JP4895118B2 - motor - Google Patents

Description

  The present invention relates to a motor used for an industrial machine, a railway vehicle, or the like.

  High-power motors are used in railway vehicles and industrial machines. By the way, if a large current is supplied to the motor in order to increase the output of the motor, excessive heat is generated due to eddy current loss generated in the rotor, copper loss generated in the stator, iron loss generated in each of the above, and the like. As a result, the temperature of the motor increases.

On the other hand, Patent Document 1 below discloses a technique for improving the cooling effect of the motor by forming a cooling water passage in the frame and shaft of the motor to circulate the cooling water.
Japanese Patent No. 2738814

  However, in the technique of Patent Document 1, the motor frame and the shaft in which the cooling water passage is formed can be effectively cooled. There is a problem that the amount of heat conducted to is relatively low. Therefore, a high-temperature part (for example, a stator) and a low-temperature part (for example, a frame and a shaft) are generated in the motor, resulting in variations in temperature distribution. From the viewpoint of efficiently cooling the motor. There is room for improvement.

  The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a motor that can suppress the variation in internal temperature distribution and perform cooling more effectively.

The motor of the present invention
A sealed frame having a cooling structure;
A stator attached to the frame;
A shaft rotatably supported with respect to the frame;
A rotor attached to the shaft and facing the stator;
A fluid cooling medium stored in the frame ;
Separately from the rotor, it is provided with a plurality of claw members that are attached to the outer periphery of the shaft and project in the radial direction, and rotates together with the shaft, so that the stored cooling medium is bounced up by the claw member. characterized in that it has and.

According to the motor of the present invention, since the fluid cooling medium is stored in the frame, the cooling medium jumped up by the claw member of the flip-up means adheres to the stator or the rotor. On the other hand, it is cooled by adhering to the inner wall of the frame. That is, by conducting heat from the stator or the rotor, which becomes relatively high temperature, to the frame through the cooling medium, the temperature distribution in the motor is made uniform, and the cooling of the motor is efficiently performed. I can do it. The “fluid cooling medium” may be, for example, insulating oil, but is not limited thereto.

  If the shaft has a cooling structure, cooling can be performed more effectively.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the motor according to the first embodiment. In FIG. 1, both ends of a hollow case 1 are closed via packing (not shown) by disks 2 and 2 having openings 2a and 2a, respectively. A water jacket 1 a as a cooling structure is formed in the peripheral wall of the case 1, and communicates with a cooling water supply hole 1 b and a discharge hole 1 c formed on the outer wall of the case 1. The case 1 having such a shape can be formed by welding ends of circular pipes having different diameters. Here, the case 1 and the disks 2 and 2 form a frame.

  The shaft 3 is inserted into the openings 2 a and 2 a of the disks 2 and 2 and is rotatably supported by the bearings 4 and 4. An inner seal 5 is disposed inside each bearing 4, and an outer seal 6 is disposed outside the bearing 4, and these are fixed to the disk 2 by bolts B. The inner seal 5 and outer seal 6 may be labyrinth seals, but contact seals with lips are preferred.

  A stator 7 is fixedly disposed on the inner periphery of the case 1, and a rotor 8 is fixedly disposed on the outer periphery of the shaft 3. Further, in the case 1, insulating oil OL as a cooling medium is stored up to a position indicated by a one-dot chain line in FIG. In such a state, a part of the rotor 8 is immersed in the stored insulating oil OL.

  FIG. 2 is a view of the configuration of FIG. 1 taken along the line II-II and viewed in the direction of the arrow. In FIG. 2, the stator 7 is fixedly arranged on the inner periphery of the case 1 at equal intervals in the circumferential direction, and is wound around the I-shaped silicon steel plate 7a and the silicon steel plates 7a as viewed in the direction of FIG. Coil 7b. On the other hand, the rotor 8 includes a silicon steel plate 8a fixed to the outer periphery of the shaft 3 and magnets 8b held at equal intervals in the circumferential direction so as to correspond to the coil 7b. In the present embodiment, in the outer periphery of the silicon steel plate 8a, a portion 8c between which the magnet 8b is held is a recess 8d, and the air gap volume between the stator 7 and the rotor 8 is increased. In other words, the portion 8c holding the magnet 8b protrudes radially outward as a convex portion.

  The operation of the present embodiment will be described with reference to FIGS. A pipe (not shown) is connected to the supply hole 1b and the discharge hole 1c of the case 1, and cooling water is introduced into the water jacket 1a from the outside via the supply hole 1b, and then externally again via the discharge hole 1c. The cooling water is discharged to the front.

  Here, when the motor is operated, a magnetic force is generated between the stator 7 and the rotor 8, thereby rotating the shaft 3. It is assumed that the stator 7 and the rotor 8 generate heat with the operation of the motor and become high temperature. According to the present embodiment, the rotor 8 as the spring-up means rotates together with the shaft 3, and the stored insulating oil OL is jumped up by the portion 8c holding the magnet 8b. Part of the splashed insulation oil OL adheres to the outside of the stator 7 as oil droplets, and is taken out or transferred after taking heat from the stator 7. On the other hand, another part of the splashed insulating oil OL becomes oil droplets and adheres to the inner wall of the case 1, and after being heated, the case 1 is picked or transferred. Note that the stored insulating oil OL takes heat away from the rotor 8 when it is splashed up by the rotor 8. By repeating these steps, the temperature of the stator 7 and the rotor 8 is decreased, while the temperature of the case 1 is increased, but the case 1 performs heat exchange with the cooling water passing through the water jacket 1a. Therefore, it is suppressed that it becomes high temperature. As described above, the temperature distribution inside the motor can be made uniform, and cooling can be performed efficiently.

  FIG. 3 is a cross-sectional view of a motor according to the second embodiment. The embodiment shown in FIG. 3 differs from the above-described embodiment in that a shaft cooling structure and a claw member as a flip-up means are provided.

  FIG. 4 is an enlarged sectional view showing a cooling structure of the shaft. The shaft 3 ′ of the present embodiment has a bag hole 3 a that opens to the left in the drawing, and a hollow extending member 11 is coaxially fixed to the left end of the shaft 3 ′. A holder 13 that holds the rotating ring 12 is attached to an end of the extending member 11 by a nut 14 that is screwed into the extending member 11.

  On the other hand, a cylindrical housing 15 is attached to the outside of the left disk 2 so as to cover the periphery of the extending member 11. The housing 15 has a flange-like seal portion 15 a that exerts a sealing effect on the extending member 11, and a cover member 17 that covers an end portion of the extending member 11 via an annular intermediate member 16. It is attached. A discharge hole 17 a communicating with the inside is formed on the outer periphery of the cover member 17. A sliding member 18 surrounding the extending member 11 is attached to the inner periphery of the intermediate member 16, and the sliding ring 19 held at the end of the sliding member 18 contacts the rotating ring 12 over the entire periphery. It touches. The intermediate member 16 is sealed with an O-ring with respect to the housing 15, the cover member 17, and the sliding member 18.

  The pipe 20 passing through the center of the cover member 17 extends from the end of the extending member 11 into the bag hole 3a of the shaft 3 '. The outer end of the pipe 20 is connected to a pipe (not shown).

  FIG. 5 is a view of a part of the claw member as viewed in the axial direction. The claw member 30 includes a base portion 30a fitted to the outer periphery of the shaft 3 'and a plurality of claw portions 30b protruding from the base portion 30a at an equal angle in the radial direction.

  The operation of the present embodiment will be described. When cooling water is supplied to the pipe 20 via a pipe (not shown), the supplied cooling water passes through the pipe 20 and passes through the pipe hole 3a of the shaft 3 ′. When folded around the bottom and passing between the bag hole 3a and the pipe 20, heat is taken away from the shaft 3 'and enters the inside of the cover member 17 from the end of the extending member 11, via the discharge hole 17a. It is designed to be discharged outside. Thereby, the rotor 8 can be cooled via the shaft 3 '. While the stretching member 11 is rotating, the intermediate member 16 is stationary. However, the rotating ring 12 attached to the stretching member 11 is completely out of the sliding ring 19 attached to the intermediate member 16. Since it rotates while coming into contact with the circumference, the leakage of cooling water is negligible. The cooling water leaking through here is discharged through a drain hole 15 b formed on the outer periphery of the housing 15.

  4 and 5, the claw member 30 as the flip-up means rotates with the shaft 3, and the insulating oil OL stored in the case 1 can be jumped up by the claw portion 30 b, which is the same as described above. Due to the effect, the cooling efficiency can be further increased.

  As described above, the present invention has been described in detail with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be appropriately changed and improved without departing from the spirit thereof. Of course there is.

It is sectional drawing of the motor concerning 1st Embodiment. It is the figure which cut | disconnected the structure of FIG. 1 by the II-II line | wire, and looked at the arrow direction. It is sectional drawing of the motor concerning 2nd Embodiment. It is an expanded sectional view which shows the cooling structure of a shaft. It is the figure which looked at a part of nail | claw member in the axial direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 1a Water jacket 1b Supply hole 1c Discharge hole 2 Disc 2a Opening 3, 3 'shaft 3a Bag hole 4 Bearing 5 Inner seal 6 Outer seal 7 Stator 7a Silicon steel plate 7b Coil 8 Rotor 8a Silicon steel plate 8b Magnet 8c Part 8d Concave part 11 Stretching member 12 Rotating ring 13 Holder 14 Nut 15 Housing 15a Seal part 15b Drain hole 16 Intermediate member 17 Cover member 17a Discharge hole 18 Slide member 19 Slide ring 20 Pipe 30 Claw member 30a Base 30b Claw part OL Insulation oil

Claims (2)

A sealed frame having a cooling structure;
A stator attached to the frame;
A shaft rotatably supported with respect to the frame;
A rotor attached to the shaft and facing the stator;
A fluid cooling medium stored in the frame ;
Separately from the rotor, it is provided with a plurality of claw members that are attached to the outer periphery of the shaft and project in the radial direction, and rotates together with the shaft, so that the stored cooling medium is bounced up by the claw member. The motor characterized by having. The motor according to claim 1 , wherein the shaft has a cooling structure.

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