JP2011239519A - Reaction plate of linear induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reaction plate that permits higher thrust and power factor than those of a conventional thick plate flat type reaction plate and assurance of reliability, robustness and productivity.SOLUTION: A reaction plate 102 of a linear induction motor is installed on a track on which a running vehicle travels as a secondary side conductor together with a primary side iron-core 101 on the running vehicle. The reaction plate 102 of the linear induction motor is comprised of a bonded material that bonds the top surface of an iron-system metallic base material 109 and the bottom surface of an electric conductive non-ferrous material 103. The top surface of the electric conductive non-ferrous material 103 is arranged so as to face the primary side iron-core 101, and multiple cuts 91 are grooved on the top surface of the iron-system metallic base material 109 at certain intervals.

Description

  The present invention relates to a reaction plate that is a secondary conductor of a linear induction motor used in transportation, and more particularly to a reaction plate of a linear induction motor that is composed of a composite conductor of a ferrous metal base material and a conductive nonferrous metal material. About.

  In general, linear induction motors used in transportation systems have a primary iron core on the vehicle body side of the transportation system, and a reaction plate that is a secondary conductor facing the primary iron core on the ground side. The primary winding is fed with a variable frequency variable voltage power source to generate a moving magnetic field to generate a thrust with the reaction plate. A reaction plate, which is a secondary conductor of a linear induction motor, includes a thick ferrous metal base material joined to a conductive non-ferrous metal material (see, for example, Patent Document 1).

  In addition, in order to suppress the generation of eddy currents and reduce magnetic saturation, a plurality of iron-based metals insulated from each other in a direction perpendicular to the traveling direction of the vehicle body of transportation is arranged to constitute an iron-based metal base material, There is a stacked reaction plate in which a cap-type conductive non-ferrous metal material is arranged on the upper part of this iron-based metal base material (see, for example, Patent Document 2).

JP 59-144362 A Japanese Examined Patent Publication No. 4-32631

  By the way, the linear induction motor generates a thrust that drives the vehicle body of the transportation system, but because of the structure between the primary side iron core and the secondary side reaction plate, a suction force larger than the thrust that does not contribute to the propulsion of the vehicle body is also present. appear. For this reason, the structure of the reaction plate must be a structure that is robust enough to withstand this electromagnetic force.

  In the case of the laminated reaction plate described above, the iron-based metal base material having a laminated structure is not directly fixed on the ground, but is placed on the reaction plate base, and a cap is formed so that the iron-based metal base material is accommodated in the recess. An electrically conductive nonferrous metal material is placed, and is fixed to the reaction plate frame by a conductive nonferrous metal fastening bolt. Therefore, there is a problem that the bonding strength between the ferrous metal base material and the cap-type conductive non-ferrous metal material is inferior to that of the thick plate type reaction plate that joins them with an explosive cladding.

  In addition, the structure is such that the reaction plate is screwed to the reaction plate base using conductive non-ferrous metal fastening bolts, increasing the number of screwing points, increasing the amount of work, and causing problems such as forgetting to tighten or loosening. Cheap. Furthermore, the cap-type conductive non-ferrous metal material has a slot portion for storing the conductive non-ferrous metal fastening bolts on both edges, and there is a problem that it is inferior in terms of productivity compared to the thick plate type reaction plate. is there. As described above, the laminated reaction plate is improved in thrust and power factor as compared with the thick plate reaction plate, but has problems in reliability, robustness, and productivity.

  The present invention has been made on the basis of the above-mentioned matters, and its purpose is to achieve an improvement in thrust and power factor related to a conventional thick plate type reaction plate, and also to ensure reliability, robustness and productivity. Is to provide a reaction plate.

  In order to achieve the above object, a first aspect of the present invention is a reaction plate for a linear induction motor installed on a track along which a traveling vehicle travels as a secondary conductor together with a primary iron core provided for the traveling vehicle. The reaction plate of the linear induction motor is composed of a bonding material obtained by bonding an upper surface of a ferrous metal base material and a lower surface of a conductive nonferrous metal material, and the upper surface of the conductive nonferrous metal material is opposed to the primary iron core. It is assumed that a plurality of cuts are provided at intervals on the upper surface of the iron-based metal base material.

  In a second aspect based on the first aspect, the plurality of cuts provided on the upper surface of the iron-based metal base material are in the same direction as the traveling direction of the traveling vehicle and in a direction perpendicular to the traveling direction. Each of them is provided continuously in parallel.

  Further, in a third invention according to the first or second invention, the plurality of cuts provided on the upper surface of the iron-based metal base material are near a central portion in a direction substantially perpendicular to the traveling direction of the traveling vehicle. It is characterized in that it is formed so as to be deepest and to become shallower toward the outer edge.

  Moreover, 4th invention is 1st or 2nd invention. WHEREIN: The some notch provided in the upper surface of the said iron-type metal preform | base_material vicinity of the center part of a substantially orthogonal direction with respect to the advancing direction of the said traveling vehicle In FIG. 2, the cut interval is formed so as to be the most dense, and the cut interval is decreased and becomes rougher toward the outer edge.

  Furthermore, a fifth invention is the first or second invention, wherein both ends of the conductive non-ferrous metal material in a direction substantially perpendicular to the traveling direction of the traveling vehicle are bent to the side opposite to the primary core side. It is formed.

  According to the present invention, the skin effect in the reaction plate is reduced, so that magnetic saturation can be relaxed and the thrust and power factor of the linear induction motor can be improved. In addition, since the conductive non-ferrous metal can be easily joined to the thick iron-based metal base material, a reaction plate that ensures reliability, robustness, and productivity can be provided.

It is a front view which shows the structure of the linear induction motor drive transportation provided with 1st Embodiment of the reaction plate of the linear induction motor of this invention. It is a side view which shows the flow of the magnetic flux in 1st Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the flow of the magnetic flux in 1st Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the reduction effect of the eddy current in 1st Embodiment of the reaction plate of the linear induction motor of this invention. It is a characteristic view which shows the relationship between the cutting depth and thrust in 1st Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the structure in 2nd Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the structure in 3rd Embodiment of the reaction plate of the linear induction motor of this invention. It is a schematic diagram which shows distribution of the magnetic flux density of the space | gap in 3rd Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the structure in 4th Embodiment of the reaction plate of the linear induction motor of this invention. It is a front view which shows the structure in 5th Embodiment of the reaction plate of the linear induction motor of this invention. It is a side view which shows the structure in 5th Embodiment of the reaction plate of the linear induction motor of this invention. It is a perspective view which shows the flow of the eddy current in 5th Embodiment of the reaction plate of the linear induction motor of this invention. It is a front view which shows the structure in 6th Embodiment of the reaction plate of the linear induction motor of this invention.

  Embodiments of a reaction plate for a linear induction motor according to the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the configuration of a linear induction motor-driven transportation system including the first embodiment of the reaction plate of the linear induction motor of the present invention.
In FIG. 1, 101 is mounted on a vehicle body (not shown) and a primary core of a linear induction motor that generates a moving magnetic field and magnetic flux by exciting a primary winding, and 102 is on the ground side facing the primary core of the linear induction motor. A thick plate type reaction plate laid on is shown.

  As shown in FIG. 1, the thick plate-type reaction plate 102 is perpendicular to the paper surface as a unit of an appropriate length in the center between train running rails 107 on which a linear induction motor train (not shown) runs. It extends in the direction (X-axis direction), and is fastened to the sleepers 108 by reaction plate fastening bolts 106. The thick plate flat reaction plate 102 is composed of a conductive non-ferrous metal material 103, an iron-based metal base material 109, and an iron-based metal base material (2) (frame) 105, which are the same as in the conventional example. For example, they are joined together by explosive cladding, caulking, welding or the like.

  The conductive non-ferrous metal material 103 is made of a metal having excellent conductivity such as copper or aluminum so as to promote the flow of eddy current. Further, as shown in FIG. 1, the conductive non-ferrous metal material 103 is installed on the uppermost part of the thick plate type reaction plate 102 so as to face the primary iron core 101 having the primary winding provided on the vehicle body with a gap. Has been.

  The iron-based metal base material 109 is composed of a thick plate-shaped iron-based ferromagnetic material, and the iron-based metal base material (2) (mounting base) is separated from the primary iron core 101 by the gap and the conductive non-ferrous metal material 103. Arranged at the top of 105. The surface to be joined to the conductive non-ferrous metal material 103 which is the upper surface of the iron-based metal base material 109 has a plurality of directions in the same direction as the linear induction motor train traveling direction (X-axis direction) and perpendicular to the traveling direction. The notches 91 are continuously formed in parallel with intervals.

  Next, the principle of thrust generation according to the first embodiment of the reaction plate of the linear induction motor of the present invention will be described with reference to FIGS. 2 is a side view showing the flow of magnetic flux in the first embodiment of the reaction plate of the linear induction motor of the present invention, and FIG. 3 is the magnetic flux in the first embodiment of the reaction plate of the linear induction motor of the present invention. FIG. 4 is a perspective view showing a flow, and FIG. 4 is a perspective view showing the effect of reducing eddy currents in the first embodiment of the reaction plate of the linear induction motor of the present invention. 2 to 4, the same reference numerals as those shown in FIG. 1 are the same or corresponding parts, and the description thereof is omitted.

  By supplying a variable frequency variable voltage power source to the primary winding of the primary core 101 of the linear induction motor, a moving magnetic field is generated in the primary core 101, and an alternating magnetic flux 115 is generated from the primary core 101. As shown in FIG. 2, the generated alternating magnetic flux 115 passes through the air gap and the conductive non-ferrous metal material 103 and flows through a magnetic circuit using the iron-based metal base material 109 as the secondary back yoke. In the iron-based metal base material 109, the alternating magnetic flux 115 enters the iron-based metal base material 109 and passes in the traveling direction (X-axis direction) of the linear induction motor train as shown in FIG. Return to 101. As a result, an eddy current is induced in the conductive non-ferrous metal material 103, and an electromagnetic force acting between the eddy current and the alternating magnetic flux 115 generates a thrust in the vehicle body of the transportation system on which the primary iron core 101 is mounted. In the present embodiment, the plurality of cuts 91 in the iron-based metal base material 109 are continuous in the same direction as the traveling direction (X-axis direction) of the linear induction motor train and parallel to the direction orthogonal to the traveling direction. Therefore, the plurality of cuts 91 do not hinder the flow of the magnetic flux 115.

Next, the relationship between the eddy current flowing through the iron-based metal base material 109 and the magnetic flux will be described with reference to FIG.
Most of the eddy current flowing through the thick plate type reaction plate 102 is generated by the conductive non-ferrous metal material 103 made of a metal having high conductivity, and the magnetic path through which the alternating magnetic flux 115 is passed is an iron-based metal matrix. The material 109 is configured. For this reason, when the eddy current 116 is generated in the iron-based metal base material 109 configured as a magnetic circuit instead of the conductive non-ferrous metal material 103, the alternating magnetic flux 115 is generated by the reaction of the eddy current 116, that is, the skin effect. It passes through the vicinity of the surface of the iron-based metal base material 109 without penetrating into the interior of 109. The skin depth δ can be expressed by the following mathematical formula 1.

Here, π represents the circular ratio, f represents the frequency of the eddy current, μ represents the magnetic permeability of the base material, and σ represents the electrical conductivity of the base material.
When the skin depth δ is reduced, the magnetic path cross-sectional area of the magnetic flux is reduced, and magnetic saturation is caused, resulting in deterioration of magnetic performance.

  In the present embodiment of the present invention, the flow of eddy current is suppressed by providing a plurality of cuts 91 in the iron-based metal base material 109. As shown in FIG. 4, by providing a plurality of cuts 91 in the iron-based metal base material 109, the flow path of eddy current in the direction orthogonal to the traveling direction (Z-axis direction) can be blocked. Thus, the loop of the large eddy current 116 generated in the above can be divided into small parts. As a result, the reaction magnetic field due to the eddy current can be reduced, so that the penetration of the magnetic flux into the iron-based metal base material 109 can be promoted.

  That is, by providing a plurality of notches 91 in the iron-based metal base material 109, the electrical conductivity σ of the base material expressed by the mathematical formula 1 can be reduced equivalently, the skin depth δ increases, and the skin effect Is reduced. As a result, when the magnetic path area of the magnetic flux is increased, the magnetic saturation is relaxed and the thrust is increased. Furthermore, magnetic flux leakage is reduced by the relaxation of magnetic saturation, and the power factor of the linear induction motor is improved.

FIG. 5 is a characteristic diagram showing the relationship between the depth of cut and the thrust in the first embodiment of the reaction plate of the linear induction motor of the present invention.
This characteristic diagram is obtained from the result of electromagnetic field analysis, and the vertical axis indicates thrust with the depth of the notch 91 provided in the iron-based metal base material 109 as the horizontal axis. In FIG. 5, δ is equal to the skin depth expressed by Equation 1. It can be seen from this characteristic diagram that, for example, in order to increase the thrust by 10% or more, it is necessary to provide a cut having a depth of about 2.7δ or more. For example, if the frequency of the eddy current is 3.5 Hz, the skin depth δ is calculated to be about 3.0 mm from Equation 1, and it is necessary to provide a cut of about 8 mm or more to increase the thrust by 10% or more. I understand.

  According to the first embodiment of the reaction plate of the linear induction motor of the present invention described above, the skin effect in the thick plate type reaction plate 102 is reduced, so that magnetic saturation is alleviated and the thrust and force of the linear induction motor are reduced. The rate can be improved. Further, since the conductive non-ferrous metal 103 and the thick iron-based metal base material 109 can be easily joined, it is possible to provide the thick plate-type reaction plate 102 that ensures reliability, robustness, and productivity. .

  FIG. 6 is a perspective view showing the structure of the reaction plate of the linear induction motor according to the second embodiment of the present invention. In FIG. 6, the same reference numerals as those shown in FIG. 1 to FIG. 5 are the same or corresponding parts, and the description of those parts is omitted.

  In this embodiment, a further cut 92 is provided in the iron-based metal base material 109 constituting the thick plate reaction plate 102. Specifically, the upper surface of the iron-based metal base material 109 provided in the first embodiment is in the same direction as the linear induction motor train traveling direction (X-axis direction) and parallel to the direction orthogonal to the traveling direction. In addition to a plurality of continuous cuts 91, intermittent cuts 92 are provided at portions intersecting with the cuts 91 in a direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction).

  By providing the two types of cuts 91 and 92 as described above, the generation of eddy current flowing in the iron-based metal base material 109 can be further suppressed as compared with the case of the first embodiment. That is, the notch 92 formed in a direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction) makes the flow of the eddy current 116 generated in the iron-based metal base material 109 shown in FIG. 4 more effective. As shown in FIG. 6, the loop of the eddy current 116 can be further reduced. For this reason, the skin effect in the iron-based metal base material 109 is remarkably reduced and the magnetic saturation is relaxed, so that the thrust of the linear induction motor increases. Further, since the leakage magnetic flux is reduced by relaxation of magnetic saturation, the power factor of the linear induction motor can be improved.

  According to the second embodiment of the reaction plate of the linear induction motor of the present invention described above, the same effects as those of the first embodiment described above can be obtained. Further, since the cut 92 in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction) is intermittently provided as in the present embodiment, the traveling direction of the linear induction motor train shown in FIG. The possibility that the notch 92 blocks the flow of the magnetic flux 115 passing in the (X-axis direction) can be minimized.

  FIG. 7 is a perspective view showing the structure of the reaction plate of the linear induction motor according to the third embodiment of the present invention. FIG. 8 is the magnetic flux density of the air gap according to the third embodiment of the reaction plate of the linear induction motor of the present invention. It is a schematic diagram which shows distribution. 7 and 8, the same reference numerals as those shown in FIGS. 1 to 6 are the same or corresponding parts, and the description thereof is omitted.

  In the present embodiment, the depths of the plurality of cuts 91 in the iron-based metal base material 109 constituting the thick plate flat reaction plate 102 are changed. Specifically, a cut 91 continuous in the traveling direction (X-axis direction) of the linear induction motor train on the upper surface of the iron-based metal base material 109 provided in the first embodiment is formed in the traveling direction of the linear induction motor train. On the other hand, it is formed deepest in the vicinity of the central portion in the substantially right-angle direction (Z-axis direction), and is formed so as to become shallower toward the outer edge.

  Incidentally, FIG. 8 schematically shows the magnetic flux density distribution in the gap between the primary iron core 101 and the reaction plate 102. In FIG. 8, the horizontal axis indicates the position in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction), and the vertical axis indicates the magnitude of the magnetic flux density. In FIG. 8, the characteristic indicated by the broken line is obtained by the configuration of the conventional reaction plate, and the characteristic indicated by the solid line is obtained by the configuration of the reaction plate of the present embodiment. In the structure of the conventional reaction plate indicated by the broken line, there is a phenomenon that the magnetic flux density is low near the center in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction) and high near both edges. It was seen. This non-uniformity of magnetic flux density is called an edge effect and is known to adversely affect the characteristics of a linear induction motor. In particular, due to the edge effect, the suction force acting between the primary iron core 101 and the reaction plate 102 increases, so it is necessary to consider this increase in suction force to ensure the reliability and robustness of the reaction plate. It was necessary.

  In the present embodiment, the notch 91 is formed deepest in the vicinity of the central portion in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction), and is formed so as to become shallower toward the outer edge. The nonuniformity of the magnetic flux density distribution in the gap between the iron core 101 and the reaction plate 102 can be reduced.

  According to the third embodiment of the reaction plate of the linear induction motor of the present invention described above, the same effects as those of the first embodiment described above can be obtained. Further, in the present embodiment, the iron-based metal base material 109 is made deeper by making the notch 91 provided near the center of the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction) into the iron-based metal base material 109. The penetration depth of the magnetic flux near the center of the metal base material 109 in the Z-axis direction can be increased. Thereby, the magnetic saturation near the center of the iron-based metal base material 109 in the Z-axis direction is relaxed, the magnetic flux density near the center is increased, and the non-uniformity of the magnetic flux density in the air gap can be mitigated. As a result, the edge effect is reduced, the suction force acting between the primary iron core 101 and the reaction plate 102 is reduced, and the reliability and robustness of the reaction plate are increased.

  FIG. 9 is a perspective view showing the structure in the fourth embodiment of the reaction plate of the linear induction motor of the present invention. In FIG. 9, the same reference numerals as those shown in FIGS. 1 to 8 are the same or corresponding parts, and the description thereof is omitted.

  In this embodiment, the gap in the Z-axis direction (substantially perpendicular to the traveling direction of the linear induction motor train) of the plurality of notches 91 in the iron-based metal base material 109 constituting the thick plate-type reaction plate 102 is changed. It is provided. Specifically, a notch 91 continuous in the traveling direction (X-axis direction) of the linear induction motor train on the upper surface of the iron-based metal base material 109 provided in the first embodiment is located near the center in the Z-axis direction. The notch intervals are formed so as to be the most dense, and the notch intervals are decreased and become rougher toward the outer edge.

  According to the fourth embodiment of the reaction plate of the linear induction motor of the present invention described above, the same effects as those of the third embodiment described above can be obtained. That is, the distance between the notches 91 provided near the center in the direction substantially perpendicular to the direction of travel of the linear induction motor train in the iron-based metal base material 109 (Z-axis direction) is formed to be the most dense near the center. By doing so, the penetration depth of the magnetic flux near the center of the iron-based metal base material 109 in the Z-axis direction can be increased. Thereby, the magnetic saturation near the center of the iron-based metal base material 109 in the Z-axis direction is relaxed, the magnetic flux density near the center is increased, and the non-uniformity of the magnetic flux density in the air gap can be mitigated. As a result, the edge effect is reduced, the suction force acting between the primary iron core 101 and the reaction plate 102 is reduced, and the reliability and robustness of the reaction plate are increased.

  FIG. 10 is a front view showing the structure of the reaction plate of the linear induction motor according to the fifth embodiment of the present invention. FIG. 11 is a side view showing the structure of the reaction plate of the linear induction motor according to the fifth embodiment of the present invention. FIG. 12 and FIG. 12 are perspective views showing the flow of eddy currents in the fifth embodiment of the reaction plate of the linear induction motor of the present invention. 10 to 12, the same reference numerals as those shown in FIGS. 1 to 9 are the same or corresponding parts, and the description thereof is omitted.

  In this embodiment, as shown in FIGS. 10 and 11, the reaction plate 102 extends in the traveling direction (X-axis direction) of the linear induction motor train, and is made of a conductive non-ferrous metal material 113 and an iron-based material. The metal base material 109 and the connecting member 4 are configured. Fastened to a track or the like (not shown) by fastening the lower part of the connecting member 4 with a reaction plate fastening bolt 106.

  As shown in FIGS. 10 and 11, the connecting member 4 has a hollow rectangular structure of ferrous metal, has a rectangular cross section, and has a conductive non-ferrous metal material 113 and an ferrous metal base material 109 on the upper surface. Is installed.

  The conductive non-ferrous metal material 113 is made of a metal having excellent conductivity such as copper or aluminum so as to promote the flow of eddy current, and as shown in FIG. It is installed on the uppermost part of the reaction plate 102 so as to face the primary iron core 101 having a wire with a gap. The conductive non-ferrous metal material 113 includes a convex portion 1130 formed so as to project in a convex shape toward the primary iron core 101 facing in the vicinity of the center in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction). In the vicinity of both edges, a bent portion 1131 formed by bending the iron-based metal base material 109 on the opposite side to the primary iron core 101 side, and an outer end side of the bent portion 1131 on the upper surface of the connecting member 4 And a bent portion 1132 formed by being bent along. The conductive non-ferrous metal material 113 is fastened to the connecting member 4 by a conductive non-ferrous metal fastening bolt 114 at the bent portion 1132.

  The iron-based metal base material 109 is made of an iron-based ferromagnetic material having a flat plate shape, and is disposed above the connecting member 4 with a gap and a conductive non-ferrous metal material 113 separated from the primary iron core 101. A plurality of cuts 91 are formed in the traveling direction (X-axis direction) of the linear induction motor train on the surface joining the conductive non-ferrous metal material 113 which is the upper surface of the ferrous metal base material 109.

  FIG. 12 simply shows the path of the eddy current 116 flowing through the conductive non-ferrous metal material 113 in the present embodiment. As described in the third embodiment, the phenomenon called the edge effect in which non-uniformity of the magnetic flux density in the gap between the primary iron core 101 and the reaction plate 102 appears adversely affects the characteristics of the linear induction motor. One factor that increases the edge effect is a traveling direction (X-axis direction) component of the eddy current 116. In other words, the edge effect increases when the component in the traveling direction (X-axis direction) of the eddy current 116 passes through a position close to the gap between the primary iron core 101 and the reaction plate 102.

  By forming the conductive nonferrous metal material 113 as in the present embodiment, the traveling direction (X-axis direction) component of the eddy current 116 concentrates on the bent portions 1131 and 1132 of the conductive nonferrous metal material 113. A component of the traveling direction (X-axis direction) of the eddy current 116 appears at a position away from the gap between the primary iron core 101 and the reaction plate 102. As a result, the influence of the traveling direction (X-axis direction) component of the eddy current 116 on the magnetic flux density of the air gap is reduced, and the edge effect is reduced.

  According to the fifth embodiment of the reaction plate of the linear induction motor of the present invention described above, the same effects as those of the first embodiment described above can be obtained. In addition, since the edge effect can be reduced, the characteristics of the linear induction motor can be improved. Further, unlike the prior art of Patent Document 2, since the ferrous metal base material 109 is integrally formed, the ferrous metal base material 109 can be formed by a relatively simple method of fastening the conductive non-ferrous metal material 113 and the connecting member 4. Can be fixed, and productivity can be improved.

  FIG. 13: is a front view which shows the structure in 6th Embodiment of the reaction plate of the linear induction motor of this invention. In FIG. 13, the same reference numerals as those shown in FIGS. 1 to 12 are the same or corresponding parts, and the description of those parts is omitted.

  In the present embodiment, as shown in FIG. 13, the thick plate flat reaction plate 102 is extended in the traveling direction (X-axis direction) of the linear induction motor train, and the conductive non-ferrous metal material 113 and the ferrous metal The metal base material 109 and the iron-based metal base material (2) (mounting base) 105 are configured to be joined to each other by, for example, explosive cladding, caulking, welding, or the like, as in the conventional example.

  The conductive non-ferrous metal material 113 is composed of a metal having excellent conductivity such as copper or aluminum so as to promote the flow of eddy current, and as shown in FIG. 13, the primary winding provided on the vehicle body. It is installed on the uppermost part of the reaction plate 102 so as to face the primary iron core 101 having a wire with a gap. The conductive non-ferrous metal material 113 includes a convex portion 1130 formed so as to project in a convex shape toward the primary iron core 101 facing in the vicinity of the center in the direction substantially perpendicular to the traveling direction of the linear induction motor train (Z-axis direction). In the vicinity of both edges, a bent portion 1131 formed by being bent by the height of the iron-based metal base material 109 is provided on the opposite side to the primary iron core 101 side.

  The iron-based metal base material 109 is composed of a thick plate-shaped iron-based ferromagnetic material, and the iron-based metal base material (2) (stand) is separated from the primary iron core 101 by a gap and a conductive non-ferrous metal material 113. Arranged at the top of 105. A plurality of cuts 91 are formed in the traveling direction (X-axis direction) of the linear induction motor train on the surface joining the conductive non-ferrous metal material 113 which is the upper surface of the ferrous metal base material 109.

  According to the sixth embodiment of the reaction plate of the linear induction motor of the present invention described above, the same effects as those of the first embodiment described above can be obtained. Further, by providing the conductive non-ferrous metal material 113 with the bent portion 1131, the edge effect can be reduced as in the fifth embodiment. Moreover, since the joining of the conductive non-ferrous metal material 113 and the iron-based metal base material 109 is more robust than that of the prior art of Patent Document 2, reliability and robustness are improved.

101 Primary iron core 102 Reaction plate 103 Conductive non-ferrous metal material 106 Reaction plate fastening bolt 107 Train running rail 108 Sleeper 109 Iron-based metal base material 91 Notch 92 Notch

Claims (5)

In the reaction plate of the linear induction motor installed on the track along which the traveling vehicle travels as a secondary conductor together with the primary side iron core provided to the traveling vehicle,
The reaction plate of the linear induction motor is composed of a bonding material obtained by bonding the upper surface of the ferrous metal base material and the lower surface of the conductive non-ferrous metal material,
The upper surface of the conductive nonferrous metal material is disposed so as to face the primary side iron core,
A reaction plate for a linear induction motor, wherein a plurality of cuts are provided at intervals on an upper surface of the iron-based metal base material. In the reaction plate of the linear induction motor according to claim 1,
The plurality of cuts provided on the upper surface of the iron-based metal base material are provided in the same direction as the traveling direction of the traveling vehicle and continuously provided in parallel to the direction orthogonal to the traveling direction. Reaction plate for linear induction motor. In the reaction plate of the linear induction motor according to claim 1 or 2,
The plurality of cuts provided on the upper surface of the iron-based metal base material are formed deepest in the vicinity of the center in a direction substantially perpendicular to the traveling direction of the traveling vehicle, and are formed so as to become shallower toward the outer edge. A reaction plate for linear induction motors. In the reaction plate of the linear induction motor according to claim 1 or 2,
The plurality of cuts provided on the upper surface of the iron-based metal base material are formed so as to have the largest cut intervals near the center in the direction substantially perpendicular to the traveling direction of the traveling vehicle. A reaction plate for a linear induction motor, characterized by being formed so that the interval between the cuts becomes smaller and rougher as it goes. In the reaction plate of the linear induction motor according to claim 1 or 2,
A reaction plate for a linear induction motor, wherein both end portions of the conductive non-ferrous metal material that are substantially perpendicular to the traveling direction of the traveling vehicle are bent to the opposite side of the primary iron core.

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