JP4059828B2 - Non-contact power feeding device - Google Patents

Description

  In the present invention, power is supplied to each load from a power supply line that is a primary circuit connected to a high-frequency power source via a pickup unit that is a secondary circuit that is magnetically coupled in a physically non-contact state. The present invention relates to a non-contact power supply apparatus.

  Monorail transport equipment is widely used in factories or warehouses, and driving power to a motor for traveling mounted on a transport vehicle is supplied via a feeder line laid along the guide rail. .

  As one of the power supply devices using a power supply line, an induced electromotive force generated in the pickup section when an AC current is passed through the power supply line by bringing the pickup section provided in the transport vehicle close to the power supply line in a non-contact state. There is known a non-contact power supply device that acquires power as an electric power (see, for example, Patent Document 1). A power receiving circuit (secondary circuit) including a pickup unit includes a resonance circuit that resonates at the frequency of an alternating current flowing in the power supply line. Yes.

  FIG. 12 is a schematic cross-sectional view showing a configuration example of a conventional non-contact power feeding apparatus. In the figure, reference numeral 60 denotes a guide rail having an H-shaped cross section, which is configured by passing an intermediate plate portion perpendicular to each other between two side plate portions parallel to each other. A large number of L-shaped support arms (not shown) are attached in the longitudinal direction of the guide rail 60, and are suspended from the ceiling of the factory or warehouse via these support arms.

  On the other side surface of the middle plate portion, a plurality of support members 64a and 64b that are paired with each other over the entire length in the longitudinal direction of the guide rail 60 are attached. Outward-side power supply line 20a and return-path-side power supply line 20b among the power supply lines connected to the figure are respectively supported.

The pickup section described above includes a pickup core 63 and pickup coils 61a and 61b wound around the pickup core 63. The pickup core 63 is made of a magnetic material, and has three leg portions 63a, 63b, and 63c that are erected at appropriate intervals on a plate-like base portion 63d. The pickup coils 61a and 61b are wound around the middle leg 63b, and when an alternating current flows through the feeder line, a dielectric electromotive force is generated in the pickup coils 61a and 61b and is acquired as electric power. It has become.
Japanese National Publication No. 6-506099

  By the way, in such a conventional non-contact power supply device, in order to increase the power receiving efficiency, it is necessary to reduce the magnetic resistance by reducing the interval between the legs, but the interval between the legs is reduced. In this case, since it is necessary to reduce the outer diameter of the feeder line, the conductor becomes smaller, and the resistance loss of the feeder line is increased.

  Also, since the pick-up coils 61a and 61b of the secondary side circuit are generally wound with litz wire densely, heat is likely to be accumulated inside and supplied so as not to exceed the limit of the heat resistance capability of the insulating film of the litz wire. There was a problem that the power had to be limited. In addition, since a thin litz wire is wound to improve power receiving efficiency, there is a problem that resistance loss is large.

  Further, since the leg portion 63b is interposed between the outward power supply line 20a and the backward power supply line 20b, it is difficult to narrow the distance between the outward power supply line 20a and the backward power supply line 20b. For this reason, the strength of the electric field and magnetic field around the feeder line cannot be lowered, and there is a problem in that it affects the surrounding circuits, devices, and the like.

  The present invention has been made in view of such circumstances, and a magnetic body including four leg portions arranged in parallel at appropriate intervals on a base portion, and one or more wound around the magnetic body. Coil, and the feeder is arranged between the two inner legs, and one side from the shunt provided in the middle of the feeder is between the outer leg and the inner leg. By arranging the other side of the diversion part between the other leg part on the outside and the leg part on the inner side, the heat dissipation effect is excellent, and external circuits, devices, etc. It is an object of the present invention to provide a non-contact power feeding device that can reduce the influence of a magnetic field and an electric field.

  Another object of the present invention is to provide a magnetic body comprising two legs arranged in parallel on the base at an appropriate interval, one or more coils wound around the magnetic body, and a magnetic body. An accommodation portion made of a nonmagnetic conductor to be accommodated, and the feeder line is arranged between the leg portions, and one side and the other side of the diversion portion provided in the middle of the feeder line are arranged outside the leg portion. By providing a certain configuration, it is possible to reduce the influence of a magnetic field and an electric field on an external circuit, device, and the like, and to provide a non-contact power feeding device with high power receiving capability.

In the non-contact power feeding device according to the present invention, a magnetic flux generated by a current flowing in a primary circuit is linked to a secondary circuit formed by winding a coil around a magnetic material, and the primary circuit is transferred to the secondary circuit. In the non-contact power feeding apparatus for supplying electric power, the magnetic body includes a base and two legs arranged in parallel at an appropriate interval on the base, and the primary circuit is divided in the middle A feeding portion formed of a non-magnetic conductor for housing the magnetic body, and a central portion of the housing portion for disposing the forward path to the diversion portion between the two legs. And two second attachments provided to contact the inner side surface of the accommodating part in order to dispose one side and the other side of the diversion part outside the leg part, respectively. And the forward flow side to the flow dividing portion is connected to the first attachment portion, It is attached to one side and the other side respectively to the second attachment portion from said coil, characterized in that are turning each wound of the two legs.

In the present invention, a magnetic body including two legs arranged in parallel at an appropriate interval on the base, a plurality of coils wound around the magnetic body, and a non-container that houses the magnetic body And a power feeding line between leg portions, and one side and the other side of a shunting portion provided in the middle of the power feeding line are arranged outside the leg portion. Therefore, the magnetic flux and electric field generated by the current flowing through the inner power supply line and the magnetic flux and electric field generated by the current flowing through the two outer power supply lines are symmetrical with respect to the inner power supply line. Therefore, they cancel each other outside the power supply line, and the influence of the magnetic field and electric field on external circuits and devices is reduced. In addition, by forming the accommodating portion with a nonmagnetic conductor such as aluminum or copper, it is possible to effectively shield the magnetic field and electric field generated from the power supply line and the magnetic material. In addition, since the coil is wound around the leg portion, power can be received also from the power supply line arranged outside the leg portion, so that the power receiving ability can be improved.

In the case of the present invention, a magnetic body comprising two legs arranged side by side on the base at an appropriate interval, a plurality of coils wound around the magnetic body, and a nonmagnetic material that houses the magnetic body And a feeding portion between the legs, and one side and the other side of the branching portion provided in the middle of the feeding line are arranged outside the legs. Therefore, the magnetic flux and electric field generated by the current flowing through the inner power supply line and the magnetic flux and electric field generated by the current flowing through the two outer power supply lines are symmetrical with respect to the inner power supply line. Therefore, they cancel each other outside the feeder line, and the influence of the magnetic field and electric field on external circuits, devices, etc. is reduced. In addition, by forming the accommodating portion with a nonmagnetic conductor such as aluminum or copper, it is possible to effectively shield the magnetic field and electric field generated from the power supply line and the magnetic material. In addition, since the coil is wound around the leg portion, power can be received also from the power supply line arranged outside the leg portion, so that the power receiving ability can be improved.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating a configuration of a contactless power feeding device according to the present embodiment. In the figure, reference numeral 1 denotes a high-frequency power source, and a power supply line 2 is extended from the high-frequency power source 1 in order to supply power to the transport vehicle 3 that is a moving body. The feed line 2 is formed of a litz wire having a circular cross section, and is turned back from the diversion part 21 in the middle thereof to form the return side feed lines 2a, 2c and the forward path side feed line 2b, and the high frequency power source 1 through the diversion part 22 It is connected to a loop. That is, the feed line 2 has a configuration in which two return path feed lines 2a and 2c are provided separately and one outbound path feed line 2b is shared.

  A non-contact power feeding device 4 is mounted on the transport vehicle 3, and the non-contact power feeding device 4 includes a pickup unit 5 having three pickup coils 51 a, 51 b, 51 c and a power receiving circuit 6, and is close to the power feeding line 2. An electromotive force is obtained through the picked-up pickup unit 5, and power is supplied to the power circuit 7 and the control circuit 8 including the motor of the transport vehicle 3 through the power receiving circuit 6.

  FIG. 2 is an enlarged perspective view of the pickup unit 5, and FIG. 3 is a schematic side view thereof. The pickup unit 5 includes a pickup core 53 formed of a magnetic material, and three pickup coils 51a, 51b, 51c wound around the pickup core 53. Further, each of the power supply lines 2a, 2b, 2c is supported by support members 54a, 54b, 54c so as to be close to the pickup coils 51a, 51b, 51c, respectively. A large number of these support tools 54a, 54b, 54c are installed at appropriate intervals in the direction in which the feeder 2 is laid.

The pickup core 53 has four leg portions 53a, 53b, 53c, and 53d provided upright on one side surface of a rectangular parallelepiped base portion 53e with a predetermined interval (a). Pickup coils 51a, 51b, 51c are wound between the legs. The thickness (t) of the two outer legs 53a and 53d is formed to be approximately 1/3 times the thickness (3t) of the two inner legs 53b and 53c.
Further, the forward-side power supply line 2b is interposed in a region surrounded by the two inner legs 53b and 53c, and a return-side supply is provided in a region surrounded by the inner leg 53b and the outer leg 53a. The electric wire 2a is interposed, and the return-side power supply line 2c is interposed in a region surrounded by the inner leg portion 53c and the outer leg portion 53d.

  In this way, by arranging the return-side feed lines 2a and 2c symmetrically with respect to the forward-side feed line 2b, the magnetic field and electric field generated from the forward-side feed line 2b when current is passed are arranged on the outside thereof. The electronic circuit provided outside the pickup unit 5 as compared with the case of using a pair of power supply lines, because it is possible to cancel by the magnetic field and electric field generated from the two return-side power supply lines 2a, 2c, It is possible to reduce the influence on electronic devices and the like.

  The diameters of the cross sections of the power supply lines 2a, 2b, and 2c are not necessarily the same, and the diameters of the return path power supply lines 2a and 2c may be smaller than the diameter of the forward path power supply line 2b. . In that case, the distance between the leg portions 53a and 53b and between the leg portions 53c and 53d can be reduced, and the magnetic resistance of the space between the leg portions can be reduced. The magnetic coupling degree of the pickup unit 5 is increased, and the power receiving ability can be improved. Further, by reducing the diameter of the power supply line 2 between the leg part 53a and the leg part 53b, and between the leg part 53c and the leg part 53d, the interval between the power supply lines 2a, 2b and 2c can be reduced. The influence of the magnetic field and electric field generated from the feeder line 2 on the surrounding circuits and equipment is reduced.

  Each pickup coil 51a, 51b, 51c is configured to be wound around the base 53e between the respective leg portions, but may be configured to be wound around the two inner leg portions 53b, 53c. Furthermore, the cross section of each feeder 2a, 2b, 2c may be flat.

Embodiment 2. FIG.
In the first embodiment, the pickup coils 51a, 51b, 51c are wound around the base 53e between the leg portions. However, when the cross section of the feeder 2 is flat, the pickup coils 51a, Rather than winding 51b and 51c around the base 53e, the power receiving efficiency is better when wound around the two inner legs 53b and 53c.

  FIG. 4 is a schematic side view of the pickup unit 5 according to the present embodiment. As in the first embodiment, the pickup unit 5 includes a magnetic pickup core 53 and pickup coils 51d and 51e wound around the pickup core 53. Further, the pickup core 53 includes a rectangular parallelepiped base portion 53e and four leg portions 53a, 53b, 53c, and 53d that are erected substantially in parallel at a certain interval on one side surface of the base portion 53e. Is.

  In the present embodiment, the feed line 2 having a flat cross section is used, and the forward path side feed line 2b is interposed between the two inner legs 53b and 53c, and the two return path side feed lines 2a and 2c. Are interposed between the leg portions 53a and 53b and between the leg portions 53c and 53d, respectively. As shown in FIG. 4, the major axis direction of the cross section of the return-side power supply line 2 a is interposed so as to be parallel to the leg portions 53 a and 53 b, and a pickup coil 51 d is wound around the leg portion 53 d. Similarly, the major axis direction of the cross section of the forward path side power supply line 2b is interposed so as to be parallel to the leg parts 53b and 53c, and the major axis direction of the cross section of the return path side power supply line 2c is parallel to the leg parts 53c and 53d. Intervened. By thus supporting the flat return-side power supply lines 2a and 2c and the forward-side power supply line 2b so as to face the pickup coils 51d and 51e, the distance between the legs 53a, 53b, 53c and 53d can be reduced. In addition, since the magnetic resistance of the space can be reduced, the power receiving efficiency can be further increased. Further, by winding the pickup coils 51d and 51e around the inner legs 53b and 53c, the leakage magnetic flux to the back surface of the base 53e can be reduced, and the power receiving efficiency can be increased.

Embodiment 3 FIG.
In the above-described embodiment, the two return-side power supply lines 2a and 2c are separately provided, and the one forward-side power supply line 2b is shared from the shunt portion 21. 2 may be individually connected to the high-frequency power source 1. In this case, there is no connection part in the flow dividing part 21, and laying is easy.

  FIG. 5 is a block diagram illustrating a configuration of the non-contact power feeding apparatus according to this embodiment. In the figure, reference numeral 1 denotes a high-frequency power source, and power supply lines 2 and 2 are extended from the high-frequency power source 1 in order to supply power to the transport vehicle 3 that is a moving body. The feed lines 2 and 2 are made of litz wires having a circular cross section, and are turned back from the folded portions 2P and 2P in the middle to form the return path feed lines 2d and 2g and the forward path feed lines 2e and 2f, respectively. Both ends are connected to the high frequency power source 1 to form a loop.

  A non-contact power feeding device 4 is mounted on the transport vehicle 3, and the non-contact power feeding device 4 includes a pickup unit 5 having three pickup coils 51 a, 51 b, 51 c and a power receiving circuit 6, and feed lines 2, 2. An electromotive force is obtained through a pickup unit 5 that is close to the power supply unit, and power is supplied to a power circuit 7 and a control circuit 8 including a motor of the transport vehicle 3 through a power receiving circuit 6.

  FIG. 6 is a schematic side view of the pickup unit 5 according to the present embodiment. As in the first embodiment, the pickup unit 5 includes a pickup core 53 made of a magnetic material and pickup coils 51a, 51b, 51c wound around the pickup core 53.

  The pickup portion 53 is formed by standing up four leg portions 53a, 53b, 53c, 53d substantially parallel to each other at a certain interval from one side surface of a rectangular parallelepiped base portion 53e. 51b and 51c are wound around the base 53e between each leg part.

  The return-side power supply lines 2d and 2g are supported by the support tools 54a and 54c so as to be arranged between the leg portions 53a and 53b and in the gap between the leg portions 53c and 53d. 2f is supported by the support tool 54b so as to be arranged in the gap between the leg portions 53b and 53c.

  Thus, by arranging the return-side power supply lines 2d and 2g symmetrically outside the forward-side power supply lines 2e and 2f, the magnetic field and electric field generated from the forward-side power supply lines 2e and 2f when a current flows are Since it can be canceled out by a magnetic field and an electric field generated from the two return-side power supply lines 2d and 2g arranged on the outside, it is provided outside the pickup unit 5 as compared with the case where a pair of power supply lines is used. It is possible to reduce the influence on the electronic circuit and electronic equipment.

Embodiment 4 FIG.
The pickup coils 51a, 51b, and 51c do not have to be wound around the base 53e of the pickup core 53 as described above, and may be wound around the two inner leg portions 53b and 53c.

  FIG. 7 is a schematic side view of the pickup unit 5 according to the present embodiment. In the same manner as described above, the pickup core 53 has four leg portions 53a, 53b, 53c, 53d erected substantially in parallel with a rectangular parallelepiped base portion 53e at an appropriate interval. Leg pieces 55, 55, 55, 55 are attached to both side surfaces of the two leg portions 53b, 53c, respectively.

  The pick-up coils 51d and 51e are wound around the two inner leg portions 53b and 53c, and each of the magnetic fluxes generated when current flows through the return-side power supply lines 2d and 2g and the forward-side power supply lines 2e and 2f. Pickup coils 51d and 51e can be efficiently picked up.

Embodiment 5. FIG.
FIG. 8 is a block diagram illustrating the configuration of the non-contact power feeding device according to this embodiment. In the present invention, the three pickup coils 51a, 51b, 51c wound around the base portion 53e of the pickup core 53 or the two pickup coils 51d, 51e wound around the two inner leg portions 53b, 53c are used to supply power. Since the magnetic flux generated when a current flows through the electric wire 2 is picked up, it is possible to connect a control circuit or a power circuit to each of these and to supply power to these circuits.

  In the figure, reference numeral 1 denotes a high-frequency power source, and a power supply line 2 is extended from the high-frequency power source 1 in order to supply power to the transport vehicle 3 that is a moving body. The feeder line 2 is formed of a litz wire having a circular cross section, and is turned back from the shunt portion 21 in the middle thereof to form the return-side feed wires 2a and 2c and the forward-side feed wire 2b, and the high-frequency power source 1 via the shunt portion 22 It is connected to a loop. That is, the feed line 2 has a configuration in which two return path feed lines 2a and 2c are provided separately and one outbound path feed line 2b is shared.

  A non-contact power feeding device 4 is mounted on the transport vehicle 3, and this non-contact power feeding device 4 is connected to a pickup unit 5 having three pickup coils 51 a, 51 b, 51 c and each pickup coil 51 a, 51 b, 51 c. The power receiving circuit 6a, 6b, 6c is provided, and an electromotive force is obtained through the pickup unit 5 close to the power supply line 2. The power receiving circuit 6a supplies power to the control circuit 8, and the power receiving circuit. Power is supplied to the power circuits 7a and 7b via 6b and 6c. As a result, it is possible to obtain a power source insulated from each other and a power source having a different voltage.

Embodiment 6 FIG.
9 to 11 are schematic side views of the pickup unit 5 according to the present embodiment. The pickup unit 5 of the present embodiment includes a magnetic pickup core 53 and pickup coils 51d and 51e wound around the pickup core 53.

  The pickup core 53 has two leg portions 53b and 53c provided upright on a side surface of a rectangular parallelepiped base portion 53e with an appropriate interval therebetween, and between two adjacent leg portions. Leg pieces 55 are provided so as to face each other.

  Further, an aluminum duct 59 having a U-shaped cross section is installed around the pickup core 53 so that the pickup core 53 can be accommodated. A support arm 50 having an L-shaped cross section is attached to one side surface of the duct 59, and is suspended from the ceiling of a factory or a warehouse via these support arms 50. Mounting portions 54d and 54f for the return path power supply lines 2a and 2c are installed at appropriate locations inside the aluminum duct 59, and a support 54e for supporting the forward path power supply line 2b is installed. .

  The feed line 2 of the present embodiment has a flat cross section, and the forward feed line 2b is interposed between the two legs 53b and 53c, and the two return feed lines 2a and 2c are made of aluminum. It is attached to attachment parts 54d and 54f provided inside the duct 59.

  As described above, the pickup core 53 is surrounded by the aluminum duct 59, so that the spread of the magnetic field generated from the return-side power supply lines 2a and 2c can be suppressed and the pickup coils 51d and 51e can efficiently pick up the magnetic field. This makes it possible to increase power reception efficiency. In addition, the magnetic and electric fields can be effectively shielded by the aluminum duct 59.

  Further, as shown in FIG. 10, when the protrusions 57 and 57 are provided at the outer ends of the leg portions 53d and 53c, respectively, the configuration is such that the return-side power supply lines 2a and 2c are surrounded. The contribution of the electromotive force by 2b becomes high.

  Further, as shown in FIG. 11, by providing the attachment portions 54d and 54f of the return-side power supply lines 2a and 2c below the aluminum duct 59, the size of the cross-sectional shape including the aluminum duct 59 is reduced. can do.

It is a block diagram explaining the structure of the non-contact electric power supply which concerns on this Embodiment. It is an expansion perspective view of a pickup part. It is a typical side view of a pickup part. It is a typical side view of the pickup part which concerns on this Embodiment. It is a block diagram explaining the structure of the non-contact electric power supply which concerns on this Embodiment. It is a typical side view of the pickup part which concerns on this Embodiment. It is a typical side view of the pickup part which concerns on this Embodiment. It is a block diagram explaining the structure of the non-contact electric power supply which concerns on this Embodiment. It is a typical side view of the pickup part which concerns on this Embodiment. It is a typical side view of the pickup part which concerns on this Embodiment. It is a typical side view of the pickup part which concerns on this Embodiment. It is typical sectional drawing which shows the structural example of the conventional non-contact electric power supply.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency power supply 2 Feeding line 2a Returning side feeding line 2b Outgoing side feeding line 2c Returning side feeding line 3 Carrier vehicle 4 Non-contact feeding device 5 Pickup part 51a, 51b, 51c Pickup coil 53 Pickup core 53a, 53b, 53c, 53d Leg Part 53e Base 6 Power receiving circuit 7 Power circuit 8 Control circuit

Claims (1)

In a non-contact power feeding device that links magnetic flux generated by a current flowing in a primary side circuit to a secondary side circuit formed by winding a coil around a magnetic body, and supplies power from the primary side circuit to the secondary side circuit,
The magnetic body includes a base and two legs arranged in parallel at an appropriate interval on the base, and the primary circuit includes a feeder line provided with a shunt in the middle, A housing part made of a non-magnetic conductor that houses a magnetic body, and a first mounting part provided at a central part of the housing part in order to dispose the forward path side to the diversion part between the two leg parts, Two second mounting portions provided so as to be in contact with the inner side surface of the housing portion in order to dispose one side and the other side of the branch portion on the outside of the leg portion, respectively, The forward path side is attached to the first attachment part, the one side and the other side from the diversion side are attached to the second attachment part, respectively, and the coil is wound around each of the two leg parts. A non-contact power feeding device.

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