JPH01303045A - Secondary conductor of linear induction motor - Google Patents

Abstract

PURPOSE:To shorten the length downwards, to reduce oscillating quantity and to prevent the secondary conductor from being damaged due to the contact with the primary conductor. CONSTITUTION:In a reaction plate 3 disposed upright from the floor of a casing 2 downwards, its downward tip part is formed by a material 12 of conductivity higher than that of its upper side, of which the cross-section is formed circular. The flow of eddy current 11 in the part of the material 12 is thereby improved and the length downwards can be shortened by that part. Since the cross-section of the material 12 is made circular, it will be the greatest. The reaction plate 3 becomes so shortened that the oscillating quantity will be reduced, contact will be made with neither a stator 9 nor a coil, and the damage due to the contact can be prevented.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention applies time-varying magnetic flux from a primary conductor to a secondary conductor, and travels through a conveyed object to which the secondary conductor is attached. This relates to the secondary conductor of a linear induction motor.

(Prior art) In the past, a time-varying magnetic flux was applied from a primary conductor (stator) to a secondary conductor (mover), and this magnetic flux caused two
There is a linear induction motor that generates an eddy current in a secondary conductor, generates a propulsive force in the secondary conductor based on the relationship between the eddy current and magnetic flux, and moves a conveyed object to which the secondary conductor is attached.

FIG. 4 is a schematic perspective view showing an example of a conveyance system using such a linear induction motor, FIG. 5 is a longitudinal cross-sectional view of a conveyance path for a conveyed object, and FIG. It is a cross-sectional view showing the B cross section.

In FIGS. 4 and 5, a reaction plate 3 serving as a secondary conductor is erected at the lower end of a casing 2 in which articles can be loaded on the conveyed object 1. As shown in FIGS. This reaction plate 3
is a metal plate made of iron, aluminum, etc.
Propulsive force or reverse propulsive force is applied based on the magnetic flux generated from the stator 9 as a secondary conductor.

In addition, a total of four wheels 4 each having a circumferential surface protruding from the width of the housing 2 are provided on the conveying front end side and the conveying second end side with respect to the conveying direction A of the conveyed object 1. has been done.

Further, on both sides of the housing 2 in the transport direction A of the transported object 1, a total of eight wheels 5 are arranged, four on each side. The conveyance path 6 for the conveyed object 1 is formed by arranging guide rails 7.7 each having an opening-shaped cross section and facing each other with the opening ends of the opening facing inward. The distance a between the inner surfaces of the guide rails 7.7 corresponds to the distance a between the conveyed objects 1 formed by the wheels 4, 4.
It is slightly longer than the length b in the width direction.

Moreover, the separation distance C formed by the face-shaped facing surfaces of the guide rail 7 is slightly longer than the diameter d of the wheel 5. A 4'fJ motor 8 is linearly provided below the conveyance path 6. This linear induction motor 8 is
It consists of a reaction plate 3 as a secondary conductor attached to the housing 1, and a pair of stators 9, 9, etc. as secondary conductors arranged oppositely across the conveyance path of the reaction plates 1 to 3. There is. As shown in FIG. 6, the stators 9, 9 are laminated with teeth and teeth punched out from iron plates, and a coil is wound around each surface. Incidentally, a gap of a certain distance q is provided between the reaction plates 1 to 3 and the stator 9.

In such a configuration, when a two-phase or three-phase alternating current is passed through the coil of the stator 9, a magnetic flux is generated that passes through the reaction plate 1 and 3 through the gap q, as shown by the broken line 10 in FIG. . Since this magnetic flux 10 is alternating current, eddy currents 11 as shown in the side view of FIG. 7 are generated in the reaction plates 1 to 3 according to Lenz's law. Here, since the magnetic flux density in the gap q forms a moving magnetic field, the product of this magnetic flux density and the eddy current is J: A continuous propulsive force is generated according to Refleming's left hand rule. This propulsive force becomes a propulsive force in the opposite direction by passing an alternating current of opposite phase through the coil of the stator 9.

As a result, the reaction plate 3 is installed (P1, -
The conveyed object 1 can be moved forward or backward along the conveyance path 6.

By the way, if the path of eddy current is widened, the loss will be reduced and propulsive force can be generated more efficiently.

Therefore, conventionally, as shown in the longitudinal cross-sectional view of FIG. 8(a),
There is a method of making the cross-sectional area of the lower end of the reaction plate 3 larger than other parts, or a method of extending the lower end of the reaction plate 3 as shown in FIG. -1 to 3
There is a need for a way to widen the path of eddy current by bending the lower end of the eddy current.

(Problem to be Solved by the Invention) However, in any of the configurations shown in FIGS. 8(a) to 8(C), the lower tip of the reaction plate 3 swings due to vibrations when the conveyed object 1 travels. There has been a problem in that the tip comes into contact with the stator 9 and the coils, causing damage to the tip portion or damage to the stator 9 and the coils.

The object of the present invention is to provide two
It is an object of the present invention to provide a secondary conductor for a linear induction motor that can prevent damage to the secondary conductor or the primary conductor.

[Configuration of Defense] (Means for Solving the Problems) The present invention is characterized by configuring the lower tip of the secondary conductor with a high-conductivity molybdenum, preferably having a circular cross section. , which achieves the above objectives.

(Function) By configuring the lower tip of the secondary conductor with a material with higher conductivity than other parts, the flow of eddy current in this lower tip becomes better, and the downward length is shortened accordingly. can do.

By shortening the downward length of the secondary conductor, the amount of oscillation due to vibration will be reduced, and contact with the primary conductor will be eliminated, thereby preventing damage to the primary conductor.

(Embodiment) FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a side view of reaction plates 1 to 1, which are installed vertically from the floor of the casing 2. -1 to 3 have lower tip portions made of A12 material with higher conductivity than the upper side, and have a circular cross section.

If the material 13 above it is made of iron, for example, the material 12 is made of aluminum. If the material 13 is made of aluminum, it is made of copper.

By using the highly conductive material 12 at the lower tip of the reaction plate 3, the flow of the eddy current 11 in this part is improved, and the downward length of the reaction plate 3 can be shortened accordingly. can. In this case, since the cross-sectional area of the material 12 is circular, the cross-sectional area is the largest,
The flow of eddy current can be further improved, and the balance of the transported object 1 in the left-right direction can also be improved, and the amount of rocking caused by vibration can be reduced.

In this way, the flow of wax current at the lower tip of the reaction plate 3 is improved by the high conductivity monthly rate 12, and as a result of shortening the downward length, the reaction plate 3 The amount of oscillation is also reduced, and there is no contact with the stator 9 or the coils, making it possible to prevent damage to them. Further reaction play-1
By shortening the downward length of ~3, its weight is also reduced, making it possible to move the conveyed object 1 with a small propulsive force. This has the advantage that the noise generated is also reduced.

Note that, as shown in the side view of FIG. 3, tapered portions 14. In the case of M4 construction, which is equipped with a 15 mm diameter to reduce the impact from obstacles that enter the conveyance path, only the portion where eddy currents are generated, which effectively contributes to the generation of propulsion force, needs to be made of high conductivity material. .

Further, the vertical cross section of the high conductivity 4A material 13 is not circular, but can also have a rounded shape such as an oval shape.

[Effects of the Invention] As explained below, according to the present invention, since the lower tip of the secondary conductor is made of a material with high conductivity, it becomes possible to shorten the downward length. As a result, it is possible to reduce the amount of oscillation of the secondary conductor caused by the vibration of the conveyed object, without hindering the flow of eddy current, and to prevent damage that would otherwise occur due to contact with the primary conductor. . Furthermore, since the weight of the secondary conductor is also reduced, effects such as being able to reduce the propulsive force by that amount can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conveyed object and a conveyance path showing an embodiment of the present invention, FIG. 2 is a side view of a reaction plate, and FIG.
The figure is a side view showing another structural example of the reaction plate.
FIG. 4 is a perspective view showing the general configuration of the conveyed object and the conveyance path, FIG. 5 is a vertical sectional view showing the general configuration of the conveyed object and the conveyance path, and FIG. 6 is B-8 in FIG. A cross-sectional view showing the cross section, FIG. 7 is a side view of the reaction plate, and FIGS. 8(a)-
(C) is a vertical sectional view showing the structure of conventional reaction play-1. DESCRIPTION OF SYMBOLS 1...Transferred object, 2...Housing, 3...Reaction play-1~, 4.5...Wheel, 6...Transportation path, 7.
...Guide rail, 8...Linear induction motor, 9...
・Stator, 10... Magnetic flux, 11... Eddy current, 1
2...High conductivity material. Representative Patent Attorney Takahisa Ki Toshi

Claims (2)

[Claims] (1) It has a secondary conductor erected downward from the floor surface of the conveyed object, and primary conductors placed facing each other at a predetermined distance on both sides of the secondary conductor, and In a linear induction motor that generates a propulsion force in the secondary conductor by applying a time-varying magnetic flux to the secondary conductor from the primary conductor to cause the conveyed object to travel, the lower tip of the secondary conductor is made to have a high conductivity. A secondary conductor for a linear induction motor, characterized in that the secondary conductor is made of a material of (2) The secondary conductor for a linear induction motor according to claim 1, wherein the high conductivity material has a circular longitudinal section.