JPH08196004A - Noncontact power supply device - Google Patents

Abstract

PURPOSE: To obtain power necessary for loading without increasing the size of a power supply unit by strengthening magnetic coupling of a power supply line and a secondary core by shortening or lengthening the distance between a rail member and a core by driving a magnetic coupling variable mechanism in the case of lifting a luggage. CONSTITUTION: When a moving body 20 arrives at the elevating ground point of a luggage carrier, a motor driver 31 sets the output of the driving voltage to a traveling motor 28 to off to stop the body 20, and sets the output of the driving voltage to the moving motor 35 of a magnetic coupling variable mechanism to on. The distance l between an E-shaped core 21 and a rail member 11 is reduced from a normal gap length g0 to a predetermined gap length, and parallel power supply lines 12a, 12b are magnetically deeply coupled to the secondary coil 22 to set the output of the driving voltage to an elevation motor to on, and the elevating operation of the carrier is conducted by the body 20. Thus, the sufficient power to drive the motor can be obtained without enlarging the apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact power supply device, and more particularly, to a transportation system for automatically transporting luggage in a premises such as a warehouse, which is installed along the transportation route of the luggage in the premises. The present invention relates to a non-contact power feeding device for non-contactly supplying necessary power from a power feeding unit to a moving body that actually carries a package.

[0002]

2. Description of the Related Art Generally, in a yard such as a warehouse, a carrying system for automatically carrying a load without a human hand has a rail-like power supply unit installed along the load carrying route and a power supply unit for this power supply. It is composed of a moving body that actually carries luggage while receiving power from the unit steadily, but the power supply from the power feeding unit to the moving body is usually in a non-contact form (contactless power feeding). ).
This is because, if power is supplied from the power supply unit to the moving body by mechanically contacting them (contact power supply), the power supply unit (including the power collection unit) that actually transfers the power moves. As the body travels, it is rubbed and the mobility of the moving body deteriorates. In addition, the friction causes wear of the power supply part, which results in sufficient durability and reliability of the power supply part. This is because such inconvenience as not being possible occurs.

For this reason, in this type of transfer system, a non-contact power feeding device is used as a special mechanism for non-contactly supplying power to the moving body from the power feeding unit. Hereinafter, the principle configuration of a non-contact power supply device applied to a conventional transfer system will be described with reference to the drawings.

FIG. 3 is a principle block diagram of a non-contact power supply device applied to a conventional transfer system. As shown in the figure, first, this conventional non-contact power feeding device is equipped on a rail member 11 which configures the power feeding unit 1 itself of the transport system, and parallel power feeding lines 12a and 12b, and on the side of the moving body 2. The E-shaped core 21, the secondary coil 22, and the motor drive circuit 23 are mainly configured.

Of these, the rail member 11 constituting the power feeding unit 1 itself is made of a paramagnetic material such as aluminum and has a U-shaped cross section. In addition, the parallel feed lines 12a and 12b are supported by line support members 13a and 13b, both of which are made of an insulating material such as synthetic resin, so that the parallel feed lines 12a and 12b are isolated from the inner wall of the side of the rail member 11, respectively. It is continuously installed along the longitudinal direction of the member 11 (direction perpendicular to the drawing). Then, the power feeding unit 1 configured as described above
When constructing an actual transport system, is installed on the floor surface of a premises such as a warehouse using a predetermined fixture (not shown) along the transportation route of the luggage. The high frequency current supplied from (not shown)
The parallel feed lines 12a and 12b are energized.

On the other hand, the E-shaped core 21 provided on the side of the moving body 2 is made of a ferrimagnetic material such as ferrite, and the parallel feed line 12 is formed between the facing edges.
The core holders 24, so that a and 12b are respectively located.
It is fixed to a part of a structural member 27 forming a casing of the moving body 2 through a fixed shaft 25 and a shaft holder 26. Further, the secondary coil 22 is wound around the protruding side located at the center of the protruding sides of the E-shaped core 21,
Two magnetic fluxes generated around the respective parallel feed lines 12a and 12b according to the right-handed screw law in accordance with the high-frequency currents applied to the parallel feed lines 12a and 12b generate the above-mentioned rail members 11 and E.
The inside of the secondary coil 22 is penetrated in the same direction while using the mold core 21 as a magnetic path (the arrow indicates the direction of the magnetic flux at a certain time in the figure). From the above principle, the parallel feed lines 12a and 12b and the secondary coil 22 are
A magnetic coupling is obtained between the secondary coil 22 and the secondary coil 22, and a predetermined induced electromotive force is steadily induced in the secondary coil 22. Therefore, various voltages required to drive various motors mounted on the moving body 2 are generated, and the supply of the various generated voltages to the various motors is temporally controlled.

Here, in addition to the above configuration of the motor drive circuit 23, for example, when various motors equipped in the moving body 2 are only AC motors, an inverter circuit for obtaining a required AC voltage is provided. When a DC motor is included therein (not shown), a rectifier circuit (not shown) for obtaining a required DC voltage from the AC voltage of the secondary coil 22 is also included. A microprocessor and a memory (both not shown) for turning on / off various motor driving voltages (hereinafter referred to as motor driving voltages) obtained by the circuit by program control are incorporated. The output of the above-mentioned motor drive voltage is obtained by at least the traveling motor 28 (either AC or DC) for obtaining the power for traveling the moving body 2 (moving the luggage in the horizontal direction). It is connected to a lifting motor (either AC or DC; not shown) for obtaining power for moving a cargo bed (not shown) mounted on the moving body 2 up and down (moving luggage vertically). Of these, the power obtained when the traveling motor 28 is driven is transmitted through the rotary shaft 29 to the rail member 1 described above.
It is adapted to be transmitted to the traveling tire 30 which contacts the upper side of the first tire 1. Then, based on the above configuration, the moving body 2 is allowed to travel along the luggage transport route while maintaining a predetermined correlation with the power feeding unit 1.

The predetermined correlation between the power feeding unit 1 and the moving body 2 is mainly the distance relationship between the two, which is the most important factor in constructing this contactless power feeding device. I mean. That is, as described above, the non-contact power feeding device is used for the purpose of avoiding the inconvenience caused by the contact power feeding (the inconvenience caused by the friction and wear of the power feeding portion), and thus the E of the rail member 11 of the power feeding unit 1 and the moving body 2 is used. In order to prevent the die core 21 from coming into contact with the moving body 2 during traveling, as shown in the figure, a corresponding portion is provided between the inner wall of the side of the rail member 11 and the tip of the protruding side of the E-shaped core 21. Distance l
It is necessary to ensure that (the distance 1 when the moving body 2 is stopped is the gap length g (l = g)).
Therefore, in an actual transport system, a distance holding mechanism (for example, a guide rail or the like, not shown) for keeping the distance relationship between the power feeding unit 1 and the moving body 2 in a predetermined state is usually provided. .

However, in the actual transportation system, the transportation route of the cargo is rarely completed only on the straight road, and there are some curved roads on the transportation route, and the moving body 2 travels on the curved road on the curved road. At times, the inner wall of the side of the rail member 11 and the tip of the protruding side of the E-shaped core 21 are considerably close to each other.
It is necessary to select a relatively large gap length g at the stage of system design so that a necessary and sufficient distance 1 can be ensured even when the vehicle runs on the curved line. However, if the gap length g is increased unnecessarily in accordance with this, the distance 1 when the moving body 2 travels in a straight line (substantially equivalent to the distance 1 when the moving body 2 is stopped) becomes too large. This is because the magnetic coupling between the parallel feed lines 12a and 12b and the secondary coil 22 becomes extremely weak, which may significantly reduce the induced electromotive force induced in the secondary coil 22. Careful attention must be paid to (actually, the best point can be found experimentally).

[0010]

By the way, the power supplied from the power feeding unit 1 to the motor drive circuit 23 of the moving body 2 (induced electromotive force induced in the secondary coil 22) is naturally large. The portion is used to drive the traveling motor 28 and the lifting motor that are involved in the transportation of luggage. And, as these motors, of course, those having a large power are used so that they can sufficiently withstand the transportation of heavy loads. In particular, since the lifting motor is an important power source for raising and lowering the load carrying load against gravity, it is necessary to use a motor with a particularly large power. The maximum value of the electric power that is sometimes consumed is significantly larger than that of the traveling motor 28 that is a power source for simply traveling the moving body 2.

Here, considering the situation in which the lifting motor, which consumes a large amount of power, is actually driven, it is assumed that, when the moving body 2 is running, the loading platform with a load is raised and lowered. If so, there is a risk that the luggage may fall off the luggage bed due to the inertia during traveling, so that the traveling motor 28 is not actually driven when the lifting motor is driven. In other words, the motor drive circuit 23 drives the lifting motor only when the traveling motor 28 is not driven (when the moving body 2 is stopped), and drives both motors. Are not done at the same time. Therefore, for the motor drive circuit 23,
As long as the electric power exceeding the maximum value of the electric power consumed by the lifting motor alone is supplied, all of the various motors equipped in the moving body 2 can operate stably.

However, as described above, the maximum value of the electric power consumed by the lifting motor is remarkably large. Therefore, in order to obtain the actually required electric power, the rail member 11 and the E-shaped core 21 are used. It is necessary to reduce the magnetic reluctance of the magnetic path as much as possible, and in order to do this, the E-shaped core 21 must be fairly large. Then, it is necessary to use the rail member 11 corresponding to the size of the E-shaped core 21. As a result, not only the size of this non-contact power feeding device is increased, but also the power feeding unit 1 and the moving body 2 are used. At the same time, it also mimics the increase in size. This results in considerable obstacles in constructing the required transport system.

The present invention has been made on the basis of such an actual situation, and an object thereof is structurally capable of surely obtaining an electric power necessary and sufficient for driving a lifting motor.
It is to provide a small contactless power supply device.

[0014]

The present invention provides at least the following:
A rail member made of paramagnetic material, and so as to be respectively supported in a state of being separated from the inner wall of the side of the rail member,
A parallel feeding line that is continuously installed along the longitudinal direction of the rail member is provided on the side of the feeding unit, and the parallel feeding line is held so that the parallel feeding lines are respectively located between the facing sides. E made of magnetic material
A mold core, a secondary coil wound around a protrusion located at the center of the E-shaped core, and a lifting motor for obtaining power for lifting the loading platform are provided on the moving body side. A magnetic coupling applied to a contact power supply device, which varies the distance between the inner wall of the side of the rail member and the tip of the protruding side of the E-shaped core to magnetically deeply couple the parallel power supply line and the secondary coil. The output of the motor drive voltage for driving the lifting motor is turned on only when the variable mechanism and the magnetically coupled variable mechanism provide a magnetically deeply coupled state of the parallel feed line and the secondary coil. And a motor drive circuit set to.

[0015]

According to the present invention, the moving body travels based on the electric power induced in the secondary core by the magnetic coupling between the feed line and the secondary core. And the moving body works by the cargo handling means,
For example, when lifting and lowering luggage, the magnetic coupling variable mechanism is driven by the drive control means, and the distance between the rail member and the core is shortened or lengthened to magnetically couple the power feeding line and the secondary core. Strengthen. At this time, the electric power that the moving body obtains from the power feeding unit is larger than that before the distance between the rail member and the core is changed. Therefore, the electric power required for the work by the cargo handling means can be secured by changing the distance between the rail member and the core. Therefore, it is not necessary to increase the size of the power feeding unit or the like for the electric power required for the work by the cargo handling means.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Since the structure of the present invention is basically the same as that of the conventional one, the drawings for explaining the present embodiment relate to members having the same structure as the members shown in the conventional drawings, and correspond to it. The same reference numerals are used. Further, the present invention aims to provide a smaller one than the conventional one, but in the present embodiment, for convenience, it is premised that the dimensions of the members constituting the present invention are the same as those of the conventional one. And explain.

FIG. 1 is a principle configuration diagram of a non-contact power feeding device according to an embodiment of the present invention. As shown in the figure, the contactless power feeding device of this embodiment is similar to the conventional one, and the rail member 11, which constitutes the power feeding unit 1 itself of the transport system,
And the parallel feed lines 12a and 12b, and the E-shaped core 2 mounted on the side of the moving body 20 (different from the conventional moving body 2).
1, a secondary coil 22, a motor drive circuit 31 (different from the conventional motor drive circuit 23), and a magnetic coupling variable mechanism (details will be described later) composed of a plurality of members.

Of these, the power feeding unit 1 is the same as the conventional ones with respect to all the members constituting the power feeding unit 1, and the entire power feeding unit 1 constitutes a part of the configuration for realizing the contactless power feeding device. are doing.

That is, the rail member 11 made of paramagnetic material such as aluminum has a U-shaped cross section, and the parallel feed lines 12a and 12b are both made of an insulating material such as synthetic resin. The support members 13a and 13b are continuously laid along the longitudinal direction of the rail member 11 so as to be supported in a state of being separated from the inner wall of the side of the rail member 11, respectively. Then, the power feeding unit 1 having the above-described configuration uses a predetermined fixing tool on the floor surface of the premises such as a warehouse along the transportation route of the luggage when constructing an actual transportation system, just as in the conventional case. In this state, the high frequency current supplied from the predetermined power supply device is applied to the parallel feed lines 12a and 12b.
Is designed to be energized.

On the other hand, in order to realize this non-contact power supply device, the member mounted on the moving body 20 side is the E-shaped core 21.
The secondary coil 22 and the secondary coil 22 are exactly the same as the conventional ones, but the motor drive circuit 31 has some functions added to the conventional one, and further the conventional fixed shaft 25 and its peripheral members. Instead, a magnetic coupling variable mechanism is newly provided.

That is, the E-shaped core 21 made of a ferrimagnetic material such as ferrite is provided with a core holder 24 and a slide holder so that the parallel feed lines 12a and 12b are respectively located between the opposing projecting sides. Through the shaft (eg, ball screw) 32, the structural member 33
It is held by a gear box (e.g., worm gear) 34 installed inside (unlike the conventional structural member 27). The gear box 34 has a shaft (denoted by a reference numeral) of a moving motor 35 for obtaining power for moving the E-shaped core 21 in the depth direction of the rail member 11 (left-right direction in the drawing). Suzu) is connected. In other words, the above slide shaft 3
2, the distance between the inner wall of the side of the rail member 11 and the tip of the protruding side of the E-shaped core 21 (details will be described later) is provided to the non-contact power feeding device by the gear box 34 and the moving motor 35. A magnetic coupling variable mechanism for varying is configured.
Further, the secondary coil 22 is one of the projecting sides of the E-shaped core 21.
It is wound around the protrusion located at the center thereof, and according to the above-mentioned principle, a predetermined induced electromotive force is constantly induced according to the high-frequency current supplied to the parallel feed lines 12a and 12b. Further, the motor drive circuit 31 generates from the induced electromotive force various motor drive voltages necessary for driving various motors mounted on the moving body 20, and outputs the generated various motor drive voltages to various motors. Is controlled in time.

Here, the outputs of various motor drive voltages generated by the motor drive circuit 31 are at least the traveling motor 28 for obtaining the power for traveling the moving body 20, as in the conventional case. It is connected to an elevating motor to obtain power for raising and lowering a loading platform mounted on the moving body 20, and is also connected to the moving motor 35 described above, and is obtained when the traveling motor 28 is driven. The power is transmitted to the running tire 30 that contacts the upper side of the rail member 11 through the rotating shaft 29 as in the conventional case. In order to obtain these various motor drive voltages, the motor drive circuit 31 has an inverter circuit, a rectifier circuit, a microprocessor, a memory, etc. built therein as in the conventional case. In the drive circuit 31, the parallel feed lines 12a and 12b and the secondary coil 22 are magnetically deep by the magnetic coupling variable mechanism including the slide shaft 32, the gear box 34, and the moving motor 35 described above. It functions to set the output of the motor drive voltage for driving the lifting motor to the ON state only when the combined state is obtained.

That is, the function of the motor drive circuit 31 described above will be described based on the relationship with the magnetic coupling variable mechanism. First, in the actual transport system, as described above,
In order to avoid contact between the inner wall of the side of the rail member 11 and the tip of the projecting side of the E-shaped core 21 when the moving body 20 travels in a curved line, as shown in the figure, a suitable gap is provided between the two. It is necessary to secure the distance l (the distance l when the moving body 20 is stopped is the steady gap length g _o (l = g _o )), but it is possible to make the distance l smaller than the present condition. If possible (if the above-mentioned magnetic path can be shortened), the magnetic coupling between the parallel feed lines 12a and 12b and the secondary coil 22 will deepen, and the induced electromotive force induced in the secondary coil 22 will increase. As a result, the motor drive circuit 31 should be supplied with electric power capable of driving the lifting motor, which consumes a large amount of power, with a margin. On the other hand, the motor drive circuit 31 drives the lifting motor when the loading platform is lifted only when the traveling body 28 is stopped without driving the traveling motor 28, as described above. And the loading platform is raised and lowered
Since it is usually on the straight road of the luggage transportation route, under this circumstance, the distance l is set to such an extent that the inner wall of the side of the rail member 11 and the tip of the protruding side of the E-shaped core 21 do not come into contact with each other. It can be reduced. Therefore, in this non-contact power feeding device, in order to obtain enough power to drive the lifting motor that consumes a large amount of power, the magnetic coupling variable mechanism and the motor drive circuit 31 are not used to increase the size of the device itself.
By using the functions of and, under the above situation,
Optionally, the parallel feed lines 12a and 12b and the secondary coil 22.
Is to deepen the magnetic coupling with.

Specifically, the motor drive circuit 31 performs program control by using a built-in microprocessor (and memory), so that, for example, first, the moving body 20 traveling on the luggage transportation route is When reaching the ascending / descending point of the loading platform, the output of the motor drive voltage for driving the traveling motor 28 is set to the off state, and then, when the moving body 20 stops according to this setting, the moving motor 35 is driven. the output of the motor driving voltage according to the forward rotation drive (drive to approximate E-type core 21 in the rail member 11) is set to oN state, the distance l predetermined gap length from the steady gap length g _o (the symbol with the (The output of the motor drive voltage at the completion is off). When the parallel feed lines 12a and 12b and the secondary coil 22 are magnetically deeply coupled to each other, the motor drive circuit 31 finally outputs the motor drive voltage for driving the lifting motor. Set to the ON state to cause the moving body 20 to perform a series of operations for actually lifting and lowering the loading platform, and further set the output of the motor drive voltage to the OFF state with the completion of the series of lifting and lowering operations. After that, the output of the motor drive voltage related to the reverse drive of the moving motor 35 (the drive for moving the E-shaped core 21 away from the rail member 11) is set to the ON state, and the distance 1 is set to the above-described predetermined gap length. it return to the steady gap length g _o (output oFF state upon completion of the motor driving voltage).

That is, in this non-contact power feeding device,
When the moving body 20 is stopped during the lifting and lowering of the loading platform,
By making the magnetic coupling variable mechanism including the slide shaft 32, the gear box 34, and the moving motor 35 function, the inner wall of the side of the rail member 11 and the E-shaped core 21.
The distance l between the tip of the projecting side, thereby reducing the steady-gap length g _o a predetermined gap length, parallel feed line 12
a, 12b and the secondary coil 22 are magnetically deeply coupled to each other, and when this state is obtained, the motor drive circuit 31 is caused to function to drive the lifting motor. By setting the voltage output to the ON state for the first time, sufficient power for driving the above-described lifting motor can be obtained without increasing the size of the device itself. As a result of the above, according to this non-contact power supply device, the dimensions of the individual parts such as the rail member 11 and the E-shaped core 21 constituting the same are the same as those of the conventional one.
Therefore, while the overall size is exactly the same as that of the conventional one, it becomes possible to obtain a larger amount of electric power than necessary when necessary, so that the maximum value of the electric power to be obtained here becomes the same level as that of the conventional one. By designing various dimensions, the miniaturization of the device itself, which is the object of the present invention, can be relatively achieved.

Next, the electrical characteristics of the contactless power feeding device having the above configuration will be considered based on the data obtained in the experiment. Note that the consideration made here is a consideration as to how the electric power that can be actually taken out from the secondary coil 22 changes in accordance with the variation of the distance l described above.

2 (a) and 2 (b) are diagrams showing the electrical characteristics of the non-contact power feeding device according to one embodiment of the present invention. However, FIG. 7A is a diagram showing how the voltage changes with respect to the current for three representative values of the distance l,
FIG. 7B is a diagram showing how the power changes when the distance 1 is continuously changed.

First, as shown in FIG. 6 (a), when the distance l is constant gap length g _o is would be significant voltage drop occurs with increasing current, to drive the large elevator motor power consumption It is understood that is not suitable. However, the distance l is reduced, and the steady gap length g
_It can be understood that if the negative side gap length g ₋ (experimental value) is set from _{o, the} voltage drop hardly occurs even if the current increases, and the lifting motor can be driven with a margin, as expected. Also, attempts, the distance l is larger, even if this was the constant gap length g _o positive gap length g ₊ a (experimental value), contrary to expectations, it does not occur so much voltage drop, in this situation Also, it is understood that the lifting motor can be driven sufficiently.

[0029] That is, as shown in FIG. (B), the distance l which increases power which can be extracted from the secondary coil 22, instead of only being present shorter point than the steady gap length g _o Surprisingly, it also exists at a point longer than that, and this phenomenon occurs because the magnetic flux passing through the rail member 11 and the E-shaped core 21 (see FIG. 3) increases the distance l. As a result, the rail member 11 becomes harder to pass, and the ends of the protruding sides of the E-shaped core 21 directly pass through each other, and the magnetic resistance of the magnetic path at this time becomes lower than that of the original magnetic path. It is thought that this is because points are generated. From this curve, it is understood that the power is reduced even if the distance 1 is reduced too much. This is because the eddy current loss in the rail member 11 extremely increases as the distance 1 is reduced. This is because

Therefore, in the operation of this non-contact power feeding device, as described above, the magnetic coupling between the parallel power feeding lines 12a and 12b and the secondary coil 22 is deepened by reducing the distance l. Instead, it can be expanded and deepened. Therefore, in this non-contact power feeding device, when the structured, negative gap length g of the above _- and as well as selected to minimize the gap length g _min (applicable value) available power reaches a peak in its vicinity, the positive side Similarly, the gap length g ₊ is selected to be the maximum gap length g _max (applicable value) at which the power that can be supplied is peaked around the gap length, and further, the gap length g ₊ is set as the “runout width” of the E-shaped core 22. By designing the mechanism (including program design), the magnetic coupling between the parallel feed lines 12a and 12b and the secondary coil 22 can be changed arbitrarily. Of course, this set of "amplitude" only needs include a point either to supply electric power reaches a peak, for example, the constant gap length it g _o and the minimum gap length g _min
Between (and the direction to reduce the distance l),
On the contrary, it is also possible to limit only between the steady gap length g _o and the maximum gap length g _max (direction in which the distance 1 is increased).

[0031]

As described above, according to the present invention, when the moving body is stopped when the loading platform is raised and lowered,
By operating the variable magnetic coupling mechanism, the distance between the inner wall of the side of the rail member and the tip of the protruding side of the E-shaped core is varied to magnetically deeply couple the parallel feed line and the secondary coil. In addition, when this state is obtained, the motor drive circuit is made to function, and the output of the motor drive voltage for driving the lifting motor is set to the ON state for the first time. Without increasing the size of the device itself
Electric power sufficient to drive the lifting motor can be obtained. As a result of the above, according to the present invention, the dimensions of the individual parts such as the rail member and the E-shaped core, which are included in the present invention, are the same as those of the conventional one, and therefore the overall size thereof is exactly the same as that of the conventional one. However, it becomes possible to obtain more power than before when needed,
If the dimensional design is performed so that the maximum value of the electric power to be obtained here will be at the same level as that of the conventional one, relatively,
The miniaturization of the device itself, which is the object of the present invention, is achieved.

Although the E-type core has been described in the above embodiment, it is needless to say that the E-type core may be a C-type core.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of a contactless power supply device according to an embodiment of the present invention.

FIG. 2 is a diagram showing electrical characteristics of a non-contact power feeding device according to an embodiment of the present invention.

FIG. 3 is a principle configuration diagram of a non-contact power supply device applied to a conventional transport system.

[Explanation of symbols]

 1 Feeding Unit 11 Rail Members 12a, 12b Parallel Feeding Line 20 Moving Body 21 E-Type Core 22 Secondary Coil 31 Motor Drive Circuit 32 Slide Shaft 34 Gear Box 35 Moving Motor

Claims (3)

[Claims] 1. A power feeding unit having a rail member made of a non-magnetic material, and a power feeding line continuously installed along a longitudinal direction of the rail member so as to be supported in a state of being separated from the rail member. A core for forming a magnetic path of a magnetic flux due to a current flowing through the power supply line; a secondary coil wound around the core; and a cargo handling means for performing work based on the electric power induced in the secondary coil. In a non-contact power feeding device including a moving body, a magnetic coupling variable mechanism that strengthens magnetic coupling between the power feeding line and a secondary coil by changing a distance between the rail member and the core, and work by the cargo handling means. And a drive control means for driving the magnetic coupling variable mechanism when performing the above. 2. The contactless power supply device according to claim 1, wherein the variable magnetic coupling mechanism shortens a distance between the rail member and the core. 3. The contactless power supply device according to claim 1, wherein the variable magnetic coupling mechanism lengthens a distance between the rail member and the core.