JPS63228903A - Linear induction motor - Google Patents

Abstract

PURPOSE:To uniform a temperature rise at respective sections in the front and rear directions of coil end sections, by discharging air taken in from the air intake guide member of one side cover, from the air intake guide member of another side cover. CONSTITUTION:During operation, running air is introduced into spaces 18 from open air intakes 26 at the front positions of side covers 16 on both left and right sides to cool coil end sections 9 and is discharged to an external section from open air exhaust ports 27 on the rear sides. At the same time, the running air is taken in respective air intake guide members 22 from vent holes 21 opening on the front sides in the infiltrating direction, and crosses the spaces 18 of the side covers 16, and passes the space 19 of an upper cover 17, and crosses the spaces 18 of the other side covers 16, and is discharged to the external section from the vent holes 23 of opposite side air intake guide member 24. By the flow of open air in the right and left directions, the right and left coil end sections 9 at the respective front and rear positions are cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a linear induction motor used for driving a vehicle.

(Prior Art) As a single-sided linear induction motor attached to the underside of a bogie for use in driving a vehicle, a configuration shown in FIGS. 5 and 6 is known. This conventional linear induction motor 1 is used by being attached to a truck 3 placed under the floor of a vehicle body 2. A linear induction motor 1 is supported by a support frame 4 on the side of the truck 3, and an axle 6 having wheels 5 on both sides thereof is supported.

This linear induction motor 1 has a central iron core 7.
is fixed by a support frame 4. This iron core 7 is provided with a large number of slots in the left-right direction, and the coil 8 is provided in the slots. Left and right coil end portions 9 of the coil 8,
9 protrudes from the iron core 7 on both sides, and the entire length of this coil end portion 9 is covered with side covers 10.10.
covered by. Both the front and rear surfaces in the longitudinal direction of the side cover 10 are open, and serve as an outside air intake port 11 and an outside air cultivation outlet 12.

A reaction plate 13 is installed below 7 of the linear induction motor 1 so as to be close to and opposite to it.

Therefore, by passing an alternating current to the coil 8,
An induced current flows through the reaction plate 13, and an induced magnetic field that is almost synchronized with the induced magnetic field generated in the iron core 7 is also generated in the reaction plate 13, and the north and south poles of these induced magnetic fields pull each other to generate a propulsive force, The motor 1 side is driven along the reaction plate 13 to cause the truck 3 to travel along the track 14. The heat generated by the coil 8 when the motor 1 runs enters into the side cover 10 from the outside air intake 11 at the front in the direction of movement of the truck 3, and is discharged to the outside from the outside air outlet 12 at the rear. The coil end portion 9 is removed by cooling it by ventilation.

(Problems to be Solved by the Invention) However, such conventional linear induction motors have the following problems.

Since the configuration is such that outside air is naturally ventilated into the side cover 10 by the running of the truck 3, the amount of ventilation is small and a sufficient cooling effect cannot be obtained. Particularly, the part of the bogie 3 of the vehicle body 2 is prone to turbulence in airflow due to running, and the flow of air flowing into the side cover 10 from the outside air intake port 11 becomes unstable.
In some cases, there may be almost no inflow. For this reason, in the step 81 of setting up the linear induction motor, it is necessary to provide a thermal margin, which inevitably leads to an increase in size.

Furthermore, since the linear induction motor 1 has an elongated configuration in the direction of movement, the temperature of the outside air that flows into the air passage 15 surrounded by the side cover 10 from the outside air intake port 11 increases as it moves backward. The cooling effect gradually decreases, and the temperature of the coil end portion 9 located at the rear with respect to the traveling direction increases. For this reason, it is necessary to provide a thermal margin that takes into account the temperature rise of the coil end portion 9 located at the rear with respect to the traveling direction, and a sufficient margin must be provided for the coil end portion 9 located at the front in the traveling direction. Even if there is, the overall capacity will have to be set to a low value. On the other hand, if the coil end portion at the rear position is to be sufficiently cooled, the lateral force bar 10 must be increased in size, and as a result, there is a problem in that the increase in size is unavoidable.

The present invention has been made to solve these conventional problems, and it is an object of the present invention to provide a linear induction motor that can be made smaller and have a larger capacity.

[Structure of the Invention] (Means and Actions for Solving the Problems) The linear induction mill motor of the first invention covers the coil end portions extending from the central iron core on both sides with side covers, and The upper part is covered by an upper cover, air intake guide members that open toward the front in the traveling direction of the truck are provided at multiple locations on the front and rear of one of the side covers, and air intake guide members that open toward the front in the forward and rearward direction of the truck are provided at multiple locations on the front and rear of the other side cover. An air intake guide member that opens toward the rear in the traveling direction is provided, and the air intake guide members located at opposite positions on the left and right sides of the both side covers are communicated with each other through a space between the up cover and the iron core. It is something.

In this linear sinduction motor, the running wind generated by the running of the truck is taken into the side cover from an air intake guide member that opens toward the front in the direction of travel, and the coil end part covered by the side cover. The air flows through the space between the upper cover and the iron core to the coil end on the opposite side, and after cooling this coil end, it is discharged to the outside through an air intake guide member that opens toward the rear in the direction of travel. be done.

Therefore, the air intake guide members provided at multiple locations in the front and rear of each side cover can each take in outside air, so cold outside air can be taken directly into the side cover regardless of its position in the forward or rear direction of travel. This allows the coil end portion to be cooled, suppressing imbalance in temperature distribution in the front and rear directions of travel, and achieving effective cooling.

In the linear induction motor of the second invention, the coil end portions protruding from the central iron core on both the left and right sides are covered by side covers, and the upper and lower surfaces of both side covers are provided at multiple locations front and rear in the direction of movement @ opposite to each other. An air intake guide member that opens in the opposite direction is provided, and these upper and lower air intake guide members are communicated through a space surrounded by the side cover.

In this linear induction motor, while the trolley is running, running air is taken into the side covers from the air intake guide members that open forward in the direction of travel on each of the left and right side covers, cools the coil ends, and then flows toward the rear in the direction of travel. The air is discharged to the outside from the air intake guide member on the opposite side of the opening.

Therefore, it is possible to directly take in outside air and cool the coil end portions located either forward or backward in the traveling direction, and effective cooling can be performed on the coil end portions located either forward or backward in the traveling direction.

(Example) Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

1 and 2 show an embodiment of the first invention. As shown in FIGS. 5 and 6 as the conventional example, this linear induction motor 1 has a support frame 4 attached to the lower side of a bogie 3 of a car body 2, and an iron core 7 attached to a reaction plate 13 on a track 14. are placed close to each other and energized to the coil 8 to generate an induced magnetic field.
It is made to run by the mutual pulling of the poles.

Therefore, the same reference numerals are given to the constituent members having the same configuration and operation as in the conventional example, and the explanation thereof is omitted.

The coil end portions 9 on both the left and right sides of the coil 8 are covered over their entire length by side covers 16. iron core 7
The upper part of is covered by an upper cover 17. The space 18 surrounded by the left and right side covers 16° 16 and the space 19 surrounded by the upper cover 17 are communicated through air holes 20 and 20 formed in the support frame 4.

Air intake guide members 22 having ventilation holes 21 that open toward the front in the traveling direction are provided at a plurality of locations in the front and rear of one of the left and right side covers 16.16 so as to communicate with the space 18.

Air intake guide members 24 having ventilation holes 23 that open toward the rear in the traveling direction are provided at a plurality of locations in the front and rear of the other side cover 16 on the left and right so as to communicate with the space 18 of the side cover 16. There is. Further, in the case of the embodiment, a partition plate 25 is provided in the space 19 formed by the upper cover 17 in order to improve air circulation between the left and right air intake guide members 22 and 24.

Further, the front end surfaces of the left and right side covers 16.16 are open as an outside air intake 126, and the rear end surfaces are open as an outside air outlet 27.

In the linear induction motor 1 having the above configuration, the first
When traveling in the direction shown by the arrow in the figure, air enters the space 18 from the outside air intake ports 26.26 located in front of the left and right side covers 16.16 and flows rearward, causing the coil end portion 9 While cooling the air, it exits from the outside air outlet 27 at the rear.

At the same time, the running wind is taken into each air intake guide member 22 from the vent 21 that opens forward in the direction of travel, crosses the space 18 of the side cover 16, and fills one space of the upper cover 17. through the other side cover 16 roughly.
air intake guide member 2 on the opposite side across the space 18 of
It is discharged to the outside from the vent 23 of No. 4. Due to this flow of outside air in the left and right direction, the left and right coil end portions 9.9 located at the front and rear positions are directly cooled by the cold outside air.
can be cooled evenly.

When the direction of travel is reversed, outside air is taken in through the vent 23 that was previously open at the rear, and is now exhausted to the outside through the vent 21 on the opposite side, providing the same cooling effect. .

3 and 4 show an embodiment of the second invention,
Components designated by the same reference numerals as those of the conventional linear induction motor 1 shown in FIGS. 5 and 6 perform the same structural functions.

The feature of this embodiment is that the side covers 28.2
8, and air intake guide members 29 to 32 are provided on the upper and lower surfaces of each side cover 28, respectively. The air intake guide member 29 on the upper side of one of the side bars 28, 28 has a ventilation hole 33 that opens toward the front in the direction of travel, and the air intake guide member 30 on the lower side has an air intake that opens toward the rear in the direction of travel. It has an inlet 34.

Further, the air intake guide member 31 on the other upper surface side of the side cover 28, 28 has a ventilation hole 35 that opens in the direction fJC toward the rear in the direction of travel, and the air intake guide member 32 on the lower surface side has a ventilation hole that opens toward the front in the travel direction. It has 36.

Note that the front end faces in the traveling direction of both the left and right side covers 28.28 are open as an outside air intake port 37, and the rear end faces in the traveling direction are open as an outside air outlet 38.

In the linear induction motor of this embodiment, the trolley 3
As the vehicle runs, air is taken into the side cover 28 from the outside air intake port 37, cools the coil end portion 9, and is discharged to the outside from the outside air outlet 38 at the rear. At the same time, the traveling wind is taken into the side cover 28 from the ventilation r133.36 which opens in the forward direction of the air intake guide member 29. vents 34 and 35 to the outside,
Due to the circulation of the traveling wind in the vertical direction, each part of the coil end part 9 in the front and back direction is directly cooled by the outside air, and uniform cooling can be performed.

When the direction of movement of the linear induction motor 1 is reversed, outside air is taken into each air intake guide member 30, 31 from the ventilation port 34, 35 that is open on the rear side,
The air passes through the side cover 28 and is discharged to the outside from a vent hole 33.36 that opens in front of the air intake guide member 29.32 on the opposite side, so that the coil end portion 9 can be effectively cooled in the same way.

In this way, in each of the above embodiments, the air intake guide members provided at multiple locations in the front and rear of the side cover take in the running wind, and exhaust it to the outside from the air intake guide members located on the left and right or top and bottom opposite sides. Each part of the coil end part can be directly cooled by outside air, and it is possible to perform effective cooling and equalize the temperature rise in each part of the coil end part in the front and rear direction.

[Effects of the Invention] As described above, according to the first invention, the air taken into the side cover from the air intake guide members provided at multiple locations in the front and back direction of one side cover is transferred to the other side cover. Exhaust from air intake guide members installed at multiple locations in the front and back directions,
The flow of cooling air that crosses the linear motor from side to side allows the coil end portions to be directly cooled by cold outside air at multiple locations in the front and back direction. Further, according to the second invention, the cooling air taken in from the air intake guide member on the upper surface or the lower surface side of each side cover is discharged to the outside from the air intake guide member on the vertically opposite side. The end portion can be cooled by outside air flowing in the vertical direction, and the coil end portion can be directly cooled by cold outside air at multiple locations in the front and rear directions.

Therefore, unlike the conventional method in which the coil end portions at the front and rear positions are cooled by a cooling layer taken in from the outside air intake at the front end of the elongated side cover, the temperature of the cooling air increases as it goes toward the rear in the direction of travel. There is no problem that the cooling effect decreases due to TR, and the coil end portions of each portion in the front and rear directions can be effectively cooled. As a result, the current capacity can be increased if the size of the side cover is the same, and the size can be reduced when trying to obtain the same output.

[Brief explanation of drawings]

FIG. 1 is a bottom view of an embodiment of the first invention, FIG. 2 is a sectional view taken along line II-I in FIG. 1, FIG. 3 is a side view of an embodiment of the second invention, and FIG. 3 is a sectional view taken along the line rV-IV, FIG. 5 is a plan view of the conventional example, and FIG. 6 is an enlarged sectional view taken along the line VI-VI in FIG. 1... Rear induction motor 2... Vehicle body 3... Bogie 4... Support frame 7... Iron core 8... Coil
9...Coil end part 16...Side cover
17... Upper cover 21... Vent port 22... Air intake guide member 23... Vent port 24... Air intake guide member 28... Side cover

Claims (2)

[Claims] (1) A linear induction motor is installed on the underside of a bogie facing a reaction plate installed on the track, and the coil end parts that protrude from the central iron core on both the left and right sides are covered by side covers. At the same time, the upper part of the iron core is covered by an upper cover, and air intake guide members that open toward the front in the traveling direction are provided at multiple locations in the front and rear of one of the side covers, and An air intake guide member that opens toward the rear in the traveling direction is provided at the location, and the air intake guide members located at opposite positions on the left and right sides of the both side covers are connected to each other through the space between the upper cover and the iron core. A linear induction motor that communicates with each other. (2) A linear induction motor is installed on the underside of a bogie facing a reaction plate arranged on a track, and the coil end parts that protrude from the central iron core to both the left and right sides are covered by side covers. air intake guide members opening in opposite directions to each other in the front and rear of the traveling direction are provided at multiple locations in the front and rear of the upper and lower surfaces of both side covers, and a space surrounded by the side covers between these upper and lower air intake guide members; A linear induction motor that communicates through.