JPH08168195A - Noncontact power supply transfer system - Google Patents

Abstract

PURPOSE: To realize noncontact power supply to a carrier by a constitution wherein the carrier is transferred while feeding a motor with power from feeders located in two openings of an E-shaped core and when the carrier arrives at the end of a unit power supply section the carrier rides over a microgap and transferred to an adjacent unit power supply section. CONSTITUTION: Each carrier 1 is transferred while being fed with power from feeder lines 4a, 4b located in two openings of an E-shaped core. Upon arriving at the end of a unit power supply section, the carrier rides over a microgap and transferred to an adjacent unit power supply section. The carrier 1 is transferred in one direction at a constant speed while keeping a predetermined interval and when the speed of one carrier drops due to some cause and a following carrier 1 enters into the adjacent unit power supply section, a controller 6 decreases the output current from an inverter 5 in the unit power supply section where the following carrier is present to lower the transferring speed of the following carrier thus preventing two carriers 1 from entering into one unit power supply section simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless power transfer system for supplying electric power to a carrier traveling a very long distance in a contactless manner by using a high frequency constant current power supply system.

[0002]

2. Description of the Related Art Conventionally, there has been known a contactless power feeding carrier system which drives a carrier vehicle by contactlessly supplying electric power to a carrier vehicle moving on a track in a factory or the like by using a high frequency constant current power feeding method. ing. The power feeding method is that high-frequency constant currents of opposite directions are made to flow in two parallel power feeding lines provided along the track, and the power feeding lines are placed in the two openings of the E-shaped core provided in the carrier. The motor for driving the carrier is connected to the secondary winding wound around the E-shaped core.
However, in such a case, since the high frequency impedance increases as the length of the power supply line increases, it is practically impossible to make the total length of the power supply line too long, and it is attempted to simultaneously drive two or more transport vehicles on the same track. Then, since it is necessary to proportionally increase the current flowing through the power supply line, a high rated inverter for a high frequency constant current power supply is required, which makes it difficult to design at the current technological stage.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to remedy the drawbacks of the above-mentioned conventional apparatus, in which no matter how long the track is, a high frequency constant current power supply with a small rating can be used to power the vehicle without contact. It is an object of the present invention to provide a contactless power feeding transfer system capable of supplying power.

[0004]

In order to solve the above-mentioned problems, a contactless power feeding and conveying system of the present invention has a loop-shaped power feeding line whose both ends are connected to a high frequency constant current power source, with a predetermined distance between the forward and backward paths. In parallel with each other, a plurality of unit feeding sections arranged in parallel are installed in series with a small gap between each other and driven by a motor connected to the secondary winding of the E-shaped core At least one transport vehicle moving along the path is provided, and the forward and return paths of the power supply line are
It is arranged so as to be located in each of the two openings of the V-shaped core.

[0005]

The transport vehicle moves while being supplied with power to the motor from the power supply lines respectively located in the two openings of the E-shaped core, and when reaching the end of the unit power supply section, it crosses the minute gap and is adjacent to the unit power supply section. Similarly, the electric power is moved through the E-shaped core in the same manner, and while repeating this operation, the plural unit electric power supply sections installed in series are moved one after another.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the contactless power transfer system of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of the entire system, and FIG. 2 is an explanatory diagram of a carrier vehicle. A plurality of (for example, three) carrier vehicles 1 are movably supported on a circulation type track (not shown) provided on a wall, a ceiling, a floor, etc., and each carrier vehicle 1 is identical by a built-in motor 2. It is designed to be driven in the direction. Each carrier 1
Is equipped with an E-shaped core 3 for power transfer, and the motor 2 is connected to its secondary winding. Two wires 4 along the orbit
A power supply line 4 in which a and 4b are arranged in parallel is provided over the entire section of the track, and two power supply lines 4a and 4b are respectively located in the two openings of the E-shaped core 3 of the transport vehicle. Has been done.

Power supply line 4 for all sections provided along the track
Is configured by arranging a large number of unit power feeding sections having a predetermined length (for example, 5 m) in series, and a minute gap is provided between the unit power feeding sections adjacent to each other. The power supply lines 4a and 4b in each unit power supply section are connected to each other at their tips 4c to form a loop, and their base ends are connected to an inverter 5 which is a high-frequency constant current power source, whereby the forward paths are arranged in parallel. Currents in opposite directions flow in the 4a and the return path 4b. The connecting portion at the tips of the power supply lines 4a and 4b is set back from the reciprocating path so that the center pole of the E-shaped core 3 does not come into contact with the carrier 1 when passing through this portion. The inverter 5 outputs (for example) a high frequency constant current of 65 kHz and 10 A and supplies it to the power supply lines 4a and 4b, and the secondary winding 3a of the E-shaped core 3 of each carrier 1 has a value determined by its winding ratio. (For example, 1 turn for 10 turns
Current) is output and supplied to the motor 2.

Inverter 5 for all unit power supply sections
Is controlled by one controller 6 provided with a position detection means (not shown) of the carrier vehicle 1, and operates at the rated output only when the carrier vehicle 1 is present in the unit power feeding section, When it is not present, it either shuts down or operates at low power. It is controlled so that only one carrier exists in one unit power supply section. Therefore, if it is necessary to slow down the moving speed of the subsequent carrier 1, the output current value of the inverter 5 in the corresponding unit power supply section. Is controlled to decrease. In order to prevent the output waveform of the E-shaped core 3 from being disturbed when passing through the boundary between the adjacent unit feeding sections, all the inverters 5 are driven by the excitation signal of one oscillator built in the control device 6. .

Next, the operation will be described. Each carrier 1 has feeder lines 4a, 4b in the two openings of the E-shaped core 3.
, While moving while being fed with power, and when reaching the end of the unit feeding section, the unit moves to the adjacent unit feeding section over the minute gap, and also in this section through the E-shaped core 3 as well. It moves while being supplied with power, and while repeating such an operation, it moves one by one in the unit power supply sections installed in series. The three guided vehicles 1 move in the same direction at the same speed while keeping a predetermined interval, but when one vehicle slows down due to some circumstances and the succeeding guided vehicle 1 enters the adjacent unit power feeding section, control is performed. The device 6 reduces the output current value of the inverter 5 in the unit power feeding section where the following vehicle is present to delay the moving speed of the following vehicle so that the two carrier vehicles 1 do not enter the same unit power feeding section at the same time. To control.

FIG. 3 shows a power supply line in one unit power supply section of the second embodiment. Each of the forward path 4a and the return path 4b of the power supply line is composed of two conducting wires, and two sets of the forward path and the returning path lead ends 4c are connected to each other, and one set of the outgoing path and the returning path base end 4d. Are connected to each other, and the power supply line 4 forms a loop of two turns as a whole. The base ends of the other pair of conductors are connected to the inverter 5 having the same standard as that of the first embodiment. If all other configurations are the same as those in the first embodiment, the output current value of the E-shaped core 3 can be doubled without increasing the output current value of the inverter 5, and the motor having a rating twice as large. It is possible to drive a transport vehicle equipped with.
In addition, if the vehicle uses the same motor 2 as in the first embodiment, two vehicle 1 can be simultaneously operated in the same unit power feeding section.
It becomes possible to run.

By increasing the number of conductors on the outward path 4a and the return path 4b of the power supply line 4 to increase the number of turns of the loop, the output current value of the E-shaped core 3 can be increased by an amount corresponding to the number of turns. Therefore, it is possible to drive a heavier transport vehicle or to drive multiple transport vehicles in the same unit power feeding section at the same time. In addition, an inverter with a small output current can be used, which facilitates the design of the inverter.

In the above embodiment, the frequency of the output current of the inverter is set to 65 kHz, but the frequency is not limited to this, influences on other devices, ease of designing the E-shaped core, and unit power feeding. 1 considering the length of the section
It can be set appropriately in the range of about ~ 100 kHz,
Further, the output current value of the inverter and the number of turns of the secondary winding of the E-shaped core can be appropriately set according to the rating of the drive motor of the transport vehicle. Further, in the above-described embodiment, the track is of a circulating type so that all the vehicles move in the same direction, but it is not always necessary to do so. Further, it is needless to say that it is not necessary to control the inverter to operate at the rated output only when the transport vehicle is present in the unit power feeding section, and it is also possible to always operate at the rated output.

[0013]

As described above, in the contactless power feeding carrier system of the present invention, a high frequency constant current feeding system is used for a carrier vehicle that moves a very long distance by installing a large number of unit power feeding sections in series. It is possible to supply electric power in a contactless manner, and by using a large number of high-frequency constant-current power supplies with a small rating for supplying power to one unit power supply section, it is possible to supply power reasonably over an infinitely long power supply section. Play.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an entire contactless power transfer system according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of the carrier vehicle.

FIG. 3 is a schematic diagram of a power supply line in a unit power supply section of the second embodiment.

[Explanation of symbols]

1 Carrier 2 Motor 3 E-shaped core 3a Secondary winding 4 Feed line 4a Forward 4b Return 5 Inverter 6 Controller

Claims (1)

[Claims] 1. A plurality of unit power feeding sections in which a forward path and a return path of a loop-shaped power feeding line whose both ends are connected to a high frequency constant current power source are arranged in parallel at a predetermined interval with a minute gap therebetween. At least one carrier, which is installed in series and is driven by a motor connected to the secondary winding of the E-shaped core and moves along the plurality of unit power feeding sections, is provided with forward and backward paths of the power feeding line. A contactless power transfer system characterized by being arranged so as to be respectively located in two openings of an E-shaped core.