JP2003086441A - Non-contact power feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power feeding device, capable of unitizing a power-receiving device with a pickup coil wound around a magnetic core, automatically manufacturing a secondary power-receiving device, and improving magnetic coupling by approximating a primary conducting wire to the secondary pickup coil, as close as possible. SOLUTION: In a non-contact power feed device for feeding power from current of the primary conducting wire connected to a power supply to the secondary pickup coil in non-contact manner, a slit 4, through which the primary conducting wire is inserted in one side of a square-cylindrical magnetic core 2 is formed, and the pickup coil 1 is wound around one side opposing to the slit 4 of the magnetic core 2.

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 feeding device such as a carrier vehicle by electromagnetic induction, and more particularly to a power receiving device in which a pickup coil is wound around a magnetic core is unitized and a secondary side power receiving device The present invention relates to a non-contact power supply device that can be automatically manufactured and that can improve electromagnetic coupling by bringing a primary side conductive wire and a secondary side pickup coil as close as possible.

[0002]

2. Description of the Related Art For example, in the transportation of semiconductors, liquid crystals and the like in manufacturing processes, it is extremely avoided to pollute the clean environment in these processes. Therefore, in order to avoid dust caused by contact, electric power is also supplied to the carrier vehicle for carrying between steps without contact. This contactless power supply device has a conductor connected to a power source.
While the secondary side is fixedly arranged, a power receiving device in which a pickup coil is wound around a magnetic core is disposed on the carrier side, and electric power is electromagnetically induced from the current flowing to the primary side to the secondary side pickup coil. Non-contact.

In such a conventional non-contact power feeding device, for example, as disclosed in Japanese Unexamined Patent Publication No. 2000-358301, an E-type magnetic core is provided to improve the electromagnetic coupling between the primary side and the secondary side. Using the opening of the E-shaped core, the secondary side of the E-shaped core wound around the central leg of the E-shaped core is made to pass through the two windows through which the primary side conductors having different directions of current flow are inserted. The contactless power supply was performed by the coil. The respective magnetic fluxes produced by the primary side conductors in the two windows, in which the currents flow in different directions, are in the same direction in the central leg of the E-shaped core and are added, so one magnetic flux wound around the central leg is used. The secondary coil has an advantage that electromagnetic coupling between the primary side and the secondary side can be efficiently performed.

[0004]

The conventional E-type core is manufactured by joining two rectangular cylindrical magnetic cores in parallel and cutting out the lower two sides. Since the secondary coil is wound on the central leg of the core, the core requires a relatively expensive process. Also, E
When a die core is used, in order to improve the electromagnetic coupling between the primary side and the secondary side, the joined rectangular tubular cores are usually cut so that the tips of the central legs have an inverted T shape. As described above, as a result of forming the tip of the central leg into the inverted T shape, there is a drawback that automation of the winding work in the central leg is difficult.

Further, in order to improve the electromagnetic coupling between the primary side and the secondary side, it is desired that the primary side conductive wire is brought as close as possible to the secondary side coil wound around the central leg. As a result of the inverted T-shaped portion at the tip of the central leg portion offsetting the installation position of the primary side conductor wire, the primary side conductor wire cannot be brought close to the secondary side coil of the central leg portion as desired. There is a drawback that.

On the other hand, a method for economically realizing a large capacity of the non-contact power feeding device is to reduce the number of turns of the secondary coil, but the magnetomotive force of the secondary coil is equal to the capacity of the non-contact power feeding device. Regardless, there is 80% of the primary side current, so if the number of turns of the secondary side coil is reduced in order to increase the capacity of the non-contact power supply device, the secondary side coil current increases in inverse proportion to the number of turns. Therefore, a thick wire is used in order to suppress the temperature rise of the winding within an allowable range, but it is difficult to wind the thick wire around the center leg of the E-shaped core. Further, in the non-contact power feeding device, an electric resonance phenomenon is used, and the self-inductance of the secondary coil of the non-contact power feeding device must be set to an accurate predetermined value, and the number of turns due to a thick wire is small. 2 with a predetermined value of this self-inductance
Fabricating the secondary coil is difficult.

Further, in a non-contact power feeding device mounted on a carrier of a carrier system composed of a movable carrier,
Since a high-frequency current in the vicinity of kHz is used, a simple thick wire or an inexpensive thick wire composed of a small number of thick wires in parallel is not suitable, and a large number of ultrafine wires such as litz wires are not suitable. It requires expensive thick strands of wire twisted together at a short pitch. Furthermore, there is a constant demand for miniaturization of non-contact power feeding devices, but it is considered that the ultimate miniaturization can be realized by a magnetic coupling between one primary side conductor and a pickup coil. The ultimate miniaturization is difficult in a contactless power feeding device in which two primary side conductors are inserted into two windows.

In view of the problems of the above-mentioned conventional non-contact power feeding device, the present invention unitizes a power receiving device in which a pickup coil is wound around a magnetic core and enables automatic production of this secondary power receiving device. Another object of the present invention is to provide a non-contact power supply device capable of improving electromagnetic coupling by bringing the primary side conductive wire and the secondary side pickup coil as close to each other as possible.

[0009]

In order to achieve the above object, the contactless power supply device of the present invention uses an electromagnetic induction to transfer electric power from a current of a primary side wire connected to a power source to a secondary side pickup coil. In a non-contact power supply device that supplies in a non-contact manner, a slit for inserting a primary conductor into a cylindrical hole is formed on one side of a square tubular magnetic core, and a pickup coil is provided on one side facing the slit of the magnetic core. It is characterized by being wound.

In this non-contact power feeding device, a slit for inserting the primary conductor into a cylindrical hole is formed on one side of a square tubular magnetic core, and a pickup coil is provided on one side facing the slit of the magnetic core. Since the coil is wound, the winding can be used to automatically and accurately wind the pickup coil around the opposite side using the slit, which facilitates the automation of the winding work and adds it to the magnetic core. Since the number of processes is smaller than in the past, it is possible to manufacture a contactless power supply device with uniform inductance characteristics in a short time and at low cost. Then, by winding the pickup coil around one side facing the slit of the magnetic core, the primary-side conducting wire and the secondary-side pickup coil can be brought as close as possible to each other. It is possible to improve the electromagnetic coupling on the secondary side and improve the performance of the contactless power supply device.

In this case, the two magnetic cores may be arranged side by side so that the sides around which the pickup coils are wound are in series, and the respective magnetic cores may be disposed so that adjacent sides abut. .

This makes it possible to easily manufacture a non-contact power feeding device such as a conventional E-shaped core which allows two primary side conductors to be inserted therethrough. No expensive processing is required to join the coil as the central leg for winding the coil, and the core completed as a unit in which the coil is wound is simply combined, so that the contactless power supply device can be used in a short time and at a low cost. It can be manufactured at a cost. Further, by winding the pickup coil around one side facing the slit of the magnetic core, the offset due to the conventional inverted T-shaped portion is eliminated, and the primary side conductive wire and the secondary side pickup coil are made as close as possible. As a result, the electromagnetic coupling between the primary side and the secondary side can be improved and the performance of the contactless power supply device can be improved. Further, since there are two pickup coils on the secondary side, each pickup coil can share half of the primary current magnetomotive force, which allows a conventional pickup coil to be wound around the central leg. The magnetomotive force to be borne is halved compared to the E-type core, and the secondary coil can be wound using thinner strands, and depending on the conditions, an expensive litz wire in which a large number of ultrafine wires are twisted at a short pitch Instead of, a cheaper wire rod formed by twisting a small number of thick thin wires can be used.

Further, a plurality of the magnetic cores may be arranged in series so that the sides around which the pickup coils are wound are parallel to each other.

As a result, a non-contact power feeding device having a capacity equal to or larger than that of the conventional one can be constructed with one primary conductor wire, and the cross-sectional area of the magnetic core can be half that of the conventional E-shaped core. It is possible to reduce the size of the device and the cross-sectional area of the guideway to reduce the manufacturing cost of the entire transportation system using the transportation vehicle. Further, by winding the pickup coil around one side facing the slit of the magnetic core, the primary side conductive wire and the secondary side pickup coil can be made as close as possible, whereby the primary side and It is possible to improve the electromagnetic coupling on the secondary side and improve the performance of the contactless power supply device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the non-contact power feeding device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the non-contact power feeding device of the present invention. This non-contact power feeding device supplies electric power from a current of a primary side conducting wire (not shown) connected to a power source to the secondary side pickup coil 1 by electromagnetic induction in a non-contact manner, as shown in FIG. A slit 4 for inserting the primary conductor of the lower side 2a of the rectangular tubular magnetic core 20 into the tubular hole 3 is formed, and the pickup coil 1 is wound around the upper side 2b of the magnetic core 2 that faces the slit 4. . In this case, the slit 4 is formed in the center of the lower side 2a, and the pickup coil 1 is wound around the center of the upper side 2b so as to face the slit 4. Then, a primary side conductor (not shown) is inserted into the cylindrical hole 3 of the magnetic core 2 to construct a non-contact power supply device to be mounted on a transportation system including a transportation vehicle.

The magnetic core 2 of the first embodiment in which the pickup coil 1 is wound is the basic structure of the power receiving device of the contactless power feeding device of the present invention, and the magnetic core 2 is combined as a unit. As a result, it is possible to manufacture a new non-contact power feeding device as shown in the second and third embodiments described later.

Thus, in the non-contact power feeding device of the first embodiment, the slit 4 for inserting the primary conductor into the cylindrical hole 3 is formed on the lower side 2a of the rectangular cylindrical magnetic core 2, and the magnetic core 2 is also formed. Since the pickup coil 1 is wound around the upper side 2b facing the slit 4 of the above, the primary side conductor wire and the secondary side pickup coil can be brought as close as possible to each other. The performance of the contactless power supply device can be improved by improving the electromagnetic coupling on the side. Further, by winding the pickup coil 1 around the upper side 2b of the position facing the slit 4, the slit 4 is used to automatically and accurately wind the pickup coil 1 using a dedicated winding machine. In addition to the fact that the number of processes to be applied to the magnetic core 2 is smaller than in the past, it is possible to manufacture a contactless power supply device with uniform inductance characteristics in a short time and at low cost.

FIG. 2 shows a second embodiment of the contactless power supply system of the present invention. This non-contact power feeding device uses two magnetic cores 2 of the first embodiment, and the two magnetic cores 2 are arranged so that the upper side 2b around which the pickup coil 1 is wound is in series.
Are arranged side by side, and each magnetic core 2 is attached to the adjacent side 2
They are abutted and bonded so that c and the side edge 2d come into contact with each other. Note that it is also possible to bring the two magnetic cores 2 into contact with each other by fixing means to the transport vehicle without adhering the side edges 2c and 2d. Then, two primary side conductors (not shown) in which the directions of the currents flowing in the magnetic cores 2 are different from each other are inserted into the respective cylindrical holes 3 of the magnetic core 2, and a non-contact power supply device mounted in a transport system including a transport vehicle is installed. I'm building. In this case, in each magnetic core 2, current extraction is performed independently for each pickup coil 1.

The non-contact power feeding device of the second embodiment is similar in form to a conventional non-contact power feeding device in which a pickup coil is wound around a central leg of an E-shaped core. However, in the non-contact power feeding device of the second embodiment, the power receiving device can be constructed by simply combining the magnetic cores 2 already completed as a unit, and the magnetic core 2 is formed as in the conventional case.
It is not necessary to individually join to form an E-type magnetic core, and the expensive processing required for this joining is unnecessary. Further, since there is no pickup coil in the portions 2c and 2d corresponding to the central leg portion of the conventional E-shaped core, the primary coil is formed by the inverted T-shaped portion at the tip of the central leg portion of the E-shaped core as in the conventional case. Since the installation position of the side conductor is not offset, the primary conductor can be brought as close as possible to the pickup coil 1.

Further, in the non-contact power supply system of the second embodiment, since there are two pickup coils 1 on the secondary side,
It is possible for each pickup coil 1 to divide and share 80% or more of the primary current magnetomotive force. This allows
Compared with the conventional E-type core in which one pickup coil is wound around the central leg, the magnetomotive force to be borne is halved, and a thinner coil can be used to wind the secondary coil. Depending on the conditions, it is possible to use an inexpensive litz wire formed by twisting a small number of thick thin wires instead of the expensive litz wire formed by twisting a large number of ultrafine wires at a short pitch.

Since the pickup coil 1 is already automatically wound by a machine in the basic unit as in the first embodiment, the winding work of the central leg, which is difficult to automate as in the conventional case, is unnecessary. In addition, compared to the conventional E-shaped core in which one pickup coil is wound around the central leg, the number of pickup coils 1 is doubled, which is disadvantageous.
As shown in FIGS. 1 and 2, since the pickup coil 1 is wound at the position farthest from the slit 4 of the magnetic core 2, the pickup coil 1 is wound more than the conventional pickup coil wound around the central leg portion near the opening of the core. Also has good magnetic coupling with the primary current,
If the number of windings is the same, the output is larger than that of the conventional E-type core having the pickup coil wound around the central leg.

FIG. 3 shows a third embodiment of the contactless power supply system of the present invention. The contactless power supply device of the third embodiment is the first
Two or more magnetic cores 2 of the embodiment are used, and the upper side 2b around which the pickup coil 1 is wound is arranged in parallel.
Two magnetic cores 2 are arranged in series. Then, one primary-side conductive wire (not shown) is inserted into each cylindrical hole 3 of the magnetic core 2 arranged in series in a non-contact state. In this case, in each magnetic core 2, current extraction is performed independently for each pickup coil 1.

Thus, in the non-contact power feeding device of the third embodiment, a plurality of magnetic cores 2 around which the pickup coil 1 is wound are arranged in series, so that the cross-sectional area is half that of the conventional E-type core. While realizing a contactless power supply,
By increasing the number of the magnetic cores 2, it is possible to increase the capacity of the contactless power feeding device while maintaining a half cross-sectional area. If the cross-sectional area of the contactless power feeding device is reduced, the cross-sectional area of the guideway can be reduced, which can reduce the manufacturing cost of the entire transport system including the movable transport vehicle equipped with the non-contact power feeding device. it can.

Further, in this non-contact power feeding device, the primary coil and the secondary pickup coil 1 can be formed by winding the pickup coil 1 around the upper side 2b facing the slit 4 of the magnetic core 2. As far as possible, it is possible to improve the electromagnetic coupling between the primary side and the secondary side and improve the performance of the contactless power supply device.

The contactless power supply device of the present invention is as described above.
Although described based on the embodiment, the present invention is not limited to the structure described in the embodiment, and the structure can be appropriately changed without departing from the spirit of the invention.

[0027]

According to the non-contact power feeding device of the present invention, a slit for inserting the primary conductor into the cylindrical hole is formed on one side of the rectangular tubular magnetic core, and the slit faces the magnetic core. Since the pickup coil is wound around one side,
By using the slit, the pickup coil can be automatically and accurately wound around the opposite side by the winding machine.
Since the automation of the winding work is facilitated and the number of processes to be applied to the magnetic core is smaller than in the conventional case, it is possible to manufacture a contactless power supply device with uniform inductance characteristics in a short time and at low cost. Then, by winding the pickup coil around one side facing the slit of the magnetic core, the primary-side conducting wire and the secondary-side pickup coil can be brought as close as possible to each other. Two
The performance of the contactless power supply device can be improved by improving the electromagnetic coupling on the secondary side.

Further, two magnetic cores are arranged side by side so that the sides around which the pickup coils are wound are in series, and the magnetic cores are arranged so that adjacent sides come into contact with each other. It is possible to easily manufacture a non-contact power feeding device such as an E-shaped core, through which two primary-side conductive wires are inserted, and moreover, like a conventional E-shaped core, a central leg around which adjacent coils are wound. The expensive processing of joining as a part is unnecessary, and since the core completed as a unit in which the coil is wound is simply combined, the contactless power feeding device can be manufactured in a short time and at low cost.
Then, by winding the pickup coil around one side facing the slit of the magnetic core, the offset due to the inverted T-shape portion in the related art is eliminated, and the primary side conductive wire and the secondary side pickup coil are made as close as possible. As a result, the electromagnetic coupling between the primary side and the secondary side can be improved and the performance of the contactless power supply device can be improved. Further, since there are two pickup coils on the secondary side, each pickup coil can share half of the primary current magnetomotive force, which allows a conventional pickup coil to be wound around the central leg. The magnetomotive force to be borne is halved compared to the E-type core, and the secondary coil can be wound using thinner strands, and depending on the conditions, an expensive litz wire in which a large number of ultrafine wires are twisted at a short pitch Instead of, a cheaper wire rod formed by twisting a small number of thick thin wires can be used.

Further, by arranging a plurality of the magnetic cores in series so that the sides around which the pickup coils are wound are parallel to each other, a single primary side conductor wire has a non-contact with a capacity equal to or more than the conventional one. Since the cross-sectional area of the magnetic core can be reduced to half that of the conventional E-shaped core while configuring the power feeding device, the contactless power feeding device can be downsized and the cross-sectional area of the guideway can be reduced to produce the entire transportation system by the transportation vehicle. The cost can be reduced. Then, by winding the pickup coil around one side facing the slit of the magnetic core, the primary-side conducting wire and the secondary-side pickup coil can be brought as close as possible to each other. Two
The performance of the contactless power supply device can be improved by improving the electromagnetic coupling on the secondary side.

[Brief description of drawings]

FIG. 1 is a perspective view showing a non-contact power supply device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a non-contact power supply device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a contactless power supply device according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing an original shape of a square tubular magnetic core used in the present invention.

[Explanation of symbols]

1 pickup coil 2 magnetic core 2a bottom 2b upper side 2c, 2d side 3 tube holes 4 slits

Claims (3)

[Claims] 1. A contactless power supply device for supplying electric power from a current of a primary side wire connected to a power source to a pickup coil on a secondary side by electromagnetic induction in a contactless manner. One side of a square tubular magnetic core. A non-contact power supply device, characterized in that a slit for inserting the primary side wire into the cylindrical hole is formed in and a pickup coil is wound around one side facing the slit of the magnetic core. 2. The two magnetic cores are arranged side by side so that the sides around which the pickup coils are wound are in series,
The non-contact power feeding device according to claim 1, wherein the magnetic cores are arranged such that adjacent sides are in contact with each other. 3. The contactless power supply device according to claim 1, wherein a plurality of the magnetic cores are arranged in series so that the sides around which the pickup coils are wound are parallel to each other.