JP2003109833A - Electric power receiving core and electric power supply system to moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power receiving core for suppressing leakage of a magnetic flux to the outside and an electric power supply system to a moving body having an electric power receiving part using the electric power receiving core. SOLUTION: The electric power receiving core 9 is provided with first and second opening sides, and a hollow column-like outer wall frame body having a narrow opening groove 50 connecting the first opening side and the second opening side. The opening groove 50 is regulated between an end face 51 of an upper wall plate 9e and an end face 52 of an upper wall plate 9f. In addition, the electric power receiving core 9 is provided with an inner wall plate 9c, which extends in a direction where the opening groove 50 extends, and it is formed toward the opening groove 50 so that a top face 53 does not reach the opening groove 50 from an inner face of a bottom wall plate 9a of a part opposite to the opening groove 50. A gap G1 regulated by the end face 51 of the upper wall plate 9e and the top face 53 of the inner wall plate 9c and a gap G2 regulated by the end face 52 of the upper wall plate 9f and the top face 53 of the inner wall plate 9c are formed on the electric power receiving core 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a power receiving core and a power feeding system for a moving body having a power receiving portion using the power receiving core, and more particularly to storing and storing and retrieving articles in a warehouse or the like. The present invention relates to a power supply system for a transport vehicle that supplies driving power for traveling to the transport vehicle in a non-contact manner in an automatic storage / retrieval device that automatically performs the transport vehicle.

[0002]

2. Description of the Related Art There is an automatic storage / retrieval device for automatically storing and retrieving and retrieving articles in a warehouse or the like by a carrier. In such an automatic storage / retrieval device, contactless power feeding is performed as a method of feeding driving power for traveling to a carrier vehicle.

FIG. 10 is a perspective view schematically showing the structure of a conventional automatic storage / retrieval device. Desired stocker 1a,
In order to store the article 2 in 1b or to take out the article 2 from the desired stockers 1a and 1b, the transport vehicle 4 including the power receiving unit 105 transports the article 2 while traveling on the rails 3a and 3b. .

FIG. 11 is a cross-sectional view showing the structure near the power receiving section 105 of the transport vehicle 4 together with the rail 3a. Carrier 4
The wheel 10 of is in contact with the upper surface of the rail 3a. The power receiving unit 105 includes a power receiving core 109 having a substantially E-shaped cross section, around which the secondary coil 11 is wound. The power receiving core 109 includes a bottom wall plate 109a and side wall plates 109b and 109.
It has d and the inner wall board 109c. Inner wall board 109c
Is almost equal to the height of the side wall plates 109b and 109d, and the coil 11 is wound around the inner wall plate 109c. In addition, at the upper end of the inner wall plate 109c, the side wall plates 109b, 1
The projecting portions 109e, 1 respectively projecting toward 09d
09f is formed. A gap G101 is formed between the upper end of the side wall plate 109b and the protrusion 109e, and a gap G102 is formed between the upper end of the side wall plate 109d and the protrusion 109f. As shown in FIG. 11, the gap G101 and the gap G102 are formed on the same straight line while being separated from each other. Further, the power receiving core 109 is mounted on the mounting member 8, and the mounting member 8 is fixed to the main body of the transport vehicle 4.

The power supply lines 7a and 7b on the primary side are attached to the mounting member 6
It is attached to the bottom surface of the rail 3a by a and 6b. Actually, the plurality of mounting members 6a and 6b are arranged at equal intervals along the rail 3a. The mounting members 6a and 6b are inserted into the power receiving core 109 through the gaps G101 and G102, respectively, so that the power supply lines 7a and 7b can be connected to the inner space A101 of the power receiving core 109.
It is arranged in each A102. The internal space A
101 is a space defined by the bottom wall plate 109a, the side wall plate 109b, and the inner wall plate 109c.
102 is a space defined by the bottom wall plate 109a, the side wall plate 109d, and the inner wall plate 109c.

[0006]

FIG. 12 shows a power receiving core 1
It is a figure which shows the simulation result regarding the magnetic flux distribution when 09 is excited. As shown in FIG. 12, in the conventional power receiving core 109, leakage of magnetic flux from the gaps G101 and G102 to the outside is large. Therefore, according to the conventional power receiving core 109, the power receiving unit 1 is caused by the leakage of a large magnetic flux.
There was a problem that the power supply efficiency of 05 was lowered. Also,
Since the influence of the leakage magnetic flux on the periphery of the power receiving core 109 becomes large, there is also a problem that installation of a conductive magnetic material such as iron in a position near the power receiving core 109 is restricted.

The present invention has been made to solve the above problems, and is a power feeding system for a mobile body having a power receiving core in which leakage of magnetic flux to the outside is suppressed, and a power receiving unit using the power receiving core. The purpose is to obtain.

[0008]

[Means for Solving the Problems] Claim 1 of the present invention
The power receiving core according to claim 1, which has a hollow columnar outer wall frame having first and second opening side surfaces facing each other, and an opening groove connecting the first opening side surface and the second opening side surface, and an opening groove. Is formed to extend in the extending direction, and an inner wall plate formed toward the opening groove from the inner surface of the outer wall frame body in the portion facing the opening groove so that the top surface does not reach the opening groove. The opening groove is defined by a first end surface and a second end surface of the outer wall frame body facing each other, and a first gap defined by the first end surface of the outer wall frame body and the top surface of the inner wall plate, and the outer wall It is characterized in that a second gap defined by the second end face of the frame body and the top face of the inner wall plate is formed.

Further, the power receiving core according to a second aspect of the present invention is the power receiving core according to the first aspect, wherein the power receiving core extends in a direction in which the opening groove extends and is on the top surface of the inner wall plate. Formed,
It is characterized in that it further comprises a magnetic member which is wider than the top surface and isotropic in magnetization.

According to a third aspect of the present invention, there is provided a power supply system for a mobile body, wherein a power supply line is arranged along a track along which the mobile body travels, and a power supply section provided to the mobile body is supplied. A power supply system for supplying electric power from an electric wire to a mobile body, wherein the power supply line includes first and second power supply lines held along a track by a holding member, and the power receiving unit includes: The power receiving core according to claim 1 or 2, wherein the holding member is inserted into the power receiving core through the opening groove and the first and second gaps, whereby the first and second power feeding lines are connected to the power receiving core. It is characterized by being disposed in the internal space.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a perspective view schematically showing the configuration of the automatic storage / retrieval device according to the first embodiment of the present invention. In order to store the articles 2 in the desired stockers 1a and 1b, or the desired stocker 1
In order to take out the article 2 from a and 1b, the carrier vehicle 4 including the power receiving unit 5 carries the article 2 while traveling on the rails 3a and 3b.

FIG. 2 is a sectional view showing the structure of the automatic storage / retrieval apparatus according to the first embodiment in the vicinity of the power receiving section 5 of the transport vehicle 4 together with the rail 3a. Wheels 10 of carrier 4
Is in contact with the upper surface of the rail 3a. The power receiving unit 5 has a power receiving core 9 around which a secondary coil 11 is wound. The power receiving core 9 is mounted on the mounting member 8,
The mounting member 8 is fixed to the main body of the transport vehicle 4.

FIG. 3 is a perspective view showing the structure of the power receiving core 9 together with the mounting member 8. Referring to FIG. 3, power receiving core 9
Is a hollow columnar shape having first and second opening side surfaces (side surfaces existing in the YZ plane) facing each other, and a narrow opening groove 50 connecting the first opening side surface and the second opening side surface. It has an outer wall frame. The outer wall frame body has a bottom wall plate 9a, side wall plates 9b and 9d, and upper wall plates 9e and 9f. The side wall plate 9b is connected to the bottom wall plate 9a, and the upper wall plate 9e is connected to the side wall plate 9a.
It is connected to b. The side wall plate 9d is connected to the bottom wall plate 9a, and the upper wall plate 9f is connected to the side wall plate 9d. The opening groove 50 is defined between the end surface 51 of the upper wall plate 9e and the end surface 52 of the upper wall plate 9f facing each other. Further, the power receiving core 9 includes an inner wall plate 9c, and the inner wall plate 9c extends in a direction (X direction) in which the opening groove 50 extends and is a bottom wall plate of a portion facing the opening groove 50. From the inner surface of 9a to the top surface 5
3 is formed toward the opening groove 50 so as not to reach the opening groove 50. The height of the inner wall plate 9c is the same as that of the side wall plates 9b, 9
It is lower than the height of d.

With this structure, as shown in FIG. 2, the power receiving core 9 has a gap G1 defined by the end surface 51 of the upper wall plate 9e and the top surface 53 of the inner wall plate 9c, and the upper wall plate 9f.
A gap G2 defined by the end surface 52 of the inner wall plate 9c and the top surface 53 of the inner wall plate 9c is formed. The gap G1 and the gap G2 are formed to face each other in a substantially V shape with the top surface 53 of the inner wall plate 9c as one common end. Note that FIG.
In the above, a hollow quadrangular prism-shaped outer wall frame is shown, but it may be, for example, a hollow cylindrical outer wall frame.

Referring to FIG. 2, the coil 11 includes an inner wall plate 9c.
Is wrapped around. The power supply lines 7a and 7b on the primary side are held by a holding member 6, which holds the rail 3a.
It is attached to the bottom of the. Actually, a plurality of holding members 6 are arranged at equal intervals along the rail 3a. After being inserted into the power receiving core 9 from the opening groove 50, the holding member 6 is branched in the directions of the gaps G1 and G2, whereby the power feeding lines 7a and 7b are separated from each other by the internal space A of the power receiving core 9.
1 and A2, respectively. The internal space A
1 is a space defined by the bottom wall plate 9a, the side wall plate 9b, the upper wall plate 9e, and the inner wall plate 9c, and the internal space A2
Is a space defined by the bottom wall plate 9a, the side wall plate 9d, the upper wall plate 9f, and the inner wall plate 9c.

FIG. 4 shows the power receiving core 9 according to the first embodiment.
It is a cross-sectional view showing the structure of. The power receiving core 9 has a thickness of several 1
As shown in FIG. 4, a plurality of amorphous thin films 91 to 95 each having a thickness of about 0 μm (only five layers are shown in FIG. 4 for simplification of the drawing) are laminated. Upper wall plate 9e,
At the end faces 51, 52 of 9f, the upper wall plates 9e, 9f
The thin films 91 to 95 are exposed on the respective bottom surfaces of the.

FIG. 5 shows the power receiving core 9 according to the first embodiment.
It is a figure which shows the simulation result regarding the magnetic flux distribution at the time of exciting. As can be seen from a comparison between FIG. 5 and FIG. 12, the power receiving core 9 according to the first embodiment suppresses the leakage of magnetic flux from the gaps G1 and G2 to the outside as compared with the conventional power receiving core 109. There is. One of the reasons is as follows. Referring to FIG. 2, it is assumed that a current flows through power supply line 7a from the front to the back of the paper and a current flows through power supply line 7b from the back to the front of the paper.
Then, the end face 51 part and the end face 52 part become N poles,
The top surface 53 becomes the south pole. Focusing on the gap G1, in addition to the pair of N poles (end face 51) and S pole (top face 53) existing at both ends of the gap G1, in addition to the other N pole in the direction in which the magnetic flux leaks. (End face 52) exists. Therefore, in the conventional power receiving core 109, the N pole and the S pole are only attracted to each other, whereas in the power receiving core 9 according to the first embodiment, the N pole (end face 51) and the S pole (top face 5).
In addition to the attraction of 3), the action of repelling the leakage of magnetic flux occurs due to the other N pole (end face 52). As a result, the repulsed magnetic flux returns to the S pole, so that leakage of the magnetic flux to the outside is suppressed.

As described above, according to the power receiving core 9 of the first embodiment, leakage of magnetic flux from the gaps G1 and G2 to the outside can be suppressed as compared with the conventional power receiving core 109. As a result, the power supply efficiency of the power receiving unit 5 is improved, and thus a large output power (secondary side) can be obtained for the same input power (primary side). Further, since the influence of the leakage magnetic flux on the periphery of the power receiving core 9 can be suppressed, it is possible to install a conductive magnetic body such as iron in a position near the power receiving core 9, and the degree of freedom in design can be increased.

FIG. 6 is a diagram showing a modification of the shape of the power receiving core 9. Even with the power receiving core having the shape shown in FIG. 6, leakage of magnetic flux from the gap to the outside is suppressed, and the same effect as described above can be obtained.

Embodiment 2. FIG. 7 is a cross-sectional view showing the structure near the power receiving section 5 of the carrier 4 together with the rail 3a in the automatic storage / retrieval apparatus according to the second embodiment of the present invention, and FIG. 8 is related to the second embodiment. 6 is a cross-sectional view showing the structure of a power receiving core 9. FIG. On the top surface 53 of the inner wall plate 9c, the magnetic material 1 extends in the direction in which the opening groove 50 extends (X direction).
2 is formed. The width of the magnetic body 12 in the Y direction is wider than the width of the inner wall plate 9c in the Y direction, and when viewed from the Z direction, the upper wall plates 9e and 9f and the magnetic body 12 partially overlap. Further, the magnetic body 12 is a magnetic isotropic magnetic body integrally formed by baking ferrite powder. In the present specification, “magnetization isotropic” means a property that the molded shape has low magnetic anisotropy and is easily magnetized relatively uniformly in any direction. Other structures of the power receiving unit 5 according to the second embodiment are similar to the structure of the power receiving unit 5 according to the first embodiment.

FIG. 9 shows a power receiving core 9 according to the second embodiment.
It is a figure which shows the simulation result regarding the magnetic flux distribution at the time of exciting. As shown in the simulation result of FIG. 5, the power receiving core 9 according to the first embodiment.
Then, the magnetic flux tends to concentrate near the top surface 53 of the inner wall plate 9c, and this portion saturates quickly, so there is a possibility that the capacity of the power receiving core 9 cannot be fully utilized. On the other hand, as shown in the simulation result of FIG. 9, in the power receiving core 9 according to the second embodiment, the inner wall plate 9c
The magnetic flux concentrated in the vicinity of the top surface 53 is uniformly dispersed in the width direction (Y direction) of the magnetic body 12.

As described above, according to the power receiving core 9 of the second embodiment, since the wide and magnetizing isotropic magnetic body 12 is provided on the top surface 53 of the inner wall plate 9c, locally concentrated magnetic flux is generated. It is possible to avoid that the capacity of the power receiving core 9 is suppressed due to the saturation.

[0023]

According to the first aspect of the present invention, it is possible to suppress the leakage of the magnetic flux from the first and second gaps to the outside of the power receiving core.

According to the second aspect of the present invention, it is possible to prevent the ability of the power receiving core from being suppressed by the saturation of the locally concentrated magnetic flux.

According to the third aspect of the present invention, since the power feeding efficiency of the power receiving section is improved, a large output power (secondary side) can be obtained for the same input power (primary side). You can Further, since the influence of the leakage magnetic flux on the periphery of the power receiving core can be suppressed, it becomes possible to install a conductive magnetic body such as iron at a position close to the power receiving core, and the degree of freedom in design can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a configuration of an automatic storage / retrieval device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a structure near a power receiving portion of a carrier together with a rail in the automatic storage / retrieval device according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a structure of a power receiving core together with a mounting member.

FIG. 4 is a cross-sectional view showing the structure of the power receiving core according to the first embodiment of the present invention.

FIG. 5 is a diagram showing simulation results regarding magnetic flux distribution when the power receiving core according to the first embodiment is excited.

FIG. 6 is a diagram showing a modification of the shape of the power receiving core.

FIG. 7 is a cross-sectional view showing a structure near a power receiving portion of a carrier together with a rail in an automatic storage / retrieval device according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing a structure of a power receiving core according to a second embodiment of the present invention.

FIG. 9 is a diagram showing simulation results regarding magnetic flux distribution when the power receiving core according to the second embodiment of the present invention is excited.

FIG. 10 is a perspective view schematically showing a configuration of a conventional automatic storage / retrieval device.

FIG. 11 is a cross-sectional view showing a structure near a power receiving unit of a conventional carrier along with a rail.

FIG. 12 is a diagram showing a simulation result regarding a magnetic flux distribution when a conventional power receiving core is excited.

[Explanation of symbols]

3a, 3b rail 4 carrier 5 Power receiving section 6 holding member 7a, 7b power supply line 9 Power receiving core 12 Magnetic material 50 open groove

Claims (3)

[Claims] 1. A hollow columnar outer wall frame body having first and second opening side surfaces facing each other, and an opening groove connecting the first opening side surface and the second opening side surface, and the opening. The groove is formed to extend in the extending direction, and
From the inner surface of the outer wall frame body of the portion facing the opening groove,
An inner wall plate formed toward the opening groove so that the top surface does not reach the opening groove, the opening groove is defined by a first end surface and a second end surface of the outer wall frame body facing each other, A first gap defined by the first end surface of the outer wall frame and the top surface of the inner wall plate, and a second gap defined by the second end surface of the outer wall frame and the top surface of the inner wall plate. A power receiving core, wherein a second gap is formed. 2. A magnetic isotropic magnetic member, which is formed on the top surface of the inner wall plate and extends in a direction in which the opening groove extends, and is wider than the top surface. The power receiving core according to Item 1. 3. A power supply system for a mobile body, wherein a power supply line is arranged along a track along which the mobile body travels, and electric power is supplied from the power supply line to the power receiving section of the mobile body in a contactless manner. The power supply line includes first and second power supply lines held by a holding member along the track, and the power receiving unit has the power receiving core according to claim 1 or 2. The holding member is inserted into the power receiving core through the opening groove and the first and second gaps, so that the first and second power supply lines are arranged in the internal space of the power receiving core. A power supply system for moving objects.