JPH0837771A - Linear-motor elevator - Google Patents

Abstract

PURPOSE:To obtain a linear-motor elevator in which a rescue operation can be performed by a method wherein, even when either one armature winding for a double-sided linear motor is discontinued or short-circuited, an armature winding on the other side is used. CONSTITUTION:A right armature 5a and a left armature 5b for a double-sided linear induction motor are electrically separated completly. As a result, even when either one armature coil is short-circuited, a current detected by a DCT 17 is judged to be the detection of an convercurrent by an inverter control circuit 19, and a cage is emergency-stopped. In addition, when either one armature coil is discontinued or when either one power-supply cable is detached or disconnected, a motor current detected by the DCT 17 with reference to an instruction current is reduced to 1/2, it cannot follow the instruction current, and it can be detected by means of simple software or hardware. Thereby, when one atmature for a linear motor installed at a counterweight becomes abnormal, a rescue operation can be performed easily without switching over the interconnection of a power-supply wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor elevator which does not require a hoisting machine, and more particularly to a double-sided linear motor elevator having two armatures on both sides of a stator.

[0002]

2. Description of the Related Art A conventional rope-type elevator generally uses a hoist. In this system, a machine room is provided in the upper part of the elevator hoistway, a hoisting machine with traction is installed in this room, and the rotating motor of the hoisting machine is driven to suspend the cage. A rope with a weight hanging
The car is moved up and down to raise and lower the car. However, with this method, a machine room is required above the hoistway, so a dedicated penthouse etc. is required on the building or roof,
The height of the building was increased by that much, and there was a problem with the building that had problems such as sunshine rights.

In order to improve such a problem, a linear motor elevator using a linear induction motor has been considered in recent years. There are two types of linear motor elevators, one with a rope for suspending the car and the other without. The linear motor elevator with the inner rope is
The hoisting machine has been eliminated from the conventional rope type elevator, the primary side mover of the linear induction motor is installed in the hanging weight part, and the secondary conductor is the secondary side stator in the hoistway on the building side. Are arranged.

In a one-sided flat plate linear motor elevator in which a primary side mover is arranged on one side of a flat plate secondary conductor, a hanging weight having the mover attached and a flat plate 2 attached to the building side.
A suction force works between the next conductors. Therefore, a cylindrical linear motor elevator or a double-sided flat plate linear motor elevator having a structure for canceling the suction force is generally used. In the cylindrical linear motor elevator, the primary side mover has a cylindrical shape and is arranged around a cylindrical secondary conductor.
However, in this case, the column of the secondary conductor is supported only by the upper and lower portions, and thus the number of floors to be lifted is limited. On the other hand, in the double-sided flat plate linear motor elevator, in principle, there is no limit to the number of floors that can be lifted and lowered, but because a suction force acts between the primary windings of the armatures arranged on both sides of the secondary conductor, The structural member to which the side mover is attached requires strength.

As an example of a double-sided flat plate linear motor elevator, the S.S. FIG. 6 shows the contents described in 10-3-1, "AC Drive Application of Linear Drive (1) Linear Motor Elevator". In the figure, 1 is an elevator car on which a person or the like rides, 2 is a car 1 and a rope for suspending a weight 4, 3 is a return wheel for changing the direction of the rope 2, 4 is a car and 1 The counterweight 5 for balancing the balance is a mover of the linear induction motor attached to the counterweight 4, 6 is a flat secondary conductor made of a conductor such as aluminum, and 7 is attached to the counterweight 4. It is a rail clamp type brake that brakes the car 1.

In such a double-sided flat plate linear motor elevator, an induction motor mounted on the counterweight 4 is used.
When power is supplied to the movable element 5 of the rotor, a thrust is generated between the movable element 5 and the flat plate secondary conductor 6 which is the stator, and the counterweight 4 moves up and down. Since the balance weight 4 and the car 1 are connected by the rope 2, when the balance weight 4 moves up and down, the vertical direction is reversed by the return wheel 3 and the car 1 moves up and down. The brake 7 operates when the car 1 is stopped or an abnormality occurs.
Brake.

FIG. 7 shows an example of a conventional feeding cable for feeding power to the linear motor of the double-sided linear motor elevator shown in FIG. In the figure, 8 is a power supply cable, 9 is a relay support under the car 1 of the power supply cable 8, 10 is a relay support on the building side of the power supply cable 8, 1
Reference numeral 1 is a controller for driving a linear motor.

FIG. 8 shows a conventional 4-pole double-sided linear induction motor winding system. In the figure, 5a and 5b are armatures provided on both sides of the stator 6 of the induction motor, and 12
Is a three-phase power supply line for supplying electric power to the armatures 5a, 5b of the induction motor, and is built in the power supply cable 8 between the counterweight 4 and the control device 11.

As shown in FIGS. 7 and 8, in the conventional double-sided linear motor, the power supply cable 8 connected to the control device 11 passes through the relay support 10 and the car relay support 9 on the building side. And reach the counterweight 4. The three-phase power supply line 12 in the power supply cable 8 on the counterweight 4 is branched into two sets and connected to the left and right armatures 5a and 5b of the mover 5 of the linear induction motor. Further, since the left and right armatures 5a and 5b normally use armature coils of the same winding, the three-phase input to the left and right armature coils is the U phase among the U phase, V phase, and W phase. The W phase is reversely connected.

[0010]

The conventional linear motor elevator incorporating the armature of such a linear induction motor has the following problems. Linear motor elevator
On the other hand, since the counterweight incorporates a linear motor mover, the linear motor itself may be broken or short-circuited, or the linear motor itself may malfunction. -There may be a problem that the power supply cable to the power supply is dropped. In such a case, it is common practice to release the brake and let the car and the counterweight heavier fall to free the passengers in the car. However, such a rescue method is very difficult because the position, speed, etc. of the car during free fall are unknown unless it is looked into the hoistway.

The present invention has been made in view of the above-mentioned points and has been made for a double-sided linear induction motor elevator, and is not affected by an abnormality of one armature winding or a drop of the power supply cable. The purpose is to provide a highly reliable linear motor elevator capable of rescue operation.

[0012]

SUMMARY OF THE INVENTION The present invention is a linear motor comprising a stator provided in a hoistway and two armatures on both sides of the stator and a mover provided in a counterweight portion. And a plurality of sets of power supply lines for supplying electric power to each of the armatures separately, and a control device having a connecting means for separately connecting to each of the power supply lines.

Here, a current detection means for separately detecting the current flowing through each of the above-mentioned power supply lines is provided, and a control circuit for controlling the power supplied to the power supply line based on the output from the current detection means is provided. May be.

Furthermore, you may make it comprise the electric power feeding means which supplies electric power separately to each of the above-mentioned electric power feeding lines.

[0015]

According to the present invention, even if one of the armatures of the double-sided linear motor is broken or short-circuited, the rescue operation can be performed by using the other armature winding. Further, even when one set of power supply lines to the armature is disconnected and disconnected, power can be supplied to another armature by the other set of power supply lines, so that rescue operation can be performed.

Further, it is possible to automatically determine on which side of the double-sided linear motor the armature winding or the power supply line is abnormal, and the rescue operation can be automatically performed.

Further, even if any one of the power supply means for the power supply line is out of order, the rescue operation can be automatically performed.

[0018]

【Example】

Example 1. FIG. 1 is a diagram illustrating a power supply method according to the first embodiment. In the figure, 13 is a diode converter for converting an AC power input into DC, and 14 is a smoothing capacitor. Reference numeral 15 is a chopper circuit composed of a resistor and a transistor for consuming the regenerative energy from the mover 5, 16
Is an inverter bridge circuit that performs pulse width modulation (PWM), and 17 is a DCC for current detection that normally detects two-phase current
T (Direct Current Current Transducer), 18a and 18b are provided in the control device 11, and the three-phase power supply line 12 and the control device 11 in the power supply cables 8a and 8b are provided.
A contactor contact for connecting with the three-phase power supply line 12 inside, 19
Is an inverter control circuit for controlling the speed of the elevator. Here, a diode converter 13, a smoothing capacitor 14, a chopper circuit 15, an inverter bridge circuit 16, a DCCT 17 for current detection, a contactor contact 18
a, 18b and inverter control circuit 19 for controlling device 1
1 is formed.

In the linear motor elevator of the first embodiment constructed as described above, the alternating current from the alternating current power source (not shown) is converted into the direct current by the diode converter 13 and the smoothing capacitor 14. And the inverter control circuit 19
In accordance with this control, vector control is performed so that the elevator moves up and down at a predetermined speed, and the direct current is pulse-width modulated (PWM) by the inverter bridge circuit 15 according to this control.
Although the three-phase power supply line 12 is output from the inverter bridge circuit 15, the contact contact 1 is branched in the middle in two directions.
Enter 8a, 18b. From the outside of the control device 11, two sets of three
The phase feed line is connected to the contactor contacts 18a, 18b,
Left and right armatures 5 of the linear motor attached to the counterweight 4 via the power supply cables 8a and 8b, respectively.
a, 5b. The power thus pulse-width modulated by the inverter bridge circuit 15 is supplied from the control device 11 to the left and right armatures 5a and 5b by the separate power supply cables 8a and 8b. Inverter bridge circuit 15
Three-phase power supply line 12 in the part that has not yet been branched from the
Is a DCCT1 for current detection that normally detects two-phase current.
7 is attached, and the detected current value is input to the inverter control circuit 19, and the inverter control is performed based on this.

In such a system, since the left and right armatures 5a and 5b of the double-sided linear induction motor are electrically completely separated, when one of the armature coils is short-circuited, it is detected by the DCCT 17. Inverted current
The control circuit 19 judges that the overcurrent has been detected, and the car 1 is brought to an emergency stop. Also, in the case of either one of the armature coil disconnection or the disconnection of one of the power supply cables, the motor current detected by the DCCT 17 is 1/2 of the command current, and the command current However, it can be detected by simple software or hardware (not shown).

In the case of overheating, etc., the contact input of a thermal switch (not shown) usually built in the armature is detected by the control circuit 19 via the power supply cables 8a and 8b, and the abnormality is easily detected. To be determined. When an abnormality is discriminated in this way, the rail pinch type brake 7 is activated and
After the inverter bridge circuit 16 is cut off, the contactor contacts 18a and 18b can be opened for an emergency stop.

In such a circuit, a person judges the power supply wiring to the armature on the abnormal side, turns on the contactor 18a or 18b for supplying power to the armature on the normal side, and causes a current to flow through the armature on one side, and a double-sided linear The induction motor is used as a one-sided linear induction motor to perform rescue operation.

A principle diagram showing that the double-sided linear induction motor can be used as a single-sided linear induction motor is shown in FIG.
4 shows. FIG. 4 is an equivalent circuit of the magnetic path of the double-sided linear induction motor. FIG. 5 is an equivalent circuit of the magnetic path of the one-sided linear induction motor in which the armature 5b on one side of the two-sided linear induction motor has failed and is regarded as simple iron. Numerals 20a and 20b are ampere patterns N · I which are the magnetomotive forces of the armatures 5a and 5b. Here, N is the number of turns and I is the current. 21, 2
Reference numeral 2 is a magnetic resistance Rg mainly generated by the air-gap of the magnetic path.

In FIG. 4, the magnetic flux Φ = 2N · I / 2Rg = N ·
It becomes I / Rg. Further, in FIG. 5, magnetic flux Φ = N · I / 2Rg
= N · I / 2Rg. Therefore, as long as the armature iron core is not saturated even when the double-sided linear induction motor is used as the single-sided linear induction motor, the current I is set to 2 in the circuit shown in FIG.
By doubling the flow rate, it is possible to generate the same magnetic flux as the circuit of FIG. In the case of a linear motor used for a linear motor elevator, it is usually designed so as to obtain a thrust about twice as much as a steady required thrust including acceleration thrust and the like. Therefore, the armature of the linear motor on one side is abnormal or the power supply case
If the bull falls off, rescue operation without acceleration time is sufficient. Further, in the linear motor elevator described above, in addition to the linear motor as the counterweight, an encoder or the like for speed and position detection is laid, so the signal cable to the counterweight has those signal lines. Is laid, but is not shown because it is not directly related to the present invention.

Example 2. FIG. 2 is another example of the present invention which is an improvement of the first embodiment. In FIG. 2, the three-phase power supply line 12 output from the inverter bridge circuit 15 is branched into two in the middle and connected to the contactor contacts 18a and 18b. Two sets of three-phase power supply lines 12 for supplying power to the armatures 5a, 5b are respectively connected to the contactor contacts 18a, 18b. Normally, two-phase current detection is performed for each of these two sets of three-phase power supply lines. The current detecting DCCTs 17a and 17b are attached, and the detected current value is input to the inverter control circuit 19, and the inverter control is performed based on this.

With this circuit, the inverter control circuit 19 can separately monitor the current of each armature of the double-sided linear induction motor by the DCCTs 17a and 17b, so that the abnormal side can be easily discriminated. Becomes Therefore, even in the case of rescue operation after an abnormality,
Since the control circuit 19 can automatically discriminate between either 18a or 18b and turn them on, it is possible to easily stop the operation at a predetermined floor. In this case, two sets of DCCT outputs Iu1 and Iv are used for controlling the current of the inverter.
1, Iu2, Iv2 are added, and Iu = Iu1 + Iu
2, Iv = Iv1 + Iv2, and Iw = −Iu−Iv.

Embodiment 3 FIG. FIG. 3 shows another embodiment in which the second embodiment is further improved. That is, an inverter bridge circuit 16a for pulse-width-modulating the current for driving the linear motor,
16b and two armatures 5a and 5b are provided by an independent inverter bridge circuit. Although not shown in the inverter control circuit 19, two sets of current control circuits are provided corresponding to the two inverter bridges 16a and 16b.

In the linear motor elevator having such a control system, since the inverter bridge circuit, the feeding cable and the linear motor section are a double system, the feeding cable and the linear motor are the same. Not only the abnormalities of the
Even if the bridge is damaged, the normal side inverter bridge operates to perform rescue operation.

In the above description, a linear induction motor was used as the linear motor, but another linear motor having a similar double-sided structure, for example, a linear motor elevator composed of a linear synchronous motor. The same effect can be obtained with.

[0030]

According to the present invention, when one armature of the linear motor provided on the counterweight becomes abnormal, or when the power feeding line to the armature is disconnected, the wiring of the power feeding line is performed. The rescue operation of the linear motor elevator can be easily performed without replacement.

Further, the control circuit easily and automatically determines which of the two armatures or the power supply line is abnormal, so that the rescue operation to a predetermined floor can be automatically performed.

Furthermore, even if one of the power feeding means for supplying power to the two armatures fails, the abnormality can be easily automatically discriminated and the rescue operation to a predetermined floor can be automatically performed.

[Brief description of drawings]

FIG. 1 is a linear motor elevator according to an embodiment of the present invention.
FIG.

FIG. 2 is an explanatory view showing a power supply system of a linear motor elevator according to another embodiment of the present invention.

FIG. 3 is a linear motor elevator according to a third embodiment of the present invention.
FIG.

FIG. 4 is a principle view showing a magnetic path on the primary side of a double-sided linear induction motor.

FIG. 5 is a principle diagram showing a magnetic path on the primary side of a double-sided linear induction motor in which one side has failed.

FIG. 6 is an explanatory view showing the outline of a double-sided flat plate linear induction motor elevator.

FIG. 7 is an explanatory view showing how to suspend a power supply cable of a conventional linear motor elevator.

FIG. 8 is an explanatory view showing a power feeding system of a conventional linear motor elevator.

[Explanation of symbols]

 1. Basket 2. Rope 3. Return car 4. Balance weight 5. Linear motor mover 5a. Linear motor armature 5b. Linear motor armature 6. Secondary conductor 7. Rail sandwich break 8a. Power supply cable 8b. Power supply cable 11. Control device 12. Three-phase power supply line 13. Diode converter 14. Smoothing capacitor 15. Chopper circuit 16. Inverter bridge circuit 16a. Inverter bridge circuit 16b. Inverter bridge circuit 17. DCCT for current detection 17a. DCCT for current detection 17b. DCCT for current detection 18a. Contactor contact 18b. Contactor contact 19. Inverter control circuit 20a. Magnetomotive force 20b. Magnetomotive force 21. Magnetic resistance 22. Magnetic resistance

Claims (3)

[Claims] 1. A linear motor comprising a stator provided on a hoistway and two armatures on both sides of the stator and a mover provided on a counterweight portion, and each of the armatures. A plurality of sets of power supply lines for separately supplying electric power to each of the power supply lines, and a control device having a connecting means for separately connecting to each of the power supply lines.
Taelevet. 2. A current detection means for separately detecting a current flowing through each of the power supply lines is provided, and a control circuit for controlling electric power supplied to the power supply line based on an output from the current detection means is provided. The linear motor elevator according to claim 1, wherein: 3. The linear motor elevator according to claim 2, further comprising power feeding means for individually feeding power to each of the power feeding lines.