JP4651855B2 - Elevator equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevator control device, and more particularly to an elevator device that can perform an emergency stop test without increasing the size of an inverter or an electric motor.
[0002]
[Prior art]
FIG. 5 is a block diagram showing an elevator control device described in Japanese Patent Laid-Open No. 05-262469. In FIG. 5, 1 is a three-phase AC power source, 7 is a hoisting motor, 8 is a detector for detecting an elevator speed, 9 is a sheave, 10 is a counterweight, 11 is a car, 12 is a rope, 20 is a Main contactor, 21 is an input reactor, 22 is a converter, 23 is a smoothing capacitor, 24 is an inverter, 26 is a speed command generator, 27 is an elevator control circuit that controls the inverter 24 and the converter 22 so as to follow the speed command, 28 Is a voltage detection device, 29 is an inverter drive circuit, and 30 is a converter drive circuit.
[0003]
In the elevator control apparatus configured as described above, when the elevator is completed, an emergency stop test is performed to verify its safety. In the emergency stop test, the electric motor 7 is operated in a direction in which the car 11 is lowered in a state where the emergency stop (not shown) attached to the elevator car 11 is operated to stop the car 11.
[0004]
At this time, since the car 11 is prevented from moving up and down by the emergency stop operation, the sheave 9 tries to draw out only the rope 12 from the counterweight 10 side to the car side, and the rope 12 is loosened, that is, contact with the sheave 9 The pressure drops and eventually the sheave 9 begins to idle. If the force to stop the car due to the emergency stop is insufficient, the car 11 is lowered by the amount of the rope 12 retracted, and thus the safety of the emergency stop can be verified in this way. At the time of this emergency stop test, the electric motor 7 needs to output a very large torque sufficient to start idling as described above.
[0005]
Further, the emergency stop test requires low torque and a large torque. Generally, the voltage applied by the inverter 24 to the motor 7 is smaller and the current is larger than that at the time of rating due to the characteristics of the motor 7. Since the output current of the inverter 24 is limited by the ratings of the semiconductor elements constituting the inverter, when the required current during the emergency stop test increases, the inverter 24 is applied with a high-rated element only for the emergency stop test. The capacity must be increased.
[0006]
As a countermeasure, a method has been devised in which a step-down transformer 25 is inserted between the electric motor 7 and the inverter 24 to increase the output voltage of the inverter 24 and reduce the current, thereby reducing the inverter capacity. Yes.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional example, it is possible to reduce the capacity of the drive device (inverter 24), but it is necessary to take measures to insert the transformer 25, and the electric motor 8 generates torque necessary for this test. There was a problem of having to. Further, when the motor 8 is a synchronous motor, the output of the inverter 24 is almost direct current and the step-down transformer 25 cannot be used in the low speed operation during the emergency stop test. Further, when a permanent magnet synchronous motor is used for the motor 8, there is a possibility that the permanent magnet of the motor may be demagnetized due to an excessive current during the test.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator apparatus that can reduce not only a drive device (inverter) but also an electric motor.
[0009]
[Means for Solving the Problems]
An elevator apparatus according to the present invention includes an inverter that supplies AC power having a variable voltage and a variable frequency, a hoisting motor connected to an output side of the inverter, a sheave driven by the hoisting motor, and a winding wound on the sheave. A sled wheel that winds the rope, a counterweight connected to the other end of the rope via the baffle, and a cage provided in the cage. In an elevator apparatus having an emergency stop that engages with a guide rail and prevents the car from moving up and down, winding the rope around the sheave during the emergency stop test of the elevator by changing the position of the deflector or the sheave The feature is to reduce the corner.
[0010]
In addition, a movable device is provided that raises the position of the deflecting vehicle from the position during normal operation during the emergency stop test of the elevator.
[0011]
Furthermore, an elevator apparatus according to the present invention includes an inverter that supplies AC power having a variable voltage and variable frequency, a hoisting motor connected to an output side of the inverter, a sheave driven by the hoisting motor, and the sheave A sloping wheel for winding the rope, a counterweight connected to the other end of the rope via the baffle, and a hoistway provided in the cage An elevator apparatus having an emergency stop that engages with an inner guide rail to prevent the car from moving up and down, and is installed as an existing deflector, and in addition to the existing deflector, at the time of an emergency stop test Elevating device comprising a test deflector and raising a rope between the existing deflector and the sheave by raising the test deflector Comprising a, during emergency stopping test of the elevator, the elevator device by pushing up the rope between the sheave and the existing deflector wheel, is characterized in that to reduce the rope winding angle to said sheave .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below.
First, the outline until the sheave slips during the emergency stop test will be described with reference to FIG. In FIG. 1, the same parts as those of the conventional example shown in FIG. As new symbols, 13 is a deflecting wheel, and 17 is a machine base to which the electric motor 7, sheave 9 and deflecting wheel 13 are attached. Reference numeral 18 denotes an emergency stop provided on the car 11, and when the car 11 is operated, the car 11 engages with a guide rail (not shown) to prevent the car 11 from moving up and down.
[0013]
Here, the rope tension on the car 11 side is T1, and the rope tension on the counterweight 10 side is T2. Normally, if the load in the car 11 is a balanced load with a load factor of 50%, the balance is T1 = T2. When the car-side emergency stop test is performed now, the car 11 is further rotated in the direction in which the car 11 is lowered while the emergency stop 18 of the car 11 is in effect. When the emergency stop 18 of the car 11 is effective and fixed, the tension T1 on the car 11 side is reduced because the rope 12 is fed out to the car 11 side by the rotation of the sheave 9 and the rope 12 is loosened.
[0014]
Whether or not the rope 12 slides on the sheave 9 is determined by the traction ability. When the traction ability of the sheave 9 is Γ, the relationship between the tensions T1 and T2 satisfies the following formula (1), and the sheave 9 Starts idling.
Γ ≦ (T2 / T1) (1)
The traction ability Γ is a constant determined by the friction coefficient between the sheave 9 and the rope 12, the winding angle, and the like. The larger the winding angle, the larger the traction ability Γ.
[0015]
Further, the required torque Tq of the electric motor 7 that must be generated to idle the sheave is expressed by the following formula (2), where D is the sheave diameter.
Tq = D / 2 × (T2-T1) (2)
Further, from the equations (1) and (2), the electric motor generated torque at the time of the rope slip is the equation (3).
Tq = D / 2 × T2 × (1-1 / Γ) (3)
From this equation (3), it can be seen that if the traction ability Γ is reduced, the motor generated torque Tq for causing the rope slip is also reduced.
[0016]
The present invention has been made in view of the above-described points, and reduces the required generated torque of the electric motor 7 by reducing the traction capability only during the emergency stop test. Hereinafter, specific embodiments will be described.
[0017]
Embodiment 1 FIG.
FIG. 2 is a configuration diagram illustrating the elevator apparatus according to Embodiment 1 of the present invention.
In the first embodiment, the deflector 13 is provided so that its position is movable, and is structured to be moved up and down (positions 13a and 13b) by the movable device 14.
[0018]
During normal operation of the elevator, the deflector is at the position 13a so as to increase the winding angle of the rope 12 around the sheave 9 in order to increase the trunking ability so as not to cause rope slip. In this figure, the machine base is omitted for explanation.
[0019]
On the other hand, at the time of the emergency stop test, the elevating device 14 raises the sled wheel to the position 13b. As shown in FIG. 3, the relationship between the sheave 9 and the rope 12 at the normal time and the test is as follows. When the deflecting wheel is at the position 13a, the rope is at the position 12a, and when the deflecting wheel is at 13b, 12b.
[0020]
The wrapping angles of the rope 12 as viewed from the sheave 9 are θa and θb, respectively, and it can be seen that the wrapping angle decreases when the deflecting wheel 13 is raised. Therefore, since the rope winding angle around the sheave 9 is reduced, the traction capability Γ is also reduced, and the required torque that the motor 7 must generate during the emergency stop test can be reduced.
[0021]
Embodiment 2. FIG.
In the first embodiment described above, the winding angle is reduced by using the existing deflecting vehicle. However, in this second embodiment, the test deflecting vehicle is used as the deflecting vehicle in addition to the existing deflecting vehicle. The configuration will be described in which the traction capacity is reduced by using an additional test deflector only during the emergency stop test.
[0022]
FIG. 4 is a block diagram showing an elevator apparatus according to Embodiment 2 of the present invention. In FIG. 4, 15 is a test sled wheel provided in addition to the existing sled wheel 13 and is attached at the time of the emergency stop test, and 16 is mounted on the machine base 17 to raise the test sled wheel 15 and raise the existing sled wheel 15. It is an elevating device that pushes up the rope 12 between the deflecting wheel 13 and the sheave 9.
[0023]
In FIG. 4, the sheave 9 and the deflector 13 are configured during normal operation, but the test deflector 15 can be attached for an emergency stop test. At the time of the test, the test deflector 15 is attached to the machine base 17 and is lifted by the lifting device 16 to push up the rope 12. As a result, similar to the first embodiment, the winding angle of the rope around the sheave 9 can be reduced, the trunking ability can be reduced, and the motor generated torque during the test can be reduced.
[0024]
Therefore, according to each of the above-described embodiments, the trunking capability during the emergency stop test can be reduced and the generated torque of the motor can be reduced. Therefore, the capacity of the motor and the drive device (inverter 24) can be The torque capacity required for the operation of the motor can be determined, and the drive device and the electric motor can be optimized. This is because the required torque for the emergency stop test is large so far, and it is possible to reduce the size of the device in the case where the drive device and the electric motor have been increased in size.
The above effect can be obtained by moving the deflector or adding a test deflector, but the same effect can be expected by making the position of the sheave movable.
Further, the same effect can be obtained even when a synchronous motor, particularly a permanent magnet type synchronous motor, which cannot be applied by the conventional method using the step-down transformer, is used. Therefore, the size can be reduced regardless of the type of electric motor.
[0025]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the trunking capacity during the emergency stop test and reduce the generated torque of the electric motor. Therefore, the capacity of the electric motor and the driving device is necessary for actual operation. The torque capacity can be determined, and the drive device and the motor can be downsized.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining a sheave and a rope trunk, and is a diagram for explaining an outline until a sheave slips during an emergency stop test.
FIG. 2 is a configuration diagram illustrating an elevator apparatus according to Embodiment 1 of the present invention.
FIG. 3 is a diagram for explaining a winding angle of a rope according to the first embodiment of the present invention.
FIG. 4 is a configuration diagram showing an elevator apparatus according to Embodiment 2 of the present invention.
FIG. 5 is a configuration diagram of an elevator system for explaining a conventional example.
[Explanation of symbols]
7 Motor, 9 Sheave, 10 Balance weight, 11 Car, 12 Rope, 13 Baffle, 14 Movable device, 15 Test baffle, 16 Lift, 17 Machine stand, 18 Emergency stop, 24 Inverter.

Claims (3)

An inverter that supplies AC power of variable voltage and variable frequency;
A hoisting motor connected to the output side of the inverter;
A sheave driven by the hoisting motor;
Whether connected to one end of a rope wound around the sheave,
A deflector that winds the rope;
A counterweight connected to the other end of the rope via the deflector;
An elevator apparatus provided with an emergency stop provided on the car and engaged with a guide rail in the hoistway to prevent the car from going up and down,
An elevator apparatus characterized in that the position of the deflector wheel or the sheave is made variable so that the rope wrapping angle around the sheave is reduced during the emergency stop test of the elevator. The elevator apparatus according to claim 1,
An elevator apparatus comprising: a movable device that raises the position of the baffle from a position during normal operation during the emergency stop test of the elevator. An inverter that supplies AC power of variable voltage and variable frequency;
A hoisting motor connected to the output side of the inverter;
A sheave driven by the hoisting motor;
Whether connected to one end of a rope wound around the sheave,
A deflector that winds the rope;
A counterweight connected to the other end of the rope via the deflector;
An emergency stop provided on the car for engaging the guide rail in the hoistway to prevent the car from going up and down;
In an elevator apparatus equipped with
As the deflecting vehicle, an existing deflecting vehicle and a test deflecting vehicle to be attached at the time of an emergency stop test in addition to the existing deflecting vehicle are provided, and the existing deflecting vehicle is raised by raising the test deflecting vehicle. And a lifting device that pushes up the rope between the sheave and the sheave ,
An elevator apparatus characterized in that, during the emergency stop test of the elevator, a rope between the existing deflecting wheel and the sheave is pushed up by the lifting device to reduce a rope wrap angle around the sheave .

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