JPH02184204A - Coil cover for vehicle linear motor - Google Patents

Abstract

PURPOSE:To prevent intrusion of foreign matter from outside while ensuring ventilation by arranging many recesses and protrusions through press on the under face cover plate section and making vents at the rising side face section of the recess or the protrusion. CONSTITUTION:Many vents 23 are punched through the upper face cover 20a and the outside face cover 20c of a coil cover 20 for covering the coil end sections 9a projecting to the opposite sides of the core for a linear motor. Many recesses 24 are arranged through press in the under face cover plate section 20b, where rising side face sections in front and rear of each recess 24 are opened as a vent 25. Since the vents 23, 25 do not face with the rail face, foreign matter such as rubble does not enter from the rail face into the coil cover 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a coil cover with ventilation holes that covers and protects the coil end portions protruding on both sides of the core of a linear motor for a vehicle.

(Prior Art) In recent years, in railway vehicles, linear motors are used as means for propelling the vehicle, and near-motor cars are becoming more popular.

This linear motor car generally has the configuration shown in FIG. 10, in which a linear motor 3 is installed on a bogie having left and right wheels 2 at the bottom of a vehicle 1, and a track is laid with left and right rails 4 on which the left and right wheels 2 can be moved. A secondary conductor 5 such as an aluminum plate is fixed at the upper center so as to face the linear motor 3 on the vehicle side with a small gap G therebetween. Thrust is generated between the secondary conductor 5 and the linear motor 3 serving as the primary side to cause the vehicle 1 to travel.

Here, the near motor 3 provided at the bottom of the vehicle 1 includes an iron core 6 formed by laminating a large number of iron plates, etc., a plurality of iron core end plates 7 overlapping each other on both the left and right sides of the iron core 6, and further arranged on the left and right sides of the iron core 6. The core holder 8 also serves as a frame for clamping and fixing the core 6 and core end plates 7, and a coil 9 is provided so as to be fitted into a slot formed at the bottom of the core 6 and core end plates 7. Coil end portions 9a of the coil 9 of the linear motor 3 that protrude left and right from the iron core 6 are each covered and protected by a coil force bar 10.

As shown in FIG. 10 and FIG. 12, the coil cover 10 has a U-shaped cross section consisting of an upper cover plate portion 10a, a lower cover plate portion 10b, and an outer cover plate portion 10c, and the upper cover plate portion 10b has a U-shaped cross section. By fixing the inner rising edge 10a' of the plate part 10a to the core holder 8 with bolts 11, and fixing the inner edge of the lower surface cover plate part 10b to the lower surface of the core end plate 7 with bolts 12, the coil end part is fixed. The coil is fixed to cover the coil 9a to protect the coil from foreign objects that may be thrown up from the orbit or the like.

In addition, this coil cover 10 adopts a natural cooling method and in order to improve the cooling characteristics of the near motor 3, the upper and lower cover plate parts 10a and 10b as well as the outer cover plate part 10
A large number of ventilation holes 13 are made in c by punching etc.
Outside air such as running wind flows in and out from these, and heat generated by the coil 9 is discharged to the outside of the coil cover 10.

(Problems to be Solved by the Invention) By the way, in the conventional coil cover 10 of the vehicle linear motor described above, in order to efficiently discharge the heat generated from the internal coil 9 to the outside, the upper and lower cover plate portions 10a,
It is necessary to make the ventilation holes 13 as large as possible and as many as possible in the outer surface cover plate portion 10b and the outer surface cover plate portion 10c to increase the ventilation opening area. However, in such a case, in order to make use of the linear characteristics of this type of linear motor car to create a low-floor vehicle, the height dimension A from the track surface to the linear motor 3 is extremely large, even including the gap G, as shown in Figure 12. When running at high speed in such narrow conditions, foreign matter B such as crushed stone fragments scattered on the track surface is often thrown up, and the thrown up foreign matter B is blocked by the ventilation of the coil cover 10 as shown by the dotted line arrow. There was a problem in that there was a high risk that it would pass straight through the hole 13 and directly hit the internal coil end portion 9a, destroying the insulation of the coil and leading to a layer short circuit of the coil. In addition, the foreign matter B that has been thrown up fits completely into the ventilation hole 13 of the coil cover 10, and the lower cover plate part 1
Many of the ventilation holes 13 of the cover 0b are often blocked, which obstructs the flow of air from the bottom to the top of the cover, resulting in a decrease in cooling efficiency and a problem in that the temperature of the coil 9 increases.

In other words, to improve the cooling characteristics of the linear motor 3,
While it is necessary to make the ventilation holes in the coil cover 10 as large and as numerous as possible, it is also necessary to prevent foreign matter from entering the coil cover 10 in order to prevent damage to the coil.
It was quite difficult to create a configuration that satisfied both of these requirements.

The present invention was developed in view of the above circumstances, and is an emergency system that secures a ventilation opening area necessary and sufficient to improve the cooling characteristics of a linear motor, while preventing foreign matter such as crushed stones from entering from the outside and reliably protecting the coil. The purpose is to provide highly safe coil covers for linear motors for vehicles.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the coil cover for a linear motor for a vehicle of the present invention has a large number of concave portions or convex portions appropriately arranged at least on the lower cover plate portion by press molding. It is characterized by having a ventilation hole opened in the rising side surface of the concave portion or convex portion.

(Function) With the above configuration, in the coil cover for a linear motor for a vehicle according to the present invention, the ventilation holes of the lower cover plate are opened at the rising side surfaces of the recesses or protrusions press-molded on the lower cover plate. , since it does not face the track surface, even if foreign objects such as crushed stone fragments are thrown up from the track surface by the wind when the vehicle is running, etc., they will not hit the top plate of the concave or convex part and fall. This eliminates the possibility of foreign matter passing straight through the ventilation hole and directly hitting the internal coil. In addition, the outside air (cooling air) from below flows smoothly into the interior through the ventilation holes opened on the rising side of the concave or convex portion of the bottom cover plate, and the heat generated by the coil is discharged to the outside. It becomes like this.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. Components in the figure that overlap with those shown in FIGS. 10 to 13 are given the same reference numerals to simplify the explanation.

Here, 20 in the figure indicates a coil cover that covers and protects the coil end portions 9a protruding from both sides of the iron core 6 of the vehicle lower linear motor 3. Like the conventional coil cover 20, the coil cover 20 has a U-shaped cross section consisting of an upper cover plate portion 20a, a lower cover plate portion 20b, and an outer cover plate portion 20c. Then, the inner rising edge 20a' of the upper cover plate part 10a is fixed to the core holder 8 with bolts 11, and the inner edge of the lower cover plate part 20b is attached to the lower surface of the core end plate 7 with bolts 11.
2, the coil end portion 9a is fixed in a state covering the coil end portion 9a, and the coil is protected from foreign objects that are rolled up from the orbit or the like.

In order to improve the cooling characteristics of the coil cover 20 and the near motor 3, a large number of ventilation holes 23 are made by punching or the like in the upper surface cover plate part 20a and the outer surface cover plate part 20c as in the past, while the lower surface cover plate Part 20b
A large number of four parts 24 are formed by press molding in an appropriate arrangement, and the front and rear rising side surfaces of each part 24 are opened as ventilation holes 25. In other words, as shown in FIG. 3, a large number of recesses 24 are formed by pressing the lower cover plate part 20b inwardly (upper side) to form a substantially trapezoidal shape, and the top plate part 24a of each recess 24 is Leaving the upward side plate section 24b, the other two rising side sections on the front and rear sides in the direction of vehicle movement are completely punched out to form ventilation holes 25. The inward protrusion height h of the recessed portion 24 is appropriately selected within a range that does not contact the internal coil end portion 9a.

Thus, in the case of the coil cover 20 for a vehicle linear motor having the above-described configuration, the ventilation hole 25 of the lower cover plate portion 20b
However, there is a recess 2 press-molded on the lower cover plate portion 20b.
Openings are made on the front and rear rising sides of 4 and do not face the track surface, so even if foreign objects B such as crushed stone fragments are thrown up from the track surface by the vehicle wind, etc. There is no possibility that the foreign matter B hits the top plate part 24a of the fourth part 24 and falls, passes straight through the ventilation hole 25, and directly hits the internal coil 9. In addition, the outside air (cooling air) from below flows into the interior through the ventilation holes 25 opened on the front and rear rising sides of the recess 24 of the lower cover plate part 20b, and the heat generated by the coil is efficiently transferred to the outside. It will drain better.

A plurality of horizontally long groove-shaped recesses 34 that are long in the width direction (the left-right direction perpendicular to the vehicle traveling direction) are press-molded in parallel on the lower surface cover plate portion 20b of the 20, and the horizontally long front and rear rising side surfaces of each of the four portions 34 are formed. This is a configuration in which a ventilation hole 35 is opened.

In addition, in the case of FIGS. 6 and 7, the lower cover plate portion 20b of the coil cover 20 is provided in the longitudinal direction (vehicle traveling direction).
A plurality of four elongated groove-shaped portions 44 are press-molded in parallel in parallel, and the laterally elongated left and right rising side surfaces of each recess 44 are opened as ventilation holes 45.

Furthermore, in the case of Figs. 8 and 9, the coil force/(-20
A plurality of recesses 54 in the form of horizontal grooves that are long in the width direction (left and right directions perpendicular to the direction of vehicle travel) are press-molded in parallel in the lower cover plate portion 20b, and each recess 54 in the front half in the direction of vehicle travel is shaped like this. The horizontally elongated rising side surface of only the rear side is opened as a ventilation hole 55, and each of the recesses 54 in the rear half in the vehicle traveling direction is configured such that this horizontally elongated rising side surface of only the front side is opened as the ventilation hole 55.

In each of these embodiments, as in the first embodiment, it is possible to obtain the effect of safely protecting the coil 9 from direct hit by foreign objects without impairing the cooling characteristics of the coil 9. In addition, in the last embodiment shown in FIGS. 8 and 9, only either the front or rear side of the horizontally elongated rising side surface of the recess 54 is opened as the ventilation hole 55, so each recess 54 functions as a reinforcing rib. The rigidity of the entire cover is increased, making it less likely to be damaged, and the four parts 5
4 serves as a guide for air intake, and the inflow of running air becomes smoother, thereby improving the cooling characteristics of the coil.

In each of the above embodiments, the lower cover plate portion 20b
The recesses 24, 34, 44.54 were press-molded only on the raised sides, and the ventilation holes 25, 35°45.55 were opened on the rising sides of the recesses 24, 34, 44.54.
It is also possible to form it at 0c.

Further, as described above, the lower cover plate portion 20b is press-molded so as to be recessed inwardly (upper side) so that the recesses 24, 34...
. Instead, the lower cover plate portion 20b may be press-molded so as to protrude outward (downward) to form a convex portion (not shown).

〔Effect of the invention〕

Since the present invention is constructed as described above, the ventilation holes of the lower cover plate are opened in the rising side of the recess or protrusion press-molded on the lower cover plate, and do not face the raceway surface. This makes it extremely safe, ensuring sufficient ventilation opening area to improve the cooling characteristics of the linear motor, while also preventing foreign objects such as crushed stones from entering or directly hitting the coil, ensuring protection of the coil. A coil cover for a vehicle linear motor with high durability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is an enlarged perspective view of part A in FIG. 2. FIG. 4 is a sectional view of main parts showing another embodiment of the present invention, FIG. 5 is a bottom view of FIG. 4 seen from below, and FIG.
7 is a bottom view of FIG. 6 seen from below, and FIG. 8 is a sectional view of essential parts showing still another embodiment of the present invention. 9 is a partially sectional external view of FIG. 8, FIG. 10 is a cross-sectional view of a schematic configuration of a linear motor car showing a conventional example, and FIG. The perspective view shown in FIG. 12 is a sectional view of a part of the coil cover of the same conventional linear motor. 1...Vehicle, 3...Linear motor, 6...Iron core,
9...Coil, 9a...Coil end part, 20...
・Coil cover 20b...lower cover plate part, 24,
34゜44.54... recess, 23, 25, 35.45
゜55...Vent hole. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (1)

[Claims] A coil cover with ventilation holes that covers and protects the coil end parts that protrude on both sides of the core of a linear motor for vehicles.
At least the lower cover plate portion is formed with a large number of concave portions or convex portions appropriately arranged by press molding, and the ventilation holes are opened in the rising side surfaces of the concave portions or convex portions. Coil cover for linear motors for vehicles.