JP2004080888A - Totally-closed type motor for driving vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate pollution inside a motor, and provide noise reduction in a ventilation fan, long exchange cycle of lubrication grease of a bearing portion, and the size and weight reductions or high output. <P>SOLUTION: In a totally-closed type driving motor, in which a rotor core 7 is disposed on the inner-periphery side of a cylindrical stator core 19; brackets 20, 21 are fixed at both ends of the stator core; and both the ends of a rotor shaft 6 are supported by bearings 4, 5 attached onto the brackets; and the plurality of first ventilation holes 19a and the plurality of second ventilation holes 19b, piercing through in a longitudinal direction are respectively provided on the outer peripheral side of the stator core. A first ventilation fan 24 and a second ventilation fan 25 are provided on both ends on the outside of the rotor shaft, ventilation passages 20a, 21a, communicating with the first ventilation holes and the second ventilation holes of the stator core respectively are provided at the brackets at an outer-periphery side part of the ventilation fan. The outside air supplied by the respective ventilation fans is discharged to the outside of the motor after mutually passing through the first ventilation holes and the second ventilation holes of the stator core in a reverse direction. <P>COPYRIGHT: (C)2004,JPO

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 train, a vehicle driving motor is loaded on a bogie arranged below a vehicle body, and the rotational force of the motor is transmitted to wheels via a gear device so that the vehicle travels. Conventionally, this kind of vehicle driving motor has a structure shown in FIG.
[0003]
The conventional motor for driving a vehicle shown in FIG. 10 has a cylindrical frame 1 as a fixed-side 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. Are mounted, 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 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 (coupling) 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 electric motor shown in FIG. 10 has a mounting arm portion provided on the frame 1 fastened and fixed to a bogie frame by bolts, and the rotational force of the electric 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 vehicle drive system shown in FIG. 10, the outside air taken into the electric motor is cleaned by capturing dust with the filter 12a of the ventilation filter 12, but by continuing the operation, Since the filter 12a gradually becomes clogged and the amount of air flow inside the machine decreases, 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. 11 shows the structure of the fully enclosed fan-cooled 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 opposite side to the drive protrudes outside the machine, and a ventilation fan 15 is attached to the protruding portion.
[0015]
A large number of cooling fins 13 a extending in the axial direction are provided on the outer peripheral surface of the frame 13, and a cover 16 is placed so as to cover the cooling fins 13 a, and a shaft surrounded by the inside of the cover 16 and the outside of the frame 13. The space extending in the direction is 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 1 is attached to the non-drive end of the electric motor, and an outside air intake 18a for the ventilation fan 15 is formed in the center of the cover.
[0017]
The fully enclosed external fan cooling type electric motor shown in FIG. 11 is a fully enclosed type in which the inside of the electric 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. 11 does not require a filter, thus making it possible to save labor. However, there is a technical problem described below, and improvement has been desired.
[0020]
First, the heat radiation performance is low because the cooling of the heat generating portion in the machine is performed indirectly by the cooling fins 13 a via the frame 13. Therefore, in order to obtain the cooling performance like the conventional motor shown in FIG. 10, 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 of an increase in temperature rise of the bearing. Since the bearing is lubricated by the lubricating grease filled in the bearing portion, if the temperature rise of the bearing portion 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 driving 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 driving side bearing 4 rises. Increase significantly. In vehicle drive motors, while the progress of grease renewal cycles is being extended to save maintenance, lubricating grease deteriorates faster due to the increase in the temperature rise of bearings, and grease replacement is required early. Is a technical problem, and improvement was 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 enclosed 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 on 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 on the side located on the exhaust side of the internal stator coil and the rotor bar 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, there has been a demand for a fully-closed vehicle drive motor that eliminates local heat and has good heat dissipation performance.
[0023]
SUMMARY OF THE INVENTION The present invention relates to a conventionally proposed fully-closed motor for driving a vehicle, which eliminates contamination inside the machine, reduces noise of a ventilation fan for cooling, and reduces lubrication by reducing a rise in temperature of a bearing portion. It is an object of the present invention to provide a fully-closed motor for driving a vehicle, which can reduce the size and weight or increase the capacity (output) by extending the grease replacement cycle and further improving cooling performance and eliminating local heat.
[0024]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a fully-closed motor for driving a vehicle, wherein a rotor core is disposed on an inner peripheral side of a stator core, and a first bearing is incorporated at one axial end of the stator core. A bracket is attached, a second bracket containing a second bearing is attached to the other axial end of the stator core, and the rotor shaft connected to the inner peripheral portion of the rotor core is attached to the first and second rotor cores. And a first ventilation fan attached to one end of the rotor shaft outside the machine, and a second ventilation fan attached to the other end of the rotor shaft outside the machine. A ventilation fan is mounted, a plurality of first ventilation holes and a plurality of second ventilation holes are formed near the outer periphery of the stator core so as to penetrate in the axial direction, and the first ventilation hole is formed on an outer portion of the first bracket. Receiving cooling air from the ventilation fan A first outside air ventilation path is provided, the first outside air ventilation path is communicated with one end of the first ventilation hole, the other end of the first ventilation hole is open to the atmosphere, and the second A second outside air passage for receiving cooling air from the second ventilation fan is provided on an outer portion of the bracket, and the second outside air passage is communicated with one end of the second ventilation hole. The other end of the ventilation hole is open to the atmosphere.
[0025]
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. Furthermore, the outside air is circulated by the ventilation fans on both sides to cool the entire motor in a well-balanced manner, eliminating local heat, and at the same time, cooling the brackets on both sides efficiently with the circulated outside air to improve the cooling performance of the entire motor As a result, the size and weight of the electric motor or the capacity thereof is increased.
[0026]
According to a second aspect of the present invention, there is provided a fully-closed motor for driving a vehicle, wherein a rotor core is arranged on an inner peripheral side of a stator core, and a first bearing is built in one axial end of the stator core. A bracket is attached, a second bracket containing a second bearing is attached to the other axial end of the stator core, and the rotor shaft connected to the inner peripheral portion of the rotor core is attached to the first and second rotor cores. And a first ventilation fan attached to one end of the rotor shaft outside the machine, and a second ventilation fan attached to the other end of the rotor shaft outside the machine. A ventilation fan is mounted, a circulation fan is mounted inside the rotor shaft machine, and a plurality of first, second, and third ventilation holes are formed near the outer periphery of the stator core so as to penetrate in the axial direction. Outside the first bracket A first outside air passage for receiving cooling air from the first ventilation fan, the first outside air passage communicating with one end of the first ventilation hole, The other end is open to the atmosphere, and a second outside air passage for receiving cooling air from the second ventilation fan is provided outside the second bracket, and the second outside air passage is connected to the second outside air passage. The other end of the second ventilation hole is open to the atmosphere, and both open ends of the third ventilation hole are covered from the outside by the first and second brackets. Accordingly, the third ventilation hole is formed as a passage for the circulating cooling air in the machine generated by the rotation of the circulating fan.
[0027]
In the fully closed 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 portion of the stator core in addition to the structure of the first aspect of the present invention, and the third core further penetrates the rotor core in the axial direction. By providing a plurality of ventilation holes, communicating both ends of a third ventilation hole added to the stator core with the internal space, and providing an internal air circulation fan on a rotor shaft in the machine, the internal air circulation fan rotates during operation to rotate the internal air. Is circulated through the third ventilation hole of the stator core and the ventilation hole of the rotor core to cool the stator core. Thereby, the cooling performance inside the machine is improved, and in particular, the rise in the temperature of the rotor is reduced.
[0028]
According to a third aspect of the present invention, in the fully closed motor for driving a vehicle according to the first or second aspect, a plurality of cooling units are provided on one or both of the inner wall and the outer wall of the first and second brackets. The fins are provided radially, and the cooling fins improve the cooling performance of the air in the machine and reduce the temperature rise in various parts in the machine.
[0029]
According to a fourth aspect of the present invention, in the fully closed electric motor for driving a vehicle according to any of the first to third aspects, a plurality of fins are radially provided on an inner surface of a main plate of each of the first and second ventilation fans. A plurality of auxiliary ventilation holes are provided so as to penetrate in the axial direction at a position closer to the center than the positions of the fins in the above, and cooling outside air is rotated near the bearing by rotation of the ventilation fan during operation. To further reduce the temperature rise of the bearing.
[0030]
A fully-closed motor for driving a vehicle according to claim 5, wherein a stator core is mounted on an inner peripheral side of a cylindrical frame, a rotor core is arranged on an inner peripheral side of the stator core, and both ends in the axial direction of the frame. A bearing is attached to each of the fixing members provided on the shaft, and each of the bearings supports both ends in the axial direction of the rotor shaft at the center of the rotor core, extends axially on the outer peripheral portion of the frame, and extends in the circumferential direction. A plurality of first ventilation paths and a plurality of second ventilation paths are formed, and a first ventilation fan is attached to one axial end of the outside of the rotor shaft. A second ventilation fan is attached to the other axial end on the outside of the machine, and a first introduction path for receiving cooling air from the first ventilation fan is formed at one axial end of the frame. The other in the axial direction of the frame At the end, a second introduction path for receiving cooling air from the second ventilation fan is formed, and the first introduction path is communicated with one end of the first ventilation path, and the first ventilation path is provided. To the atmosphere, the second introduction path communicates with one end of the second ventilation path, and the other end of the second ventilation path is released to the atmosphere, In each of the two ventilation passages, a number of cooling fins are provided on the outer peripheral surface of the frame so as to extend in the axial direction.
[0031]
In the fully closed electric motor for driving a vehicle according to the fifth aspect of the present invention, the outside air is circulated by the two ventilation fans on both ends, so that the air volume of each ventilation fan is reduced by half so that the size and diameter of the ventilation fan are reduced. To reduce the noise during operation of the ventilation fan. In addition, cooling of the bearings on both sides is equivalently performed by flowing outside air from both sides along the outer peripheral portion of the frame by the ventilation fans on both sides, avoiding the temperature rise of only one bearing and increasing the temperature. Prevents rapid deterioration of lubricating grease. Furthermore, by circulating the outside air with the ventilation fans on both sides, the entire motor is cooled in a well-balanced manner, eliminating the generation of local heat, and at the same time, the frame itself is efficiently cooled with the circulating outside air to improve the cooling performance of the entire motor. In addition, the size and weight of the motor are reduced or the capacity is increased.
[0032]
According to a sixth aspect of the present invention, in the fully closed motor for driving a vehicle according to the fifth aspect, a plurality of fins are radially provided on an inner surface of one or both main plates of the first and second ventilation fans. A plurality of auxiliary ventilation holes are provided in a portion of the main plate closer to the center than the positions of the fins so as to penetrate in the axial direction. In the space near the bearing to further reduce the temperature rise of the bearing.
[0033]
According to a seventh aspect of the present invention, in the fully closed electric motor for driving a vehicle according to any of the first to sixth aspects, the first ventilation fan and the second ventilation fan have different numbers of blades, and the blades of the two ventilation fans are different. The feature is that the number of sheets is set to a value that is not divisible by each other, and the noise frequency due to the interference of both noise frequencies is caused by making the noise frequency of the blades of both ventilation fans generated during rotation different. And eliminate the increase in overall noise.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 3 to 1 show the configuration of the 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 through the stator frame 19 c. Then, the first bracket 20 containing the first bearing 4 is attached, and the second bracket 21 containing the second bearing 5 is also provided at the other axial end of the stator core 19 via the stator frame 19c. Is installed. The second bearing 5 is attached to the center of the second bracket 21 via the housing 3.
[0035]
A rotor shaft 6 is connected to an inner peripheral portion of the rotor core 7, and both ends in the axial direction of the rotor shaft 6 are respectively attached to first and second bearings 4 and 4 built in first and second brackets 20 and 21. 5 supported by each. A first ventilation fan 24 is attached to one end of the rotor shaft 6 on the outside of the machine, and a second ventilation fan 25 is attached to the other end.
[0036]
A large number of grooves are provided on the outer peripheral portion of the rotor core 7, and the rotor bar 8 is accommodated in the grooves. Both ends of each rotor bar 8 are extended beyond the rotor core 7 and are bound and integrated by an end ring to form a cage rotor of the induction motor.
[0037]
A number of grooves are provided in the inner peripheral portion 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 to protrude from the stator core 19.
[0038]
As shown in detail in FIG. 1, 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. As shown in detail in FIG. 2, a first outside air passage 20 a that receives cooling air from the first ventilation fan 24 is provided in the outer portion of the first bracket 20 in a circumferential shape, and the first outside air passage is provided. 20a is communicated with one end of the first ventilation hole 19a via an introduction path 20b. The other end of the first ventilation hole 19a is open to the atmosphere by a ventilation hole 21c.
[0039]
As shown in detail in FIG. 3, a second outside air ventilation passage 21 a that receives cooling air from the second ventilation fan 25 is provided in the outer portion of the second bracket 21 in a circumferential shape, and the second outside air ventilation passage is provided. 21a is communicated with one end of the second ventilation hole 19b via an introduction path 21b. The other end of the second ventilation hole 19b is open to the atmosphere by the exhaust hole 20c.
[0040]
Each of the first and second ventilation fans 24 and 25 has a plurality of radially arranged blades 24a and 25a, respectively. The number of blades of the first ventilation fan 24 and the number of blades of the second ventilation fan 25 are set to different numbers, for example, 15:17, and are set to numbers that are indivisible.
[0041]
Cooling fins 20d and 21d are provided in the vicinity of the exhaust holes 20c and 21c of the first bracket 20 and the second bracket 21 so as to extend in the exhaust air direction.
[0042]
A ring-shaped cover 22 is attached to the outer side surface of the first ventilation fan 24, and an inner peripheral opening of the cover 22 is used as an inlet 22 a for cooling outside air. A disk-shaped cover 23 is attached to the side surface of the second ventilation fan 25, and an air inlet 23a formed by a plurality of punched small holes is provided at the center of the cover 23.
[0043]
As shown in detail in FIG. 1, the entire electric motor is loaded in the bogie by fixing a portion of a stator arm 19d provided integrally with the stator frame 19c to a bogie frame with bolts. As shown in FIGS. 2 and 3, the rotor shaft end 6a protruding from one end of the motor is connected to the drive gear device via a joint, and the torque of the motor is transmitted from the drive gear device to the wheels. To run the vehicle.
[0044]
Next, the operation of the vehicle drive fully-closed electric motor having the above configuration will be described. As shown in FIG. 2, when the electric motor is operating, the outside air flows in from the air inlet 22a by the rotation of the first ventilation fan 24. The inflowing outside air flows from the first ventilation path 20a to the first ventilation hole 19a via the introduction path 20b, and is discharged to the atmosphere side from the ventilation hole 21c.
[0045]
As shown in detail in FIG. 3, at the same time, the outside air flows in from the air inlet 23a by the rotation of the second ventilation fan 25. The inflowing outside air flows from the second ventilation passage 21a to the second ventilation hole 19b via the introduction passage 21b, and is discharged to the atmosphere side from the exhaust hole 20c.
[0046]
As described above, in the electric motor according to the first embodiment, the cooling outside air is supplied to the outer surfaces of the brackets 20 and 21 by the ventilation fans 24 and 25 provided at both ends in the axial direction, and the large number of ventilation holes 19 a and Since the cooling is performed by flowing through the inside of the motor 19b, the cooling area and the heat radiation area of the entire electric motor are increased, and the cooling performance is improved. In particular, the temperature of the stator core 19 tends to be higher than that of other parts because the heat of the stator coil 11 mounted on the inner peripheral side thereof is directly transmitted. Cooling outside air flows through the ventilation holes 19a and 19b, so that cooling can be performed effectively and a rise in temperature can be suppressed.
[0047]
Further, in the electric motor of the present embodiment, since the cooling outside air is evenly circulated and cooled by the ventilation fans 24 and 25 on both sides of the electric motor, local heat (local heating) of the internal stator coil 11 and the rotor bar 8 is generated. Disappears.
[0048]
Further, in the electric motor according to the present embodiment, since the cooling outside air flows through the outer surfaces of both brackets 20 and 21, both brackets 20 and 21 and bearings 4 and 5 are cooled in the same manner, and brackets 20 and 21 are also cooled. As a result, the temperature rise of the bearings 4 and 5 is reduced.
[0049]
Furthermore, in the electric motor according to the present embodiment, the ventilation fans 24 and 25 mounted adjacent to both the bearings 4 and 5 also function as powerful radiators, so that the heat of the bearings 4 and 5 is effectively applied to the outside air. And contributes to further reduction in temperature rise of the bearings 4 and 5.
[0050]
In addition, the electric motor of the present embodiment has a structure in which the ventilation fans 24 and 25 are dispersed and cooled on both sides of the electric motor, so that even if the cooling air volume of one of the ventilation fans is reduced by half, the cooling can be effectively performed. The ventilation fans 24 and 25 can be reduced in size and diameter, the noise of the ventilation fans 24 and 25 during operation decreases, and the noise of the motor as a whole, which combines the noise from both ventilation fans, can be reduced. By setting the number of blades of the first ventilation fan 24 and the number of blades of the second ventilation fan 25 to different numbers and values that are not divisible by each other, the noise frequency of the two ventilation fans 24 and 25 during rotation is increased. Can be prevented from increasing, and the noise can be reduced from this point as well.
[0051]
Next, a fully-closed motor for driving a vehicle according to a second embodiment of the present invention will be described with reference to FIGS. In the fully-closed motor for driving a vehicle according to the second embodiment, a first bracket 27 and a second bracket 28 are attached to both sides of a cylindrical stator core 26 via stator frames 26d, respectively. A first bearing 4 and a second bearing 5 attached to the respective center portions support both sides of the rotor shaft 6.
[0052]
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 penetrating in the axial direction. A plurality of first ventilation holes 26a, second ventilation holes 26b, and third ventilation holes 26c are provided on the outer peripheral side of the stator core 26, respectively.
[0053]
An internal air circulation fan 39 is attached to an inner portion of the rotor shaft 6. A first ventilation fan 24 and a second ventilation fan 25 are attached to both ends on the outer side of the rotor shaft, respectively, and a part of a bracket 27, 28 is provided on the outer periphery of the ventilation fans 24, 25, respectively. The first ventilation path 27a and the second ventilation path 28a that are configured are formed.
[0054]
The first ventilation path 27a communicates with a first ventilation hole 26a provided in the stator core 26 via an introduction path 27b. One end of the first ventilation hole 26a is open to the atmosphere via a ventilation hole 28c of the bracket 28. On the other hand, the second ventilation path 28a communicates with the second ventilation hole 26b of the stator core 26 via the introduction path 28b. One end of the second ventilation hole 26b is open to the atmosphere via a ventilation hole of the bracket 27.
[0055]
A third ventilation hole 26c formed near the outer peripheral portion of the stator core 26 is formed in the in-machine space on both sides of the stator core 26 by the inside air introduction passage 27d and the inside air inflow passage 28d provided in the brackets 27 and 28 on both sides. Each is in communication.
[0056]
With respect to other components, the same reference numerals are given to components common to the first embodiment shown in FIGS. 1 to 3.
[0057]
Next, a cooling operation during 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 24 and the second ventilation fan 25 causes cooling outside air to flow through the first ventilation hole 26a and the second ventilation hole 26b of the stator core in opposite directions. , To cool the motor. This function is the same as the content described in the first embodiment.
[0058]
In the case of the second embodiment, further, the rotation of the internal air circulation fan 39 causes air in the machine to flow from the internal air introduction passage 27d on the drive side into the third ventilation hole 26c of the stator core 26, and After passing through the air hole 26c, the air flows into the machine from the inside air passage 28d on the non-drive side, passes through the air hole 7a passing through the rotor core 7, and returns to the inner peripheral side of the circulation fan 39.
[0059]
In this manner, in the fully-closed electric motor for driving a vehicle according to the second embodiment, the inside air circulates through the inside of the machine, so that the heated inside air passes through the third ventilation hole 26c of the stator core 26 when the stator core 26, the cooling function in the machine is improved. Further, on the outer peripheral side of the stator core 26, since the outside air is circulating in the first ventilation hole 26a and the second ventilation hole 26b and the temperature thereof is lowered, the inside air passes through the third ventilation hole 26c. When passing through, the effect of cooling the inside air by the heat exchange effect is great, and therefore, the cooling inside the machine, particularly the cooling of the rotor can be effectively performed.
[0060]
Next, a fully-closed electric motor for driving a vehicle according to a third embodiment of the present invention will be described with reference to FIG. The configuration of the fully-closed electric motor according to the present embodiment is the same as that of the first embodiment shown in FIGS. 1 to 3, but in the present embodiment, a large number of inner and outer walls of the bracket 29 and the bracket 30 are provided. It is characterized in that the cooling fins 29a, 29b and 30a, 30b are provided in a nearly radial state. In FIG. 6, 29c is a first ventilation path, 29d is an introduction path, 30c is a second ventilation path, and 30d is an introduction path.
[0061]
The vehicle drive fully-closed electric motor according to the third embodiment operates in the same manner as the first embodiment, except that the rotation of the first ventilation fan 24 and the second ventilation fan 25 causes the cooling outside air to flow through the bracket 29. Since the cooling area is increased by the fins 29b and 30b when flowing through the outer surface portions of the fins 30 and 30, the cooling performance is high.
[0062]
Further, the fins 29a and 30a on the inner side of the brackets 29 and 30 function as heat absorbing fins, and the fins 29b and 30b on the outer side of the brackets 29 and 30 function as heat dissipating fins. The effect is further improved, and the temperature rise of the electric motor can be further reduced.
[0063]
Next, a fully-closed electric motor for driving a vehicle according to a fourth embodiment of the present invention will be described with reference to FIG. The fully-closed electric motor according to the present embodiment is different from the third embodiment shown in FIG. 6 in that a plurality of fins 31 a are provided on the back surface of the main plate of at least one ventilation fan, here, the second ventilation fan 31. A plurality of ventilation holes 31b are provided in a portion closer to the center of the ventilation fan 31 than the fins 31a. Other configurations are almost the same as those of the third embodiment. However, as compared with the third embodiment, the shape of the fin 30a on the inboard side of the bracket on the ventilation fan side provided with the ventilation hole, here the bracket 30, is slightly changed, and the fin 30b on the outer surface side is The fins 31 a are formed on the ventilation fan 30 without being formed. The same configuration can be provided for the first ventilation fan on the opposite side.
[0064]
In the fully closed electric motor for driving a vehicle according to the fourth embodiment, rotation of the ventilation fan 31 during operation causes external air to flow into the back space of the ventilation fan 31 from the ventilation hole 31b, and the periphery of the bearing 5 is a member. Since the air flows through the surfaces of the housing 3 and the end lid 3a and flows into the ventilation passage 30c, the cooling of the bearing portion by the outside air is further improved, and the temperature rise of the bearing portion can be further reduced. In addition, it is possible to suppress an increase in the temperature of the lubricating grease filled in the bearing portion by effective cooling, and it is possible to further extend the deterioration life of the lubricating grease.
[0065]
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. In the fully-closed electric motor according to the present embodiment, a stator core 10 is mounted on the inner peripheral side of a thin, bottomed cylindrical frame 32, and a bearing 5 is mounted on one end of the frame 32 via a housing 3. A bearing 4 is attached to the other end of the rotor shaft 6 via a bracket 33, and both ends of the rotor shaft 6 are supported by the bearings 4 and 5. Further, a stator coil 11 is mounted on the inner peripheral side of the stator core 10, and a rotor core 7 is mounted on a central portion of the rotor shaft 6 in the axial direction. Ventilation fans 24 and 25 are attached to both ends of the rotor shaft 6 on the outside of the machine.
[0066]
A plurality of first ventilation paths 35 and a plurality of second ventilation paths 36 are provided on the outer peripheral portion of the frame 32 by a cover 34 and a partition 34a. In the first ventilation path 35 and the second ventilation path 36, there are a large number of radiation fins 32a provided integrally on the outer peripheral surface of the frame 32. Each of the radiation fins 32a extends in the axial direction of the frame 32 in the same manner as the direction of the ventilation passages 35 and 36.
[0067]
An introduction path 37 is formed on the outer peripheral side of the first ventilation fan 24, and this introduction path 37 is communicated with one end of the first ventilation path 35. The other end of the first ventilation path 35 is open to the atmosphere at the end of the frame. Further, an introduction path 38 is formed on the outer peripheral side of the second ventilation fan 25, and this introduction path 38 is connected to one end of the second ventilation path 36. The other end of the second ventilation path 36 is open to the atmosphere at the end of the frame 32.
[0068]
During the operation of the fully closed electric motor for driving a vehicle according to the present embodiment, the cooling outside air is sent to the introduction passage 37 by the rotation of the first ventilation fan 24, and then flows through the first ventilation passage 35 and is discharged outside. . At the same time, the cooling air is sent to the introduction path 38 by the rotation of the second ventilation fan 25, and then flows through the second ventilation path 36 and is discharged outside.
[0069]
As described above, the cooling outside air flows in the first ventilation path 35 and the second ventilation path 36 provided on the outer peripheral surface of the frame 32 in opposite directions to each other, and a large number of radiating fins arranged in the ventilation paths 35 and 36 are provided. Heat of the motor is released to the outside air from 32a to cool the motor.
[0070]
Also in the configuration of the fifth embodiment, similarly to the first embodiment, noise can be reduced by downsizing the ventilation fan, and the cooling effect can be improved and uniformized, and local heat can be eliminated. Further, the temperature rise of the bearing portion can be reduced by improving the cooling performance of the bearing portions 4 and 5, and the replacement life of the lubricating grease can be extended.
[0071]
【The invention's effect】
As described above, according to the fully-closed electric motor for driving a vehicle of the present invention, it is possible to prevent contamination of various parts in the machine by dust with a fully-closed cooling type, and at the same time, to reduce noise due to a reduction in noise of the ventilation fan, and to reduce bearing noise. By reducing the degree of temperature rise, the lubricating life of the lubricating grease is extended, maintenance can be saved, and local heat inside the motor can be prevented and the overall cooling performance can be improved. It is possible to reduce the size and weight, and it is possible to increase the output capacity of a motor having the same size as the conventional motor.
[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 of a fully-closed motor for driving a vehicle according to a second embodiment of the present invention.
FIG. 5 is a sectional view taken along line CC in FIG. 4;
FIG. 6 is a sectional view of a fully-closed motor for driving a vehicle according to a third embodiment of the present invention.
FIG. 7 is a sectional view of a fully-closed motor for driving a vehicle according to a fourth embodiment of the present invention.
FIG. 8 is a sectional view of a fully-closed motor for driving a vehicle according to a fifth embodiment of the present invention.
FIG. 9 is a sectional view taken along line DD in FIG. 8;
FIG. 10 is a sectional view of a conventional vehicle drive motor.
FIG. 11 is a cross-sectional view of a conventionally-closed fully-driven motor for driving a vehicle.
[Explanation of symbols]
3 Housing
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
19c Stator frame
19d stator arm
20,21 Bracket
20a First ventilation path
20b introduction route
20c exhaust hole
21a Second ventilation path
21b Introduction route
21c exhaust hole
22 Cover
22a inlet
23 Cover
23a inlet
24 First ventilation fan
25 Second ventilation fan
26 Stator core
26a First ventilation hole
26b Second ventilation hole
26c Third ventilation hole
26d stator frame
27 Bracket
27a First ventilation path
27b Introduction route
27d Inside air introduction path
28 Bracket
28a Second ventilation path
28b Introductory route
28c exhaust hole
28d inside air inflow path
29 bracket
29a, 29b fin
29c First ventilation path
29d introduction route
30 bracket
30a, 30b fin
30c Second ventilation path
30d introduction path
31 Second ventilation fan
31a fin
31b ventilation hole
32 frames
32a radiation fin
33 bracket
34 cover
35 First ventilation path
36 Second ventilation path
37 Introduction
38 Introduction
39 Circulation fan

Claims (7)

Place the rotor core on the inner circumference side of the stator 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,
A rotor shaft coupled to an inner peripheral portion of the rotor core supported by first and second bearings built in the first and second brackets, respectively;
A first ventilation fan is attached to one end of the rotor shaft outside the machine, and a second ventilation fan is attached to the other end of the rotor shaft outside the machine,
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 first outside air passage for receiving cooling air from the first ventilation fan is provided on an outer portion of the first bracket, 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 second outside air passage for receiving cooling air from the second ventilation fan is provided on an outer portion of the second bracket, and the second outside air passage is communicated with one end of the second ventilation hole. The other end of the second ventilation hole is open to the atmosphere. Place the rotor core on the inner circumference side of the stator 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,
A rotor shaft coupled to an inner peripheral portion of the rotor core supported by first and second bearings built in the first and second brackets, respectively;
A first ventilation fan is attached to one end of the rotor shaft outside the machine, a second ventilation fan is attached to the other end of the rotor shaft outside the machine, and a circulation fan is attached to the inside of the rotor shaft.
A plurality of first, second, and third ventilation holes are respectively formed near the outer periphery of the stator core so as to penetrate in the axial direction,
A first outside air passage for receiving cooling air from the first ventilation fan is provided on an outer portion of the first bracket, 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 second outside air passage for receiving cooling air from the second ventilation fan is provided on an outer portion of the second bracket, and the second outside air passage is communicated with one end of the second ventilation hole. The other end of the second ventilation hole is open to the atmosphere,
By covering both open ends of the third ventilation hole from the outside with the first and second brackets, the third ventilation hole is provided with a passage for a circulating cooling air in the machine generated by rotation of the circulation fan. A fully-closed electric motor for driving a vehicle. 3. The vehicle drive system according to claim 1, wherein a plurality of cooling fins are radially provided on one or both of the inner wall and the outer wall of the first and second brackets. Fully closed motor. A plurality of fins are radially provided on the inner surface of the main plate of each of the first and second ventilation fans, and a plurality of auxiliary ventilation holes are formed in a portion of the main plate closer to the center than the fins in the axial direction. The fully-closed motor for driving a vehicle according to any one of claims 1 to 3, wherein the motor is provided so as to penetrate therethrough. A stator core is mounted on the inner peripheral side of the cylindrical frame, and a rotor core is arranged on the inner peripheral side of the stator core.
A bearing is attached to each of the fixing members provided at both ends in the axial direction of the frame, and the bearings support both ends in the axial direction of the rotor shaft at the center of the rotor core,
A plurality of first ventilation paths and second ventilation paths extending in the axial direction on the outer peripheral portion of the frame and divided in the circumferential direction, respectively;
A first ventilation fan is attached to one axial end of the rotor shaft outside the machine, and a second ventilation fan is attached to the other axial end of the rotor shaft outside the machine,
At one end of the frame in the axial direction, a first introduction path for receiving cooling air from the first ventilation fan is formed, and at the other end of the frame in the axial direction, the second ventilation passage is formed. Forming a second inlet for receiving cooling air from the fan,
The first introduction path communicates with one end of the first ventilation path, and the other end side of the first ventilation path is open to the atmosphere,
The second introduction passage communicates with one end of the second ventilation passage, and the other end of the second ventilation passage is open to the atmosphere.
A fully-closed motor for driving a vehicle, wherein a plurality of cooling fins are provided in each of the first and second ventilation paths so as to extend in an axial direction on an outer peripheral surface of the frame. A plurality of fins are radially provided on an inner surface of one or both main plates of the first and second ventilation fans, and a plurality of auxiliary ventilation is provided at a position closer to the center of the main plate than the position of the fins. The fully closed motor for driving a vehicle according to claim 5, wherein the wind hole is provided so as to penetrate in the axial direction. 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 fan. A fully-closed electric motor for driving a vehicle according to any one of the above.

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