JP2011166908A - Totally enclosed motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a totally enclosed motor which improves its cooling performance by eliminating clogging due to dust accumulated in a vent hole made in a rotor core. <P>SOLUTION: In a motor where rotating heat sinks 18 and 19 dish-shaped in cross section are attached to both sides of a rotor core 6, and the stator 5 and the rotor 9 of a motor are sealed with a stator frame, peripheral brackets, and rotating heat sinks in such a way that the periphery may face the peripheries of the peripheral brackets 11 and 14 via minute space and cooling air is circulated through a vent hole 24 opened in a rotor core 6, the wall faces on the sides of circular space parts 22 and 23 of each rotating heat rotating plate 18 and 19 are provided with fins 18b and 19a, respectively, which function as centrifugal fans, and airways 12b, which are roughly radial to the wall face of an inner perimetrical bracket 12, are created, and one end of each airway 12b is led to the peripheral side of the circular space part 22 by an intake 12c, and the other end of the airway 12b is led to a vent hole 24 which passes through in the axial direction of the rotor core 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric motor that drives a vehicle such as a train, and more particularly to a fully-closed electric motor that can be reduced in size and weight by improving cooling performance.

  2. Description of the Related Art Conventionally, an electric motor that drives a vehicle such as a train uses an open-type ventilation cooling system. Since this open-type electric motor is installed under the floor of a vehicle where dust, water droplets, etc. flies, the cooling part inside the machine is damaged, and it is necessary to periodically disassemble it and perform cleaning and maintenance.

  In recent years, development of fully-closed electric motors that can reduce the maintenance labor by eliminating the fouling of the cooling section in the machine has been promoted. Since this conventional fully-closed electric motor is structurally inferior in cooling performance to an open-type ventilation cooling electric motor, the output of the electric motor is reduced or the electric motor must be enlarged. However, it is necessary to avoid increasing the size of a vehicle drive motor installed under the vehicle floor, and therefore further improvement in cooling performance is necessary.

  Conventionally, in order to improve the cooling performance of a fully-driving electric motor for driving a vehicle, a plurality of vent holes penetrating in the axial direction around the axis of the rotor core are provided, and cooling outside air flows into the vent holes from outside the machine. An invention for improving the cooling of the rotor has already been disclosed (for example, see Patent Document 1).

  FIG. 8 shows an example of several embodiments described in Patent Document 1. In the fully-closed electric motor 1, a cylindrical stator core 3 is fitted on the inner peripheral side of the stator frame 2. The stator bracket 4 is wound around the stator core 3 to form a stator 5, and the bearing bracket has a structure in which the flanges provided at both ends of the stator frame 2 are divided into two in the radial direction. 10 and 13 are attached.

  The bearing brackets 10 and 13 divided into two in the radial direction are attached to annular outer peripheral brackets 11 and 14 attached to the end of the stator frame 2 and outer surfaces in the vicinity of the inner peripheral parts of the outer peripheral brackets 11 and 14. The inner peripheral brackets 12 and 15 are formed.

  The bearings 16 and 17 are held in a bearing housing formed at the center of the inner peripheral brackets 12 and 15, and the rotor 9 is rotatably supported by the bearings 16 and 17.

  The rotor 9 includes a rotor shaft 8, a cylindrical rotor core 6 fixed to the central portion of the rotor shaft 8 in the axial direction by iron core pressing plates 6 a and 6 b, and a slot of the rotor core 6. The secondary conductor 7 is inserted.

  Then, a cone-shaped (or dish-shaped) rotating heat sink 18 having a shape extending toward the shaft end is attached to the outer side surface of the core holding plate 6a on the driving side of the rotor 9, and the rotating heat sink 18 is Fins 18b are provided in the vicinity of the inner peripheral portion of the outer surface. Similarly, a cone-shaped (or dish-shaped) rotating heat radiation plate 19 having a shape extending toward the shaft end is attached to the outer surface of the counter-driving side iron core pressing plate 6b. The rotating heat sink 19 is not provided with fins on the outer surface.

  The labyrinth seals 20 and 21 are constituted by the outer peripheral edge portions 18a and 19a of the rotary heat radiating plates 18 and 19 and the inner peripheral edge portions 11a and 14a of the outer peripheral brackets 11 and 14, thereby fixing the main portion of the electric motor. The core 3, the stator coil 4, the rotor core 6 and the secondary conductor 7 are fully closed by the stator frame 2, the outer peripheral brackets 11 and 14, and the rotating heat sinks 18 and 19, and external cooling air is directly inside the motor. It is configured not to touch.

  In addition, the rotary heat sink 18 and the inner peripheral bracket 12, and the rotary heat sink 19 and the inner peripheral bracket 15 are opposed to each other with a predetermined dimension in the axial direction. Annular spaces 22 and 23 are formed between the shaft 8 and the inner peripheral bracket 12, and between the rotating heat sink 19 on the counter drive side, the rotor shaft 8 and the inner peripheral bracket 15, respectively.

  The annular spaces 22 and 23 communicate with the outside through the air inlets 12a and 15a provided through the inner peripheral brackets 12 and 15, and the gap between the outer peripheral bracket 11 and the inner peripheral bracket 12 (that is, the exhaust port). 11c), the gap between the outer peripheral bracket 14 and the inner peripheral bracket 15 (that is, the exhaust port 14c) communicates with the outside.

  A plurality of vent holes 24 penetrating in the axial direction are provided around the rotor shaft 8 on which the rotor core 6, the iron core holding plates 6 a and 6 b and the rotating heat sinks 18 and 19 are fitted. The openings on both sides of the hole 24 face the annular space 22 on the driving side and the annular space 23 on the non-driving side.

  One end 8a of the rotor shaft 8 protrudes outside the machine, and a joint (not shown) for transmitting rotational force is attached to this portion.

  In the conventional fully-closed motor configured as described above, the stator coil 4 and the secondary conductor 7 generate heat due to copper loss, and the stator core 3 and the rotor core 6 generate heat due to iron loss during motor operation. Heat generated in the stator core 3 and the coil 4 is transmitted from the stator core 3 to the stator frame 2 and is released to the outside air from the outer peripheral surface of the stator frame 2 and a large number of cooling fins.

  On the other hand, the heat generated in the rotor core 6 and the secondary conductor 7 is transferred from the rotor core 6 to the rotating heat radiating plate 18 on the driving side and the rotating heat radiating plate 19 on the non-driving side via the iron core holding plates 6a and 6b on both sides. It is transmitted. The heat of the in-machine air (inside air) is also transmitted from each inner wall surface to the drive side rotary heat sink 18 and the counter drive side rotary heat sink 19. The heat transmitted to the rotary heat radiating plates 18 and 19 is released to the outside air in the annular space portions 22 and 23 from the side surfaces on the outside of the machine.

  The traveling wind generated by the traveling of the vehicle flows into the annular spaces 22 and 23 from the air inlets 12a and 15a, and cools the side surfaces of the rotary radiator plates 18 and 19 on the outside of the machine. The outside air temperature is kept lower than the temperature inside the machine.

  Further, a part of the outside air that has flowed into the counter drive side annular space 23 from the counter drive side air inlet 15a is sucked by the centrifugal fan action of the fins 18b provided on the drive side rotary heat sink 18 to rotate. After the rotor core 6 is cooled from the inside while flowing through the ventilation holes 24 of the core 6, the rotor core 6 enters the annular space 22 on the drive side and is accelerated by the fan action of the fins 18 b and is driven from the exhaust port 11 c on the drive side. It flows out.

  As described above, in the conventional fully-closed electric motor described in Patent Document 1, heat is radiated by the rotating heat radiating plate simultaneously with heat radiated from the outer peripheral surface of the motor, and the cooling outside air is also circulated through the ventilation hole 24. Since the rotor core 6 is cooled from the inside, the cooling performance is improved as compared with the conventional fully-closed motor in which the rotor core 6 does not have the ventilation holes 24, and the size can be reduced and the output can be increased. It has characteristics.

JP 2008-029150 A

  By the way, since the drive motor 1 for a train or the like is loaded in a carriage under the vehicle body, the outside air around the motor during travel contains a lot of dust, iron powder, water droplets, etc. that are wound up by the travel wind. Yes. Dust, iron powder, water droplets, and the like mixed in the outside air flowing through the ventilation holes 24 provided in the rotor core 6 for cooling adhere to the external airflow passage in the machine, and are particularly provided in the rotor core 6. Dust mixed in the outside air flowing through the ventilation hole 24 is pressed against the inner peripheral surface of the ventilation hole 24 by the centrifugal force accompanying the rotation of the rotor core 6 and gradually accumulates, and finally the ventilation hole 24 is clogged. This contributes to a decrease in the cooling effect.

  If the amount of outside air flowing through the ventilation hole 24 of the rotor core 6 is reduced, the dust contained in the outside air is reduced and clogging is less likely to occur, but the outside air amount itself is reduced, so the cooling performance of the rotor core is reduced. I cannot deny it.

  Therefore, the present invention aims to improve cooling performance by reducing clogging due to dust as much as possible without reducing the amount of outside air flowing through the ventilation hole opened in the rotor core, and also for maintenance such as disassembly and cleaning. An object of the present invention is to provide a fully enclosed motor that can save labor.

In order to achieve the above object, the invention of a fully-closed motor according to claim 1 is a rotation comprising a rotor core, a secondary conductor and a rotor shaft on the inner periphery of an annular stator core wound with a stator coil. An annular outer peripheral bracket is fixed to the driving side end surface and the non-driving side end surface of the stator core, and an inner peripheral bracket with a built-in bearing held at the center is fixed to the inner peripheral side of the outer peripheral bracket. The rotor shaft is rotatably supported by the bearing, and a rotating heat sink is attached to each of the driving side end surface and the non-driving side end surface of the rotor core, and the outer peripheral edge of each rotating heat sink is opposed to this. A labyrinth seal is formed between the inner peripheral edge of each outer peripheral bracket, each annular heat sink, the inner peripheral bracket, and the rotor shaft form an annular space, and each annular space is used as an inner peripheral bracket. An air inlet and an exhaust port that are provided communicate with the outside of the machine, and a ventilation hole that penetrates the rotor core and the rotating radiator plate in the axial direction is provided. In the fully-closed electric motor configured to communicate the annular spaces on the side, fins are radially provided on the wall surfaces of the rotating heat sinks installed on the driving side and the non-driving side in contact with the annular spaces, A substantially radial air passage is provided for one of the inner peripheral brackets installed on the driving side and the non-driving side, and an inlet for the air passage is provided on the outer peripheral portion side of the annular space portion. Let the exit of the road face the ventilation hole provided in the rotating heat sink,
By separating the dust and the like mixed in the outside air flowing into one of the annular spaces by the centrifugal fan action of the fins, the dust is exhausted from the exhaust port, and clean outside air is introduced from the intake port into the air passage. The air is circulated from the outlet of the air passage through the ventilation hole penetrating the rotary heat sink and the rotor core, and flows into the other annular space, and is discharged outside the machine by the fins provided on the rotary heat sink. It is characterized by that.

  According to the present invention, when the rotor core is cooled by the outside air flowing in the ventilation hole opened in the rotor core, the outside air flowing through the ventilation hole of the rotor core is caused by the centrifugal fan effect of the fins provided on the rotating heat sink. Since dust, iron powder, water droplets, etc. have been removed in advance, clogging of the ventilation holes is unlikely to occur even if the motor is operated for a long period of time. For this reason, since the cooling effect of the rotor core hardly decreases from the initial operation state, the period of the disassembly / cleaning work can be lengthened, and the labor saving of maintenance can be achieved. In addition, since the ventilation hole of the rotor core is less likely to be clogged due to dust accumulation, the cooling performance can be improved by increasing the amount of cooling air passing through the ventilation hole of the rotor core. Further miniaturization or increase in output can be achieved.

Sectional drawing of Embodiment 1 of the fully-closed electric motor of this invention. The side view of Embodiment 1 of the fully-closed electric motor of this invention. 1 is a partial cross-sectional view of a first embodiment of a fully closed motor according to the present invention. Sectional drawing of Embodiment 2 of the fully-closed electric motor of this invention. The side view of Embodiment 2 of the fully-closed electric motor of this invention. The fragmentary sectional view of Embodiment 3 of the fully-closed electric motor of the present invention. The fragmentary sectional view of Embodiment 3 of the fully-closed electric motor of the present invention. Sectional drawing of the conventional fully enclosed motor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 3.

(Constitution)
Reference numeral 1 denotes a fully-closed electric motor, in which a cylindrical stator frame 2 having radiating fins on the outer peripheral surface and a magnetic steel sheet punched into an annular shape or a fan shape are fitted and fixed to the inner peripheral surface of the stator frame 2 An annular stator core 3 and a stator coil 4 wound around a slot provided in the inner peripheral portion of the stator core 3 constitute a stator 5.

  On the other hand, a rotor 9 comprising a rotor core 6, a rotor secondary conductor 7 and a rotor shaft 8 is disposed concentrically in the inner hole of the stator core 3, and is disposed at both ends of the stator frame 2. It is rotatably supported by a two-part drive-side bearing bracket 10 and a non-drive-side bearing bracket 13 that are respectively fixed by provided flanges.

  The fully-closed electric motor 1 configured as described above is fixedly supported by a bogie frame under the vehicle floor with bolts by mounting arms 25 and 26 provided on the outer peripheral portion of the stator frame 2. The drive-side end 8a of the rotor shaft 8 protrudes outside the machine, and this portion is directly connected to the drive gear device via a joint (not shown).

  By the way, the two-part bearing brackets 10 and 13 are divided into two parts in a radial direction, a part fixed to the stator frame and a part holding the bearing, and a part fixed to the stator frame. Are the outer brackets 11 and 14, and the portions holding the bearings are the inner brackets 12 and 15.

  The outer peripheral brackets 11 and 14 are formed in an annular shape, and the outer peripheral portion thereof is fixed to the end portion of the stator frame 2 by a fixing tool such as a bolt. On the other hand, the inner peripheral brackets 12 and 15 are respectively fixed to the outer surfaces of the outer peripheral brackets 11 and 14 that are slightly separated from the inner peripheral edge portions 11a and 14b in the axial direction by fixing members such as bolts. In addition, a bearing housing portion that houses and holds the bearings 16 and 17 is provided substantially at the center.

Next, the outer peripheral brackets 11 and 14 will be described in more detail.
The outer peripheral brackets 11 and 14 form inner peripheral edge portions 11a and 14a for constituting a labyrinth seal, which will be described later, respectively, and a predetermined gap is provided from the inner peripheral edge portions 11a and 14a in the rotor axial direction. The fixing seats 11b and 14b are projected from the outer end surface so as to fix the brackets 12 and 15, respectively.

  The radius of the inner peripheral edge portion 11a of the outer peripheral bracket 11 on the driving side and the distance from the rotor shaft center line of the fixed seat 11b are determined in consideration of the work of pulling out the rotor 9 from the driving side during maintenance and inspection. Is selected to be larger than the outer peripheral diameter of the outer peripheral edge portion 19a of the rotating heat radiating plate 19.

  The inner peripheral bracket 12 on the driving side is fixed to the fixed seat 11b with a fixing tool such as a bolt, thereby providing a predetermined gap between the outer wall surface of the outer peripheral bracket 11 and the inner wall surface of the inner peripheral bracket 12 itself. Yes.

  Moreover, the drive-side inner peripheral bracket 12 has four radial air passages 12b formed at equal intervals so as to surround the bearing housing portion, and the air inlet 12c of the air passage 12b is formed in the annular space. It is provided in the vicinity of the outer peripheral edge of the inner wall surface in contact with the portion 22, and the communication port 12 d of the air passage 12 b is provided so as to face the ventilation hole 24 provided in the rotary heat radiating plate 18 described later. Furthermore, the inner peripheral bracket 12 on the driving side is provided with two air inlets 12a penetrating through the wall surfaces between the radial air passages 12b.

  On the other hand, the outer peripheral bracket 14 attached to the non-driving side has a diameter of an inner peripheral edge portion 14a facing an outer peripheral edge portion 19a of a rotating heat radiating plate 19 which will be described later, smaller than the outer peripheral diameter of the rotor core 6. The fixing seat 14b for fixing the inner peripheral bracket 15 is provided closer to the rotor shaft 11 than the inner peripheral edge portion 14a.

  The inner peripheral bracket 15 on the counter driving side is fixed to the fixed seat 14b, thereby providing a predetermined gap between the outer wall surface of the outer peripheral bracket 14 and the inner wall surface of the inner peripheral bracket 15 itself. Further, the inner peripheral bracket 15 on the counter driving side is provided through the plurality of air inlets 15a so as to surround the bearing housing portion in the circumferential direction.

  By the way, cone-type rotary heat sinks 18 and 19 are attached to both side surfaces of the core holding plates 6a and 6b of the rotor core 6 so as to expand toward the shaft ends on the driving side and the non-driving side, respectively. The diameter of the outer peripheral edge portion 18a of the drive side rotary heat sink 18 is larger than the diameter of the outer peripheral edge portion 19a of the counter drive side rotary heat sink plate 19, and the outer peripheral edge portion 18a of the rotary heat sink plates 18 and 19 is the same. 19a and the inner peripheral edge portions 11a and 14a of the outer peripheral brackets 11 and 13 are opposed to each other by a minute gap to constitute labyrinth seals 20 and 21.

  Further, a plurality of radially formed fins 18b and 19b are projected in the vicinity of the outer peripheral edge portions 18a and 19a of the outer wall surfaces of the rotary heat sinks 18 and 19, respectively. The fins 18b and 19b act as a centrifugal fan by the rotation of the rotating heat sinks 18 and 19.

  A plurality of ventilation holes 24 are provided so as to penetrate the rotor iron core 6, the iron core holding plates 6 a and 6 b, and the rotating heat radiation plates 18 and 19 in the axial direction.

  As described above, the main parts of the motor such as the stator core 3, the stator coil 4, the rotor core 6 and the rotor secondary conductor 7 are connected to the stator frame 2, the outer peripheral brackets 11 and 14, the rotating heat sink 18 and Since the structure is fully closed by 19, external cold air does not directly touch the inside of the motor.

  In addition, in the bearing bracket 10 on the drive side, an annular space portion 22 is formed by the rotor shaft 8, the inner peripheral bracket 12 and the rotating heat radiating plate 18, and the annular space portion 22 is formed with the inlet port 12a and the exhaust port 11c. Communicates with the outside through the air passage 12b and further communicates with the ventilation hole 24 of the rotor core 6 through the air passage 12b.

  On the other hand, in the bearing bracket 13 on the non-driving side, an annular space portion 23 is formed by the rotor shaft 8, the inner peripheral bracket 15 and the rotating heat radiating plate 19, and this annular space portion 23 has an inlet port 15a, an exhaust port. 14 c communicates with the outside, and further communicates with the plurality of ventilation holes 24.

(Function)
The fully-closed electric motor according to the first embodiment configured as described above has a centrifugal fan action on the fin 18b provided on the rotating heat radiating plate 18 that rotates together with the rotor 11 when the vehicle is running on the bearing bracket 10 side on the driving side. As a result of this centrifugal fan action, outside air enters the annular space 22 through the inlet 12a, cools the outer surface of the cone-type rotary heat sink 18, and then a part is discharged from the outlet 11c to the outside of the machine.

  The remaining outside air enters the air passage hole 12b drilled in the drive side inner peripheral bracket 12 from the air inlet 12c, and from the communication port 12d to the rotating heat radiation plates 18 and 19, and the core holding plates 6a and 6b. It enters the ventilation hole 24 opened in the iron core 6. Then, after the rotary heat sink 18 and the rotor core 6 are cooled from the inside in the process of passing through the ventilation hole 24, the rotary space enters the counter drive side annular space 23.

  On the other hand, the outside air that has entered the annular space 23 through the air inlet 15a by the centrifugal fan action of the fins 19b that rotate with the rotating heat sink 19 cools the outer surface of the rotating heat sink 19 together with the cooling outside air that has circulated through the ventilation holes 24. After that, the air is discharged from the exhaust port 14c by the centrifugal fan action of the fin 19b.

  By the way, the outside air that has flowed into the annular space 22 from the air inlet 12a of the inner peripheral bracket 12 on the driving side is blown from the inner peripheral side to the outer peripheral side by the centrifugal fan action of the fins 18b provided on the rotating heat radiating plate 18, and the flow velocity. Therefore, a large centrifugal force acts on dust, iron powder, water droplets and the like mixed in the outside air, and is exhausted from the exhaust port 11c to the outside of the machine. The air inlet 12c does not enter the air passage 12b.

  Therefore, the outside air flowing into the air passage 12b from the air inlet 12c becomes clean cooled outside air from which dust, iron powder, water droplets, and the like are removed, and flows through the ventilation holes 24 of the rotor core 6 while rotating the rotor core 6. After cooling, the air is exhausted out of the machine from the non-driving side exhaust port 5a by the centrifugal fan action of the fins 19b of the rotating heat radiating plate 19.

(effect)
As described above, according to the first embodiment, in addition to the cooling from the outer peripheral surface of the motor and the cooling from the rotating heat sinks 18 and 19, the cooling outside air flowing through the ventilation hole 24 of the rotor core 6 has a fin 18b. Because the centrifugal fan effect removes dust, iron powder, water droplets and the like in advance, the vent hole 24 is not easily clogged even if the motor is operated for a long period of time. For this reason, since the cooling effect of the rotor core 6 does not decrease so much from the initial state of operation, the interval of disassembly / cleaning work or the like can be increased, and maintenance can be saved accordingly.

  In addition, since the ventilation hole of the rotor core is not easily clogged, the amount of cooling air passing through the ventilation hole of the rotor core is increased accordingly, and the cooling performance is improved, thereby further reducing the size or output of the motor. Increase can be achieved.

[Embodiment 2]
Next, Embodiment 2 of the present invention will be described with reference to FIG. 4 and FIG.
(Constitution)
The second embodiment is obtained by partially changing the configuration of the drive-side bearing bracket of the first embodiment described above, and is greatly different from the first embodiment in that it protrudes from the side surface of the drive-side outer peripheral bracket 11. Instead of the fixed seat 11b, a circular air passage 11e having a U-shaped cross section is formed by integrally covering the outer periphery of the exhaust port 11c with an annular edge portion 11d provided extending in the axial direction on the outer peripheral bracket 11 itself, And it is the point which fixed the said inner periphery bracket 12 with the volt | bolt etc. to several places of the outer side surface of this cyclic | annular edge part 11d. The other difference is that the number of the radial air passages 12b drilled in the inner peripheral bracket 12 is increased from 4 to 6, and the two circular air inlets 12a opened between the air passages 12b are used. Six exhaust ports 12g communicating with the swirling air passage 11e are provided on the wall surface of the inner peripheral bracket 12 attached to the annular edge portion 11d of the outer peripheral bracket 11 in that one oval air inlet 12f is provided. The point is that a dust discharge hole 11f is provided at a lower position of the swirling air passage 11e in a state where the fully closed electric motor 1 is mounted under the floor. In FIGS. 4 and 5, the electric motor is upside down.

Others are the same as those in the first embodiment, and thus the same reference numerals are used and repeated descriptions are omitted as appropriate.
The six air passages 12b drilled in the inner peripheral bracket 12 communicate with the exhaust port 12g at the inlet 112h opened at the outer peripheral side end, and the communication ports 12d provided around the bearing housing Similar to the first embodiment, it is configured so as to communicate with the ventilation hole 24 opened in the cone-type rotating heat sink 18.

(Function)
Also in the case of the second embodiment, the cooled outside air that has flowed into the annular space 22 from the air inlet 12a due to the centrifugal fan action of the fins 18b that rotate together with the rotating heat radiating plate 18 is blown up to the outer peripheral side in the annular space 22. Then, the air reaches the swirling air passage 11e, and is then discharged from the exhaust port 12g opened on the side surface to the outside space after turning the swirling air passage 11e.

  At this time, dust or the like mixed in the cooling outside air gathers and turns on the outer peripheral side inner wall of the turning air passage 11e and is discharged out of the machine from the dust discharge hole 11f.

  Since dust and the like are removed from the cooled outside air discharged from the exhaust port 12g, the outside air flowing into the air passage 12b from the inlet port 12h is purified, and this cleaned outside air passes through the rotor core 6. The rotor core 6 and the rotating heat sinks 18 and 19 are cooled from the inside through the air holes 24, flow into the annular space 23 on the non-driving side, and are exhausted to the outside by the fins 19b.

(effect)
As described above, this second embodiment also has a structure because clean outside air from which dust and the like are removed flows through the ventilation holes 24 of the rotor core 6 as in the first embodiment. For this reason, there can exist an effect similar to 1st Embodiment.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described with reference to FIG. 6 and FIG.
(Constitution)
The third embodiment is a partial modification of the configuration around the counter driving side rotating heat sink 19 of the first embodiment described above, and the main difference from the first embodiment is that the counter driving side iron core retainer plate. 6b and the number of ventilation holes opened in the fixed part of the rotating heat sink 19 are larger than the number of ventilation holes 24 provided in the rotor core 6 and the outer peripheral surface of the rotating heat sink 19 in the circumferential direction. The disc-shaped heat absorption fins 27 are provided in parallel.

  Others are the same as those in the first embodiment, and thus the same reference numerals are used and repeated descriptions are omitted as appropriate.

  Ventilation holes 28 are formed in the iron core retainer plate 6b of the third embodiment so as to increase the number of ventilation holes 24 provided in the rotor iron core 6 to two or more. A ventilation hole 29 is formed in the fixed portion of the rotary heat radiating plate 19 installed outside the iron core holding plate 6 b so as to match the ventilation hole 28.

(Function)
Cooling outside air that flows in from the inlet 15a of the inner peripheral bracket 15 by the centrifugal fan action of the fin 19b by rotation together with the rotating heat sink 19 circulates through the ventilation hole 24 of the rotor core 6 from the bearing bracket 10 on the driving side and is annular. After cooling the outer surface of the rotating heat radiating plate 19 together with the cooled outside air flowing into the space 23, it flows out of the machine from the exhaust port 14 c of the outer peripheral bracket 14.

  At this time, the outside air that has passed through the ventilation hole 24 of the rotor core 6 from the annular space 22 on the drive side is increased to two or more by the ventilation holes 28 of the iron core retainer plate 6 b, and the ventilation holes 29 of the rotating heat radiating plate 19 are increased. Then, the air is exhausted to the annular space 23 on the counter drive side.

  As described above, since the rotation heat dissipating plate 19 is provided with more ventilation holes 29 than in the case of the first embodiment, the cooling area of the rotation heat dissipating plate 19 is increased. Since the cooling outside air circulates through the ventilation hole 29 having an increased cooling area, the cooling performance of the rotating heat radiating plate 19 can be improved as compared with the case of the first embodiment.

  Further, by providing heat-absorbing fins 27 on the inner peripheral surface of the rotary radiator plate 19, the heat of the air in the machine is efficiently taken away by the rotary radiator plate 19, and the cooling performance of the motor is combined with the improvement of the heat radiation capability of the ventilation holes 29. Is further improved.

  Since the cooling outside air flowing from the ventilation hole 24 of the rotor core 6 is cleaned by removing dust and the like as described above, it is difficult for dust to accumulate in the ventilation hole 29 of the rotating heat radiating plate 22, and the cooling effect Is maintained even for long-term use.

(effect)
As described above, in the third embodiment, the cooling performance of the rotating heat radiating plate 19 on the non-drive side can be improved, so that the motor can be further miniaturized and the output can be increased.

[Modification]
In Embodiment 1 thru | or 3 demonstrated above, although the outer periphery brackets 11 and 14 which comprise the bearing brackets 10 and 13 were fixed to the flange of the both ends of the stator frame 2, the stator frame 2 is provided. Instead, the outer peripheral portion of the stator core 3 may be covered airtight with a thin iron plate or film, and the outer peripheral brackets 11 and 14 may be fixed to the holding plates on both sides of the stator core 3.

  In Embodiments 1 to 3 described above, the drive-side bearing bracket 10 separates and removes dust and water droplets contained in the outside air by the action of the centrifugal fan. It is not necessary to limit to 10 and may be provided on the bearing bracket 13 on the non-driving side.

  DESCRIPTION OF SYMBOLS 1 ... Fully enclosed motor, 2 ... Stator frame, 3 ... Stator core, 4 ... Stator coil, 5 ... Stator, 6 ... Rotor core, 7 ... Rotor secondary conductor, 8 ... Rotor shaft, 9 DESCRIPTION OF SYMBOLS ... Rotor, 10 ... Drive side bearing bracket, 11 ... Outer peripheral bracket, 11a ... Inner peripheral edge, 11b ... Fixed seat, 11c ... Exhaust port, 11f ... Dust discharge hole, 12 ... Inner peripheral bracket, 12a ... Inlet port, 12b ... Airway, 12c ... Inlet, 12d ... Outlet, 12f ... Inlet, 12g ... Exhaust, 13 ... Non-driving bearing bracket, 14 ... Outer bracket, 14c ... Exhaust, 15 ... Inner bracket, DESCRIPTION OF SYMBOLS 15a ... Air inlet, 16, 17 ... Bearing, 18 ... Rotating heat sink on the drive side, 18b ... Fin, 19 ... Rotating heat sink on the non-drive side, 19b ... Fin, 20, 21 ... Labyrinth seal, 22 ... Drive side Annular space part, 23 ... annular space part on the non-driving side 24 ... Tsufuana, 27 ... heat absorbing fin, 28 ... Tsufuana, 29 ... Tsufuana.

Claims (4)

A rotor composed of a rotor core, a secondary conductor, and a rotor shaft is arranged on the inner periphery of an annular stator core around which a stator coil is wound, and is annularly formed on the drive side end face and the counter drive side end face of the stator core The outer peripheral bracket is fixed to the inner peripheral side of the outer peripheral bracket, and the inner peripheral bracket with a built-in bearing held in the center is fixed. The rotor shaft is rotatably supported by the bearing, and the rotor core A rotating heat sink is attached to each of the driving side end face and the non-driving side end face, and a labyrinth seal is formed between the outer peripheral edge of each rotating heat sink and the inner peripheral edge of each outer peripheral bracket facing it. An annular space is formed by the rotating heat sink, the inner peripheral bracket and the rotor shaft, and each annular space is communicated with the outside through an air inlet and an exhaust port provided in the inner peripheral bracket. Ventilation holes provided through the rolling heat radiating plate in the axial direction, the entire closed form electric motor that is configured to communicate the annular space mutual annular space portion and the non-driven side of the drive side by the ventilation holes,
Fins are provided radially on the wall surfaces in contact with the annular space of each rotating heat sink installed on the driving side and the non-driving side,
A substantially radial air passage is provided for one of the inner peripheral brackets installed on the driving side and the non-driving side, and an inlet for the air passage is provided on the outer peripheral portion side of the annular space portion. Let the exit of the road face the ventilation hole provided in the rotating heat sink,
By separating the dust and the like mixed in the outside air flowing into one of the annular spaces by the centrifugal fan action of the fins, the dust is exhausted from the exhaust port, and clean outside air is introduced from the intake port into the air passage. The air is circulated from the outlet of the air passage through the ventilation hole penetrating the rotary heat sink and the rotor core, and flows into the other annular space, and is discharged outside the machine by the fins provided on the rotary heat sink. A fully-closed electric motor characterized by that.   A circumferential swirling air passage portion is formed by covering the outer peripheral portion of the one annular space portion, a dust discharge hole is provided at an appropriate portion of the swirling air passage portion, and the outer periphery of the side surface of the swirling air passage portion is further provided. 2. The fully-closed electric motor according to claim 1, wherein the exhaust port is provided in a wall.   The whole number of the communication holes of the said rotation heat sink opened so that it may communicate with the ventilation hole opened in the said rotor core was made larger than the number of the ventilation holes of a rotor core. Closed motor.   4. The fully-closed electric motor according to claim 3, wherein heat sink fins are provided on the outer peripheral surface of the rotary heat sink on the inner side of the machine.

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