JP4573395B2 - Elevator power feeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevator power supply apparatus that supplies electric power to an elevator car having a long up-and-down stroke and peripheral equipment of the car.
[0002]
[Prior art]
As shown in FIG. 8, the conventional elevator employs a structure in which an elevator cable is used between the elevator controller and the car to supply power to the car.
[0003]
[Problems to be solved by the invention]
However, in an elevator with a long up-and-down stroke, the resistance of this cable increases in proportion to the length of the elevator cable, so that the voltage drop due to energization also increases. In order to suppress the voltage drop due to the energization, it is necessary to keep the resistance value low, and for this purpose, it is necessary to increase the cross-sectional area of the cable. In order to realize this, for example, a large number of wire cores are required, and accordingly, the cable becomes large and heavy, so that there is a limit to the elevator up / down stroke. In addition, the cable is liable to be twisted, resulting in a problem that not only the dynamic characteristics during raising and lowering are deteriorated, but also the equipment is damaged due to a collision of the car.
In order to solve such problems, Japanese Patent Application Laid-Open No. 5-294568 has proposed a method in which power is supplied by a generator or a storage battery during traveling and non-contact power is supplied during a stop. In this method, all stop floors are proposed. There is a problem that the power supply apparatus must be installed in the apparatus, resulting in high cost.
[0004]
In addition, as shown in FIG. 9, in an inclined elevator with an inclination, an elevator cable for supplying electric power to a car is suspended and expanded like a curtain, or moved on a roller with the cable lying down. However, when the elevator cable contracts, it is folded like a curtain, so that the cable is locally subjected to extreme bending stress. For this reason, there was a problem that the inner conductor of the cable was disconnected early.
[0005]
Japanese Patent Application Laid-Open No. 6-135658 proposes a method of supplying power by a trolley. However, in this method, the trolley wire and the current collector are worn by contact, so that periodic inspection and replacement are necessary. Therefore, there is a problem that there is a risk of generation of sliding noise and electric shock.
[0006]
As a method of solving the above problems, there is a method of taking out current from the induction wire without using an elevator cable at all times, but the elevator shakes the car due to ups and downs or earthquakes. It is necessary to increase the gap between the installed power receiving coil and the induction wire laid in the hoistway, and in this case, there is a problem that the power transmission efficiency is lowered.
[0007]
In addition, since the receiving coil that takes out current from the induction line in a non-contact manner generates heat due to the current flowing through the winding, in order to receive a large current, the heating value is increased by increasing the wire diameter of the winding and reducing the resistance value. It was necessary to suppress.
However, in such a configuration, there is a problem that the power receiving coil becomes large and a large installation space is required.
[0008]
In addition, the power received from the induction line is available for car lighting, display, etc. that are always used, and the cage door drive device that uses relatively large power temporarily. It was necessary to increase the current and make the receiving coil a large capacity type. However, such a configuration of the power supply apparatus has a problem that the primary side power supply apparatus and the power receiving coil are also enlarged and a large installation space is required.
[0009]
The present invention has been made to solve the above-described problems. A small elevator power supply apparatus that can supply power to an elevator car without using an elevator cable that easily generates the above-described problems and suppresses heat generation at low cost. The purpose is to provide.
[0010]
[Means for Solving the Problems]
An elevator power feeder according to a first aspect of the present invention is an electric power supply means for supplying a current that varies with time, and is laid on the left side of the elevator car substantially in parallel with the moving direction of the car, and the electric current is supplied from the electric power supply means. A first induction wire that receives and flows, and a second induction that is laid on the right side of the cage substantially in parallel with the direction of movement of the cage and receives a current in phase with the current flowing from the power supply means to the first induction wire. A first gap is formed on the left side of the car by forming a gap between the first lead wire and the first lead wire on the car side from the first lead wire, and a current is extracted from the first lead wire by electromagnetic induction . A gap is formed between the power receiving coil and the second induction wire on the car side of the second induction wire and is attached to the right side of the cage, and a current is extracted from the second induction wire by electromagnetic induction. 2 power receiving coils and the first and second Each took out current of the second power receiving coil by synthesizing, in which a synthesizing means for keeping the current supplied to the car fixed.
[0011]
The elevator power supply apparatus according to the second aspect of the present invention is a power supply means for supplying a current that changes with time , and is laid on the front side of the elevator car substantially in parallel with the moving direction of the car. A first induction wire that receives and flows current, and is laid on the rear side of the cage in parallel with the moving direction of the cage, and receives and flows a current in phase with the current flowing from the power supply means to the first induction wire. A gap is formed between the second guide wire and the first guide wire on the car side from the first guide wire, and is attached to the front side of the car. A current is generated from the first guide wire by electromagnetic induction. A gap is formed between the first receiving coil to be taken out and the second induction wire on the car side from the second induction wire, and is attached to the rear side of the cage, and electromagnetic induction from the second induction wire is performed. A second power receiving coil for extracting current; The current each of the serial first and second receiving coil is taken out and synthesized, in which a synthesizing means for keeping the current supplied to the car fixed.
[0012]
The elevator power feeder according to the third aspect of the invention is configured such that the first guide wire is laid in the vicinity of one of the guide rails for guiding the elevator car, and the second guide wire is laid in the vicinity of the other of the guide rails. one in which the.
[0014]
In the elevator power feeder according to the fourth aspect of the invention, the current that changes with time is a sine wave current.
[0015]
In the elevator power feeder according to the fifth aspect of the invention, the current that changes with time is a triangular wave current.
[0016]
Moreover, the elevator electric power feeder which concerns on 6th invention is made into the shape which increased the surface area of the magnetic body of the receiving coil which takes out an electric current from an induction wire by electromagnetic induction.
[0017]
Moreover, the elevator electric power feeder which concerns on 7th invention installs the electric power supply battery for elevator car door drive devices in a cage | basket | car.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram of an elevator apparatus for raising / lowering including an elevator power supply apparatus according to the present invention. FIG. 3 is a block diagram showing an elevator power feeder. In FIG. 1, a primary power supply device 4 of an elevator machine room corresponds to the power supply means shown in claims 1, 3, and 4, and starts from the primary power supply device 4 with an induction wire 5 as an elevator hoistway 1. The power receiving unit 6 was attached to the car 2. As shown in FIG. 3, the guide wire 5 is mounted in the vicinity of the guide rail 9 using a mounting bracket 15, and as shown in FIG. 4, the end (on the opposite side to the temporary power supply device 4 (upper left portion in FIG. 4)) The lower left part of FIG. 4 electrically constitutes a loop. Although not shown in FIGS. 1 and 2, the voltage control device 10 is attached to the upper portion of the elevator car 2. As shown in FIG. 3, power receiving coils 11a and 11b are housed inside the power receiving unit 6, and the power receiving coils 11a and 11b are attached so that the guide wires 5a and 5b are located at the center.
[0019]
When a sinusoidal current is supplied to the induction wire 5 from the primary power supply device 4, the magnetic flux density around the induction wires 5a and 5b (including the magnetic bodies in the reception coils 11a and 11b) changes. A counter electromotive force is generated in the direction of preventing the change in 11b. This back electromotive force is sent to the voltage control apparatus 10. Here, the magnetic bodies of the power receiving coils 11a and 11b have fin shapes with good heat dissipation as shown in FIG. 5, and have an effect of suppressing temperature rise due to heat generated by the power receiving coils 11a and 11b.
[0020]
FIG. 4 shows a circuit configuration of the power feeding apparatus, in which the same reference numerals as those in FIG. 1 denote the same or corresponding parts. The voltage (back electromotive force) generated by the power receiving coils 11a and 11b in the power receiving unit 6 is rectified and smoothed by the diode 101 and the smoothing capacitor 102 in the voltage control device 10 and converted from an AC voltage to a DC voltage. Further, the voltage converted to DC is converted into an AC voltage of commercial frequency by the inverter 103, converted to a predetermined voltage by the transformer 104, and then constantly supplied to the car lighting device 8 and the car door driving device 7. Here, the car door driving device 7 is a door control circuit 71, a battery 72, a charging circuit 73 that charges the battery, a booster circuit 74 that boosts the battery voltage, and a switching that is turned on when the door motor is rotated (opens and closes the door). The switch 75 is configured to supply power to the door control circuit 71 and the battery charging circuit 73 from the voltage control device 10.
[0021]
The configuration described above has the following merits: (1) It is possible to always supply power to the car without contact without an elevator cable, and periodic inspection and replacement are not required.
(2) By laying the guide wire 5 in the vicinity of the guide rail 15 with the least displacement of the elevator car 2, the gap between the power receiving coil 11 and the guide wire 5 can be minimized and the power transmission efficiency can be increased.
(3) By making the magnetic body of the receiving coil 11 into a fin shape with good heat dissipation, temperature rise due to heat generation of the receiving coil 11 can be suppressed, and large power can be received without enlarging the receiving coil.
(4) Since the car door drive power, which requires a relatively large amount of power temporarily, is supplied from the battery installed in the car, the power received from the induction line can be reduced. The primary power supply capacity and receiving coil can be reduced in size.
(5) The battery can also be used as a door drive power supply during a power failure.
Of course, when the state where the elevator is not used continues, the current to the induction wire does not flow.
[0022]
FIG. 2 shows a case where the present invention is applied to a skew elevator, but the configuration of the equipment is the same as that of the embodiment in the elevator that moves in the vertical direction.
FIG. 5 shows the shape of the power receiving coil in the power receiving unit. In FIG. 5A, the winding is wound into a long shape having a concave cross section as shown in FIG. A plurality of coils in which windings are wound in a short shape with an advantageous concave section may be arranged.
Further, as shown in FIG. 5C, a coil having an E-shaped cross section may be used.
[0023]
Embodiment 2. FIG.
In the first embodiment, when the car 2 swings, the current taken out by the power receiving unit changes due to the guide wire and the power receiving coil being separated or approaching each other. Although this change can be considerably absorbed by the smoothing capacitor, it may not be sufficiently removed depending on the ability of the smoothing capacitor. Therefore, there is a problem that power reception efficiency cannot be sufficiently increased.
[0024]
Therefore, in the second embodiment, in order to solve the above-described problem, as shown in FIG. 6, the induction wires 5 for passing the sinusoidal current one by one to the left and right symmetrical positions around the central portion of the elevator car 2 are provided. A power receiving unit 6 provided with a power receiving coil that is laid substantially parallel to the moving direction of the car 2 and takes out current from the induction wire 5 by electromagnetic induction is attached to the car 2 one by one on the left and right. A sine wave current is passed from the primary power supply 4 to the left and right induction wires in phase. In this way, the currents taken out by the power receiving units 6 of the induction wires provided one by one on the left and right of the car 2 are sent to the voltage control device 10 and synthesized by the synthesis circuit 16 shown in FIG. The operation after synthesis is the same as that in the first embodiment.
[0025]
In this way, for example, when the car swings to the left, the current taken by the power receiving coil of the power receiving unit attached to the right side of the car from the right induction line is reduced by the distance that the power receiving unit is away from the right induction line. The current taken out from the left induction wire by the power reception coil of the power reception unit attached to the left side increases as the power reception unit approaches the left induction wire. Therefore, by synthesizing the current received by the right power receiving unit and the current received by the left power receiving unit, a substantially constant current can be obtained regardless of which position the car moves to the left or right.
Note that the swing of the car is based on the premise that the receiving coil is within a range where power can be received, and in the case of a larger swing, an emergency emergency stop device that is not related to the present invention is provided.
[0026]
In this way, by synthesizing the currents extracted by the guide wires provided on the left and right sides of the car, even if the car shakes, the synthesized current becomes a substantially constant value and can receive a stable power supply.
[0027]
Similarly, an induction wire 5 for passing a sinusoidal current one by one in a longitudinally symmetrical position around the center of the elevator car 2 is laid almost in parallel with the moving direction of the car 2, and electromagnetic induction is generated from the induction wire 5. Are attached to the car 2 one by one on the front and rear sides, each having a power receiving coil for taking out current. Thus, the currents taken out by the power receiving units 6 of the induction wires provided one by one before and after the car 2 are sent to the voltage control device 10 and synthesized by the synthesis circuit 16 shown in FIG. The operation after synthesis is the same as that in the first embodiment.
[0028]
Thus, by synthesizing the currents generated by the induction wires provided before and after the car, the synthesized current becomes a substantially constant value and can receive a stable power supply.
[0029]
Further, unlike the conventional example disclosed in Japanese Patent Application Laid-Open No. 5-294568, it is not necessary to provide a special device for each stop floor, so that it can be provided at a relatively low cost.
[0030]
In the above embodiment, a sine wave current is used as the current, but any current that changes with time may be used. For example, a triangular wave may be used.
[0031]
【The invention's effect】
According to the present invention, since the current is extracted from the induction wire by electromagnetic induction, the elevator cable is not necessary, and not only the problem of disconnection due to the contraction of the cable is eliminated, but also the car is not shaken due to the twisting of the cable, As a result, the device can be prevented from being damaged due to the collision of the car. Furthermore, since there is no need to provide a special device for each stop floor, there is an effect that it can be provided at a relatively low cost.
In addition, according to the present invention, the currents taken from the induction wires provided on the left and right sides of the car are combined, and the current supplied to the car is kept constant. It becomes stable and has an effect of being able to receive a stable power supply.
In addition, according to the present invention, the current taken from the induction wires provided before and after the car is synthesized, and the current supplied to the car is kept constant, so that even if the car shakes back and forth, the synthesized current is almost It becomes a constant value, and there is an effect that a stable power supply can be received.
[0032]
Further, according to the present invention, since the guide wire is laid in the vicinity of the guide rail of the elevator with the least car sway, there is an effect that the power transmission efficiency can be enhanced by minimizing the gap between the power receiving coil and the guide wire.
[0035]
In addition, according to the present invention, since the surface area of the magnetic body of the power receiving coil is increased, the temperature rise due to heat generation of the power receiving coil can be suppressed and a large amount of power can be received without enlarging the power receiving coil. Play.
[0036]
In addition, according to the present invention, since the car door driving power that requires a relatively large amount of power temporarily is supplied from the battery installed in the car, the power received from the induction line can be reduced (only the power used at all times). The primary power supply capacity and the receiving coil can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an elevator apparatus for raising and lowering including an elevator power supply apparatus according to the present invention.
FIG. 2 is a configuration diagram of a skew elevator apparatus including an elevator power supply apparatus according to the present invention.
FIG. 3 is a configuration diagram illustrating an elevator power feeder.
4 is a configuration diagram showing a circuit configuration of the elevator power supply device shown in FIG. 3; FIG.
FIG. 5 is a diagram showing an overview of a receiving coil magnetic body.
FIG. 6 is a configuration diagram showing an embodiment 2 of an elevator power supply apparatus according to the present invention.
7 is a configuration diagram showing a circuit configuration of the elevator power supply device shown in FIG. 6. FIG.
FIG. 8 is a diagram showing supply of electric power to a car using an elevator cable in a conventional lift elevator.
FIG. 9 is a diagram showing power supply to a car using an elevator cable in a conventional skew elevator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elevator hoistway, 2 cars, 3 hoisting machine, 4 primary power supply device, 5 induction wire, 6 power receiving unit, 7 car door drive device, 8 car lighting fixture, 9 guide rail, 10 voltage control apparatus, 11 receiving coil, 12 Door motor, 13 Elevator cable, 14 Elevator control device, 15 Mounting bracket, 16 Composite circuit, 71 Door control circuit, 72 Battery, 73 Battery charging circuit, 74 Booster circuit, 75 Changeover switch, 76 Inverter, 101 Diode, 102 Smoothing capacitor , 103 inverter, 104 transformer.

Claims (7)

Power supply means for supplying a current that varies with time;
Laid on the left side of the elevator car substantially parallel to the moving direction of the car, a first induction line for flowing receiving said current from said power supply means,
A second induction wire that is laid on the right side of the car substantially parallel to the moving direction of the car and receives a current in phase with the current flowing from the power supply means to the first induction wire;
It mounted on the left side of the car to form a gap between the first guide wire in the car side of the first induction line, the first power-receiving carp to take out current by an electromagnetic induction from said first induction line And
A second receiving coil that is attached to the right side of the car by forming a gap between the second induction wire and the second induction wire on the cage side, and for extracting current from the second induction wire by electromagnetic induction; ,
An elevator power supply apparatus comprising: combining means for combining the currents taken by each of the first and second power receiving coils and maintaining a constant current supplied to the car . Power supply means for supplying a current that varies with time;
Laid before side of the elevator car substantially parallel to the moving direction of the car, a first induction line for flowing receiving said current from said power supply means,
A second induction wire that is laid on the rear side of the cage substantially in parallel with the direction of movement of the cage, and receives a current in phase with the current flowing from the power supply means to the first induction wire;
Attached to the front side of the car to form a gap between the first guide wire in the car side of the first induction line, the first power-receiving carp to take out current by an electromagnetic induction from said first induction line And
A second power receiving coil that is attached to the rear side of the cage by forming a gap between the second induction wire and the second induction wire on the cage side, and takes out current from the second induction wire by electromagnetic induction. When,
An elevator power supply apparatus comprising: combining means for combining the currents taken by each of the first and second power receiving coils and maintaining a constant current supplied to the car . The first guide wire is laid near one of the guide rails that guides the elevator car ,
The elevator power feeder according to claim 1 or 2, wherein the second guide wire is laid in the vicinity of the other of the guide rails . Current which varies with time elevator feed unit according to claim 1 to 3, characterized in that the sinusoidal current. Current which varies with time elevator feed unit according to claim 1 to 3, characterized in that the triangular wave current. Elevator feed unit according to claim 1 to 3, characterized in that it has a shape with increased surface area of the magnetic body of the power receiving coil to retrieve the current electromagnetic induction from the induction line. The elevator power supply apparatus according to any one of claims 1 to 3 , wherein a power supply battery for an elevator car door drive device is installed in the car.

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