JPH02220964A - Cooler for linear motor - Google Patents

Abstract

PURPOSE:To ensure the cooling of a coil within protective covers by providing at the protective covers outer air taking in openings which protrude toward the outside from a perimeter wall and take running air into the inside of the covers. CONSTITUTION:The protruding portions 25a, 25a of a coil 25 protruding from a layered iron core 23 to side parts are surrounded with protective covers 27, and a number of penetrating holes 29 for ventilation are provided and at the same time, coil portions 25a being hit with small stones or the like is prevented. Outer air taking in openings 31 covered with protection nets are provided at the front and the rear at the perimeter wall of the protective covers 27, and they are provided in such a way as to protrude from the perimeter wall to side parts so that running air may be led into the protective covers 27 at the times of advance and retreat. As a result, heat generated at the coil 25 is made to go to the outside through penetrating holes 29 by running air, and the coil 25 is stably cooled at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) This invention relates to a cooling device for a linear motor.

(Prior Art) In general, a linear motor includes a reaction plate which is laid along a track and serves as a secondary stator, and a coil which is provided on the bogie side and faces the reaction plate and is installed in a slot in an Mk layer core. It consists of a built-in primary side mover, and when an alternating current flows through the negative side mover, a traveling magnetic field is generated on the primary side. As is well known from Lenz's law, this traveling magnetic field induces eddy currents in the reaction plate, which is the secondary side, and the interaction between the eddy currents and magnetic flux creates a propulsive force (
9.

(Problem to be Solved by the Invention) As described above, the primary side mover provided on the bogie side has the coil protruding from the laminated iron core to both sides from where the coil serving as the primary winding is installed in the slot of the 81-layer iron core. It becomes like this.

For this purpose, the portion of the coil that protrudes from the laminated core is surrounded by a protective cover to protect the coil from, for example, flying stones. In this case, the protective cover has many through holes for ventilation, allowing the heat generated inside to escape to the outside.

However, because the diameter of the through-hole is set small to prevent thrown up stones from passing through, the intake of outside air is poor.
Moreover, the problem was that the heat did not escape to the outside, so it tended to get trapped. In particular, the capacity ff1 (output) of the linear motor is
Since it is restricted by the coil temperature, an increase in the temperature inside the protective cover will lead to a decrease in output.

For this reason, for example, by increasing the diameter of the through hole, the heat problem can be solved to some extent, but on the other hand, there is a risk that the protective cover will no longer function.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cooling device for a linear motor that functions as a protective cover and can reliably take in outside air.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a rear cushion plate that serves as a secondary stator laid along the track, and and a primary side movable element which is provided on the rear cushion plate and has a coil incorporated in a slot of the laminated iron core, and a protruding part of the coil that projects laterally from the laminated iron core is used for ventilation. In a near motor surrounded by a protective cover having a through hole, the protective cover is provided with an outside air intake port that projects outward from the peripheral wall of the cover and takes in the running wind into the inside of the protective cover.

(Function) According to such a cooling device for a linear motor, when the coil bounces, the coil is not affected because the coil hits the protective cover. Next, since the traveling air is taken in sequentially from the intake port into the protective cover, the heat inside escapes to the outside through the through holes, which prevents heat from staying inside and allows stable cooling of the coil. It becomes possible.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 4.

In FIG. 2, 1 indicates the vehicle body, 3 indicates the bogie, 5 indicates the wheels, and 7 indicates the inside of the track. Rails 9 are laid within the track, the wheels 5 are placed on the rails 9, and the bogie 3 is supported via these wheels 5 so that it can run.

A reaction plate 11 serving as a secondary stator is laid between the rails 9 along the longitudinal direction. The reaction plate 11 is composed of a band-shaped magnetic plate 15 set on a base 13 and a band-shaped conductor plate 17 superimposed and bonded on top of the magnetic plate 15.

On the other hand, the reaction plate 1 is provided on the bottom side of the vehicle body 3.
A primary movable element 19 is provided which faces the primary movable element 1 .

The primary side mover 19 has a structure in which a coil 25 serving as a primary winding is incorporated into a slot of a W4-layer iron core 23 supported by a support member 21, and when alternating current flows through the coil 25, a traveling magnetic field is generated. .

Projecting portions 25a, 25a of the coil 25 projecting from the laminated core 23 to both sides are surrounded by a protective cover 27.

The protective cover 27 has a cross-sectional shape, and the internal space forms a ventilation passage W continuous in the longitudinal direction.

The upper end side is fixed to the support member 21, and the lower end side is fixed to the laminated iron core 23, and a large number of through holes 29 for ventilation are provided in the peripheral wall including the front end and rear end surfaces.

The diameter of the through hole 29 is set to a diameter through which pebbles and the like cannot easily pass through.

Furthermore, outside air intake ports 31 are provided on the front and back of the peripheral wall of the protective cover 27, and a protective net is stretched over the outside air intake ports 31. The outside air intake port 31 can move forward (when arrow A) and backward (
It protrudes laterally from the peripheral wall and faces forward and rearward, respectively, so that the traveling wind is guided into the protective cover 27 via the guide plate 33 at the time indicated by the arrow. The outside air intake ports 31 may be provided back to back as shown in FIG. 5, or the outside air intake ports 31 may be additionally provided on the upper surface side of the peripheral wall of the protective cover 27 as shown in FIG. It is also possible to do so.

According to the linear motor configured in this way, when an alternating current is applied to the coil 25 of the negative movable element 19, a traveling magnetic field is generated. This traveling magnetic field induces an eddy current in the rear cushion plate 11, which is the secondary side, according to Lenz's law, and a propulsive force is obtained by the interaction between the eddy current and the magnetic flux. When the vehicle body 1 is running, running wind is sequentially taken into the protective cover 27 from the outside air intake port 31. Therefore, heat escapes to the outside through the through hole 29 without being accumulated, and outside air can be taken into the protective cover 27 without any problem during the forward or return trip.

In this case, as shown in FIG. 4, at points 0 and d, which are on the rear end side of the protective cover 27, the cooling air that has finished its work and warmed up flows from the front end side, which is points a and b, but the outside air Since outside air is always taken in from the intake port 31, the temperature change rate is suppressed to a substantially constant rate from point a to point d, as shown by the solid line.

Therefore, as shown by the broken line, the H-minute temperature can be lowered compared to the conventional temperature change rate without the outside air intake port 31, and a stable cooling state of the coil 25 can be obtained over the entire area.

On the other hand, if a rock or the like hits the protective cover 27, the coil 25 will not be damaged.

[Effects of the Invention] As described above, according to the linear motor cooling device of the present invention, the coils can be protected when stones or the like hit the protective cover. In addition, the outside air intake port ensures that the running wind can be taken in.
Stable cooling of the coil is possible over the entire area, and there is no reduction in capacity (output) due to the effects of heat.

[Brief explanation of the drawing]

Figure 1 is a bottom view of the car body in which this invention is implemented, as seen from below.
Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, Figure 3 is an enlarged cutaway plan view of the main parts, Figure 4 is an explanatory diagram showing the rate of temperature change inside the protective cover, and Figure 5 is FIG. 6 is a cutaway plan view similar to FIG. 3 showing a modified example of the outside air intake port, and FIG. 6 is a partially cutaway sectional view showing another modified example of the outside air intake port. 3...Dolly 11...Reaction plate 19...-Next side mover 23...Laminated core 25...Coil 27...Protective cover 29...Negative through hole 31...Outside air intake entrance

Claims (1)

[Claims] A rear cushion plate serving as a secondary stator is laid along the track, and a primary movable element is provided on the bogie side and is mated with the rear cushion plate and has a coil incorporated in a slot of a laminated core. The protrusion of the coil that protrudes laterally from the laminated core is surrounded by a protective cover having a through hole for ventilation. A cooling device for a linear motor, characterized in that an outside air intake port is provided for introducing outside air into the inside of the protective cover.