JP4772298B2 - Fully closed electric motor for vehicle drive - Google Patents

Description

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

  In general, in a railway vehicle or the like, a vehicle driving motor is loaded on a carriage disposed under the vehicle body, and the rotational force of the motor is transmitted to wheels via a gear device so that the vehicle travels. Conventionally, this type of vehicle driving motor has the structure shown in FIG.

  The conventional vehicle driving motor shown in this figure has a cylindrical frame 101 which is a fixed member, a bracket 102 is attached to one side of the frame 101, and a housing 103 is provided at the center of the other side of the frame 101. , And both end portions of the rotor shaft 106 are rotatably supported by bearings 104 and 105 provided at the center portions of the bracket 102 and the housing 103, respectively.

  Then, the rotor core 107 is fixed to the central portion of the rotor shaft 106 in the axial direction, and the rotor bar 108 is embedded in each of a large number of grooves formed on the outer periphery of the rotor core 107. A squirrel-cage rotor of the induction motor is formed by projecting from the rotor iron core 107 and connecting the projecting parts integrally with an end ring. The rotor core 107 is provided with a plurality of ventilation holes 107a penetrating in the axial direction.

  A cylindrical stator core 110 is attached to the inner periphery of the frame 101, and the stator coil 111 is housed in a number of grooves formed on the inner periphery of the stator core 110. The coil end portion of the stator coil 111 has a shape protruding on both sides of the stator core 110.

  A uniform gap is formed between the inner peripheral surface of the stator core 110 and the outer peripheral surface of the rotor core 107. The drive side end 106a of the rotor shaft 106 is projected outside the machine. A coupling (coupling) for coupling with the driving gear device is attached to the protruding drive end 106a. A ventilation fan 109 is fixed to an in-machine portion of the rotor shaft 106. This ventilation fan 109 has a plurality of blades 109a arranged radially from the center. A plurality of exhaust ports 102 a are provided along the circumferential direction at a portion of the bracket 102 that faces the outer peripheral portion of the ventilation fan 109.

  An air inlet 101a is provided above the non-driving side of the frame 101, a ventilation filter 112 is attached so as to cover the air inlet 101a, and the outside air inlet portion of the ventilation filter 112 is for capturing dust. A filter 112a is attached.

  In the entire motor shown in FIG. 8, the mounting arm portion provided on the frame 101 is fastened and fixed to the bogie frame with bolts, and the rotational force of the motor is transferred from the gear device to the wheel through a joint connected to the rotor shaft end portion 106a. To the vehicle to drive the vehicle.

  During the operation of the electric motor, the stator coil 111 and the rotor bar 108 of the electric motor generate heat. Therefore, the outside air is circulated in the electric motor to be cooled, and the temperature rise of the electric motor is suppressed. This cooling action is as follows.

  During operation, the ventilation fan 109 is rotated by the rotor shaft 106, and the air in the machine is discharged from the exhaust port 102a to the outside, and accordingly, the outside air is sucked into the machine from the inlet port 101a. The outside air sucked into the machine flows into the machine from the inlet 101a through the ventilation filter 112, then passes through the ventilation hole 107a of the rotor core 107, and between the outer periphery of the rotor core 107 and the inner periphery of the stator core 110. The air flows through the gaps to the side of the ventilation fan 109 and is discharged from the exhaust port 102a by the rotation of the ventilation fan 109.

  By circulating the outside air in the machine in this way, the rotor bar 108, the stator coil 111 and each part in the machine are cooled, so that the temperature rise of the rotor bar 108 and the stator coil 111 does not exceed the allowable temperature.

  However, in the outside air around the vehicle driving motor mounted on an underfloor carriage such as a train, there is a large amount of dust that is wound up when the vehicle travels, and the outside air to be taken in is in a severely polluted environment. Therefore, in the conventional vehicle drive motor shown in FIG. 8, the outside air taken into the machine is captured and cleaned by the filter 112a of the ventilation filter 112, but the operation is continued. Then, the filter 112a is gradually clogged, and the amount of ventilation in the machine is reduced. For this reason, there has been a technical problem that requires regular cleaning and maintenance of the filter at short intervals, and a great deal of labor must be expended.

  In order to solve this problem, in recent years, development of a fully-enclosed external fan cooling type vehicle drive motor has been underway. The structure of this fully-enclosed external fan cooling type motor is shown in FIG. This will be described. A bracket 202 is provided at the drive side end of the bottomed cylindrical frame 201, and a housing 203 is provided at the center on the non-drive side. A stator iron core 204 is provided on the inner periphery of the frame 201.

  A rotor shaft 207 is rotatably supported by bearings 205 and 206 attached to the bracket 202 and the housing 203, respectively. A rotor iron core 208 is provided in the central portion of the rotor shaft 207 in the axial direction. The non-driving side end of the rotor shaft 207 projects outside the machine, and a ventilation fan 209 is attached to this projecting portion.

  The outer peripheral surface of the frame 201 is provided with a large number of cooling fins 201a extending in the axial direction, and is covered with the cover 210 so as to cover the cooling fins 201a, so that the inner side of the cover 210 and the outer side of the frame 201 are surrounded. A space extending in the axial direction is formed, and the air passage 211 is formed in this space.

  The drive side of the ventilation path 211 is open to the outside, and the opposite drive side is open toward the outer peripheral side of the ventilation fan 209. A cover 212 is attached to the non-driving side end of the electric motor, and an outside air intake 212 a is formed in the center of the cover 212 for the ventilation fan 209.

  The fully-enclosed fan-cooled electric motor shown in FIG. 9 is a fully-enclosed type in which the inside of the motor is shut off from the outside, so that a large amount of heat generated inside is provided mainly on the outer peripheral surface of the frame 201. The cooling fins 201a are discharged. During operation, by rotating the ventilation fan 209, the outside air is sent to the ventilation path 211 on the outer peripheral portion of the frame 201 and circulated in the axial direction, so that a large number of cooling fins 201a disposed in the ventilation path 211 can Release heat to the outside air.

  This fully-enclosed external fan cooling type electric motor does not circulate the outside air into the machine, so the inside of the machine is not polluted with the dust mixed in the outside air, and the outside part is cooled by the outside air, so the filter removes dust from the outside air There is also an advantage that becomes unnecessary.

  However, the fully-enclosed external fan cooling motor shown in FIG. 9 does not require a filter and can save labor for maintenance. However, there is a technical problem described below, and improvement has been desired.

  First, since the cooling of the heat generating part in the machine is indirectly performed by the cooling fins 201a via the frame 201, the heat dissipation is low. Therefore, in order to obtain the cooling performance of the conventional electric motor shown in FIG. 8, it is necessary to increase the cooling performance of the cooling fins 201a by increasing the amount of ventilation by the ventilation fan 209.

  However, in order to increase the amount of ventilation, it is necessary to increase the size and diameter of the ventilation fan 209, which increases the noise of the ventilation fan 209 during operation. In recent years, it has been desired to reduce the noise of the drive motor in order to improve the impact on the riding comfort of the vehicle and the surrounding environment. Therefore, it is not desirable to increase the noise due to the increase in the size of the ventilation fan. It was desired.

  Second, there is a problem of an increase in temperature rise of the bearings 205 and 206. Since the bearings 205 and 206 are lubricated with the lubricating grease filled therein, when the temperature of the bearings 205 and 206 rises, the deterioration of the lubricating grease is promoted, and early grease replacement is necessary. In the fully-enclosed external fan cooling type 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, and the temperature rise of the bearing is larger than that of the conventional type.

  Further, since the driving side bracket 202 is positioned on the exhaust air side of the cooling outside air, it is heated by the exhaust air temperature. Moreover, since the cooling air does not hit the bearing 205, the temperature of the driving side bearing 205 is greatly increased. To rise. In motors for vehicle driving, while the effort to save maintenance by extending the grease renewal cycle is progressing, the increase in the temperature rise of the bearings accelerates the deterioration of the lubricating grease, so that the grease can be replaced quickly. There was a technical problem that became necessary, and improvement was desired.

  Thirdly, there is a problem of an increase in size and an increase in mass due to a decrease in cooling performance. In the case of a fully-enclosed external fan cooling type electric motor, the heat inside the electric motor is released to the outside air by the cooling fins 201a on the outer peripheral surface of the frame, so that the cooling efficiency is lower than that of the conventional electric motor of FIG. Therefore, the temperature rise of the stator coil 213 and the rotor bar 214 exceeds an allowable value, and in order to suppress the temperature rise, it is necessary to increase the size of the stator coil 213 and the rotor bar 214 to reduce heat generation. Therefore, the physique of the motor becomes larger than the capacity (output), and the mass increases.

  Further, since the cooling performance of the downstream side of the circulating cooling air decreases as the temperature of the circulating outside air rises, the temperature rise in the portion located on the exhaust air side of the stator coil 213 and the rotor bar 214 is higher than in other portions. It grows and becomes a state of local heat. Therefore, in order to suppress the temperature rise in the local heat section within the 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 carriage, it may be difficult to mount if the size of the drive motor becomes large. On the other hand, if the physique can be mounted in a space, the capacity of the motor will be insufficient and the expected performance cannot be obtained. Therefore, it has been desired to realize a fully-closed electric motor for driving a vehicle that eliminates local heat and has good heat dissipation performance.

  The present invention relates to a conventionally proposed fully-closed electric motor for driving a vehicle, which eliminates internal fouling and at the same time reduces the noise of a cooling fan and reduces the temperature rise of a bearing portion, thereby lubricating grease. It is an object of the present invention to provide a fully-closed electric motor for driving a vehicle that can be reduced in size and weight or increased in capacity (output) by extending the replacement period of the motor, further improving cooling performance and eliminating local heat.

In order to achieve the above object, a fully-closed motor for driving a vehicle according to the present invention has a stator core attached to the inner peripheral side of a stator frame, a rotor core arranged on the inner peripheral side of the stator core, A fully-closed type for driving a vehicle, in which a rotor shaft is coupled to a central portion, brackets that support bearings are attached to both ends in the longitudinal direction of the stator frame, and the rotor shaft is rotatably supported by the bearings. In the electric motor, a first ventilation fan is attached to the rotor shaft at a position on the inner side of the bearing on the driving side, and a second ventilation fan is mounted on the rotor shaft at a position on the inner side of the bearing on the non-driving side. Mounting, a circumferential fine gap between the outer peripheral portion of the first and second ventilation fans and the inner peripheral portion of the bracket projecting to the inside of the machine Configure Rabiransu portion meshes with loosely to form a gap, the respectively radially a plurality of blades in the first and outboard wall surface of the second ventilation fan, the said first ventilating fan A plurality of blades or heat exchange fins are provided on one or both inner wall surfaces of the second ventilation fan, and a plurality of outside air is disposed at positions on the inner diameter side of the blades of the ventilation fans in the brackets. An air inlet is provided, a plurality of external air exhaust ports are provided at positions on the outer diameter side of the outer peripheral portion of the blades of the ventilation fans in the brackets, and an inner wall surface facing the stator iron core in the brackets is provided. Provided with a plurality of heat-absorbing fins, and provided with a plurality of heat-dissipating fins on the outer wall surface of each bracket near the outlet of the exhaust port, After heat exchange with the interior space partitioned by the wall surfaces of the first and second ventilation fans at the wall surface portions of the first and second ventilation fans, the air is discharged from the exhaust ports in a substantially radial direction. It is characterized by that.

  According to the vehicle drive fully-closed electric motor of the present invention, the cooling outside air is circulated and cooled on both sides of the motor by the rotation of the first and second ventilation fans provided at both ends, and the outer periphery of the motor is Since it is cooled by the traveling wind, the cooling performance is improved and local heat is eliminated. Further, since the heat of the in-machine air and the heat of the rotor core are positively released to the outside air circulated by the blades of the first and second ventilation fans, the cooling performance of the rotor and each part of the in-machine is further improved. Therefore, it is possible to reduce the size and weight of the electric motor or increase the capacity. Further, the outside air flows to the surface of the bracket that supports the bearing, so that the cooling performance of the bracket is improved, the temperature rise of the bearing outer ring portion is suppressed, and at the same time, the heat transmitted from the rotor core to the bearing through the rotor shaft is the first. And since it discharge | releases to external air by the 2nd ventilation fan, the temperature rise of a bearing inner ring | wheel part is suppressed. Therefore, it is possible to extend the deterioration life of the lubricating grease and extend the disassembly maintenance period for the maintenance of the electric motor. Furthermore, by distributing the ventilation fans on both sides, it is possible to reduce the size and the diameter of the conventional ventilation fan, and it is possible to reduce noise during operation by reducing noise during operation.

  Hereinafter, an embodiment of the present invention will be described with reference to 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, and FIG. 2 is a cross-sectional view taken along line A-O in FIG.

  In FIG. 2, 1 is a cylindrical stator frame, and a cylindrical stator core 2 is concentrically fixed to the inner peripheral side thereof. A plurality of stator coils 3 are accommodated in the inner peripheral portion of the stator core 2.

  A first outer peripheral bracket 4 is attached to the drive side end of the stator frame 1. On the inner peripheral side, a first inner peripheral bracket 6 incorporating a bearing 5 is fastened by a bolt 7.

  A second outer peripheral bracket 8 is attached to the end of the stator frame 1 on the non-driving side. On the inner peripheral side, a second inner peripheral bracket 10 incorporating a bearing 9 is fastened by a bolt 11.

  A rotor core 12 is disposed on the inner diameter side of the stator core 2. A rotor shaft 13 is attached to the central portion of the rotor core 12, and both ends thereof are rotatably supported by bearings 5 and 9. The drive side end portion 13a of the rotor shaft 13 projects outside the machine, and a joint for connecting the drive gear device is attached to this portion.

  A plurality of rotor bars 14 are accommodated in the outer peripheral portion of the rotor core 12, and a plurality of ventilation holes 12 a penetrating in the axial direction are provided in the inner peripheral portion of the rotor core 12.

  A first ventilation fan 15 is mounted on the rotor shaft 13 at a position adjacent to the machine inner side of the first inner peripheral bracket 6 incorporating the drive-side bearing 5. A second ventilation fan 16 is mounted on the rotor shaft 13 at a position adjacent to the inner side of the second inner peripheral bracket 10 incorporating the counter-drive-side bearing 9.

  A circumferential minute gap is formed by the outer peripheral portion of the main plate of the first ventilation fan 15 and the inner peripheral portion of the overhanging portion of the first outer peripheral bracket 4 on the machine interior side. The circumferential minute gaps are formed in a two-stage structure as irregular shapes.

  Similarly, a circumferential minute gap portion is formed by the outer peripheral portion of the main plate of the second ventilation fan 16 and the inner peripheral portion of the overhanging portion of the second outer peripheral bracket 8 inside the machine.

  A plurality of air blowing blades 15a are provided radially on the outer wall surface of the first ventilation fan 15, and a plurality of air blowing blades 15b are provided radially on the inner wall surface. Further, a plurality of air blowing blades 16 a are provided radially on the outside wall surface of the second ventilation fan 16. The number of blades 15a and the number of blades 16a are different and set to values that are not divisible by each other.

  The wall surface of the first inner peripheral bracket 6 is provided with a plurality of outside air inlets 6a. A plurality of outside air exhaust ports 4 a are provided on the wall surface of the first outer peripheral bracket 4. Further, a large number of heat radiation fins 4 b are provided radially on the outer wall of the first outer peripheral bracket 4, and a plurality of heat absorption fins 4 c are provided radially on the inner wall of the first outer peripheral bracket 4.

  A plurality of outside air inlets 10 a are also provided on the wall surface of the second inner peripheral bracket 10. A plurality of outside air exhaust ports 8 a are provided on the wall surface of the second outer peripheral bracket 8. Further, a large number of heat radiation fins 8 b are provided radially on the outer wall of the second outer peripheral bracket 8, and a plurality of heat absorption fins 8 c are provided radially on the inner wall of the second outer peripheral bracket 8.

  On the outer peripheral surface of the stator frame 1, a large number of cooling fins 1 a are provided in a direction orthogonal to the longitudinal direction of the stator frame 1 (the same direction as the vehicle traveling direction).

  The outer diameter d2 of the first ventilation fan 15 is larger than the outer diameter D of the rotor iron core 12, and smaller than the diameter d1 of the built-in fitting portion, which is a mounting portion between the first outer peripheral bracket 4 and the first inner peripheral bracket 6. It is.

  Further, the outer diameter d3 of the second ventilation fan 16 is smaller than the outer diameter D of the rotor core 12, and the diameter of the built-in fitting portion that is the mounting portion of the second outer peripheral bracket 8 and the second inner peripheral bracket 10 is. It is larger than d4.

  As shown in FIG. 1, the entire electric motor is loaded on a carriage disposed under the floor of the vehicle, with frame arms 1 b and 1 c provided outside the stator frame 1 fixed to the carriage frame with bolts.

  Next, the operation and effects of the vehicle drive fully-closed electric motor according to the first embodiment will be described below.

  During operation, the stator coil 3 and the rotor bar 14 generate heat in the electric motor, and this heat is transmitted to each part in the electric motor and the temperature rises. The heat transmitted to the stator frame 1 is released to the outside air from a large number of cooling fins 1a provided on the outer periphery. Since the cooling fins 1a are arranged along the traveling direction of the vehicle, the traveling wind flows between the cooling fins 1a and is effectively cooled.

  Further, the rotation of the first ventilation fan 15 and the second ventilation fan 16 provided at both ends of the electric motor causes the outside air to flow from the inlet ports 6a and 10a, and then blows up to the outer peripheral side from the exhaust ports 4a and 8a. The outer peripheral brackets 4 and 8 circulate along the outer side wall surfaces. At the same time, the rotation of the blades 15b of the first ventilation fan 15 causes the in-machine air (inside air) to circulate and circulate in the in-machine space.

  The first ventilation fan 15 and the second ventilation fan 16 are attached in close contact with the side surface of the rotor core 12 via the rotor core presser and the rotor shaft 13 having heat conductivity, so that the heat of the rotor core 12 is increased. While being well transmitted to the ventilation fans 15 and 16, the heat generated in each part of the machine is well transmitted to the ventilation fans 15 and 16 through the circulating inside air.

  The outside wall surfaces of the first ventilation fan 15 and the second ventilation fan 16 are forced to circulate cooling outside air by the rotation of the blades 15a and 16a, so that heat generated in the machine and transferred to the ventilation fans 15 and 16 is transmitted. Is released to the open air. In this case, the large number of blades 15a and 16a function as cooling fins (radiating fins) and efficiently release the heat transmitted to the ventilation fans 15 and 16 to the outside air, so that the cooling performance is greatly improved.

  Further, the heat of the circulating internal air is efficiently transferred to the outer peripheral brackets 4 and 8 by the large number of heat absorbing fins 4c and 8c provided on the inner wall surfaces of the first and second outer peripheral brackets 4 and 8, and then provided on the outer wall. Since the heat radiation fins 4b and 8b are discharged into the circulation cooling outside air blown up by the ventilation fans 15 and 16, the cooling performance is further improved.

  As described above, since the motor is cooled in a wide range of the outer peripheral portion and both side portions, since the cooling performance is improved and the whole is uniformly cooled, there is no local heat and conventionally only indirect cooling is possible. The cooling performance of the rotor is also improved, and the motor can be made smaller and lighter or the capacity can be increased than before.

  The first and second inner peripheral brackets 6 and 10 are cooled by the outside air flowing through the inlets 6a and 10a, and the temperature of the built-in bearings 5 and 9 is lowered. Further, the heat transmitted from the rotor shaft 13 to the bearing portions 5 and 9 is prevented by the ventilating fans 15 and 16 acting as a radiator, so that the heat transfer is blocked at this portion and the temperature of the bearings 5 and 9 is lowered. .

  As described above, the temperature of the bearings 5 and 9 on both sides is lowered, thereby extending the life of the lubricating grease and extending the disassembly and maintenance cycle for maintenance. Therefore, it is possible to save maintenance.

  In addition, by distributing the ventilation fans at both ends, the ventilation capacity of one ventilation fan may be halved compared to one conventional centralized fan, and the ventilation fan can be downsized and reduced in diameter. The noise of the ventilation fans can be reduced at the same time, and the number of blades of both ventilation fans is set to a different value, so that the noise frequency generated by both ventilation fans is different and no noise increase phenomenon occurs.

  When disassembling the motor during maintenance, the relationship between the outer diameter of the ventilation fans 15 and 16 and the diameter of the fitting portion between the outer peripheral brackets 4 and 8 and the inner peripheral brackets 6 and 10 is expressed as d4 <d3 <D <d2 <d1. Therefore, by simply removing the fastening bolts 7 and 11, the rotor can be extracted from the stator to the drive side at the same time as the bearing portion, so that the bearing portion can be easily disassembled and the motor can be disassembled and assembled. It is possible to save labor in maintenance work.

  Next, a vehicle drive fully-closed electric motor according to a second embodiment of the present invention will be described with reference to FIG. In the following embodiments, the same or similar parts as those of the previously described embodiments are denoted by the same reference numerals, and overlapping descriptions are partially omitted.

  In the present embodiment, the stator frame 1 is configured to be short in the longitudinal direction, and the outer peripheral portions of the first outer peripheral bracket 4 and the second outer peripheral bracket 8 are extended and attached to the side surfaces of the stator frame 1.

  Further, the first outer peripheral bracket 4 and the second outer peripheral bracket 8 are formed of a material having excellent thermal conductivity such as an aluminum alloy, and a plurality of heat radiation fins 4b, 4d, 8b and 8d are provided, and a number of heat absorbing fins 4c and 8c are provided on the inner wall.

  In addition, the first ventilation fan 15 and the second ventilation fan 16 are also formed of a material having excellent thermal conductivity such as an aluminum alloy, and the first ventilation fan 16 is provided on the inner wall surface of the second ventilation fan 16. As with 15, a plurality of blades 16 b for blowing are provided.

  In the vehicle drive fully-closed electric motor according to the second embodiment, the heat of the rotor is well transmitted to the ventilation fans 15 and 16, and the heat of the inside air is good to the ventilation fans 15 and 16 and the outer peripheral brackets 4 and 8. Since it is transmitted to the outside cooling air efficiently, the cooling performance of the electric motor is further improved.

  Further, in this embodiment, the outer peripheral brackets 4 and 8 and the ventilation fans 15 and 16 are made of the same material and have close thermal expansion coefficients. Even when the outer peripheral brackets 4 and 8 and the ventilation fans 15 and 16 are thermally expanded due to a temperature rise, The dimension of the circumferential minute gap formed by 16 does not change, so that the original dimension of the minute gap can be set smaller, and the dustproof and waterproof performance can be improved.

  Moreover, the effect which reduces the mass of an electric motor also arises by forming the outer periphery brackets 4 and 8 and the ventilation fans 15 and 16 with lightweight materials, such as an aluminum alloy. In addition, since the frame motor 1b provided in the stator frame 1 is used for attachment to the carriage as the entire motor, there is no problem in strength even if the outer peripheral brackets 4 and 8 are formed of aluminum alloy or the like.

  Next, a vehicle drive fully-closed electric motor according to a third embodiment of the present invention will be described with reference to FIG.

  An inside air outlet 1c is provided at a part of the driving side of the stator frame 1, and an inside air inlet 1d is provided at a part of the non-driving side. A cooler 17 is attached to an outside portion of the electric motor, and the cooler 17 has a cooling air passage 17a extending in the longitudinal direction, and one end of the cooler 17 is connected to a drive-side in-machine space via an inside air outlet 1c of the stator frame. The other end is communicated with the interior space on the non-driving side via the inside air inlet 1d.

  A large number of heat-absorbing fins 17b are provided along the longitudinal direction on the inner wall surface of the cooling air passage 17a, and a plurality of heat-radiating fins 17c are provided on the outer wall surface in a direction orthogonal to the longitudinal direction.

  15b for ventilation is provided radially on the inner wall of the first ventilation fan 15, and a number of heat absorbing fins 16c extending along the circumferential direction are provided on the inner wall of the second ventilation fan 16. Other structures are the same as those in the first embodiment.

  In the vehicle drive fully-closed electric motor of this embodiment, the inside air enters the cooling air passage 17a of the cooler 17 from the inside air outlet 1c by the fan action of the blade 15b on the inner wall side of the first ventilation fan 15 during operation. After the circulation, the air flows into the space on the counter-drive side from the inside air inlet 1d, circulates along the inner wall surface of the second ventilation fan 16, passes through the ventilation hole 12a, and reaches the blade 15b of the first ventilation fan 15. Circulates and recirculates along the path returning to the inner diameter side.

  When the inside air flows through the cooling air passage 17a, the heat of the inside air is transmitted to the large number of heat absorbing fins 17b, and then released from the large number of heat radiating fins 17c to the outside air running wind, whereby the flowing inside air is cooled.

  The cooled inside air flows into the machine and cools each part of the machine. Further, the heat of the circulating air is transmitted to the ventilation fan 16 by the large number of radiating fins 16c provided on the inner wall portion of the second ventilation fan 16, and is released to the outside air flowing on the outer wall side. descend.

  In addition, since the heat absorption fin 16c provided in the inner wall of the 2nd ventilation fan 16 is provided in the form extended in the circumferential direction, since a fan effect does not arise at the time of rotation, it does not prevent the circulation circulation of internal air.

  As described above, in the fully-closed electric motor for driving the vehicle according to the present embodiment, the inside air can be cooled by the cooler 17 in addition to the effects described in the first embodiment. Can be further improved, and further reduction in size and weight of the electric motor or increase in capacity can be achieved.

  Next, a vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the inside air outlet 4a is provided in a part of the first outer peripheral bracket 4 on the driving side, the inside air inlet 8a and the outside air outlet 8b are provided on the second outer peripheral bracket 8 on the non-driving side, and the outside of the motor is installed. A cooler 17 having an internal air passage 17d and an external air passage 17e extending in the longitudinal direction of the electric motor is attached to the upper portion.

  The inside air air passage 17d is formed around the outside air air passage 17e, and one end of the inside air air passage 17d communicates with the cabin space via the inside air outlet 4a provided in the first outer peripheral bracket 4, and the inside air air passage 17d The other end communicates with the interior space via an inside air inlet 8 a provided in the second outer peripheral bracket 8.

  One end of the outdoor air passage 17e communicates with the outer peripheral space where the outboard blades of the second ventilation fan 16 are located via the outside air outlet 8b provided in the second outer peripheral bracket 8, and the other end of the outside air air passage 17e. Is in an open state in the air space outside the machine on the drive side.

  A large number of heat-absorbing fins 17f and 17g are arranged along the longitudinal direction on the inner wall surface of the internal air duct 17d, and a large number of radiating fins 17h are arranged along the longitudinal direction on the inner wall surface of the outside air duct 17e. A large number of radiating fins 17c are arranged in the direction perpendicular to the longitudinal direction on the outer wall surface of the internal air duct 17d.

  In the vehicle drive fully-closed electric motor according to the fourth embodiment, during operation, the inside air circulates and circulates through the inside air air passage 17d of the cooler 17 and the in-machine space, thereby cooling each part in the machine. When the inside air circulates in the inside air wind passage 17d, the heat of the inside air is efficiently transferred to the cooler 17 by the large number of heat absorbing fins 17f and 17g, and then released to the running wind of the outside air by the large number of heat radiating fins 17c. At the same time, since the large number of heat dissipating fins 17h in the outside air passage 17e are discharged to the outside air blown by the second ventilation fan 16, the cooling of the inside air is further improved, and the cooling performance of each part in the machine is further improved. The motor can be reduced in size and weight, or the capacity can be increased.

  Next, a fifth embodiment of the present invention will be described with reference to FIG.

  A plate 18 is fixed to the inner side of the outer peripheral bracket 8 with bolts 19, and a circumferential minute gap (dimension a part) is formed between the inner peripheral part of the plate 18 and the outer peripheral part of the ventilation fan 16. .

  The plate 18 and the ventilation fan 16 are made of a material having excellent thermal conductivity such as an aluminum alloy, and the outer peripheral bracket 8 is made of steel.

  At normal temperature, the inner diameter fitting portion (diameter = d5) of the plate 18 is in close contact with the outer peripheral bracket 8, and the outer diameter fitting portion (diameter = d6) is the recess 8e formed inside the second outer peripheral bracket 8. A circumferential gap 20 is formed on the inner surface. The size b in the radial direction of the gap 20 is a dimension that is in close contact with the inner surface of the recess 8e when the outer diameter of the plate 18 increases due to the temperature rise during operation, particularly the difference in thermal expansion between the outer peripheral bracket 8 and the plate 18. Is set.

  In the electric motor having this structure, the ventilation fan 16 is made of a material having excellent thermal conductivity such as an aluminum alloy, so that the heat in the machine is well transmitted to the ventilation fan 16 and released to the outside air, thereby further improving the cooling effect. To do.

  The ventilation fan 16 is thermally expanded due to a temperature rise, but in the case of a material such as an aluminum alloy, the coefficient of thermal expansion is larger than that of a steel material, so that an increase in the outer diameter due to the thermal expansion becomes large. On the other hand, since the plate 18 is also made of the same material as the ventilation fan 16, the inner diameter increases due to thermal expansion equivalent to that of the ventilation fan 16 when the temperature rises.

  For this reason, the radial dimension a of the circumferential minute gap does not change even at room temperature and when the temperature rises. Therefore, the dimension a can be set small, and the dustproof and waterproof functions are not deteriorated.

  In addition, since the attachment with the outer periphery bracket 8 of the plate 18 is positioned by the inner diameter fitting part (diameter = d5) and the outer diameter fitting part (diameter = d6) at the time of normal temperature and when the temperature rises, Even if the cooling change is repeated, the mounting position of the plate 18 does not go wrong.

  As mentioned above, although embodiment of this invention was described based on drawing, this invention is not limited to the induction generator shown in figure, For example, it is the same also in the synchronous motor using a permanent magnet, and the electric motor of another system. The effect of the present invention can be obtained by the configuration.

  The present invention is particularly effective when applied to an electric motor in which a permanent magnet is provided on the rotor core instead of the rotor bar. That is, since the permanent magnet does not generate heat, the structure of the present invention makes it easier to obtain a desired cooling performance.

1 is a front view of a fully-closed electric motor for driving a vehicle according to a first embodiment of the present invention. AO line sectional view of FIG. Sectional drawing of the fully closed type motor for a vehicle drive of the 2nd Embodiment of this invention. Sectional drawing of the fully closed type motor for a vehicle drive of the 3rd Embodiment of this invention. Sectional drawing of the fully closed type motor for a vehicle drive of the 4th Embodiment of this invention. BB sectional drawing of FIG. Sectional drawing of the fully closed type motor for a vehicle drive of the 5th Embodiment of this invention. Sectional drawing of the conventional closed self-cooling cooling type vehicle drive fully closed motor. Sectional drawing of the conventional fully enclosed electric motor for a vehicle drive.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator frame 2 Stator iron core 4 1st outer periphery bracket 4a Exhaust port 4b Radiation fin (fin for heat exchange)
4c Endothermic fin (heat exchange fin)
5 Drive Bearing 6 First Inner Bracket 6a Inlet 8 Second Outer Bracket 8a Exhaust 8b Heat Dissipation Fin (Heat Exchange Fin)
8c Endothermic fin (heat exchange fin)
9 Bearing on the non-driving side 10 Second inner peripheral bracket 10a Air inlet 12 Rotor core 12a Ventilation hole 13 Rotor shaft 15 First ventilation fan 16 Second ventilation fan 15a Blade 15b Blade 16a Blade 16b Blade 16c Heat absorption fin ( Heat exchange fins)
17 Cooler 17a Cooling air passage 17b Endothermic fin (heat exchange fin)
17c Radiation fin (heat exchange fin)
17d Inside airway 17e Outside airway 18 Plate

Claims (7)

A stator core is attached to the inner peripheral side of the stator frame, a rotor core is disposed on the inner peripheral side of the stator core, a rotor shaft is coupled to the center of the rotor core, and bearings are provided at both ends in the longitudinal direction of the stator frame. In the fully-closed motor for driving a vehicle configured to attach a bracket that supports the rotor shaft and rotatably support the rotor shaft by the bearings,
A first ventilation fan is attached to the rotor shaft at a position on the inner side of the bearing on the drive side, and a second ventilation fan is attached to the rotor shaft at a position on the inner side of the bearing on the anti-drive side, The labyrinth portion is engaged in a loosely fitted state so as to form a circumferential minute gap between the outer peripheral portion of the first and second ventilation fans and the inner peripheral portion of the bracket projecting to the inside of the machine. Configured, and radially provided with a plurality of blades on the outside wall of the first and second ventilation fans,
A plurality of blades or heat exchange fins are provided on the inner wall surface of either one or both of the first ventilation fan and the second ventilation fan,
A plurality of outside air inlets are provided at positions on the inner diameter side of the blades of the ventilation fans in the brackets, and a plurality of inlets are provided at positions on the outer diameter side of the outer periphery of the blades of the ventilation fans in the brackets. Provide an outside air vent,
A plurality of heat-absorbing fins are provided on the inner wall surface of the bracket facing the stator core, and a plurality of heat-radiating fins are provided on the outer wall surface of the bracket near the outlet of the exhaust port,
The outside air taken in from each of the air inlets exchanges heat with the interior space partitioned by the wall surfaces of the first and second ventilation fans at the wall surface portions of the first and second ventilation fans. Thereafter, the vehicle drive fully-closed electric motor is discharged in a substantially radial direction from each of the exhaust ports. A stator core is attached to the inner peripheral side of the stator frame, a rotor core is disposed on the inner peripheral side of the stator core, a rotor shaft is coupled to the center of the rotor core, and bearings are provided at both ends in the longitudinal direction of the stator frame. In the fully-closed motor for driving a vehicle configured to attach a bracket that supports the rotor shaft and rotatably support the rotor shaft by the bearings,
Each bracket is composed of an outer peripheral bracket attached to an end of the stator frame in the longitudinal direction and an inner peripheral bracket attached to the inner peripheral side of the outer peripheral bracket and incorporating the bearing. The first ventilation fan is attached to the rotor shaft at a position inside the machine, the second ventilation fan is attached to the rotor shaft at a position inside the machine than the bearing on the counter-drive side, and the first and second ventilation fans are attached to the rotor shaft. The labyrinth meshes in a loosely fitted state so as to form a circumferential minute gap between the outer peripheral part of the ventilation fan and the inner peripheral part of the outer peripheral bracket adjacent to each of the ventilation fans. Forming a plurality of blades radially on the outside wall of the first and second ventilation fans,
A plurality of blades or heat exchange fins are provided on the inner wall surface of either one or both of the first ventilation fan and the second ventilation fan,
Each of the inner peripheral brackets is provided with a plurality of outside air inlets, and each of the outer peripheral brackets is provided with a plurality of outside air exhaust ports at a position on the outer diameter side of the outer peripheral portion of the blade, The outer diameter of the second ventilation fan is set such that the outer diameter of the fan is larger than the outer diameter of the rotor core and smaller than the diameter of the mounting portion between the outer peripheral bracket and the inner peripheral bracket on the first ventilation fan side. Smaller than the outer diameter of the rotor core and larger than the diameter of the mounting portion between the outer peripheral bracket and the inner peripheral bracket on the second ventilation fan side,
A plurality of heat absorbing fins are provided on the inner wall surface of the outer peripheral bracket facing the stator core, and a plurality of heat radiating fins are provided on the outer wall surface near the outlet of the exhaust port in each outer peripheral bracket,
The outside air taken in from each of the air inlets exchanges heat with the interior space partitioned by the wall surfaces of the first and second ventilation fans at the wall surface portions of the first and second ventilation fans. Thereafter, the vehicle drive fully-closed electric motor is discharged in a substantially radial direction from each of the exhaust ports.   Cooling having a plurality of blades radially provided on the inner wall surface of the first ventilation fan, a plurality of ventilation holes penetrating in the axial direction in the rotor core, and a cooling air passage extending in the longitudinal direction outside the machine The cooling air passage is communicated with both ends of the cooling air passage to a drive side internal space facing one side surface of the stator core and a counter drive side internal space facing the other side surface of the stator core. 3. A fully-closed electric motor for driving a vehicle according to claim 1, wherein a plurality of heat exchange fins are provided on an inner wall surface and an outer wall surface of the cooling air passage of the vessel.   A plurality of blades are radially provided on the inner wall surface of the first ventilation fan, a plurality of ventilation holes penetrating in the axial direction are provided in the rotor iron core, and an internal air passage and an outdoor air extending in the longitudinal direction outside the machine A cooler provided adjacent to the road is attached, both ends of the internal air passage are communicated with the drive-side internal space and the non-drive-side internal space, and one end of the external air passage is connected to the second ventilation fan. 3. The vehicle driving system according to claim 1, wherein the vehicle driving surface is communicated with a space on the outer peripheral side of the blade provided on the outer wall surface of the aircraft and the other end side is opened to an atmospheric space outside the aircraft. Closed motor.   The number of blades provided on the outside wall of each of the first ventilation fan and the second ventilation fan is set to a different number and set to a value that is not divisible by each other. A fully-closed electric motor for driving a vehicle according to any one of the preceding claims. The vehicle drive fully-closed electric motor according to any one of claims 1 to 5 , wherein the bracket and the ventilation fans are made of a material having excellent thermal conductivity such as an aluminum alloy . Each ventilation fan is formed of a material having excellent thermal conductivity such as an aluminum alloy, and a plate that forms a circumferential minute gap facing the outer peripheral surface of each ventilation fan is attached to the bracket. The vehicle drive fully-closed electric motor according to any one of claims 1 to 6, wherein the material has a thermal expansion coefficient equal to or close to that of each of the ventilation fans .

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