintenance can be saved.
[0106]
Further, the noise of the ventilation fan is reduced, and the noise of the electric motor can be reduced. In addition, since local heat inside the motor can be prevented and the overall cooling performance can be improved, a motor having the same capacity (output) as the conventional motor can be reduced in size and weight, and a motor of the same size as the conventional motor can be obtained. If so, the capacity (output) can be increased.
[Brief description of the drawings]
FIG. 1 is a front view of a fully-closed motor for driving a vehicle according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line AO in FIG.
FIG. 3 is a sectional view taken along line BO in FIG. 1;
FIG. 4 is a sectional view taken along line CC in FIG. 2;
FIG. 5 is a sectional view of a fully-closed electric motor for driving a vehicle according to a second embodiment of the present invention.
FIG. 6 is a sectional view taken along line DD in FIG. 5;
FIG. 7 is a sectional view of a fully-closed electric motor for driving a vehicle according to a third embodiment of the present invention.
FIG. 8 is a sectional view of a vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention.
FIG. 9 is a sectional view of a fully-closed electric motor for driving a vehicle according to a fifth embodiment of the present invention.
FIG. 10 is a cross-sectional view of a vehicle drive fully closed electric motor according to a sixth embodiment of the present invention.
FIG. 11 is a sectional view of a vehicle drive fully-closed electric motor according to a seventh embodiment of the present invention.
FIG. 12 is a sectional view of a conventional open self-venting electric motor for driving a vehicle.
FIG. 13 is a cross-sectional view of a conventionally proposed fully-closed motor for driving a vehicle.
[Explanation of symbols]
4 First bearing
5 Second bearing
6 rotor shaft
7 rotor core
7a ventilation hole
8 Rotor bar
11 Stator coil
19 Stator core
19a First ventilation hole
19b Second ventilation hole
20 Stator frame
20a Stator arm
21 Bracket
21a inlet
21b 1st open air passage
21c introduction route
22 Bracket
22a Second open air passage
22b Introductory route
23 Bracket
23a inlet
24 Shield plate
25 Shield plate
26 First ventilation fan
26a feather
27 Second ventilation fan
27a feather
28 Stator iron core
28a First ventilation hole
28b Second ventilation hole
28c Third ventilation hole
29 bracket
29a inlet
29b 1st outside air inflow path
29c introduction route
29d Internal air flow passage
30 bracket
30a Second open air passage
30b introduction route
30c Internal air flow passage
31 Circulation fan
32 Ventilation fan
32a feather
32b fin
32c ventilation hole
33 Shield plate
33a Endothermic fin
33b radiation fin
34 bracket
34a Open air ventilation path
34b heat absorbing fin
34c radiation fin
35 bracket
35a Open air passage
35b Endothermic fin
35c radiation fin
36 First ventilation fan
36a feather
36b fin
37 Second ventilation fan
37a feather
37b fin
38 Shield plate
39 Shield plate
40 Rotor iron core foot
40a ventilation hole
41 Rotor core presser
41a ventilation hole
42 First ventilation fan
42a fin
43 Second ventilation fan
44 Gap on circumference
45 First ventilation fan
45a ventilation hole
45b fin
46 Second ventilation fan
46a ventilation hole
46b fin
50 bogie frame
51 wheels

Claims (8)

Place the rotor core on the inner circumference side of the stator core,
A rotor shaft is coupled to the center of the rotor core,
A first bracket containing a first bearing is attached to one axial end of the stator core, and a second bracket containing a second bearing is attached to the other axial end of the stator core. Mounting,
The rotor shaft is supported by first and second bearings built in the first and second brackets, respectively.
At one end of the rotor shaft, a first ventilation fan is attached so as to be adjacent to the inside of the first bearing,
An outer peripheral portion of the first shielding plate is fixed to the first bracket, and an inner peripheral side of the first shielding plate is arranged so as to form a minute gap on the circumference facing the rotor shaft, Partitioning the space accommodating the first ventilation fan and the in-machine space,
A second ventilation fan is attached to the other end side of the rotor shaft so as to be adjacent to the inside of the second bearing unit,
An outer peripheral portion of a second shielding plate is fixed to the second bracket, and an inner peripheral side of the second shielding plate is arranged so as to face the rotor shaft so as to form a minute gap on a circumference, Partitioning the space accommodating the second ventilation fan and the in-machine space,
A plurality of first ventilation holes and a plurality of second ventilation holes are respectively formed near the outer periphery of the stator core so as to penetrate in the axial direction,
A plurality of air inlets are provided on a side of the first bracket on a portion closer to the inner diameter side than the blade position of the first ventilation fan,
An outer peripheral portion of the first bracket is provided with a first outside air passage for receiving cooling air from the first ventilation fan, and the first outside air passage is communicated with one end of the first ventilation hole. The other end of the first ventilation hole is open to the atmosphere,
A plurality of air inlets are provided on a side surface of the second bracket on an inner diameter side of a blade position of the second ventilation fan, and cooling is performed on an outer peripheral portion of the second bracket by the second ventilation fan. A second outside air passage for receiving wind, the second outside air passage communicating with one end of the second ventilation hole, and the other end of the second ventilation hole being open to the atmosphere. A fully-closed electric motor for driving vehicles. Place the rotor core on the inner circumference side of the stator core,
A rotor shaft is coupled to the center of the rotor core,
A first bracket containing a first bearing is attached to one axial end of the stator core, and a second bracket containing a second bearing is attached to the other axial end of the stator core. Mounting,
The rotor shaft is supported by first and second bearings built in the first and second brackets, respectively.
At one end of the rotor shaft, a first ventilation fan is attached so as to be adjacent to the inside of the first bearing,
An outer peripheral portion of the first shielding plate is fixed to the first bracket, and an inner peripheral side of the first shielding plate is arranged so as to form a minute gap on the circumference facing the rotor shaft, Partitioning the space accommodating the first ventilation fan and the in-machine space,
A second ventilation fan is attached to the other end side of the rotor shaft so as to be adjacent to the inside of the second bearing unit,
An outer peripheral portion of a second shielding plate is fixed to the second bracket, and an inner peripheral side of the second shielding plate is arranged so as to face the rotor shaft so as to form a minute gap on a circumference, Partitioning the space accommodating the second ventilation fan and the in-machine space,
A circulating fan is attached to the rotor shaft in an in-machine space partitioned by the first shielding plate or the second shielding plate,
A plurality of first ventilation holes, a second ventilation hole, and a third ventilation hole are respectively formed near the outer periphery of the stator core so as to penetrate in the axial direction;
A plurality of air inlets are provided on a side of the first bracket on a portion closer to the inner diameter side than the blade position of the first ventilation fan,
An outer peripheral portion of the first bracket is provided with a first outside air passage for receiving cooling air from the first ventilation fan, and the first outside air passage is communicated with one end of the first ventilation hole. The other end of the first ventilation hole is open to the atmosphere,
A plurality of air inlets are provided on a side surface of the second bracket on an inner diameter side of a blade position of the second ventilation fan, and cooling is performed on an outer peripheral portion of the second bracket by the second ventilation fan. A second outside air passage for receiving wind is provided, the second outside air passage is communicated with one end of the second ventilation hole, and the other end of the second ventilation hole is open to the atmosphere;
By connecting both open ends of the third ventilation hole to the in-machine space through respective internal air flow passages provided in the first and second brackets, the third ventilation hole rotates the circulation fan. A fully-closed electric motor for driving a vehicle, characterized in that the ventilation passage of the in-machine circulating air generated by the motor is used. A plurality of fins are radially provided on the back surface of one or both of the first and second ventilation fans, and a plurality of ventilation holes penetrating to the back side are provided on the inner diameter side from the fin position of the ventilation fan, A plurality of heat absorbing fins are provided on one or both inner wall surfaces of the first and second shield plates, and a plurality of heat dissipating fins are radially provided on the back side of one or both of the first and second ventilation fans. 3. The fully-closed electric motor for driving a vehicle according to claim 1, wherein a plurality of the electric motors are provided. A plurality of heat absorbing fins are provided on one or both inner walls of the first and second brackets, and a large number of heat dissipating fins are provided on both or any one of the wall and the outer wall in the outside air passage. The fully closed electric motor for driving a vehicle according to any one of claims 1 to 3. One or both inside ends of the first and second ventilation fans are closely attached to the side surfaces of the rotor core, and one or both of the first and second ventilation fans are attached. A large number of cooling fins are provided on both or one of the surface in contact with the internal space and the surface in contact with the outside air circulation space,
One or both of the inner peripheral portions of the first and second shielding plates are opposed to an outer peripheral step surface provided on a part of one or both of the first and second ventilation fans to form a circumference. 5. The fully-closed electric motor for driving a vehicle according to claim 1, wherein an upper minute gap is formed. The number of blades of the first ventilation fan and the number of blades of the second ventilation fan are different, and the number of blades of both ventilation fans is set to a value that is not divisible by the number of each other. 6. The fully-closed electric motor for driving a vehicle according to any one of 5. A plurality of ventilation holes are provided in the vicinity of the inner peripheral side of the rotor core and the rotor core retainers disposed on both sides of the rotor core so as to penetrate in the axial direction, respectively, so that the in-machine space on both sides of the rotor core is provided. Communicated by air holes,
On the inner wall surface of the first ventilation fan, a plurality of fins are radially provided on a portion closer to the center than a minute gap portion on a circumference formed between the first ventilation plate and the first shielding plate,
During rotation of the rotor core, the fan action of the plurality of fins causes a circumferential gap between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor core and a ventilation hole near the inner peripheral side of the rotor core. 6. The fully-closed electric motor for driving a vehicle according to claim 5, wherein air in the machine is circulated in a route that passes through. A plurality of axially penetrating portions near the inner peripheral side of the rotor core, rotor core retainers disposed on both sides of the rotor core, and the respective inner peripheral sides of the first ventilation fan and the second ventilation fan. 6. The fully closed motor for driving a vehicle according to claim 5, wherein the ventilation holes are provided, and the external spaces on both sides of the motor are communicated with the ventilation holes.

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