JPH08308150A - Noncontact power distribution system - Google Patents

Abstract

PURPOSE: To always apply a constant voltage to other loads being driven even when part of a plurality of loads fluctuates by supplying a constant current to the feeder lines from a power source section and, at the same time, providing a constant-current circuit section and constant-voltage converting section between pickup sections which are inductively coupled with the feeder lines and the loads. CONSTITUTION: In a monorail type carrying system which drives a plurality of carriers 2, a prescribed high-frequency sine-wave constant current is supplied to feeder lines 12d and 12e from a power source section. In each carrier 2, a pickup resonating circuit 51 changes the electric power induced in a pickup coil 24g to a constant current and an impedance converting section 52 converts the constant current into a constant voltage and supplies the constant voltage to a motor M through a full-wave rectifying circuit 53 and smoothing circuit section 54. Even when the load of one motor M fluctuates, theretore, the influence of the fluctuation on the driving state of other motors M being driven can be prevented by always applying constant voltages across the other motors M.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pickups which are inductively coupled to a load such as a motor of a plurality of transport vehicles from a power supply line connected to a power source in a physically non-contact state with the power supply lines. The present invention relates to a contactless power distribution system that distributes and supplies power via each unit.

[0002]

2. Description of the Related Art FIG. 10 is a front view showing the relationship between a guide rail and a carrier in a conventional monorail type carrier facility,
FIG. 11 is an enlarged cross-sectional view showing the relationship between the power supply line provided on the guide rail and the pickup section provided on the transport vehicle. In the figure, 1 denotes the guide rail and 2 denotes the transport vehicle.

The guide rail 1 is formed to have an I-shaped cross section, and is installed in a state of being suspended from the ceiling or the like of a factory by support arms 11 mounted along its one side in the longitudinal direction at substantially regular intervals. A guide line 12 is fixed to the other side surface of the guide rail 1 and extends in the longitudinal direction thereof.

On the other hand, the carrier 2 is arranged in front of and behind the traveling direction of the carrier 2 at a predetermined interval, and the guide rail 1 is seen in a front view.
The carrier 23 is arranged to pass over a pair of U-shaped body frames 21 (only one side of which is shown in FIG. 10) for holding the carrier 23 so that a carrier (not shown) is detachably supported. It has become.

A drive trolley 21a is provided on the body frame 21 at a position facing the upper end surface of the guide rail 1 and rollingly contacts the upper end surface.
However, at a position facing both side surfaces of the lower end of the guide rail 1,
A pair of steady rest rollers 21b, 21 rolling on this side surface
b, and a pickup section 24 at a position facing the guide line 12, the drive trolley 21a on the upper end surface of the guide rail 1, and the steady rest rollers 21b, 2b.
The guide rails 1b are mounted on the guide rails 1 in such a manner that they are in rolling contact with both side surfaces of the lower end of the guide rails 1 and the pickup portion 24 faces the guide line 12.

Above the body frame 21, the drive trolley 21 is provided.
A motor M that is connected to a is mounted, drives the control unit and the motor M (not shown) by the electric power supplied through the pickup unit 24, rotates the drive trolley 21a, and moves the carrier 2 along the guide rail 1. It is designed to drive. As shown in FIG. 11, the guide line 12 includes two supporters 12 protruding laterally at a predetermined distance above and below a mounting plate 12a fixed to the other side surface of the guide rail 1.
One line is stretched in a loop at each tip of b and 12c. A line on one side of the induction line 12 stretched in a loop is referred to as a power supply line 12d, and a line on the other side is referred to as a power supply line 12e. On the other hand, the pickup unit 24 has a pickup core 24a formed in an E-shaped cross section, and a pickup coil 24g is wound around the central protrusion 24d among the plate-shaped protrusions 24b, 24c, and 24d provided at the upper, lower, and central portions thereof. I am doing it.

FIG. 12 is an electric circuit diagram of the monorail type transportation facility. The power supply side is provided with a three-phase AC power source 71, a converter 72, a sine wave resonance inverter 73 and the like. The converter 72 is a set of two for full-wave rectification 3
A pair of diodes 72a, a coil 72b, a capacitor 72c and a resistor 72d which form a low pulse filter,
The transistor 72e short-circuits the resistor 72d. Further, the sine wave resonance inverter 73 is driven alternately with transistors 73a and 73b, a current limiting coil 73d, a current supplying coil 73f connected to the transistors 73a and 73b, and power supply lines 12d and 12b.
and a capacitor 73c forming a parallel resonance circuit together with e.

On the other hand, the power receiving side has a pickup coil 24g.
A rectifier 82 formed of a diode in a resonance circuit composed of a capacitor 81 and a capacitor 81, a stabilizing power supply circuit 83 for controlling the output of the rectifier 82 to a predetermined voltage, and an inverter 84 are connected to a motor M for driving the transport vehicle 2. I am doing it. The stabilized power supply circuit 83 includes a current limiting coil 83a, an output adjusting transistor 83b, and a capacitor 83d.

In such a conventional device, the ACV three-phase AC output from the AC power supply 71 is converted into DC by the converter 72, and the sine wave resonance inverter 7 is further used.
3 converts the sine wave having a high frequency, for example, 10 KHz, and supplies the sine wave to the power supply lines 12d and 12e. Power supply line 12
By feeding power to d and 12e, a magnetic field is formed around them, and a large electromotive force is generated in the pickup coil 24g that resonates at the frequency of the power supply lines 12d and 12e. The generated alternating current is rectified by the rectifier 82 and the inverter At 84, it is converted into alternating current and supplied to the motor M, and the transport vehicle 2 travels along the guide rail 1.

By the way, when a plurality of loads are driven by the inductive coupling as described above, that is, so-called series load driving, when one load is in an open state or a state close to this, all the voltages supplied to the power supply line are concerned. Since the load is added to the pickup unit 24, there is a problem that the power supply to other loads being driven is adversely affected. Conventionally, as a countermeasure against this, a method (USP4914539, USP48) using a regulator circuit (for example, a shunt regulator or a ferro-resonant transformer) for always maintaining a constant output voltage to the power receiving side regardless of fluctuations in load.
33338, USP390454), a method of coupling or decoupling a pickup unit and a power supply line for power adjustment (Patent Table 6-
No. 5,060,993, Japanese Patent Laid-Open No. 55-119393), a method of preventing the load itself from being opened (Japanese Patent Laid-Open No. 2-215087), and the like.

Among these, the following three methods are disclosed in Japanese Patent Publication No. 6-506099 as a method for coupling or decoupling the pickup section and the power supply line described above. (A) A method of physically moving the pickup coil with respect to the power supply line (b) A separation coil is wound around the pickup coil, and a switch for switching the separation coil between an open circuit and a short circuit is provided. A method of changing the power exchanged between the power supply line and the pickup coil by switching the switch. (C) A capacitor, an inductor, and a switch connected in series with the capacitor. There is disclosed a method of varying the electric power exchanged between the feeder line and the pickup coil by switching the circuit consisting of the pickup resonance circuit and the open circuit.

[0012]

By the way, in the case of the method (a), a means for moving the pickup coil and a space for moving the pickup coil are required, which is inevitably increased in size and cost, and the pickup coil is inevitable. Since it has a movable structure, it requires maintenance and inspection, and has a problem of low reliability. Further, in the case of the method of switching the isolation coil as the second winding of (b) and the method of turning on / off the pickup resonance circuit of (c), both are equipped with a switch.
Since all of them are switches as active elements, there is a problem that load fluctuations and frequency fluctuations of the power feeding section occur, and in particular, the contact type has a problem that noise cannot be avoided.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate a switch as an active element, to reduce load fluctuation and frequency fluctuation of a power feeding section, and to prevent an influence of noise. It is to provide a non-contact power distribution system that achieves high reliability.

[0014]

A contactless power supply system according to the present invention provides a power supply line connected to a power source to a plurality of loads via a plurality of pickup units inductively coupled to the power supply line. In a non-contact power distribution system for distributing power, a constant current circuit unit that supplies a constant current to the power supply line, and a constant current from the electric power induced in each pickup unit, which is provided between each pickup unit and a load. And a constant voltage conversion unit for converting a constant current from the constant current circuit unit into a constant voltage and applying the constant voltage to a load.

[0015]

According to the present invention, a constant current is supplied to the power supply line from the constant current circuit unit, and on the other hand, the constant current circuit unit and the constant voltage are also provided between each pickup and the load which are inductively coupled to the power supply line. By including the converter, one of the loads to be supplied with power is in an open state or a state close to this, and the entire voltage of the power supply line is not applied to the load, which adversely affects other loads. Is prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. 1 is a schematic diagram showing a monorail type transport system to which the present invention is applied, FIG. 2 is a perspective view showing the relationship between a guide rail and a transport vehicle, FIG. 3 is a front view of the same, and FIG. 4 is a feeder line and a pickup unit. 3 is an enlarged cross-sectional view showing the inductive coupling structure of FIG. In the figure, 1 is a guide rail that constitutes a monorail type transportation system in a factory, 2 is a guided vehicle, and 3 is a system controller. The guide rail 1 is laid so as to form multiple loops by connecting stations (not shown) corresponding to the purpose of transportation, and a switch for selectively using one of them at each intersection.
A rail type branching / merging unit 4 is provided.

The guide rail 1 has a substantially I-shaped cross section, and one side surface thereof is provided with support arms 11 at substantially constant intervals in the longitudinal direction as shown in FIG. It is installed suspended from the ceiling. A guide line 12 is fixed to the other side surface of the guide rail 1 over the same entire length in the longitudinal direction, and is connected to the primary side power supply unit 7 shown in FIG.

The guide line 12 is, as shown in FIG. 4, a pair of supporters 12b projecting laterally at a predetermined interval upward and downward from one side surface of a mounting plate 12a screwed to the other side surface of the guide rail 1. , 12c, each of which is provided with a line extending in a loop shape. One side of the line stretched in a loop is referred to as a power supply line 12d, and the other side is referred to as a power supply line 12e. The power supply lines 12d and 12e are configured by covering an electric wire made of a stranded wire formed by bundling insulated thin wires with a resin material. On the other hand, as shown in FIGS. 2 and 3, the transport vehicle 2 is a carrier 23 that detachably mounts the transported object G by passing it over a pair of front and rear body frames 21 and 22 which are U-shaped in a front view.
It is configured by suspending.

The vehicle body frame 21 has an upper portion thereof, a drive trolley 21a rollingly contacting the upper surface of the guide rail 1 at a position facing the upper surface of the guide rail 1, and upper and lower portions thereof having the guide rail 1.
A pair of steady rest rollers 21b and 21c that are in rolling contact with the upper and lower both side surfaces are provided respectively, and a motor M linked to the drive trolley 21a is fixed to the upper portion. Further, pickup portions 24 are provided on the sides of the body rail 21 of the guide rail 1 that face the power supply lines 12d and 12e, respectively.

As shown in FIG. 4, the pickup portion 24 has upper and lower protrusions 24b, 24 in a pickup core 24a made of a magnetic material such as ferrite and formed in an E-shaped cross section.
c, the back portions 24e, 24f connecting the central protrusions 24d,
In other words, the pickup coil 24g is wound around the inner back wall of each recess facing the power supply lines 12d and 12e. The number of turns, wire diameter, etc. of the pickup coil 24g are set as necessary. This pickup coil 2
4g faces the peripheral surfaces of the power supply lines 12d and 12e at a predetermined distance when the carrier 2 is mounted on the guide rail 1 and is formed around the power supply lines 12d and 12e by energization. By being located in the magnetic field, the electric power induced in the pickup coil 24g is supplied to the motor M. On the other hand, on the body frame 22, there is a driven trolley 22a that rolls on the upper portion of the body frame 22 facing the upper surface of the guide rail 1, and on the lower portion of the body frame 22 facing the lower both side surfaces of the guide rail 1. A steady roller (not shown) for rolling contact is provided.

The system controller 3 is for carrying out the control necessary for the transport vehicle to transport the transported object G from one station to another intended station, such as loading and unloading of the transport vehicle. In addition to giving work instructions, it outputs a control signal for securing a travel route, and gives a work instruction for transferring the transported object G to a station controller (not shown) installed in each station. In addition to controlling the operation of the entire system and ensuring safety, it also has the function of issuing an alarm when a failure occurs.

The branching / merging controller 5 is for controlling traffic between the plurality of vehicles 2 and is installed at a place where traffic control is required, for example, a branching section, a merging section or the like. The other 6 is a repair line, and this repair line 6 branches the vehicle 2 requiring maintenance and inspection, and joins and joins the transport vehicle 2.
It is for guiding from the guide rail 1 to this place via the to perform maintenance.

FIG. 5 is a block diagram showing a schematic structure of a power supply / power receiving structure between the guide rail 1 and the carrier vehicle 2 in the monorail system carrier system shown in FIG. The power supply unit 7 is installed on the ground together with the system controller 3 and the like, and supplies high-frequency constant current to the power supply lines 12d and 12e that form the induction line 12. The pickup unit 24 receives electric power from the power supply lines 12d and 12e by inductive coupling and supplies electric power to the motors and the like of the transport vehicles 2 via the power receiving unit 8.

FIG. 6 is a circuit diagram showing a specific configuration of the power supply section 7 shown in FIG. 5, which is configured as a thyristor bridge by combining six thyristors and rectifies commercial three-phase alternating current to obtain a direct current voltage. Unit 41, a capacitor 42 for smoothing the output of the rectifying unit 41, an inverter conversion unit 43 configured to combine four power transistors in a bridge to switch a DC voltage and generate a high frequency voltage of a predetermined frequency, impedance matching And an impedance matching transformer unit 44 for performing isolation (floating), a rectifying unit gate unit 45 for controlling the rectifying unit 41, a high frequency gate unit 46 for controlling the inverter converting unit 43, and the like.

Impedance matching transformer section 44
The both ends on the secondary side of are connected to the above-described power supply lines 12d and 12e via the resonance capacitor CR. Rectifier gate unit 45 is 3-phase AC power supply lines R, S, is connected to a T, respectively, are connected to the current detector CT ₃ provided in the feed line 12e, detected by said current detector CT ₃ A fixed frequency sinusoidal constant current is supplied to the power supply lines 12d and 12e by outputting a control signal to the gate terminals G _{1 to} G ₆ of each thyristor to adjust the DC voltage based on the generated current and performing feedback control of the thyristor. .

FIG. 7 shows a power receiving section 8 mounted on the carrier vehicle 2.
It is an electric circuit diagram showing the configuration of the feeder line 12d, 12e
On the other hand, the pickup units 24 of the plurality of transport vehicles 2 are inductively coupled. The configurations of the transport vehicles 2 are substantially the same, and one of them will be described. The power reception unit 8 receives the electric power induced in the pickup unit 24 from the magnetic field formed around the power supply lines 12d and 12e by energization, and functions as a constant current circuit unit. The pickup resonance circuit unit 51 and the constant current circuit unit. The impedance conversion unit 52 that converts the constant current that is the output of the above into a constant voltage, the full-wave rectification unit 53 that converts the high frequency constant voltage source into the direct current, the smoothing circuit unit 54, and the like.

The smoothing circuit section 54 includes a choke coil 54a,
It is composed of a capacitor 54b and a bleeder resistor 54c. The configurations of the other power receiving units 8 are substantially the same, and corresponding parts are designated by the same reference numerals and the description thereof is omitted.

Next, the operation of the contactless power feeding system according to the present invention will be described. The power supplied from the three-phase AC power supply through the power supply lines R, S, T is rectified by the rectification unit 41 and converted into a predetermined DC voltage corresponding to this power, and then the inverter circuit unit 43 outputs a predetermined high frequency. Feed line 1 as a sine wave constant current of
Power is supplied to 2d and 12e. On the other hand, the pickup section 24 gives the electric power induced in the pickup coil 24g in the magnetic field to the impedance conversion section 52 as a constant current in the pickup resonance circuit section 51. The impedance converter 52 converts a constant current into a constant voltage, and a full-wave rectifier circuit 53.
And the high frequency constant voltage is converted to direct current by the smoothing circuit section 54,
Supply to the motor M etc. As a result, even if the load of the motor M changes, a constant voltage is always applied to the other driving motor M, and the load fluctuation of the one motor M causes the other driving motor M to change.
It does not affect the drive state of.

FIG. 8A shows the power supply line 12d in FIG.
12e is an explanatory view showing the relationship between the pickup resonance circuit section 51 and the pickup resonance circuit section 51, which is modeled as shown in FIG. 8 (b). In FIG. 8B, ω (L ₁ + L ₃ ) = 1 /
If the resonance capacitor 51a is selected so as to be ωC _P , the relationship of the following formula (1) is established between the voltages V ₁ and V ₃ .

[0030]

[Equation 1]

From the equation (1), I ₃ and I ₁ , and V ₁ and V ₃ can be expressed as the following equations (2) and (3).

[0032]

[Equation 2]

In the equation (2), since I ₁ is a constant current, I ₃ = constant, and the pickup resonance circuit section 51 composed of L _P and C _P functions as a constant current source. FIG. 8C shows the equivalent circuit of FIG. 8B.

FIG. 9 is an explanatory view of the impedance converter, the voltage V ₃ across the capacitor C _11, also the current I ₃ is applied, the voltage V ₅ current I ₅ is applied to both ends of the capacitor C ₁₂ , ΩL _I = 1 / ωC ₁₂ , and C ₁₁ = C ₁₂
When selecting the capacitor C _11, C ₁₂ such that V _3,
The relationship shown in the following equation (4) is established between I ₃ and I ₅ .

[0035]

(Equation 3)

From now on, V ₃ and V ₅ are as follows (5),
It can be expressed as in equation (6). V ₃ = jωL ₁ · I ₅ (5)

[0037]

[Equation 4]

As described above, since I ₃ = constant, V ₅ =
It becomes constant, and the output of this impedance converter becomes a constant voltage. That is, a constant voltage is applied to each motor M regardless of its load. Even if one of the plurality of transport vehicles 2 is in the open state, that is, I ₅ = 0 by stopping, the voltage applied to the power supply line of the pickup unit 24 is V ₃ according to the equation (5). = 0, and a constant current is given to the impedance converting unit 52 through the pickup resonance circuit unit 51 to the other driving vehicle 2 that is being driven, where it is converted into a constant voltage and supplied to the other driving motor M. This means that stopping one transport vehicle does not adversely affect the driving states of other transport vehicles.

[0039]

As described above, in the non-contact power distribution system according to the present invention, a constant current circuit unit for supplying a constant current to the power supply line, and a pickup unit is induced between the pickup unit and the load. Since a constant current circuit unit that obtains a constant current from the electric power and a conversion unit that converts the constant current from the constant current circuit unit to a constant voltage and applies the same to the load are provided, one of the plurality of loads is Even if it fluctuates, it is prevented that a constant voltage is always applied to the other driving loads to affect the driving,
It has an excellent effect of maintaining stable driving of the load.

[Brief description of drawings]

FIG. 1 is a schematic view of a monorail type transportation facility to which a contactless power distribution system according to the present invention is applied.

FIG. 2 is an enlarged side view showing a relationship between a guide rail and a guided vehicle in a monorail type carrying system.

FIG. 3 is an enlarged front view showing a relationship between a guide rail and a traveling carriage.

FIG. 4 is a schematic view showing a relationship between a guide rail of a guide rail and a pickup section of a traveling vehicle.

FIG. 5 is a block diagram showing power supply equipment.

FIG. 6 is a circuit diagram showing details of a power supply unit.

FIG. 7 is a circuit diagram showing details of a power receiving unit.

FIG. 8 is an explanatory diagram of a feeder line and a pickup resonance circuit section.

FIG. 9 is an explanatory diagram of an impedance conversion unit.

FIG. 10 is a front view showing a relationship between a guide rail and a traveling carriage in a conventional system.

FIG. 11 is a schematic cross-sectional view showing a relationship between a power supply line and a pickup unit in a conventional system.

FIG. 12 is an electric circuit diagram of each of a power feeding unit and a power receiving unit of a conventional system.

[Explanation of symbols]

 1 guide rail 2 carrier vehicle 3 system controller 4 branching / merging unit 5 branching / merging controller 6 repair line 11 support arm 12 guide line 21,22 body frame 24 pickup unit 24g pickup coil 41 rectification unit 42 capacitor 43 inverter conversion unit 44 impedance Matching transformer section 45 Rectification section gate unit 46 High frequency gate unit 51 Pickup resonance circuit section 52 Impedance conversion section 53 Full wave rectification circuit section 54 Smoothing circuit section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Kawamatsu 4-17-96 Tsurumi, Tsurumi-ku, Osaka-shi, Osaka Prefecture Tsubakimoto Chain Co., Ltd.

Claims (1)

[Claims] 1. A power supply line connected to a power supply via a plurality of pickup units inductively coupled to the power supply line,
In a non-contact power distribution system that distributes power to each of a plurality of loads, a constant current circuit unit that supplies a constant current to the power supply line is provided between each pickup unit and a load, and is induced in each pickup unit. A non-contact power distribution system, comprising: a constant current circuit section for obtaining a constant current from a constant power; and a constant voltage conversion section for converting a constant current from the constant current circuit section into a constant voltage and applying it to a load. .