JP2005130693A - Fully-enclosed motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fully enclosed motor capable of weight reduction, labor saving in maintenance and manufacturing cost reduction, by improving the cooling performance. <P>SOLUTION: Tubular connection air ducts 21, 22 are respectively provided on the outside of each of openings at both ends of a stator frame 1, and a tubular cooling air duct 23, having a surface, is disposed between the connecting air ducts 21, 22. One end of each of internal spaces of the connecting air ducts 21, 22 communicates with an in-machine space via the opening in a stator frame 1, and the other end thereof communicates with an internal space in the cooling air duct 23. A plurality of radiation fins 20 are provided on the outer-periphery wall of the cooling air duct 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a fully-closed motor having a fully-closed configuration in which a vehicle such as a railway is suitable as a drive motor and outside air is not taken into the machine.

  In a railway vehicle such as a train, a vehicle driving motor is loaded on a carriage disposed under the vehicle body, and the vehicle is driven by transmitting the rotational force of the motor to wheels via a gear device.

  Conventionally, this type of electric motor has an open self-ventilation cooling system in which cooling is performed by circulating outside air into the machine by rotation of a ventilation fan fixed to a rotor shaft in the machine.

  In this open type self-ventilation method, in order to prevent the inside of the machine from being polluted by the dust mixed in the cooling outside air, a ventilation filter is provided at the inlet, and the dust in the inflowing outside air is captured by the filter in the ventilation filter. ing.

  Therefore, in order to prevent an increase in the temperature of the motor due to a decrease in inflowing outside air due to the clogging of the filter, the filter is cleaned at a relatively short period.

  However, it is difficult to completely capture the dust with the filter, so the dust that has entered the machine adheres to the interior of the machine and gradually accumulates, causing deterioration of insulation performance and cooling effect. Therefore, it is necessary to clean the inside to remove dust.

  In order to save the maintenance of the filter and to save the maintenance by extending the period of disassembly and cleaning of the motor, the adoption of a fully-closed motor disclosed in Patent Document 1 and the like has been studied.

  With reference to FIG. 30, a conventional example of this type of fully-closed electric motor will be described.

  As shown in FIG. 30 (a), the configuration of the fully-closed electric motor has a cylindrical stator core 2 on the inner peripheral portion of a bottomed cylindrical stator frame 1. The stator coil 3 is mounted in the groove. A bearing bracket 4 and a bearing housing 5 each including bearings 6 and 7 are attached to both ends of the stator frame 1, and both ends of the rotor shaft 8 are supported by the bearings 6 and 7. A rotor iron core 9 is attached to the central portion of the rotor shaft 8, a number of grooves are provided in the outer periphery of the rotor iron core 9, and a rotor bar 10 is attached to the center of the grooves. Both ends of the rotor bar 10 are integrally bound by an end ring (short-circuit ring) to form a cage rotor of the induction motor as a whole.

  On the inner peripheral side of the rotor core 9, a plurality of rotor ventilation holes 9 a are provided on the circumference. A circulation fan 11 for circulating the inside air inside the rotor shaft 8 is attached.

  Ventilation holes 1a and 1b are provided at both ends of the stator frame 1, and are composed of connection cooling air passages 12 and 13, a plurality of pipes 14, and a plurality of heat radiation fins (cooling fins) 15 so as to cover the ventilation holes 1a and 1b. A cooler is attached to the outside of the stator frame 1 by bolts.

  As shown in FIG. 30 (b), which is a cross-sectional view taken along the line AA in FIG. 30 (a), the electric motor is fixed to the bogie frame 100 of the electric vehicle by bolts with an arm 1c provided on the stator frame 1, and is outside the machine. It is connected to a gear device (not shown) via a joint of the projecting rotor shaft end 8a, and the gear device is connected to the axle 101 integrated with the wheel, so that the rotational force of the motor is transmitted to the wheel 102 on the rail 103. It is the composition to do.

  Under this configuration, the internal air in the machine enters the intake passage 12a of the cooler through the vent 1a by the rotation of the circulation fan 11 during operation, and further flows into the exhaust passage 13a through the plurality of ventilation paths 14a. It flows into the aircraft through the rear vent 1b. The inside air flowing into the machine flows through the ventilation hole 9a of the rotor iron core and returns to the inner diameter side of the circulation fan 11. Thus, during operation, the inside air circulates in the cooler and the machine.

  During operation, the stator coil 3, the rotor bar 10, and the end ring generate heat, thereby increasing the temperature of each part in the machine. However, the heated inside air is cooled by the radiating fins 15 when flowing through the ventilation path 14a in the cooler, and the cooled inside air flows through the inside of the machine to cool each part in the machine, so that the temperature of the stator coil 3 and the rotor bar 10 The rise is prevented from exceeding the specified value.

  Since the radiating fins 15 are arranged in the same direction as the traveling direction of the vehicle in a direction orthogonal to the longitudinal direction of the motor, since the traveling wind circulates between the radiating fins 15, the radiating action of the radiating fins 15 is improved. The coolability of the inside air flowing through the ventilation path 14 is improved.

In this way, in this configuration, since the motor is cooled without circulating outside air in the machine, the filter of the ventilation filter is not necessary, and there is no contamination in the machine, so the decomposition cycle of the motor can be extended. Labor saving can be achieved.
Japanese Patent Laid-Open No. 9-205758

  However, there are three problems to be solved in the fully closed electric motor having this configuration.

  The first is a configuration in which a large number of air passages 14a of the cooler are arranged densely in a pipe configuration and further divided by a large number of radiating fins 15, so that dust and paper / cloth waste from the outside air easily adheres, As the service period elapses, the pipes gradually become clogged and the cooling performance decreases. Therefore, it is necessary to periodically remove the dust and cloth waste by performing air blowing or the like (blowing of compressed air). However, since the pipes 14 and the radiation fins 15 are interlaced, it is difficult to sufficiently remove dust and the like attached to the back.

  Second, in the ventilation path from the vent 1a of the cooler to the pipe 14, the ventilation area is abruptly narrowed by the wall between the pipes 14, so the ventilation resistance of the pipe inlet loss is increased. FIG. 31 shows the flow of wind in the fully closed electric motor of FIG. 30 with arrows, and it can be seen that a backward vortex is generated at the inlet of the pipe 14.

  Accordingly, circulation circulation between the cooler and the entire machine is deteriorated, and the cooling efficiency of the entire motor is lowered.

  The fully closed electric motor having a conventional pipe configuration has an inevitable increase in size of the electric motor as compared with the open self-air-cooling type because the cooling efficiency is inferior.

  However, in recent years, the speed and performance of vehicles have been remarkably increased, and the demand for higher output and smaller size and weight of drive motors has been increasing. Realization of an electric motor is desired.

  Thirdly, since the circumference of the pipe 14 and the radiating fins 15 are joined by welding, the number of pipes and the number of radiating fins must be welded, resulting in poor mass production and low production costs. There is a drawback of becoming larger

An object of the present invention is to provide a fully-closed electric motor capable of reducing the size and weight by improving the cooling performance, saving labor and reducing manufacturing costs.

According to the present invention, a plurality of rotor ventilation holes are formed on the inner peripheral side of the rotor core, an internal air circulation fan is provided at one end of the rotor shaft inside the machine, and openings are provided at both axial ends of the stator frame. In a fully-enclosed electric motor in which a cooler is provided outside the machine of the frame, the interior space of the cooler is communicated with openings at both ends of the stator frame, and air is circulated and circulated in the cooler. ,
A connection air passage is provided outside each of the openings at both ends of the stator frame, a cylindrical cooling air passage having a wall surface is disposed between the connection air passages, and one end of each internal space of the connection air passage is connected to the one end of the inner space. The stator frame communicates with the interior space through the opening of the stator frame, the other ends communicate with the internal space of the cooling air passage, and a plurality of heat radiation fins are provided on the outer peripheral wall of the cooling air passage. .

  According to such a configuration, during operation, the cooling air passage absorbs heat and releases heat to the atmosphere by a large number of heat dissipating fins. In this case, the cooling outside air when the vehicle travels flows along the outer peripheral surface of the cooling air passage, so that dust and cloth mixed in the outside air do not adhere to the cooling air passage and the radiation fins and do not stop. Less adherence. Further, it is possible to easily and surely remove dust such as compressed air blowing.

  According to the present invention, since the cooling performance of the circulating air cooler is improved, the temperature rise of each part in the machine can be reduced, so that the motor can be reduced in size and weight or the capacity (output increased). At the same time, it is possible to provide a fully-closed electric motor that can save labor for maintenance of the cooler.

  Hereinafter, a fully-closed electric motor according to the present invention will be described with reference to FIGS. 1 to 29 in which the same parts as those in FIGS.

(First embodiment)
A fully-closed electric motor according to a first embodiment of the present invention will be described with reference to FIG.

  FIG.1 (b) is front sectional drawing, Fig.1 (a) is front sectional drawing which follows BB in FIG.1 (b).

  In FIG. 1, a cylindrical stator core 2 is attached to the inner peripheral surface of the stator frame 1, the stator coil 3 is placed in a number of grooves provided over the entire inner periphery of the stator core 1, and both end portions of the stator frame 1 are The bearing bracket 4 and the bearing housing 5 in which the bearings 6 and 7 are respectively built are attached, and the rotor shaft 8 is supported by the bearings 6 and 7. A rotor core 9 is attached to the longitudinal center portion of the rotor shaft 8, and a large number of grooves are provided on the outer periphery of the rotor core 9, and a rotor bar 10 is accommodated in the grooves, on the inner peripheral side of the rotor core 9. A plurality of rotor ventilation holes 9a are formed on the circumference. A circulation fan 11 for circulating the inside air is attached to one end of the rotor shaft 8 at the in-machine position.

  Ventilation holes 1a and 1b are provided at both ends in the longitudinal direction of the stator frame 1, and connection air passages 21 and 22 are attached to the outside of the stator frame 1 so as to cover the ventilation holes 1a and 1b, respectively.

  The difference from the conventional one is a cooler, which is composed of connection air passages 21, 22, a cooling air passage 23, and heat radiation fins 20. A cylindrical cooling air passage 23 having a flat surface (including an arc surface) extending in the same direction as the longitudinal direction of the stator frame 1 is provided between the two connection air passages 21 and 22. In other words, the connection air passages 21 and 22 and the cooling air passage 23 are substantially U-shaped when viewed from the axial direction. Further, a large number of heat radiation fins 20 are arranged on the outer peripheral wall surface of the cooling air passage 23 in a direction orthogonal to the longitudinal direction of the cooling air passage 23. In this case, when viewed from the direction perpendicular to the axis, the outer shape of the entire radiation fin 20 is substantially rectangular.

  The connecting air passages 21 and 22 and the cooling air passage 23 constituting the cooler are manufactured separately, and both are integrally formed by welding or the like, and those obtained by dividing them in the axial direction are welded or the like. Or may be formed by some method from the beginning. In this case, the boundary between the connection air passages 21 and 22 and the cooling air passage 23 is not clear, but the connection air The roads 21 and 22 point near the end portion attached to the stator frame 1.

  The operation of the fully-closed electric motor of the present embodiment configured as described above will be described below.

    As shown in FIG. 1, during operation of the electric motor, the air in the machine is blown up to the outer circumferential space in the radial direction of the circulation fan 11 by the rotation of the circulation fan 11, and then the air intake path in the connection air passage 21 from the vent 1a. After flowing into 16 a, it flows through each ventilation path 2 a, flows through the first exhaust path 17 a in the cooling air path 23, and flows into the in-machine space on the counter-drive side from the vent 1 b. The inside air that has flowed into the machine flows axially through the gap between the outer peripheral surface of the rotor core 9 and the inner peripheral surface of the stator core 2 and the ventilation holes 9a of the rotor core 9, and returns to the inner diameter side of the circulation fan 11.

    Thus, in the present embodiment, during operation, the in-machine air circulates and circulates through the cooler as a route. When the in-flight air of the ventilation path 23 a in the cooling air passage 23 circulates, the cooling air passage 23 absorbs heat and further releases it to the atmosphere by the radiation fins 20 provided on the outer peripheral surface of the cooling air passage 23. In the conventional pipe configuration, there is a problem that a vortex flow is generated at the inlet of the pipe and the inlet loss is large. However, in this embodiment, as shown in FIG. However, for example, because of one cylindrical shape, vortex flow does not occur. Therefore, since the inlet loss is small and the shape is cylindrical, the ventilation resistance of the flow path of the cooling air passage 23 is also small, so that the circulating air volume can be increased, so that the cooling performance of the entire main motor can be improved.

    Further, in the case where the conventional pipe configuration, the ventilation cross-sectional area, and the ventilation cross-sectional area of the cooling air passage 23 are equal, in the present embodiment, the cooling air passage 23 has a cylindrical shape. The size of 23 does not increase. Accordingly, the area of the radiating fin 20 can be increased on the outer peripheral surface of the cooling air passage 23, so that the cooling efficiency of the radiating heat is good and the heat is released to the outside air, so that the cooling action is further improved.

    Further, during operation, the cooling outside air flows between the outer peripheral surface of the cooling air passage 23 and the heat radiating fins 20. In the present embodiment, since the cooling air passage 23 is cylindrical, dust / cloth waste can be obtained even during a long-term operation period. Etc. are difficult to adhere to the cooling air passage 23 and the heat radiating fin 20, the cooling effect of the heat radiating fin 20 does not deteriorate for many years.

    In addition, even when dust adheres to the surface after long-term use, the cylindrical cooling air passage 23 can be easily cleaned and removed by air blowing or the like compared to the conventional pipe configuration, so the main motor is removed from the carriage, Eliminates the need for maintenance that requires extensive cleaning.

    Further, the material of the cooling air passage 23 is generally made of a thin steel plate, but may be made of an aluminum plate in order to reduce the weight and improve the cooling performance. However, since it is difficult to weld the pipe structure and the aluminum plate of the conventional structure, it is difficult to manufacture the structure having a large number of heat radiation fins 20. On the other hand, since the cooling air passage 23 of this embodiment is cylindrical, the welded portion becomes a straight portion, and the heat radiation fin 20 can be easily welded to the outer peripheral wall of the cooling air passage 23. Therefore, the manufacturing cost can be reduced.

    Next, in order to confirm the cooling effect of the present invention, a temperature rise test was performed on the prototype. The temperature rise test is performed at the rated speed of each operating speed, and the power source is a sine wave power source. Simulated wind (approx. 2 m / s) is sent around the main motor to simulate the effect of running the train. The test was conducted.

    The test results are shown in FIG. The scale on the vertical axis indicates the temperature increase ratio, and each measurement point is indicated on the horizontal axis. From this result, as compared with the conventional example, the effect of the present embodiment is obtained as a whole, and the temperature reduction of the rotor and the stator coil is particularly large.

    As described above, in the fully-closed electric motor according to the present embodiment, the cooling performance can be improved, so that it is possible to reduce the size and weight and / or increase the output. Furthermore, the cooling and maintenance of the cooler can be reduced, and the manufacturing cost can be reduced.

(Second Embodiment)
Next, a fully-closed electric motor according to a second embodiment of the present invention will be described with reference to FIG. 4 (a) which is a longitudinal sectional view and FIG. 4 (b) which is a front sectional view.

  The present embodiment is configured such that the connection air passages 21, 22, the cooling air passages 23, and the heat radiation fins 20 form a substantially fan shape as a whole on the extension of the blades of the circulation fan 11 when viewed from the axial direction of the electric motor. doing.

  FIG. 5 shows the flow of the internal air blown up by the circulation fan 11 (indicated by arrows) as a result of time change, and 27 in the figure schematically shows the pressure distribution of the wind. It is. Since the circulation fan 11 is a centrifugal radial fan, wind is blown outward in the radial direction by the centrifugal force between the blades, and is further blown obliquely in the rotational direction by the rotational force. Therefore, by making the cooling air passage 23 into a substantially fan shape, the wind blown up by the centrifugal force spreads to every corner of the connection air passages 21 and 22.

  Therefore, since the ventilation efficiency in the cooling air passage 23 is increased, the air flow characteristics are improved, and the circulating air can be discharged more efficiently to the outside air, so that the cooling performance of the electric motor can be further improved.

(Third embodiment)
Next, a fully-closed electric motor according to a third embodiment of the present invention will be described with reference to FIG. 6 (a) which is a longitudinal sectional view and FIG. 6 (b) which is a front sectional view.

  The configuration of the present embodiment is that the angles of the vents 1a and 1b that are openings at both ends of the stator frame 1, the inlet angles of the connection air passages 21 and 22, and the blades of the circulation fan 11 are viewed from the axial direction of the electric motor. The pitch angle or an integer multiple of the pitch angle is made to coincide (angle φ).

  According to the present embodiment, by matching the blade pitch of the circulation fan 11 and the inlet angle of the connection air passages 21, 22, the phase of the wind flow in the in-flight one-way cooling air passage coincides. The maximum airflow is obtained. As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

(Fourth embodiment)
Next, a fully closed electric motor according to a fourth embodiment of the present invention will be described with reference to FIG. 7A which is a longitudinal sectional view and FIG. 7B which is a front sectional view.

  The configuration of the present embodiment includes the inlet angle of the connection air passages 21 and 22, the blade pitch angle of the circulation fan 11 or an angle that is an integer multiple thereof, and the circumferential pitch of the rotor ventilation holes 9 a as viewed from the axial direction of the electric motor. Are matched (angle φ). In addition, a lattice-shaped structure, for example, a partition plate 24 is provided in the internal space 23 a of the cooling air passage 23 so as to become a window in the direction of ventilation, and guide plates 19 having a circular arc cross section are provided at both ends of the lattice-shaped body 24. It is provided.

  According to the present embodiment, by making the inlet angle of the connection air passages 21 and 22 coincide with the blade pitch angle of the circulation fan 11 or an integer multiple thereof, and the circumferential pitch of the rotor ventilation holes 9a, the in-flight circuit The phase of the wind flow in the cooling air passage is in agreement, and thereby the maximum air volume of the circulation fan 11 is obtained. As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

  Next, in order to confirm the effect of this embodiment, a temperature rise test was performed on the prototype. The temperature rise test is under the same test conditions as in the first embodiment of the present invention. The test results are shown in FIG. From this result, the effect of the temperature reduction of the fourth embodiment can be obtained as a whole as compared with the conventional example and the first embodiment of the present invention.

(Fifth embodiment)
Next, a fully closed motor according to a fifth embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 9A, which is a longitudinal sectional view, and FIG. 9B, which is a front sectional view, the configuration of the present embodiment has a lattice-shaped configuration such as a partition plate in the internal space 23a of the cooling air passage 23. The lattice-shaped body 24 is provided so as to become a window toward the direction.

  According to the present embodiment, by providing the lattice-shaped body 24 in the cooling air passage 23, the lattice-shaped body 24 functions as a heat absorption fin and the heat absorption area is increased, so that the cooling performance of the circulating internal air by the cooler is improved. In addition, since the temperature rise of the motor can be reduced, the motor can be reduced in size and weight and / or output can be increased.

  10A, which is a longitudinal sectional view, and FIG. 10B, which is a front sectional view, are obtained by providing a lattice-shaped body 24 in the internal space 23a of the cooling air passage 23 in the same manner as described above. FIG. 11A is a longitudinal sectional view and FIG. 11B is a front sectional view showing an example of a configuration in which the passage 23 is not substantially fan-shaped. A partition plate is provided in the internal space 23a of the cooling air passage 23. An example of a configuration in which the cooling air passages 23 are not substantially fan-shaped as shown in FIG. Either configuration can provide sufficient cooling performance.

(Sixth embodiment)
Next, a fully closed motor according to a sixth embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 12 (a) which is a longitudinal sectional view and FIG. 12 (b) which is a front sectional view, the configuration of the present embodiment is a structure in which a honeycomb shaped body 24b is provided in an internal space 23a of a cooling air passage 23. It is.

  With this configuration, the mechanical rigidity of the cooler is increased, and the plate of the outer frame case of the cooler can be thinned, so that the weight can be reduced.

  Further, since the honeycomb-shaped body 24b is provided in the internal space 23a of the cooling air passage 23, the heat absorption area can be increased, the cooling performance of the circulating air cooler can be improved, and the temperature rise of the motor can be reduced. Therefore, it is possible to reduce the size and weight of the motor and / or increase the output.

  Further, in the configuration of the present embodiment, as shown in FIG. 13A which is a longitudinal sectional view and FIG. 13B which is a front sectional view, a corrugated body 24 c is provided in the internal space 23 a of the cooling air passage 23. As a result, the peak of the corrugated shape 23e does not overlap with the peak of the corrugated shape 23e, so that heat concentration as a heat-absorbing fin is alleviated and heat conduction is improved. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(Seventh embodiment)
Next, a fully-closed electric motor according to a seventh embodiment of the present invention will be described with reference to FIG. 14 (a), which is a longitudinal sectional view, and FIG. 14 (b), which shows details of interrupted heat absorption fins.

  As shown in FIG. 14, the above-described shape body in the internal space 23 a of the cooling air passage 23 is not provided, but instead, a divided endothermic body (interrupted endothermic fin) 24 d obtained by dividing the endothermic plate into a plurality of parts is provided. .

  As described above, since the divided heat absorber 24d is provided in the internal space 23a of the cooling air passage 23, the air is exchanged in the upper and lower stages of the wind flow, and heat transfer is improved by inducing turbulence. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(Eighth embodiment)
Next, a fully-closed electric motor according to an eighth embodiment of the present invention will be described with reference to FIG. 15 (a) which is a longitudinal sectional view and FIG. 15 (b) which shows details of a suction / blow-off heat absorption fin.

  As shown in FIG. 15, the configuration of the present embodiment does not provide the above-described shape body in the internal space 23a of the cooling air passage 23, and instead, a suction blowout heat absorber (suction) in which a large number of holes are formed in the corrugated plate. A blowout heat absorption fin) 24e is provided.

  As described above, since the suction blowout heat absorber 24e is provided in the internal space 23a of the cooling air passage 23, air is exchanged in the upper and lower stages of the flow, and heat transfer is improved by inducing turbulence. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(Ninth embodiment)
Next, a fully closed motor according to a ninth embodiment of the present invention will be described with reference to FIG. 16 (a) which is a longitudinal sectional view and FIG. 16 (b) which is a front sectional view.

  In the configuration of this embodiment, in the internal space 23a of the cooling air passage 23, for example, the lattice-shaped body 24f described above is divided into n equal parts in the radial direction and m equal parts in the circumferential direction so that the areas of the respective lattice windows are equal. To.

  With this configuration, the areas of the respective lattice windows in the internal space 23a of the cooling air passage 23 become equal, so that the flow of wind to the lattice windows becomes uniform. Therefore, the cooling performance is improved by the cooler of the circulating air, and the temperature rise of the motor can be reduced, so that the motor can be reduced in size and weight and / or increased in output.

(10th Embodiment)
Next, a fully closed motor according to a tenth embodiment of the present invention will be described with reference to FIG. 17A which is a longitudinal sectional view and FIG. 17B which is a front sectional view.

  In the configuration of the present embodiment, a grid-shaped configuration, for example, a grid-shaped body 24 is provided in the internal space 23 a of the cooling air passage 23 so as to be a window toward the ventilation direction, and a cross-sectional arc shape is formed at both ends of the grid-shaped body 24. The guide plate 19 is provided. In this case, when the grid partition plate in the cooling air passage 23 has n stages in the radial direction when viewed from the axial center of the motor, (n-1) guide plates 24 are provided at the entrance and exit of the grid. It is a thing.

  With this configuration, the air volume can be adjusted by the lattice window by providing the guide plate 24, and the air volume is uniform in any window. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(Eleventh embodiment)
Next, a fully closed motor according to an eleventh embodiment of the present invention will be described with reference to FIG. 18A which is a longitudinal sectional view and FIG. 18B which is a front sectional view.

  In the configuration of this embodiment, rectifying grids 25 are provided in the internal spaces 21 a and 22 a of the connection air passages 21 and 22 and in the vent holes 1 a and 1 b of the stator frame 1.

  With this configuration, the air volume is uniform in the internal space 23a of the cooling air passage 23 and also in the lattice window. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(Twelfth embodiment)
Next, a fully closed motor according to a twelfth embodiment of the present invention will be described with reference to FIG. 19A which is a longitudinal sectional view and FIG. 19B which is a front sectional view.

  The configuration of the present embodiment is an internal space of the connection air passages 21 and 22, which is one of a lattice shape, a honeycomb shape, a corrugated shape, and a corrugated plate on the air vent side of the stator frame 1 and the cooling air passage 23. Or what combined these arbitrarily is provided continuously.

  With this configuration, the lattice window of the internal space 23a of the cooling air passage 23 is also uniform. Therefore, the cooling performance of the circulating air cooler can be improved and the temperature rise of the electric motor can be reduced, so that the electric motor can be reduced in size and weight and / or increased in output.

(13th Embodiment)
Hereinafter, a fully-closed motor according to a thirteenth embodiment of the present invention will be described with reference to FIG. 20A which is a longitudinal sectional view and FIG.

  The configuration of this embodiment is such that the cooler 26 is as follows when viewed from the direction perpendicular to the axis. In the embodiment described above, the connection air passages 21 and 22 and the cooling air passage 23 are substantially U-shaped when viewed from the axial direction, but here the connection air passages 21 and 22 are viewed from the direction perpendicular to the axis. The cooling air passage 23 has a substantially arc shape. Then, when viewed from the direction perpendicular to the axis, the overall outer shape of the heat radiating fin 20 is a substantially partial circle.

  The operation of the fully-closed electric motor of the present embodiment configured as described above will be described below.

  As shown in FIG. 20, during operation of the electric motor, the air in the machine is blown up to the outer circumferential space in the radial direction of the circulation fan 11 by the rotation of the circulation fan 11, and then in the internal space 21a of the connection air passage 21 from the vent 1a. Then, the air flows through the internal space 23a of the cooling air passage 23 and flows into the in-flight space on the counter-drive side from the vent 1b through the internal space 23a of the connection air passage 23.

  Since the cooler is configured as described above, the loss of the air flow resistance in the machine due to the rotation of the circulation fan 11 is smaller than that of the right angle tube of the first embodiment. Since the heat is released, the cooling effect is further improved.

  The connection air passages 21 and 22 and the cooling air passage 23 are formed in a substantially circular arc shape, so that the hot air of the wind released by the centrifugal force from the inside air circulation fan is more cooled than the right angle tube of the first embodiment. Since the heat radiating fins 20 can be heated and effectively act on the outer peripheral surface of the cooling air passage 23 because it hits a wide area of the passage 23, the cooling efficiency of the heat radiation is good and the heat is released to the outside air. improves.

  Next, in order to confirm the effect of the present invention, a temperature rise test was performed on the prototype. The temperature rise test is performed at the rated speed of each operating speed, the power source is a sine wave power source, and simulated running wind (about 2 m / s) is aired around the main motor to simulate the effect of running the train. The test was carried out.

  The test results are shown in FIG. The scale on the vertical axis indicates the temperature increase ratio, and each measurement point is indicated on the horizontal axis.

From this result, compared with the conventional product and the first embodiment, an overall temperature reduction effect is seen, and particularly the temperature reduction of the rotor and the stator coil is large.

  By making the connection air passages 21 and 22 and the cooling air passage 23 substantially arc-shaped, the loss of flow resistance is smaller than that of the right-angle pipe of the first embodiment, and the vehicle drive of the present embodiment In the fully-closed electric motor, the cooling performance can be improved, so that the size and weight can be reduced or the output can be increased. Furthermore, since the cooler has no corners at right angles and has a gentle curve, cleaning maintenance can be reduced and manufacturing costs can be reduced.

(14th Embodiment)
Hereinafter, a fully closed motor according to a fourteenth embodiment of the present invention will be described with reference to FIG. 22 (a) which is a longitudinal sectional view and FIG. 22 (b) which is a front sectional view.

  In the configuration of this embodiment, the radius of curvature of the main board of the inside air circulation fan 11 is r, and the radius of the arc of the connection air passages 21 and 22 and the cooling air passage 23 is substantially r.

  Further, the outer peripheral wall surfaces of the connection air passage 21 and the cooling air passage 23 have a substantially partial circular outer shape as viewed from the direction perpendicular to the axis.

  The operation of the vehicle drive fully-closed electric motor of the present embodiment configured as described above will be described below.

  The connection air passages 21 and 22 and the cooling air passage 23 are formed in a substantially circular arc shape, the approximate curvature radius r of the main board of the internal air circulation fan 11 is set, and the connection air passage and the air passage are configured with a curvature radius r. Accordingly, since the loss of flow resistance is further reduced as compared with the bent pipe of the first embodiment, the cooling efficiency of heat dissipation is good and the heat is released to the outside air, so that the cooling action is further improved.

  Next, in order to confirm the effect of the present invention, a temperature rise test was performed on the prototype. The temperature rise test is performed at the rated speed of each operating speed, and the power source is a sine wave power source. Simulated wind (approx. 2 m / s) is sent around the main motor to simulate the effect of running the train. The test was conducted.

  The test results are shown in FIG. The scale on the vertical axis indicates the temperature increase ratio, and each measurement point is indicated on the horizontal axis. From this result, compared with the conventional product and the first embodiment, an overall temperature reduction effect is seen, and in particular, the temperature reduction of the rotor and the stator coil is large.

  In this way, the connection air passages 21 and 22 and the cooling air passage 23 are formed in a substantially arc shape on the basis of the center point with the approximate radius of curvature r of the main board of the inside air circulation fan 11 as a thirteenth embodiment. Compared to the curved pipe, the inlet connection air passage and the cooling air passage are curved pipes, so that the loss of the flow resistance is reduced, so that the maximum air volume of the circulation fan 11 can be obtained. As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

(Fifteenth embodiment)
Hereinafter, a fully closed motor according to a fifteenth embodiment of the present invention will be described with reference to FIG. 24 (a) which is a longitudinal sectional view and FIG. 24 (b) which is a front sectional view.

  The configuration of the present embodiment is a fully-closed electric motor in which the connection air passage 21 and the cooling air passage 23 are substantially arc-shaped when viewed from the direction perpendicular to the axis.

With this configuration, the connection air passage 21 and the cooling air passage 23 are formed in a substantially circular arc shape, so that the flow resistance loss is smaller than that of the thirteenth embodiment. Air volume is obtained.

  As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

(Sixteenth embodiment)
Hereinafter, a fully-closed electric motor according to a sixteenth embodiment of the present invention will be described with reference to FIG. 25A which is a longitudinal sectional view and FIG.

  The configuration of this embodiment is a fully-closed electric motor in which a part of the connection air passages 21 and 22 and the cooling air passage 23 are substantially arc-shaped when viewed from the direction perpendicular to the axis.

In this way, by forming a part of the connection air passages 21 and 22 and the cooling air passage 23 into a substantially circular arc shape, the loss of flow resistance is smaller than that in the fifteenth embodiment, so that the maximum air volume of the circulation fan 11 is obtained. It is done. As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

(17th Embodiment)
Hereinafter, a fully closed motor according to a seventeenth embodiment of the present invention will be described with reference to FIG. 26A which is a longitudinal sectional view and FIG.

  The configuration of the present embodiment is such that the approximate radius r of the main board of the internal air circulation fan 11 is set, and the approximate radius r ′ of the inner wall of the bearing bracket 4 that rotatably supports the rotor shaft 8 on the internal air circulation fan side is the main internal circulation fan. This is a fully-closed electric motor composed of about 1.2 to 1.4 times the approximate radius r of the panel. A plurality of rectifying grids 25 are provided on the inner wall surface of the cooling air passage 23.

  With this configuration, by configuring with the radius of curvature r of the inner wall of the bearing bracket, the flow resistance loss is smaller than that of the sixteenth embodiment, and thus the flow resistance loss is small. can get. As a result, the air flow characteristics are improved and the circulating air can be discharged to the outside air more efficiently, so that the cooling performance of the electric motor can be further improved.

(Eighteenth embodiment)
Hereinafter, a fully closed motor according to an eighteenth embodiment of the present invention will be described with reference to FIG. 27 (a) and FIG. 27 (b) which are longitudinal sectional views. This is a fully-closed electric motor in which the connection air passage 21 and the cooling air passage 23 are linearly inclined when viewed from the direction perpendicular to the axis.

  By configuring in this way, the loss of air flow resistance in the machine due to the rotation of the circulation fan 11 is smaller than in the first embodiment, so the cooling efficiency of heat dissipation is good and the heat is released to the outside air. The cooling effect is further improved.

(Nineteenth embodiment)
A fully closed motor according to a nineteenth embodiment of the present invention will be described below with reference to FIG. 28 (a), FIG. 28 (b) and FIG. 29, which are longitudinal sectional views.

  In the eighteenth embodiment described above, the motor is a fully-closed electric motor in which the inclination angle of the linearly inclined shape is approximately in the range of 30 degrees to 60 degrees when the reference axis is set with respect to the rotor shaft 8.

  As shown in FIG. 29, the result of the experiment using the angle of the oblique tube as a parameter is shown.

  From this result, the cooler 24 is a slanted tube, so that the loss of flow resistance of the in-machine air due to the rotation of the circulation fan 11 is smaller than that of the right angle tube of the first embodiment. Good, since the heat is released to the outside air, the cooling action is further improved. Of these, it is effective when the angle θ is in the range of approximately 30 to 60 degrees.

  The present invention is not limited to the above-described embodiments, but includes all the following configurations.

  1) The connection air passage and the cooling air passage may be substantially U-shaped when viewed from the axial direction, and the heat dissipation fin may be substantially fan-shaped when viewed from the axial direction.

  2) When viewed from the direction perpendicular to the axis, the connection air passage and the cooling air passage may be formed in a substantially arc shape, and the heat radiation fin may be combined in a substantially fan shape.

  3) When viewed from the direction perpendicular to the axis, the overall shape of the radiating fin is substantially rectangular or substantially circular, the connection air passage and the cooling air passage are substantially U-shaped, Any combination of the connection air passage and the cooling air passage having a substantially arc shape when viewed from a right angle direction may be used.

  4) When viewed from the direction perpendicular to the axis, at least one of the connection air passages has a substantially arc shape, the radiation fin has a substantially fan shape, and the overall shape of the radiation fin has a substantially rectangular shape or a substantially partial shape. Any combination with a circular shape may be used.

  5) The connection air passage or the connection air passage and the cooling air passage, as viewed from the direction perpendicular to the axis, have a linearly inclined shape and a radiating fin in a substantially fan shape, and the outer shape of the entire radiating fin. Any combination of the shape with a substantially rectangular shape or a substantially partial circular shape may be used.

  6) In the embodiment, the cylindrical shape of the cooling air passage 23 has been described by taking a rectangular shape as an example. However, the present invention is not limited to this, and is a combination of an elliptical shape, an oval shape, a deformed polygonal shape, and the like. Also good.

  7) The number of the connection air passages and the cooling air passages may be two or three instead of one.

  8) The radiating fins 20 formed on the outer peripheral surface of the cooling air passage 23 are not limited to the entire outer peripheral surface of the cooling air passage 23 but may be a part thereof.

  9) The external shape of each radiating fin 20 is not limited to that shown in the embodiment, and may be other shapes.

  Furthermore, the present invention can be variously modified without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, combined effects can be obtained. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted by omitting some constituent elements from all the constituent elements shown in the embodiment, when the extracted invention is implemented, the omitted part is appropriately supplemented by a well-known common technique. It is what is said.

The figure which shows the fully-closed electric motor of 1st Embodiment of this invention. The figure explaining the fluid flow of 1st Embodiment of this invention. The graph which shows the temperature reduction effect of 1st Embodiment of this invention. The figure which shows the fully-closed motor of 2nd Embodiment of this invention. The figure explaining the flow of the wind of the radial fan of 2nd Embodiment of this invention. The figure which shows the fully-closed electric motor of 3rd Embodiment of this invention. The figure which shows the fully-closed motor of 4th Embodiment of this invention. The graph which shows the temperature reduction effect of 4th Embodiment of this invention. The figure which shows the fully-closed electric motor of 5th Embodiment of this invention. The figure which shows the fully-closed electric motor of 5th Embodiment of this invention. The figure which shows the fully-closed electric motor of 5th Embodiment of this invention. The figure which shows the fully-closed motor of 6th Embodiment of this invention. The figure which shows the fully-closed motor of 6th Embodiment of this invention. The figure which shows the fully-closed electric motor of 7th Embodiment of this invention. The figure which shows the fully-closed electric motor of 8th Embodiment of this invention. The figure which shows the fully-closed electric motor of 9th Embodiment of this invention. The figure which shows the fully-closed electric motor of 10th Embodiment of this invention. The figure which shows the fully-closed electric motor of 11th Embodiment of this invention. The figure which shows the fully-closed motor of 12th Embodiment of this invention. The figure which shows the fully-closed motor of 13th Embodiment of this invention. The graph which shows the temperature reduction effect of 13th Embodiment of this invention. The figure which shows the fully-closed motor of 14th Embodiment of this invention. The graph which shows the temperature reduction effect of 14th Embodiment of this invention. The figure which shows the fully-closed motor of 15th Embodiment of this invention. The figure which shows the fully-closed electric motor of 16th Embodiment of this invention. The figure which shows the fully-closed motor of 17th Embodiment of this invention. The figure which shows the fully-closed motor of 18th Embodiment of this invention. The figure which shows the fully-closed motor of 19th Embodiment of this invention. The figure for demonstrating the cooling effect | action at the time of using the cooler of 19th Embodiment of this invention as an oblique pipe. The figure which shows the fully-closed electric motor of a prior art example. The figure explaining the fluid flow in the fully-closed electric motor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stator frame, 1c ... Arm, 1a ... Vent, 1b ... Vent, 2 ... Stator iron core, 2a ... Ventilation path, 3 ... Stator coil, 4 ... Bearing bracket, 5 ... Bearing housing, 6, 7 ... Bearing, 8 ... Rotor shaft, 9 ... Rotor core, 9a ... Rotor ventilation hole,
DESCRIPTION OF SYMBOLS 10 ... Rotor bar, 11 ... Inside air circulation fan, 12, 13 ... Connection cooling air passage, 12a ... Inlet passage, 13a ... Exhaust passage, 14 ... Pipe, 14a ... Ventilation path, 19 ... Guide plate, 21, 22 ... Connection air Road, 21a, 22a ... internal space, 23 ... cooling air passage, 23a ... internal space, 24 ... lattice shaped body, 24a ... vertical lattice shaped body, 24b ... honeycomb shaped body, 24c ... corrugated shaped body, 24d ... divided endothermic body 24e ... endothermic body, 24f ... lattice-shaped body, 25 ... rectifying grid, 100 ... bogie frame, 101 ... axle, 102 ... wheel, 103 ... rail.

Claims (20)

A plurality of rotor ventilation holes are formed on the inner peripheral side of the rotor core, an internal air circulation fan is provided at one end of the rotor shaft inside the machine, openings are provided at both ends of the stator frame, and the stator frame is cooled outside the machine. In the fully-closed electric motor that cools the internal space of the cooler by communicating the internal space of the cooler with the openings at both ends of the stator frame and circulating and circulating the air in the cooler,
Connection air passages are respectively provided outside the openings at both ends of the stator frame, a cylindrical cooling air passage having a surface is disposed between the connection air passages, and one end of each internal space of the connection air passages The stator frame communicates with the interior space through the opening of the stator frame, the other ends communicate with the internal space of the cooling air passage, and a plurality of heat radiation fins are provided on the outer peripheral wall of the cooling air passage. Fully closed electric motor.   The fully-closed electric motor according to claim 1, wherein the connecting air passage, the cooling air passage, and the radiating fin are substantially fan-shaped when viewed from the axial direction.   The opening angle at both ends of the stator frame and the inlet angle of the connection air passage are made to coincide with the blade pitch angle of the inside-air circulation fan or an integral multiple of the angle when viewed from the axial direction. Item 3. A fully-closed electric motor according to item 2.   The fully-closed electric motor according to claim 3, wherein the rotor ventilation hole is disposed substantially at the center between the blades of the inside-air circulation fan as viewed from the axial direction.   The fully-closed electric motor according to claim 1, wherein the ventilation path of the cooling air passage has a lattice configuration toward the ventilation direction.   The fully-closed electric motor according to claim 5, wherein the ventilation path of the cooling air passage has a honeycomb shape configuration, a corrugated shape, or a corrugated shape toward the ventilation direction.   The fully-closed electric motor according to claim 5, wherein the ventilation path of the cooling air passage is configured to be provided with interruption heat absorption fins toward the ventilation direction.   The fully-closed electric motor according to claim 5, wherein the ventilation path of the cooling air passage is configured to be provided with a suction blow-off heat absorption fin so as to become a window toward the ventilation direction.   6. The fully-closed electric motor according to claim 5, wherein, in the lattice configuration, each lattice window is divided into n equal parts in the radial direction and the circumferential direction and m equally divided in the circumferential direction when viewed from the axial direction.   In the lattice configuration, when the partition plate of the lattice is n steps in the radial direction when viewed from the axial center, (n-1) guide plates are further provided at the entrance of the lattice window. Item 6. A fully-closed electric motor according to item 5.   The fully-closed electric motor according to claim 1, wherein a rectifying grid is provided at an inlet of the connection air passage.   One of a lattice shape configuration, a honeycomb shape configuration, a corrugated shape configuration, and a corrugated plate configuration is continuously provided from the inlet of the connection air passage to the exit of the connection air passage through the cooling air passage. The fully-closed electric motor according to any one of claims 6 to 8.   The fully-closed electric motor according to claim 1 or 2, wherein the connection air passage and the cooling air passage are substantially U-shaped when viewed from the axial direction.   The fully-closed electric motor according to claim 1 or 2, wherein the connection air passage and the cooling air passage are substantially arc-shaped when viewed from a direction perpendicular to the axis. 14. The entire shape according to claim 1, wherein the outer shape of the entire heat dissipating fin is a substantially rectangular shape or a substantially partial circle shape when viewed from a direction perpendicular to the axis. Closed motor.   14. The fully-closed electric motor according to claim 13, wherein a radius of curvature of the main board of the inside air circulation fan is r, and a radius of an arc of the connection air passage and the cooling air passage is substantially r.   The fully-closed electric motor according to claim 1, wherein at least one of the connection air passages has a substantially arc shape when viewed from a direction perpendicular to the axis.   An approximate radius r of the main plate of the internal air circulation fan is set, and an approximate radius r ′ of the inner wall of the bearing bracket that rotatably supports the rotor shaft on the internal air circulation fan side is approximately 1.2 of the approximate radius r of the internal air circulation fan main plate. The fully-closed electric motor according to claim 1, wherein the fully-closed electric motor is configured to be double to 1.4 times.   The fully-closed electric motor according to claim 1 or 2, wherein the connection air passage or the connection air passage and the cooling air passage are linearly inclined when viewed from a direction perpendicular to the axis.   20. The fully-closed electric motor according to claim 19, wherein an inclination angle of the linear inclined shape is in a range of approximately 30 degrees to 60 degrees when a reference axis is set with respect to the rotor shaft.

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