JP2010098791A - Totally enclosed rotary electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a totally enclosed rotary electric motor that efficiently cools its inside and also reduces noise. <P>SOLUTION: The rotary electric motor includes: a stator core 1; a case, which has first brackets 8 and 9 and second brackets 12 and 13 fixed to the sides of both axial ends of the stator core and is sealed; the first bearing 7, which is attached to the first bracket on the side of one end of the stator core; the second bearing 11, which is attached to the second bracket on the side of the other end of the stator core; a rotating shaft 4, which is rotatably supported by the first and second bearings and extends within the case; a rotor core 2, which is attached to the rotating shaft and is provided on the inner perimetrical side of the stator core; a ventilating fan 5, which is attached, between the first bearing and the rotor core, to the rotating shaft and can rotate in a body with the rotating shaft; an intake port 8a, which is formed, in the vicinity of the first bearing, in the first bracket; and an outside air current path 15, which leads outside air sucked from the intake port to the side of the second bearing from the side of the first bearing by the rotation of the ventilating fan. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary electric motor, and more particularly to a fully-closed rotary electric motor in which a ventilation fan is provided in the body.

  For example, a drive device for a railway vehicle includes a main motor installed in a carriage near a wheel, and a control device that drives these main motors. The output shaft of the main motor is connected to the wheel via a gear train and drives the wheel.

  In recent years, permanent magnet synchronous rotary motors have come to be applied as main motors due to advances in technology for improving magnet performance and magnetic flux density. For example, an inner rotor type rotary electric motor generally includes a cylindrical rotor core attached to a rotating shaft and a stator core disposed outside the rotor core. The stator core is fixed to a bracket that covers both ends of the rotating shaft. Further, both end portions of the rotating shaft are rotatably supported by bearings provided on the brackets. Grease is used to lubricate the bearings.

  Since a rotary electric motor for a railway vehicle is mounted on a carriage, it is often exposed to foreign matters such as dust, rain, and snow depending on various external environments. For this reason, the rotary motor needs periodic maintenance with disassembly, and it is recommended to clean the inside of the machine contaminated by foreign matter from the outside.

  On the other hand, there is an increasing need for a rotary electric motor having an extended maintenance cycle, that is, a high maintenance efficiency. In order to satisfy such needs, a fully-closed rotary electric motor that prevents entry of foreign matter from the outside has been proposed (for example, Patent Document 1). Such a hermetic rotary motor can prevent foreign matter from entering from the outside, and can extend the maintenance cycle.

This fully-closed rotary electric motor has two ventilation fans attached to the driving side end and the non-driving side end of the rotating shaft, respectively, and these ventilation fans are located inside the bracket, that is, inside the body. Is provided. Both of the bearings are cooled by using the cooling air taken from outside the airframe by these ventilation fans, and at the same time, the cooling air is discharged along the outer surface of the airframe to cool the inside of the electric motor generated by the stator coil and the rotor bar. Further, the air in the machine is circulated and circulated from the blades installed on the inner side of one of the ventilation fans, thereby suppressing heat generation in the motor and the bearing. Such a fully-closed rotary electric motor is difficult to take dust and the like into the machine, and can be used for a long period of time with less maintenance.
JP 2006-25521 A

  In the above-described fully-closed rotary motor, the effect of reducing the temperature rise in the bearing and the motor can be expected, but the wind noise generated by the ventilation fans provided at both ends of the rotary shaft and the generated wind are The bead sound that hits the cooling fins provided in the case is generated as noise. Moreover, the blade | wing of the ventilation fan provided in the counter drive side end cannot be enlarged on the structure of an electric motor. For this reason, the bearing portion on the non-driving side end is not sufficiently cooled, and the temperature rises more remarkably than the bearing portion on the driving end side, and the expected cooling effect is not obtained.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a fully-closed rotary electric motor capable of efficiently cooling the inside of the machine and reducing noise.

  A fully-closed rotary electric motor according to an aspect of the present invention includes a stator iron core, a first bracket fixed to one axial end of the stator iron core, and a second bracket fixed to the other axial end of the stator iron core. A sealed case, a first bearing attached to the first bracket at one end of the stator core, a second bearing attached to the second bracket at the other end of the stator core, A rotary shaft that is rotatably supported by the first bearing and the second bearing and extends in the case; a rotor core attached to the rotary shaft and provided on an inner peripheral side of the stator core; and the first bearing; A ventilation fan attached to the rotating shaft between the rotor core and rotatable integrally with the rotating shaft, an air inlet formed in the first bracket in the vicinity of the first bearing, and the ventilation fan Rotation of emissions, and a, and the outside air flow path for guiding the second bearing side outside air inlet from the first bearing side from the intake port.

  According to this aspect of the present invention, it is possible to obtain a fully-closed rotary electric motor that can efficiently cool the inside of the machine and reduce noise.

  Hereinafter, a fully closed rotary electric motor according to an embodiment of the present invention will be described in detail with reference to the drawings.

  First, a railway vehicle equipped with a rotating motor will be described. FIG. 7 schematically shows a railway vehicle. The railway vehicle includes a pair of bogie frames 52 each provided with wheels 50, and a vehicle 55 supported on the bogie frame via an air spring 54. On each bogie frame 52, a rotary motor 10 that functions as a main motor is placed in the vicinity of the wheel 50. The rotary electric motor 10 is connected so that rotational force can be transmitted to the wheels 50 via a coupling and a gear box (not shown). The wheel 50 is placed on the rail 51. A structure including the wheels 50, the carriage frame 52, and the air spring 54 is collectively referred to as a carriage.

  A pantograph 57 is provided on the ceiling side of the vehicle 55, and this panda graph is in contact with the overhead wire 58. The electric power supplied from the overhead line 58 to the pantograph 57 is supplied to a control device (not shown). Electric power is converted from direct current to alternating current by the control device, and is supplied to each rotary motor 10 through a wiring (not shown). The rotary electric motor 10 is operated by the supplied electric power, and rotates the wheel 50 through the coupling and the gear box. As a result, the vehicle 55 travels on the rail 51.

Next, a fully closed type rotary electric motor according to an embodiment of the present invention will be described.
FIG. 1 is a front view of a fully-enclosed rotary motor 10 according to the first embodiment, FIG. 2 is a cross-sectional view of the rotary motor along the line OA in FIG. 1, and FIG. It is sectional drawing of the rotary electric motor along OB.

  As shown in FIGS. 1 and 2, a fully-closed rotary electric motor 10 includes a cylindrical stator core 1 and a pair of annular core pressers 3 a and 3 b fixed to both end surfaces of the stator core 1. is doing. A first outer peripheral bracket 9 is attached to the iron core retainer 3 a located on the drive end side of the stator iron core 1. The 1st outer periphery bracket 9 is formed in a double structure, and the ventilation path 9f is comprised in the inside. A first inner peripheral bracket 8 is fastened with bolts on the inner peripheral side of the first outer peripheral bracket 9. A first bearing 7 is built in the central portion of the first inner peripheral bracket 8. The first outer peripheral bracket 9 and the first inner peripheral bracket 8 constitute a first bracket in the present invention.

  A second outer peripheral bracket 13 is attached to the iron core retainer 3 b located on the side opposite to the driving end of the stator iron core 1. A second inner peripheral bracket (housing) 12 is fastened to the inner peripheral side of the second outer peripheral bracket 13 with a bolt. A second bearing 11 is built in the center of the second inner peripheral bracket 12. The stator core 1, the first outer peripheral bracket 9, the first inner peripheral bracket 8, the second outer peripheral bracket 13, and the second inner peripheral bracket 12 constitute a machine body whose inside is sealed. The second outer peripheral bracket 13 and the second inner peripheral bracket 12 constitute a second bracket in the present invention.

  The stator core 1 is configured by laminating a large number of annular metal plates made of a magnetic material, for example, a silicon steel plate. A plurality of slots extending in the axial direction are formed in the inner peripheral portion of the stator core 1, and a stator coil 17 is embedded in these slots. The coil ends of the stator coil 17 protrude from the both end surfaces of the stator core 1 in the axial direction. A plurality of ventilation holes 1a are formed in the outer peripheral portion of the stator iron core 1 and the iron core retainers 3a and 3b. Each ventilation hole 1 a extends along the axial direction of the stator core 1 through the outer peripheral portion of the stator core 1 and the core holders 3 a and 3 b. The stator iron core 1 and the stator coil 17 constitute a stator.

  A cylindrical rotor core 2 is coaxially disposed on the inner diameter side of the stator core 1 with a gap. A rotating shaft 4 is attached to the center portion of the rotor core 2, and both end portions thereof are rotatably supported by a first bearing 7 and a second bearing 11. Thereby, the rotating shaft 4 extends coaxially in the case. The drive side end 4a of the rotating shaft 4 extends outside the machine, and a joint for connecting the drive gear device is attached to this portion.

  The rotor core 2 is configured by laminating a large number of annular metal plates made of a magnetic material, for example, a silicon steel plate. The rotor iron core 2 is supported by a pair of iron core pressers 2a and 2b attached to the rotary shaft 4 so as to be sandwiched from both side surfaces in the axial direction. The iron core holding plates 2 a and 2 b are formed in an annular shape, and the outer diameter thereof is slightly smaller than the outer diameter of the rotor iron core 2.

A plurality of grooves extending in the axial direction are formed on the outer peripheral portion of the rotor core 2, and a rotor bar 6 is embedded in each groove. Both end portions of the rotor bar 6 project from the rotor core 2, and the projecting portions are integrally connected by an end ring to form a squirrel-cage rotor of an induction motor. A plurality of ventilation holes 2c penetrating in the axial direction of the rotor core 2 are formed in the inner peripheral portion of the rotor core 2 and the iron core retainers 2a and 2b.
By energizing the stator coil 17, the rotor core 2 is guided and rotated, and the rotating shaft 4 is rotated integrally with the rotor core 2.

  A ventilation fan 5 is attached to the rotary shaft 4 between the first bearing 7 on the drive end side and the rotor core 2 so as to be rotatable integrally with the rotary shaft 4. The ventilation fan 5 has a disk-shaped main plate 5d curved along the inner surface of the first inner peripheral bracket 8, and the outer peripheral edge of the main plate 5d and the inner periphery of the overhanging portion inside the machine of the first outer peripheral bracket 9. The parts are engaged with each other with a circumferential minute gap. The circumferential minute gaps are formed in a two-stage structure as irregular shapes.

  A plurality of first blades 5a for blowing air are radially provided on a wall surface outside the machine of the main plate 5d. A plurality of second air blowing blades 5b are provided radially on the inner surface of the main plate 5d, that is, on the wall surface of the stator core, and an annular side plate 5c is fixed to the extended end of the second blade. It faces 5d with a gap.

  A plurality of arc-shaped intake ports 8a are formed on the wall surface of the first inner peripheral bracket 8 and are arranged at intervals in the circumferential direction. The air inlet 8 a opens in a space defined between the inner surface of the first inner peripheral bracket 8 and the ventilation fan 5, and this space communicates with the air passage 9 f in the first outer peripheral bracket 9. A plurality of ventilation holes 9a are formed in the first outer peripheral bracket 9, and the ventilation path 9f communicates with the ventilation holes 1a of the stator core 1 through these ventilation holes 9a.

  A disc-shaped partition plate 18 is attached to the rotating shaft 4 between the second bearing 11 on the counter driving end side and the rotor core 2 so as to be rotatable integrally with the rotating shaft 4. The outer peripheral edge portion of the partition plate 18 and the inner peripheral portion of the overhanging portion on the machine inner side of the second outer peripheral bracket 13 are engaged with each other with a circumferential minute gap. The circumferential minute gaps are formed in a two-stage structure as irregular shapes. And between the partition plate 18 and the 2nd inner peripheral bracket 12, the ventilation path 12a partitioned from the inside of an apparatus is prescribed | regulated.

  A plurality of vent holes 13c and a plurality of vent holes 13d are formed in the second inner peripheral bracket 12 and communicated with the ventilation path 12a. The vent hole 13d is open to the outside air, and the vent hole 13c communicates with a ventilation duct described later. A plurality of exhaust holes 13a are formed in the outer peripheral edge of the second outer peripheral bracket 13 and are open to the outside air. The exhaust holes 13a are arranged apart from each other along the circumferential direction of the second outer peripheral bracket 13, and communicate with the ventilation holes 1a formed in the stator iron core 1 and the iron core retainer 3b, respectively.

  As shown in FIGS. 1 and 2, a ventilation duct 16 extending from the first outer peripheral bracket 9 to the vent hole 13 c through the outside of the stator core 1 and the second outer peripheral bracket 13 is provided. The ventilation duct 16 forms an external airflow passage 15. One end of the external air flow passage 15 communicates with the ventilation path 9f through an opening 9d formed in the first outer peripheral bracket 9, and the other end is provided on the second bearing 11 side via a plurality of, for example, two vent holes 13c. It communicates with the ventilation path 12a.

  As shown in FIGS. 1 and 3, the rotary electric motor 10 includes a heat exchanger (heat radiator) 14 formed on the outer peripheral portion of the stator core 1. The heat exchanger 14 has a plurality of heat radiating fins 14 a, and these heat radiating fins 14 a are formed by extending a part of a metal plate constituting the stator core 1 to the outer peripheral side.

  The rotary electric motor 10 has an inside air circulation passage 20 that circulates air in the case through the heat exchanger 14. The inside air circulation flow path 20 includes a first communication duct 21 extending from the first outer peripheral bracket 9 to the heat exchanger 14, a second communication duct 22 extending from the heat exchanger 14 to the second outer peripheral bracket 13, and a heat exchanger. 14 is formed by a third communication duct 23 that extends through the interior of 14.

  On the outer peripheral side of the second blade 5b of the ventilation fan 5, a cover plate 9b integrated with the first outer peripheral bracket 9 is provided to cover the entire circumference of the second blade 5b of the ventilation fan. An opening 9c is formed in a part of the cover plate 9b. One end of the inside air circulation channel formed by the first communication duct 21 communicates with the opening 9c. The other end of the first communication duct 21 communicates with the third communication duct 23. One end of the second communication duct 22 communicates with the third communication duct 23, and the other end communicates with the interior of the machine through an opening 13 e formed in the second outer peripheral bracket 13.

  In the rotary electric motor 10 configured as described above, a plurality of bases for attaching the rotary electric motor 10 to the carriage frame 52 and an attachment base for connecting to other devices are provided on the outer surface of the case.

Next, the operation and effect of the fully closed rotary electric motor 10 according to the first embodiment configured as described above will be described below.
During operation, the stator motor 17 and the rotor bar 6 generate heat in the rotary electric motor 10, and this heat is transmitted to each part in the electric motor, and the temperature rises. Further, the ventilation fan 5 provided at the drive side end of the rotary electric motor 10 rotates integrally with the rotary shaft 4. As shown in FIGS. 1 and 2, when the ventilation fan 5 rotates, the outside air is sucked into the first inner peripheral bracket 8 by the discharge action of the first blade 5 a provided on the first inner peripheral bracket 8 side. It flows into the case from the opening 8a, here, into the ventilation path 9f. The flowing outside air, that is, the cooling air cools the first bearing 7 via the ventilation fan 5 and the first inner peripheral bracket 8. A part of the cooling air flows into the external airflow passage 15 from the ventilation passage 9f through the opening 9d, flows through the external airflow passage 15, and then passes through the vent hole 13c to the second inner peripheral bracket 12 and the partition plate 18. It flows into the ventilation path 12a between. The cooling air cools the second inner peripheral bracket 12, the partition plate 18, and the second bearing 11, and then is exhausted from the vent hole 13d to the outside as indicated by an arrow c.

  In this way, the first and second inner peripheral brackets 8 and 12 are cooled by the outside air introduced from the intake port 8a, and the temperature of the built-in first and second bearings 7 and 11 decreases. Further, the heat transmitted from the rotating shaft 4 to the first and second bearings 7 and 11 is prevented from being conducted at this portion because the ventilation fan 5 functions as a heat radiating body. , 11 is decreased. As described above, the temperature of the first and second bearings 7 and 11 decreases, so that the life of the lubricating grease is extended, and the disassembly maintenance cycle for maintenance can be extended. Therefore, it is possible to save labor for maintenance.

  In addition, the other part of the cooling air sent to the ventilation path 9f by the ventilation fan 5 flows into the ventilation hole 1a formed in the stator core 1 from the ventilation hole 9a, and flows through the ventilation hole 1a, and then the exhaust hole. The air is exhausted from 13a. Thus, the heat generated by the stator coil 5 is radiated from the inner peripheral surface of the ventilation hole 1a to the cooling air via the stator core 1, and the stator core 1 and the stator coil 17 are cooled. As described above, the vent hole 9a and the vent hole 1a constitute a second external airflow passage that branches from the external airflow passage 15 and allows the outside air to flow.

  On the other hand, when the ventilation fan 5 rotates, the in-machine air (inside air) circulates and circulates in the in-machine space by the second blade 5b provided on the inside of the machine. That is, as shown in FIG. 3, after the inside air is blown out to the outer peripheral side of the ventilation fan 5 by the second blade 5 b and sent to the inside air circulation channel 20 through the opening 9 c, The air flows from the vent hole 13c into the in-flight space on the non-driving side. While flowing through the inside air circulation flow path 20, the inside air flows through the heat exchanger 14, and the heat of the inside air is released to the outside air by a large number of heat radiation fins 14a. As a result, the circulating inside air is cooled and then sent into the machine.

  The cooled inside air flows through the ventilation holes 2 c provided in the rotor core 2 and the gap between the stator core 1 and the rotor core 2 in the machine, and passes through the inside of the machine heated by the heat generated by the rotor bar 6 and the stator coil 17. After cooling, it returns to the blade 5b side of the ventilation fan 5. In this way, the inside air circulates through the inside air circulation channel 20 and the inside of the case.

Thus, according to the fully closed type rotary electric motor 10 which concerns on this embodiment, the invasion of a foreign material can be prevented by using a sealed structure. A single ventilation fan provided at the driving side end introduces outside air to cool the first bearing side, and guides the introduced outside air to the non-driving side end through the outside air flow passage to cool the second bearing side. it can. The cooling air can be passed to the non-driving side while being cooled without being affected by the heat in the electric motor. As a result, the first and second bearings can be efficiently cooled, the reliability of the rotary motor can be improved, and maintenance efficiency can be realized. At the same time, the ventilation fan on the non-drive side can be eliminated, noise such as wind noise and bead noise caused by the ventilation fan can be reduced, and the axial dimension of the rotary motor can be reduced. Moreover, the cooling performance in the machine can be improved by cooling the air circulating in the inside air with a heat exchanger and supplying the air as cooling air into the machine.
From the above, it is possible to obtain a fully-closed rotary electric motor that can efficiently cool the inside of the machine and reduce noise.

Next, a fully closed rotary electric motor according to a second embodiment of the present invention will be described. Note that in the second embodiment, the same or similar parts as those in the first embodiment described above are denoted by the same reference numerals, and duplicate descriptions are partially omitted.
4 is a front view of the fully-closed rotary electric motor 10 according to the second embodiment, FIG. 5 is a cross-sectional view of the rotary electric motor along the line OC in FIG. 4, and FIG. 6 is a line O in FIG. It is sectional drawing of the rotary electric motor along -D.

  As shown in FIGS. 4 and 5, according to the fully-closed rotary electric motor 10, a portion extending from the first outer peripheral bracket 9 to the outer periphery of the stator core 1 in the ventilation duct forming the outer airflow passage is omitted. One or a plurality of ventilation ducts 16 are provided only outside the second outer peripheral bracket 13. One end of each ventilation duct 16 communicates with one or a plurality of exhaust holes 13 a on the side opposite to the driving end of the stator core 1, and the other end has a plurality of, for example, two passages formed in the second outer peripheral bracket 13. It communicates with the ventilation path 12a on the second bearing 11 side through the air holes 13c. The outer airflow passage 15 includes a ventilation path 9f formed in the first outer peripheral bracket 9 and the first inner peripheral bracket 8, a vent hole 9a, a vent hole 1a formed through the stator core 1, an exhaust hole 13a, a vent hole. The duct 16, the vent hole 13 c, and the ventilation path 12 a formed in the second outer peripheral bracket 13 are formed.

  As shown in FIGS. 4 and 6, the rotary electric motor 10 has a heat exchanger 14 formed on the outer peripheral portion of the stator core 1 and an internal air circulation passage 20 that circulates air in the case through the heat exchanger 14. is doing. The inside air circulation flow path 20 includes a first communication duct 21 extending from the first outer peripheral bracket 9 to the heat exchanger 14, a second communication duct 22 extending from the heat exchanger 14 to the second outer peripheral bracket 13, and the heat exchanger 14. It is formed by a third communication duct 23 extending through the inside.

  On the outer peripheral side of the second blade 5b of the ventilation fan 5, a cover plate 9b integrated with the first outer peripheral bracket 9 is provided to cover the entire circumference of the second blade 5b of the ventilation fan. An opening 9c is formed in a part of the cover plate 9b. One end of the inside air circulation channel formed by the first communication duct 21 communicates with the opening 9c. The other end of the first communication duct 21 communicates with the third communication duct 23. One end of the second communication duct 22 communicates with the third communication duct 23, and the other end communicates with the interior of the machine through an opening 13 e formed in the second outer peripheral bracket 13.

  According to the fully-closed rotary electric motor 10 according to the second embodiment configured as described above, when the ventilation fan 5 rotates during operation, due to the discharge action of the first blade 5a provided on the first bracket side. The outside air flows from the intake port 8a provided in the first inner peripheral bracket 8 into the case, here, the ventilation path 9f. The flowing cooling air cools the first bearing 7 via the ventilation fan 5 and the first inner peripheral bracket 8. A part of the cooling air flows into the ventilation hole 1a of the stator core 1 from the ventilation path 9f through the ventilation hole 9a, flows through the ventilation hole 1a, and then flows into the ventilation duct 16 from the exhaust hole 13a. Furthermore, after the cooling air flows through the ventilation duct 16, the cooling air flows into the ventilation path 12 a between the second inner peripheral bracket 12 and the partition plate 18 from the vent hole 13 c. The cooling air cools the second inner peripheral bracket 12, the partition plate 18, and the second bearing 11, and then is exhausted from the vent hole 13d to the outside as indicated by an arrow c.

  In addition, the other part of the cooling air sent to the ventilation path 9f by the ventilation fan 5 flows into the ventilation hole 1a formed in the stator core 1 from the ventilation hole 9a, and flows through the ventilation hole 1a, and then the exhaust hole. The air is exhausted from 13a. Thus, the heat generated by the stator coil 5 is radiated from the inner peripheral surface of the ventilation hole 1a to the cooling air via the stator core 1, and the stator core 1 and the stator coil 17 are cooled.

  On the other hand, when the ventilation fan 5 rotates, the in-machine air (inside air) circulates and circulates in the in-machine space by the second blade 5b provided on the inside of the machine. As shown in FIG. 6, the inside air is blown out to the outer peripheral side of the ventilation fan 5 by the second blade 5 b, sent from the opening 9 c to the inside air circulation passage 20, and after flowing through the inside air circulation passage 20, 13c flows into the in-flight space on the opposite drive side. While flowing through the inside air circulation flow path 20, the inside air flows through the heat exchanger 14, and the heat of the inside air is released to the outside air by a large number of heat radiation fins 14a. As a result, the circulating inside air is cooled and then sent into the machine.

  The cooled inside air flows through the ventilation holes 2 c provided in the rotor core 2 and the gap between the stator core 1 and the rotor core 2 in the machine, and passes through the inside of the machine heated by the heat generated by the rotor bar 6 and the stator coil 17. After cooling, it returns to the blade 5b side of the ventilation fan 5. In this way, the inside air circulates through the inside air circulation channel 20 and the inside of the case.

  According to the rotary electric motor according to the second embodiment configured as described above, the airframe can be efficiently cooled and noise can be reduced, as in the first embodiment described above. According to this embodiment, the second bearing 11 on the non-driving side is cooled by the air after cooling the stator core 1. Therefore, although the cooling performance is inferior to that of the first embodiment, it is not necessary to configure a complicated ventilation path on the outer peripheral side of the rotary electric motor 10, and the structure can be simplified and the radial dimension can be reduced.

  The present invention is not limited to the above-described embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. Some constituent elements may be deleted from all the constituent elements shown in the embodiments, or constituent elements over different embodiments may be appropriately combined.

  The rotary motor according to the present invention is not limited to a motor for a railway vehicle, and can be applied to various rotary motors such as an automobile motor, an industrial motor, and a generator. The material, dimensions, and the like of the constituent elements of the rotary motor are not limited to the above-described embodiments, and can be variously selected as necessary.

FIG. 1 is a front view showing a fully-closed rotary electric motor according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the rotary motor taken along line OA in FIG. FIG. 3 is a longitudinal sectional view of the rotary motor taken along line OB in FIG. 1. FIG. 4 is a front view of a fully-closed rotary electric motor according to a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view of the rotary motor taken along line O-C in FIG. 4. FIG. 6 is a longitudinal sectional view of the rotary motor taken along line OD in FIG. 4. FIG. 7 is a side view showing a railway vehicle equipped with a rotary electric motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stator iron core, 1a ... Vent hole, 2 ... Rotor iron core, 4 ... Rotary shaft, 5 ... Ventilation fan,
5a ... 1st blade | wing, 5b ... 2nd blade | wing, 7 ... 1st bearing, 8 ... 1st inner peripheral bracket,
8a ... intake port, 9 ... first outer peripheral bracket, 10 ... rotary motor, 11 ... second bearing,
12 ... 2nd inner periphery bracket, 13 ... 2nd outer periphery bracket, 14 ... Heat exchanger,
14a ... radiating fins, 15 ... outer air passage, 16 ... ventilation duct, 20 ... inside air circulation channel,
21 ... 1st communication duct, 22 ... 2nd communication duct,

Claims (9)

The stator core,
A sealed case having a first bracket fixed to one axial end of the stator core and a second bracket fixed to the other axial end of the stator core;
A first bearing attached to the first bracket at one end of the stator core;
A second bearing attached to the second bracket on the other end side of the stator core;
A rotary shaft that is rotatably supported by the first bearing and the second bearing and extends in the case;
A rotor core attached to the rotary shaft and provided on the inner peripheral side of the stator core;
A ventilation fan attached to the rotary shaft between the first bearing and the rotor iron core and rotatable integrally with the rotary shaft;
An air inlet formed in the first bracket in the vicinity of the first bearing;
An external airflow passage that guides outside air sucked from the air intake port from the first bearing side to the second bearing side by rotation of the ventilation fan;
Fully enclosed rotary electric motor with   2. The fully closed structure according to claim 1, further comprising a ventilation duct extending from the first bracket to the vicinity of the second bearing through the outside of the stator iron core and the outside of the second bracket and forming the external airflow passage. Type rotary motor.   The fully-closed rotary electric motor according to claim 2, further comprising a second external airflow passage branched from the external airflow passage and extending from one end side to the other end side of the stator iron core through the stator iron core. A ventilation duct extending from the stator core to the vicinity of the second bearing through the outside of the second bracket;
2. The all-out air flow passage according to claim 1, wherein the external airflow passage is formed by a ventilation path that extends from the intake port through the first bracket, a ventilation hole that extends through the stator iron core, and the ventilation duct. Closed rotary motor. A heat exchanger provided on the outer peripheral side of the stator core;
An internal air circulation passage extending from the first bracket to the second bracket through the heat exchanger and circulating the air in the case through the heat exchanger by rotation of the ventilation fan. Item 5. The fully-closed rotary electric motor according to any one of items 1 to 4.   The fully-closed rotary electric motor according to claim 5, wherein the heat exchanger has a heat radiation fin formed by a part of the stator iron core.   A first communication duct extending from the first bracket to the heat exchanger; a second communication duct extending from the heat exchanger to the second bracket; a third communication duct extending through the heat exchanger; The fully-closed rotary electric motor according to claim 6, wherein the inside air circulation flow path is formed by the first communication duct, the second communication duct, and the third communication duct.   The ventilation fan includes a disk-shaped main plate fixed to the rotating shaft, a plurality of first blades provided on a wall surface of the main plate on the external airflow passage side, and a plurality of airflow fans provided on a wall surface on the machine inner side of the main plate. The fully-closed rotary electric motor according to any one of claims 1 to 7, further comprising:   9. The partition plate according to claim 1, further comprising a partition plate that is attached to the rotating shaft between the second bearing and the rotor iron core and partitions the inside of the case and the external airflow passage. Fully closed rotary motor.

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