JP2011205894A - Fully enclosed motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fully enclosed motor for driving a vehicle which improves a cooling performance, is miniaturized and is lightened without circulating the air in the motor.SOLUTION: The fully enclosed motor having a stator frame, a stator core provided in an inner peripheral face of the stator frame and a rotor core mounted on a rotor shaft in the motor and provided with a structure for the air not to flow into the motor includes first and second brackets which are mounted on both ends of the stator frame and form a channel of the air between the brackets and the motor, a first member which is mounted on one face of the rotor core and has a ventilating hole to communicate in a coaxial direction with a ventilating hole provided in the rotor core and perforated in an axial direction, and a second member which is mounted on the other face of the rotor core and has a ventilating hole formed in a radiation direction from a position corresponding to the ventilating hole provided in the rotor core and perforated in the axial direction.

Description

  The present invention relates to a fully-closed electric motor for driving a vehicle.

  Generally, in a railway vehicle such as a train, a driving electric motor is loaded in a carriage disposed under the floor of a vehicle body, and the rotational force of the electric motor is transmitted to wheels via a gear device to run the vehicle.

  Conventionally, an open-type electric motor that circulates outside air in the machine and cools it has been used for this drive motor.In recent years, in order to achieve long-term non-decomposition by reducing noise and eliminating contamination by outside air inside the machine, Adoption of a fully-enclosed motor is being considered.

  The structure of this vehicle drive fully-closed electric motor will be described with reference to FIG. An annular stator core 2 is attached to the inner peripheral portion of a frame 1 having a side plate at one end, and a plurality of grooves are provided on the inner peripheral side of the stator core. The both ends of the stator coil 3 protrude from the stator core 2.

A bearing bracket 4 incorporating a bearing 6 is attached to one end side of the frame 1, and a bearing housing 5 incorporating a bearing 7 is attached to the other end side, and the rotor shaft 8 is instructed to rotate freely by the bearings 6, 7. An annular rotor core 9 is attached to the central portion of the rotor shaft 8, and a rotor bar 10 is attached in a plurality of grooves provided on the outer peripheral side of the rotor core.

  A large number of cooling fins 1 a and 1 b are provided on the outer surface of the frame 1, and a number of cooling fins 4 a are also provided on the outer surface of the bearing bracket. The frame 1 is fixedly supported by a carriage (not shown), and the protrusion 8a of the rotor shaft 8 is directly connected to the drive gear side (not shown) by a joint 11.

  In this fully-closed drive motor, the stator coil 3 and the rotor bar 10 generate heat during operation, and the temperature of the motor rises. Heat generated in the electric motor is released to the outside air through the surfaces of the frame 1 and the bearing bracket 4 to cool the electric motor. In order to promote this cooling action, heat radiation fins 1a, 1b, 4a are provided.

JP 09-46960 A

  However, in the conventional fully-closed drive motor, the outside air does not circulate inside the machine, so the inside of the machine will not be polluted with dust mixed in the outside air. However, there is the following problem, and improvement is desired for practical use. It was rare.

  The first problem is a decrease in capacity (output) due to a decrease in cooling capacity. The heat generated in the stator coil 3 and the rotor bar 10 is indirectly discharged to the outside air from the frame 1 and the bracket 4 to be cooled, and the cooling performance is significantly reduced. For this reason, the temperature rise of the motor during operation exceeds the specified value, and a predetermined output cannot be obtained.

  In order to keep the temperature rise within the specified value, it is necessary to increase the size of the stator coil 3 and the rotor bar 10 to suppress the generated heat, and the size is inevitably increased. When the motor becomes large, it cannot be loaded (stored) in the carriage.

  The second problem is that the temperature rise of the bearing 6 and the bearing 7 becomes excessive. Since the rotor inside the machine cannot be cooled by outside air, the temperature rise of the rotor is increased compared to the prior art, and this heat is transmitted to the bearing via the rotor shaft 8 to raise the temperature of the bearing. Further, since the air in the machine is also heated, this heat is transmitted to the bearing bracket 4 and the bearing bracket 5 to similarly increase the temperature of the bearing.

  The bearing 6 and the bearing 7 are lubricated with grease filled in pockets in and around the bearing. As the temperature of the grease increases, the heat deteriorates and the lubricity deteriorates, so it needs to be replaced.

  As a fully-enclosed motor, if the temperature rise of the bearing section becomes larger than specified even if it is intended to eliminate internal fouling and extend the disassembly cycle, the grease will deteriorate prematurely and the grease will be replaced by disassembling the motor. It will be necessary to extend the decomposition cycle.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle-drive fully-closed electric motor that can improve the cooling performance, reduce the size and weight, and extend the decomposition cycle without circulating outside air.

  The above-described problem is a fully-closed structure including a stator frame, a stator iron core provided on the inner peripheral surface of the stator frame, and a rotor iron core attached to the rotor shaft, and a structure that prevents outside air from flowing into the machine. In the type electric motor, the first and second brackets that are attached to both ends of the stator frame and that form a flow path of the outside air between the stator frame and the rotor iron core are attached to one surface of the rotor iron core. A first member having a vent hole that communicates in a coaxial direction with a vent hole that penetrates in the axial direction provided, and a vent that is attached to the other surface of the rotor iron core and penetrates in the axial direction provided in the rotor iron core This can be achieved by including a second member having a vent hole formed in a radial direction from a position corresponding to the hole.

  According to the present invention, it is possible to provide a fully-closed electric motor capable of improving the cooling performance, reducing the size and weight, and extending the decomposition cycle without circulating outside air.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a vehicle drive fully-closed electric motor according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the fully-closed electric motor of 2nd Embodiment based on this invention. FIG. 3 is a partial cross-sectional view of FIG. It is a longitudinal cross-sectional view of the vehicle drive fully-closed electric motor of 3rd Embodiment based on this invention. It is a block diagram of other embodiment of a heat sink. It is a block diagram of other embodiment of a heat sink. It is a block diagram of other embodiment of a heat sink. It is a longitudinal cross-sectional view of the vehicle drive fully-closed electric motor of 4th Embodiment based on this invention. It is a fragmentary sectional view of FIG. It is a longitudinal cross-sectional view of a conventional vehicle drive fully-closed electric motor.

(First embodiment)
A vehicle drive fully-closed electric motor according to a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a vehicle drive fully-closed electric motor according to a first embodiment of the present invention.

  The fully-closed motor for driving a vehicle according to the first embodiment of the present invention is provided with a heat radiating plate 19 and a heat radiating plate 20 on both ends of the rotor core 9, and the outer peripheral portion of each of the heat radiating plates 19 and 20 and a stator. A circumferential minute gap is formed between the members 13 and 14, and the bearing bracket 15 and the bearing 6 built in the bearing bracket 16 are disposed at positions outside the radiator plates 19 and 20, respectively. 7, the rotor shaft 8 is supported, and annular outside air introduction spaces 21 and 22 centering on the rotor shaft 8 are formed between the heat sinks 19 and 20 and the bearing support members 15 and 16, and the stator members 15 and 16. A plurality of communication ports 13a, 15a, 14a, and 16a provided in the communication between the outside air introduction spaces and the outside space.

  Due to the operation of the vehicle drive fully-closed electric motor of the present embodiment, the heat generated in the machine is released from the outer peripheral surface of the frame 12 and the cooling fins 12a to the outside space (outside air), and at the same time, the heat generated from the rotor. Is transmitted to the heat radiating plates 19 and 20 via the iron core holding plates 17 and 18 and then released to the outside air introduction spaces 21 and 22. Further, the heat of the heated interior space (inside air) is also released to the outside air introduction spaces 21 and 22 through the radiator plates 19 and 20.

  In the outside air introduction spaces 21 and 22, traveling wind flows when the vehicle travels, and the air in the outside air introduction space is agitated by the rotation of the heat radiating plates 19 and 20. Since it becomes the same temperature, the discharge | release function of the heat | fever in a machine from a heat sink is performed actively.

  Furthermore, since many fins 19a, 19b and 20a, 20b are provided on the inner and outer wall surfaces of the heat radiating plates 19, 20, the transfer of heat in the machine to the outside air is more effectively performed.

  As described above, the cooling of the entire motor is significantly improved as compared with the conventional fully-closed motor, so that the motor can be reduced in size and weight or output can be increased. Further, since the outside air introduction spaces 21 and 22 are provided between the bearing bracket 15 and the bearing housing 16 supporting the bearings 6 and 7 and the interior space, the bearing bracket 15 and the bearing housing 16 are heated by the heat of the inside air. In addition, the heat transmitted from the frame 12 to the bearings 6 and 7 is also cooled and suppressed by the outside air flowing through the communication ports 13a, 15a, 14a, and 16a.

  Therefore, the temperature rise in the bearings 6 and 7 and the vicinity thereof is greatly reduced as compared with the conventional fully-closed electric motor, and the deterioration of the lubricating grease can be prevented, so that the life of the grease can be extended and the electric motor can be disassembled. The period can be lengthened.

  Next, the configuration of the fully closed motor for driving a vehicle according to the first embodiment of the present invention will be described in detail with reference to FIG.

  In the vehicle drive fully-closed electric motor according to the first embodiment of the present invention, an annular stator core 2 is fixed to the inner peripheral portion of the frame 12. The stator coil 3 is housed in a plurality of grooves provided on the inner peripheral side of the stator core 2, a bracket 13 is attached to the drive side end of the frame 12, and a bearing bracket 15 incorporating the bearing 6 is attached to the bracket 13. is there. A bracket 14 is attached to the other end of the frame 12, and a bearing housing 16 having a built-in bearing 7 is attached to the bracket 14. A number of cooling fins 12 a are provided on the outer peripheral surface of the frame 12. Both ends of the rotor shaft 8 are supported by the bearings 6 and 7, the rotor iron core 9 is attached to the center of the rotor shaft 8, and the iron core holding plates 17 and 18 are attached to both ends of the rotor iron core 9. A plurality of grooves are provided on the outer peripheral side of the rotor core 8 and the rotor bar 10 is accommodated therein. Heat radiating plates 19 and 20 are attached in close contact with the outer sides of the iron core pressing plates 17 and 18 on both sides of the rotor, and a circumferential shape is formed between the outer peripheral portion of each heat radiating plate and the inner peripheral portion of the brackets 13 and 14 on the fixed side. The labyrinth that opposes is formed in the small gap of.

  An outside air introduction space 21 is formed between the heat sink 19 on the driving side, the bearing bracket 15 and the bracket 13, and this outside air introduction space communicates with the outside space through a plurality of communication ports 13a and 15a. Similarly, an outside air introduction space 22 is formed between the heat sink 20 on the counter drive side, the bearing housing 16 and the bracket 14, and this outside air introduction space communicates with the outside space through a plurality of communication ports 14a and 16a. .

  A large number of fins 19a are provided on the outer wall surface of the heat radiating plate 19, and a large number of fins 19b are provided on the inner wall surface.

  The fins 19a and 19b are formed in a shape extending continuously in the circumferential direction (rotating direction) of the heat sink. Similarly, a large number of fins 20a are provided on the machine outer wall surface of the heat sink 20, and a large number of fins 20b are provided on the machine inner wall surface. The fins 20a and 20b are formed in a shape extending continuously in the circumferential direction (rotation direction) of the heat sink.

  In the vehicle drive fully-closed electric motor according to the first embodiment based on the present invention configured as described above, heat generated in the vehicle during operation is released to the outside air from the surface of the frame 12 and the cooling fins 12a. The heat radiation plates 19 and 20 provided on both side surfaces of the rotor are discharged to the outside air introduction spaces 21 and 22.

  Running air flows through the outside air introduction spaces 21 and 22 as the vehicle travels, and the air in the outside air introduction space is agitated by the rotation of the heat radiating plate, so the outside air always circulates on the surface of the heat radiating plate. Therefore, the heat transmitted from the inside of the machine to the heat radiating plate is efficiently released to the outside air, and the cooling performance is improved.

  Further, since the fins 19a, 19b and 20a, 20b are provided on the inner and outer walls of the heat radiating plates 19, 20, the surface area is increased, heat transfer from the inside air to the outside air is more effectively performed, and the cooling performance is improved. To do. The cooling fins 19a and 20a have a shape extending in the rotation direction (circumferential direction), unlike a fan for blowing air, so that no wind noise is generated during rotation and noise generation can be prevented.

  Further, since cold outside air always flows in the outside air introduction spaces 21 and 22 on the rear side of the inside of the bearing bracket 15 and the bearing housing 16, the bearing bracket 15 and the bearing housing 16 are cooled, and a temperature rise in the vicinity of the bearing and the bearing is suppressed. The Further, since heat transmitted from the rotor shaft to the bearing is released to the outside air by the heat radiating plates 19 and 20, heat is hardly transmitted to the bearing.

  Since the fully closed electric motor according to the first embodiment of the present invention can improve the cooling performance, it can be reduced in size and weight or increased in capacity (output) as compared with a conventional fully closed electric motor. . At the same time, since the temperature rise of the bearing portion can be suppressed, deterioration of the lubricating grease can be prevented and the motor disassembly period can be extended.

(Second Embodiment)
A fully closed motor according to a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 2 is a longitudinal sectional view of a fully closed electric motor according to a second embodiment of the present invention. FIG. 3 is a partial cross-sectional view of FIG. 1 having the same structure as that shown in FIG.

  The fully-closed motor for driving a vehicle according to the second embodiment of the present invention is provided with a plurality of vent holes 9a penetrating in the axial direction in the rotor core 9, and the vent hole 24a is also provided in the iron core presser plate 24 on the non-drive side. One of the features is that a radial duct 23a is provided in the iron core presser plate 23 on the drive side.

  During operation of the fully closed electric motor according to the present embodiment, the internal air is blown up to the outer peripheral side by the fan action of the radial duct 23a due to the rotation of the iron core retainer plate 23, and the internal air in the internal space on the driving side is It circulates through the space 25 between the inner peripheries to the non-driving side machine interior space, and further circulates through the vent hole 9a of the rotor core and returns to the radial duct 23a.

  Thus, during operation, the inside air circulates and circulates in the machine through the rotor core outer peripheral space 25. Therefore, the outer periphery of the rotor core where the temperature rise is the largest in the machine is effectively cooled, and at the same time, the whole machine is cooled uniformly, so that local heating (local heat) can be prevented. The cooling performance of the is improved.

  Also in the vehicle drive fully-closed electric motor of the present embodiment, the cooling fins 19a and 20a have a shape extending in the rotation direction (circumferential direction) unlike the fan for blowing air, so that wind noise is generated during rotation. In addition, the generation of noise can be prevented.

(Third embodiment)
A vehicle drive fully-closed electric motor according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 4 is a longitudinal sectional view of a vehicle drive fully-closed electric motor according to a third embodiment of the present invention. The same structure as that described in FIGS. 1 to 3 is denoted by the same reference numeral, and description thereof is omitted.

  In the fully-closed motor for driving a vehicle according to the third embodiment of the present invention, a plurality of ventilation holes 9a are provided in the rotor iron core 9, and ventilation holes 17a and 18a are also provided in the rotor iron core. Further, vent holes 19c and 20c are provided in the heat radiating plates 19 and 20, and the drive side outside air introduction space 21 and the non-drive side outside air introduction space 22 are communicated with each other by communicating with each vent hole.

  The vehicle drive fully-closed electric motor configured in this way can cool the outside air through the plurality of ventilation holes 9a passing through the rotor iron core in the axial direction and the ventilation holes 17a and 18a of the iron core retainer plate. This is effective for improving the cooling performance of the rotor.

  Next, another embodiment of the fin provided on the heat sink will be described. FIG. 5 is a configuration diagram of another embodiment of the heat sink. FIG. 6 is a configuration diagram of another embodiment of a heat sink. FIG. 7 is a configuration diagram of another embodiment of a heat sink.

  The heat radiating plate shown in FIG. 5 is formed by arranging a plurality of fins 26a on the machine outside of the heat radiating plate 26 and fins 26b on the machine inside in the circumferential direction (rotational direction) and further intermittently arranging them.

  The heat radiating plate thus configured has a large surface area in contact with the inside air or outside air, but can reduce wind noise during rotation. Further, since the fins 26 are intermittently arranged, the stirring action of the air during rotation is slightly increased as compared with the continuous fins, and the heat dissipation effect is improved.

  Next, another embodiment of the heat sink will be described. FIG. 6 is a configuration diagram of a heat radiating plate provided in a vehicle drive fully-closed electric motor according to the present invention. FIG. 7 is a configuration diagram of a heat radiating plate provided in a vehicle drive fully-closed electric motor according to the present invention.

  The heat radiating plate 27 shown in FIG. 6 has a large number of pin-shaped protrusions 27a and 27b on the inner and outer wall surfaces. Therefore, it is possible to improve the heat dissipation performance by increasing the surface area and to prevent the generation of noise during rotation.

  The radiator plate 28 shown in FIG. 7 has a large number of ribs 28a and 28b provided radially on the wall surface. Therefore, it is possible to improve the heat dissipation performance by increasing the surface area and to prevent the generation of noise during rotation.

(Fourth embodiment)
A vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention will be described in detail with reference to the drawings. FIG. 8 is a longitudinal sectional view of a vehicle drive fully-closed electric motor according to a fourth embodiment of the present invention. FIG. 9 is a partial cross-sectional view of FIG. Note that the same structure as that described in FIGS. 1 to 7 is denoted by the same reference numeral and description thereof is omitted.

  In the vehicle drive fully-closed electric motor according to the fourth embodiment of the present invention, an outside air introduction space 22 is formed between the heat sink 20 and the bearing bracket 16. The rotor shaft 8 is supported by the bearing 7, and a collar 29 is fixed to the shaft 8 adjacent to the inner side of the bearing. The side surface and outer peripheral surface of the inner side of the collar 29 are in contact with the outside air introduction space 22, and a large number of fins 29 a are provided radially on the side surface of the collar 29.

  The heat generated in the rotor during operation of the vehicle drive fully-closed electric motor configured as described above is transmitted to the rotor shaft 8 to heat the bearing 7, but the collar 29 fixed on the inner side of the bearing is the rotor 29. Since the heat of the shaft 8 is released to the outside air introduction space and the heat transferred to the bearing side is reduced, the temperature rise of the bearing 7 is further reduced.

  The vehicle drive fully-closed electric motor configured as described above increases the surface area of the collar 29 in contact with the outside air introduction space 22 by a large number of fins 29a provided on the collar 29, and promotes air agitation by the fins 29a during rotation. And since the heat radiation effect | action of the external air introduction space is improved from the collar 29, the temperature reduction effect of a bearing improves.

  The vehicle drive fully closed electric motors of the first to fourth embodiments based on the present invention have been described as induction motors. However, the vehicle drive fully closed electric motors based on the present invention are limited to induction motors. For example, the present invention can also be applied to a synchronous motor using a permanent magnet as a rotor and other types of motors.

In addition, the vehicle drive fully-closed electric motors according to the first to fourth embodiments have been described on the assumption that the radiator plate and the outside air introduction space are configured on both the drive side and the non-drive side. Even if the plate and the outside air introduction space are configured only in one of them, the effect of the present invention can be obtained, so it is not particularly limited to providing both.
In addition to heat radiation from the surface of the stator frame, the fully-closed motor for driving the vehicle according to the present invention can actively dissipate heat to the outside air by a heat sink provided on the side of the rotor, thus improving the cooling performance. In addition, the motor can be reduced in size and weight or the capacity can be increased. In addition, an outside air introduction space can be formed inside the machine of the bearing bracket (or housing) that supports the bearing, and the outside air can be circulated in this space, so the bearing and the bearing support portion are cooled to reduce the temperature rise of the bearing portion. I can do it. Furthermore, since the heat transmitted from the rotor shaft to the bearing is released to the outside air introduction space by the heat radiating plate and the collar, the temperature rise of the bearing can be further reduced.

  By further reducing the temperature rise of the bearing, it is possible to prevent deterioration of the lubricating grease and to extend the decomposition cycle.

  In addition, a large number of fins for improving the cooling performance of the heat radiating plate are provided. Since the shape of the fins is such that the wind noise during rotation is small, the generation of noise can be prevented and the noise can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Frame, 1a ... Cooling fin, 2 ... Stator iron core,
DESCRIPTION OF SYMBOLS 3 ... Stator coil, 4 ... Bearing bracket, 4a ... Cooling fin 5 ... Bearing housing, 6 ... Bearing, 7 ... Bearing 8 ... Rotor shaft, 9 ... Rotor Iron core, 10 ... rotor bar,
11 ... Joint, 12 ... Frame, 12a ... Cooling fin,
13 ... Bracket, 13a ... Communication port, 14 ... Bracket,
14a ... Communication port, 15 ... Bearing bracket, 15a ... Communication port,
16 ... Bearing housing, 16a ... Communication port, 17 ... Iron core retainer plate,
18 ... Iron core holding plate, 19 ... Heat sink, 19a ... Fin,
19b ... fins, 20 ... heat sink, 20a ... fins, 20b ... fins,
21 ... Outside air introduction space, 22 ... Outside air introduction space, 23 ... Iron core presser plate,
23a ... Radial duct, 24 ... Iron core retainer plate, 24a ... Vent hole,
25 ... rotor core outer peripheral space, 26 ... heat sink, 26a ... fins,
26b ... fins, 27 ... heat sinks, 27a ... projections, 27b ... projections,
28 ... heat sink, 28a ... rib, 28b ... rib, 29 ... collar,
29a ... Fin

Claims (4)

In a fully-closed electric motor comprising a stator frame, a stator iron core provided on the inner peripheral surface of the stator frame, and a rotor iron core attached to the rotor shaft in the machine and having a structure that does not allow outside air to flow into the machine,
First and second brackets attached to both ends of the stator frame and forming a flow path of outside air between the inside of the machine;
A first member attached to one surface of the rotor core and having a ventilation hole communicating in an axial direction with a ventilation hole penetrating in the axial direction provided in the rotor core;
A second member having a vent hole formed in a radial direction from a position corresponding to a vent hole penetrating in the axial direction provided in the rotor core and attached to the other surface of the rotor core. A fully enclosed motor.   The fully-closed electric motor according to claim 1, wherein the first and second members are composed of an iron core holding plate and a heat radiating plate.   A vent hole formed in a radial direction from a position corresponding to a vent hole penetrating in the axial direction provided in the rotor iron core and a vent hole penetrating in the axial direction provided in the rotor iron core. The fully-closed electric motor according to claim 1, wherein each is formed on an iron core retainer plate.   The vent hole formed in the second member and formed in the radial direction from the position corresponding to the vent hole penetrating in the axial direction provided in the rotor core increases as the distance from the rotor shaft increases. The fully-closed electric motor according to claim 1, wherein a width in a rotation direction of the motor is widened.

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