JPS63213464A - Linear induction motor - Google Patents

Abstract

PURPOSE:To prevent dielectric breakdown from being generated, by forming a cover for covering coil end sections, as a mold, to inject resin into the internal section of the cover, and by impregnating the coil end sections with the resin. CONSTITUTION:A linear induction motor 20 is fitted on the lower side of the truck of a car body, by a bearing member, and is set to be confronted with a reaction plate set on a track. So far as the motor 20 is concerned, coils 10 are contained in a plurality of slots arranged on a central core 9, and the respective coil end sections 11 project from both the left and right sides of the core 9. The coil end sections 11 are covered over all the full length in the longitudinal direction, with a cover 22 via a space 21, and on the external surface of the cover, a plurality of cooling fins 23 are formed, and a resin injecting slot 24 communicating with the space 21 is set. Through the slot 24, the resin 25 of high thermal conductivity with insulating property is injected, and is sealed and hardened. Then, the coil end sections 11 and the cover 22 are integrally composed, and dielectric breakdown is prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention is a device that is attached to the underside of a vehicle so as to face a reaction plate installed on a track, and that applies driving force to the vehicle. Regarding the linear inductor Tanabata provided.

(Conventional technology) Conventionally, this type of linear induction motor
The ones shown in FIGS. 7 and 8 are known. That is, an axle 3 is provided on a bogie 2 placed under the floor of a vehicle body 1, wheels 4 are attached to both ends of the axle 3, and a conventional single-sided linear induction motor 5 is mounted on a support member 6 at the center of the axle 3. The structure is supported by A reaction plate 8 is installed on the track 7 so as to face the linear induction motor 5.

The linear induction motor 5 has a large number of slots in its iron core 9, a coil 10 is housed in the slot, and the slot is impregnated with resin.

Coil end portions 11 protrude from both sides of the iron core 9 of the linear induction motor 5, and a cover 12 is attached to cover the entire length of the linear induction motor 5 in the longitudinal direction so as to cover the coil end portions 11.

An outside air inlet 13 and an outside air outlet 14 are opened at both front and rear ends of the cover 12 .

Therefore, as the vehicle advances, outside air flows into the air passage 15 formed by the cover 12 through the outside air inlet 13, flows backward while cooling the coil end portion 11, and is discharged outside the machine through the outside air outlet 14. released.

In this way, the heat generated by the linear in-dungeon motor 5 is cooled down by the natural ventilation caused by the vehicle running, and heating of the coil 10 is prevented.

(Problems to be Solved by the Invention) However, the conventional linear induction motor having such a structure has the following problems. In other words, the coil 10 of the linear induction motor 5 has an iron core 9
After inserting it into the slot, it is soaked in resin, impregnated, and dried, so the resin tends to drip during drying and uneven insulation is likely to occur.This is because the impregnated resin It is easy to crack and cause dielectric breakdown.

Further, since the coil end portion 11 of the linear inductor motor 5 is cooled by the wind while the vehicle is running, the coil end portion 11 receives dust from the outside, becomes dirty, and is susceptible to dielectric breakdown.

Furthermore, since the cover 12 that covers the coil end portion 11 of the linear induction motor 5 is formed to be long along the traveling direction, the cooling air that enters the coil end portion 11 from the outside air intake port 13 when the vehicle is running is transferred to the cover 12.
The temperature gradually rises due to the heat of the coil 10 as it moves backward, and the cooling effect of the coil 10 gradually decreases as it moves backward. This means that, as shown in FIG. 9, the temperature rise of the coil located closer to the outside air outlet 14 is greater than that of the coil located at position A on the outside air intake 13 side, and the temperature on this high temperature side increases. Due to the limitations, even though there is some margin on the low temperature side, it is not possible to increase the overall output.

This invention was made in order to solve these conventional problems, and aims to provide a linear in-dungeon motor with high insulation reliability at the coil end (and high output). do.

[Structure J of the Invention (Means for Solving Problems) The linear induction motor of the present invention is provided with cooling fins having an appropriate heat dissipation area on the cover that covers the coil end portion, and in which the cover is molded. The cover and coil end are made into an integral structure by casting a resin with good thermal conductivity.

(Function) In the linear induction motor of the present invention, the cooling fins provided on the cover covering the coil end portion effectively dissipate heat from the coil portion, suppressing the rise in temperature of the coil,
Enables high output. In addition, since this cover is molded and the internal coil ends are injected and impregnated with resin, many coil ends can be effectively impregnated with resin, improving insulation properties. . Furthermore, the cooling fins on the coil cover provide effective cooling, which suppresses the temperature rise at the coil end, prevents cracks caused by the temperature rise of the impregnated resin, and effectively prevents dielectric breakdown. You can also.

(Example) Hereinafter, an example of the present invention will be explained in detail based on the drawings. 1st
The head and FIG. 2 show one embodiment of the present invention, and the linear induction motor 20 of this embodiment is similar to the conventional example and is installed on the underside of the bogie 2 of the car body 1 shown in FIG. 7 explained in the conventional example. The reaction plate 8 is installed on the track 7 by a support member 6, and is set to face a reaction plate 8 installed on the track 7. Therefore, parts having the same configuration as each part shown in FIGS. 7 and 8 are designated by the same reference numerals, and a description thereof will be omitted.

1 and 2, in the linear induction motor 20, the coils 10 are housed in a number of slots provided in the iron core 9 at the center. The coil end portions 11 of each coil 10 protrude from both left and right sides of the iron core 9.

A cover 22 covers the entire length of the coil end portion 11 in the longitudinal direction with a slight gap 21 interposed therebetween. This cover 22 has a large number of cooling fins 23 formed on its outer surface. In addition, the cover 22
A gap 21 between the coil end portion 11 and the coil end portion 11 is formed in a part of the
A resin injection hole 24 communicating with is provided.

In order to insulate the coil end portion 11, a resin 25 having high thermal conductivity and insulating properties is injected from the resin injection hole 24 into the gap 21 formed between the coil end portion 11 and the cover 22. After that, the resin injection hole 24 is sealed and the resin 25 is hardened inside the cover 22, thereby impregnating the resin 25 between the coil end portion 11 and the cover 22, thereby forming an integral structure. When injecting the resin 25, the cover 22 serves as a mold and helps the injected resin 25 spread to every corner of each coil end portion 11, thereby realizing reliable resin impregnation. .

In the linear induction motor 20 configured as described above, by flowing an alternating current to the coil 10, a moving magnetic field is generated in the reaction blade 8, which is pulled together with the moving magnetic field on the coil side, and the linear induction motor 20
The entirety of the train is run along the track 7.

When the linear induction motor 20 runs, a large amount of heat is generated in the coil 10, but the heat is transmitted to the cooling fins 23 through the cover 22, where it is released into the atmosphere by contact with the outside air, and the coil 10 is heated. The end portion 11 can be cooled.

Furthermore, while the linear induction motor 20 is running,
Dust and the like tend to adhere to the cover 22, but since the cover 22 covers the entire coil end section 11,
There is no intrusion into the coil end portion 11, making it possible to prevent dielectric breakdown.

Furthermore, since the cover 22 is molded and the coil end portion 11 is impregnated with resin, the cover 22 and the coil end portion 11 are strongly integrated, and have high strength against vibrations and vibrations during driving. Become something.

FIG. 3 shows the results of investigating the relationship between vehicle speed and coil temperature rise in the linear induction motor 20 of the above embodiment. As is clear from the graph shown in FIG. 3, in the case of the example of the present invention, the temperature distribution curve P1 is much lower than the temperature distribution curve P2 of the conventional example, and it can be seen that the cooling effect on the coil is large. .

Furthermore, as shown in FIG. 4, the temperature distribution curve Q1 of the embodiment of the present invention is different from the temperature distribution of the conventional example even in the results of measuring the temperature distribution of the coil on the front side and the return side with respect to the traveling direction of the vehicle. It can be seen that the rate of temperature rise at the rear of the vehicle is smaller than that of curve Q2.

Therefore, the linear induction motor 20 of this embodiment
In this case, the temperature rise in the coil end portion 11 at each point flA-D is low, and accordingly, compared to the conventional example, it is possible to flow a larger current to the coil, and a larger output can be realized.

Note that the present invention is not limited to the above-described embodiment, and the cooling fins 26 may be provided in a direction perpendicular to the direction of movement of the linear induction motor 20, as shown in FIG. 5, for example.

Further, as shown in FIG. 6, it is also possible to use a combination of cooling fins 27 oriented parallel to the traveling direction of the linear induction motor 20 and cooling fins 28 oriented perpendicular to the direction of movement of the linear induction motor 20. There are no restrictions on the direction or shape of the fins.

[Effects of the Invention] As described above, according to the present invention, the cover covering the coil end portion is molded and resin is cast inside the cover, and the coil end portion is impregnated with the resin, so that the cover and the coil It is integrated with the end portion, and can effectively prevent cracks in the resin and dielectric breakdown caused by vibrations and impacts during use. Furthermore, since cooling fins are provided on the cover that is integrated with the coil end, heat from the coil end can be effectively dissipated, and the upper temperature limit of the coil end can be significantly lowered. By applying the current to the coil, it is possible to increase the output. Furthermore, since the coil end portion is completely covered by the cover, dust and the like will not enter the coil end portion from the outside, and insulation breakdown due to dust and dirt can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a bottom view of the above embodiment, FIG. 3 is an explanatory diagram showing the temperature rise characteristics of the coil of the above embodiment, and FIG. 4 is an illustration of the above embodiment. FIG. 5 is a bottom view of another embodiment of the invention, FIG. 6 is a partially cutaway bottom view of still another embodiment of the invention, and FIG. The figure is a partially broken bottom view of the conventional example, FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 7, and FIG. be. 1... Vehicle body 2... Bogie 7... Track 8... Reaction plate 9... Iron core 10... Coil 11... Coil end portion 20... Linear induction motor 22... Cover 23...Cooling fin 24...Resin injection hole 25...Resin

Claims (1)

[Claims] This is a one-sided linear induction motor that is installed on the underside of the vehicle so as to face the reaction pullet on the track, and the coil ends that protrude on both sides of the central core are covered over the entire length. A linear induction motor is provided, wherein the cover is molded and the entire coil end portion is insulated by being injected with resin, and cooling fins are provided on the outer surface of the cover.