JP2006341980A - Elevator device and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator device capable of suppressing an increase in the sizes of AC motors for liftably moving a car and an inverter driving the motor by properly using a plurality of installed elevators when the elevators are operated at low speeds with heavy loads in a short time in the elevator device in which the plurality of elevators are installed, and a method of controlling the elevator device. <P>SOLUTION: When the first elevator among the first and second elevators of the plurality of elevators installed in the elevator device is operated at low speeds with heavy loads in a short time, the drive torque of the AC motor rotatingly driving the sheave of the second elevator is added to the drive torque of the AC motor rotatingly driving the sheave of the first elevator. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elevator apparatus and a control method therefor, and is particularly suitable when an elevator is operated at a heavy load for a short time, such as when an elevator is completed or an emergency stop test periodically performed as a safety verification. The present invention relates to an elevator apparatus and a control method thereof.

  Generally, an emergency stop test is performed at the time of completion of an elevator or as a safety verification, and this emergency stop test will run the elevator under heavy load for a short time. For convenience of explanation, an emergency stop test which is a short-time heavy load operation of this elevator will be described first.

  In the emergency stop test, an AC motor, for example, an induction motor is rotated so as to move the car in the downward direction in a state where the emergency stop device attached to the elevator car is operated to prevent the car from moving. Then, since the car does not move, the sheave tries to draw only the rope from the counterweight to the car side, the rope on the car side starts to loosen, the static friction force generated between the rope and the sheave decreases, and overcomes the static friction force. When torque is obtained by the induction motor, the sheave eventually runs idle. If the force for holding the car of the emergency stop device is insufficient, the cage will be lowered by the amount of the rope retracted, and the emergency stop device will not operate sufficiently. In this way, the safety of the safety device is verified.

  However, when performing an emergency stop test, the induction motor needs to generate a very large torque. In large-capacity elevators installed in large buildings, it is inevitable that the size of the induction motor and the inverter that drives it will be increased. It is in. In particular, since the emergency stop test is performed at the time of completion of the elevator or during periodic inspection, it is very infrequent, and it is inefficient to increase the size of the induction motor and the inverter only for the emergency stop test.

  Therefore, as a conventional technique for solving this, the winding of the induction motor is set to Δ connection during normal operation, and the current flowing through each winding is changed to √ ( 3) A control device for an AC elevator that doubles and does not require an increase in the size of an inverter has been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 6-135653 (Summary Column, FIGS. 2 and 3)

  However, in the control device for an AC elevator disclosed in the above-mentioned Patent Document 1, it is possible to avoid an increase in the size of the inverter, but in order to generate a large torque, an increase in the size of the induction motor cannot be avoided, and an emergency stop test is performed. If the reconnection of the windings is performed, it is necessary to sufficiently check the reliability of the elevator before and after the test, for example, check the connection of the induction motor and check the normal operation after the connection.

  The present invention has been made in view of the above problems, and in an elevator apparatus in which a plurality of elevators are installed, by appropriately using the elevators therein, an AC motor that controls the up-and-down movement of the car and the drive thereof It is an object of the present invention to provide an elevator apparatus and a control method thereof for suppressing the increase in size of the inverter to be operated.

  The elevator apparatus according to the present invention is provided with a plurality of elevators that are moved up and down by an AC motor connected to an AC power supply via an inverter, and each of the elevators is connected via a sheave that is rotationally driven by the AC motor. In the elevator apparatus in which the car and the counterweight moves up and down in the opposite direction, when the elevator of either one of the elevators installed in the plurality is operated at a low speed heavy load for a short time, the first A coupling means for adding together the driving torque of the AC motor that rotationally drives the sheave of one elevator and the driving torque of the AC motor that rotationally drives the sheave of the second elevator is provided.

  The elevator apparatus control method according to the present invention includes a plurality of elevators that are moved up and down by an AC motor connected to an AC power source via an inverter, and each of the elevators is rotationally driven by the AC motor. In a control method of an elevator apparatus in which a car and a counterweight moves up and down through a car, when the first elevator of the plurality of elevators installed and the first elevator in the second elevator are operated at a low speed and heavy load for a short time. The driving torque of the AC motor that rotationally drives the sheave of the second elevator is added to the driving torque of the AC motor that rotationally drives the sheave of the first elevator.

  According to the present invention, an AC motor that satisfies the specifications only for an actual elevator operation without increasing the size of the AC motor that controls the lifting and lowering of the elevator car, and without increasing the size of the inverter that drives the AC motor, and With the inverter that drives the motor, there is an effect that it is possible to cope with a large torque required for a short time heavy load operation of the elevator such as an emergency stop test.

  Exemplary embodiments of an elevator apparatus and a control method thereof according to the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG.
1 to 5 are diagrams for explaining Embodiment 1 of the present invention. FIG. 1 is a schematic configuration diagram of an elevator apparatus, FIG. 2 is a block diagram of a main part showing an elevator control apparatus, and FIG. FIG. 4 is a side view showing an embodiment of a coupling means used during short-time heavy load operation of an elevator such as an emergency stop test, and FIG. 5 shows another embodiment of the coupling means. FIG.

  FIG. 1 illustrates a schematic configuration of an elevator apparatus according to the first embodiment. Here, an embodiment in which two hoistways, a hoistway A and a hoistway B are provided, is shown. The state where the elevator B is installed in the hoistway B is illustrated. In the description of the first embodiment, first, the configurations of the elevator A and the elevator B will be described.

  In FIG. 1, an elevator A is configured as follows. That is, a hoistway A is laid in a building such as a building where the elevator A is installed. In this hoistway A, a rail 2A for guiding the car 1A of the elevator A and a rail (not shown) for guiding the counterweight 3A are respectively laid, and further, the vehicle is bent on the ceiling of a building such as a building. 4A is attached.

  A sheave 5A is attached to the upper part of the car 1A, and guide shoes (not shown) for guiding the car 1A along the rails 2A are attached to both sides of the car 1A. One end of a rope 6A is attached to the ceiling portion of the car 1A, and the other end of the rope 6A is attached to a counterweight 3A via a sheave 5A and a deflector 4A. The sheave 5A is configured to move up and down in the direction opposite to the counterweight 3A while being driven by the AC motor, for example, a three-phase induction motor 7A, while the car 1A is guided by the rail 2A. Yes.

  Further, an emergency stop device 8A for fixing the car 1A to the rail 2A during short-time heavy load operation of the elevator, such as an emergency stop test described later, is mounted below both sides of the car 1A.

  Next, regarding the elevator B, the elevator B is installed in the hoistway B. The elevator B includes a car 1B, a rail 2B, a counterweight 3B, a deflection wheel 4B, a sheave 5B, a rope 6B, and a three-phase induction motor 7B, which are configured in the same manner as the elevator A. Therefore, the detailed description about the elevator B is abbreviate | omitted.

  The elevator apparatus according to Embodiment 1 is configured as described above, and in normal times, the operation of elevator A and elevator B is independently controlled. Next, the control device will be described with reference to FIG.

  FIG. 2 is a block diagram showing the main part of the elevator control apparatus. In FIG. 2, the converter 20 is composed of a switching element 20a of a three-phase full bridge shown in FIG. It is connected via a reactor 22 and converts the AC voltage of the three-phase AC power source 21 into a DC voltage. The DC voltage output from the converter 20 is smoothed by the smoothing capacitor 23 and input to the inverter 24. The inverter 24 is configured by a three-phase full-bridge switching element similar to the converter 20, converts the DC voltage output from the converter 20 into an AC voltage of a desired frequency, and is connected to the output terminal of the three-phase induction. The electric motor 7A is rotationally driven. The rotational speed of the three-phase induction motor 7A is detected by the speed detector 25.

  The inverter control device 26 uses the actual speed of the three-phase induction motor 7A detected by the speed detector 25 and the value of the inverter current detected by the current detector 27, so that the actual speed of the three-phase induction motor 7A generates a speed pattern. A PWM control pulse is supplied to the inverter 24 so as to follow the speed command value from the device 28 to control the inverter 24.

  As described above, the inverter 24 is controlled and the three-phase induction motor 7A is rotationally driven to drive the sheave 5A of the elevator A, and the car 1A of the elevator A moves up and down by the rotation of the sheave 5A.

  In the elevator B, the three-phase induction motor 7B is controlled by a control device similar to the elevator A. However, the control device for the elevator B and the control device for the elevator A have the same configuration, and thus description thereof is omitted. .

  Next, an embodiment of a short-time heavy load operation of the elevator such as an emergency stop test of the elevator apparatus having the above-described configuration will be described.

  In FIG. 1, elevator A is the target elevator for short-time heavy load operation such as an emergency stop test. When performing a heavy load operation for a short time such as an emergency stop test of the elevator A, the three-phase induction motor 7A of the elevator A and the three-phase induction motor 7B of the elevator B are integrated by the coupling means 9 having the same rotation direction. Make it. By integrating the two three-phase induction motors 7A and 7B, the torque of the integrated three-phase induction motors 7A and 7B is a sum of the output torques of the three-phase induction motors 7A and 7B.

  Generally, in an elevator motor, when the specifications for short-time heavy load operation such as an emergency stop test are excluded, the maximum output torque is the torque required during the acceleration operation of the elevator, A value obtained by adding the maximum output torques of the respective motors can be the maximum output torque of the integrated motor. That is, as described above, by connecting the three-phase induction motor 7A of the elevator A and the three-phase induction motor 7B of the elevator B so that the rotation directions thereof are the same, a heavy load for a short time such as an emergency stop test is performed. It becomes possible to bear the large torque required for operation by the two three-phase induction motors 7A and 7B.

  FIG. 4 is a side view showing an embodiment of the coupling means 9. The shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B that are rotationally driven by the three-phase induction motor 7A are respectively connected to the base 41. The bearings 42A and 42B are rotatably supported, and the shafts 40A and 40B are mechanically coupled by couplings 43A and 43B and a fastening tool 44. That is, the couplings 43A and 43B are engaged with the shafts 40A and 40B by the key 45, and the couplings 43A and 43B are mechanically coupled by the fastening tool 44. Thereby, the three-phase induction motor 7A and the three-phase induction motor 7B can be integrated, and the output torques of both can be added together.

  The above embodiment is the coupling means 9 used when the shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B are arranged in a straight line, but the shaft 40A of the sheave 5A and the shaft of the sheave 5B are used. For example, spline coupling can be used, and various coupling means can be considered.

  FIG. 5 is a side view showing another embodiment of the coupling means 9, and gears 50A and 50B are formed at respective shaft ends of the shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B. The shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B are coupled by a rack gear coupling device 52 including a rack 51 that meshes with 50A and 50B, respectively. That is, the rack gear coupling device 52 includes a rack 51, a guide body 53 attached to the rack 51, and a mounting base 54 that guides the guide body 53. Note that the mounting base 54 is integrally coupled to the base 55. The shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B are in mesh with each other by the rack gear coupling device 52, and the two three-phase induction motors 7A and 7B are integrated, and the output of both Torque can be added together.

  The embodiment shown in FIG. 5 is a coupling means used when the shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B are arranged in parallel. However, short-time heavy load operation such as an emergency stop test is performed. When this is done, the sheaves 5A and 5B do not need to make one rotation, and the sheaves 5A and 5B only need to rotate idly for a certain angle to check whether the car is lowered. Coupling with the device 52 is sufficient. The shaft 40A of the sheave 5A and the shaft 40B of the sheave 5B may be coupled, and the two three-phase induction motors 7A and 7B are integrated by a belt instead of the rack gear coupling device 52, and the output of both It is also possible to add torque.

  As described above, according to the first embodiment, two three-phase induction motors 7A, 7A, and 6A are connected by combining the shaft 40A of the hoist sheave 5A and the shaft 40B of the hoist sheave 5B. Since the 7B can be integrated and the output torques of both can be added together, the three-phase induction motors 7A and 7B can be added without increasing the size, and the inverter 24 for driving the elevator can be operated without increasing the size. The three-phase induction motors 7A and 7B that satisfy only the specifications and the inverter 24 that drives the three-phase induction motors have an effect of being able to cope with a large torque required for a short time heavy load operation of the elevator such as an emergency stop test.

Embodiment 2. FIG.
Next, a second embodiment will be described. FIG. 6 is a diagram illustrating a schematic configuration of the elevator apparatus according to the second embodiment.
In the hoistway A and the hoistway B in which two elevators, an elevator A and an elevator B, are arranged adjacent to each other, the elevator A and the elevator B are operated independently during normal operation. Since the configurations of the elevator A and the elevator B and the configuration of the control device are the same as those in the first embodiment, the description thereof will be omitted, and the elevator heavy load such as the emergency stop test of the elevator device having the above configuration will be omitted. An embodiment of the operation will be described.

  The elevator A will be described as a target elevator for a short time heavy load operation such as an emergency stop test. During a short time heavy load operation such as an emergency stop test, the return wheel 60 is installed, and the test rope 61 is connected to the upper part of the balance weight 3A of the elevator A and the upper part of the balance weight 3B of the elevator B via the return wheel 60. Connect. In a state where the emergency stop device 8A of the elevator A that is the subject of heavy load operation for a short time, such as an emergency stop test, is operated, the three-phase induction motor 7B of the elevator B is operated in a direction in which the counterweight 3B is lowered. As a result, the counterweight 3A of the elevator A acts in the upward direction, so that the torque required for the three-phase induction motor 7A of the elevator A can be reduced. Therefore, an effect equivalent to that the large torque required for a short time heavy load operation such as an emergency stop test is borne by the two three-phase induction motors 7A and 7B can be obtained.

  In the first embodiment, the two elevators have the same lifting process, and the sheave of the hoisting machine including the three-phase induction motor is required to be installed in the same machine room. In the second embodiment, the same lifting and lowering is required. Even if there is no need for a stroke and the sheaves of the hoisting machine are not capable of being combined, a configuration is possible by appropriately arranging the return wheel 60 and the test rope 61.

  According to the second embodiment, as in the first embodiment, only the actual elevator operation is performed without increasing the size of the three-phase induction motors 7A and 7B and without increasing the size of the inverter 24 that drives the three-phase induction motors 7A and 7B. The three-phase induction motors 7A and 7B that can satisfy the above specifications and the inverter 24 that drives the three-phase induction motors have an effect of being able to cope with a large torque required for a short time heavy load operation of the elevator such as an emergency stop test.

Embodiment 3 FIG.
Next, a third embodiment will be described. In the second embodiment, the counterweight 3A and the counterweight 3B are connected by the test rope 61 via the return wheel 60. However, instead of the counterweight 3B, as shown in FIG. The upper part may be connected. At that time, in a state where the emergency stop device 8A of the elevator A is operated, the three-phase induction motor 7B is operated in a direction in which the car 1B is lowered. At this time, the configuration of the elevator is not limited to 1: 1 roping, and can be adapted to 2: 1 roping. Since the other configuration is the same as that of FIG. 6 which is the second embodiment, the description thereof is omitted by giving the same reference numerals.

  Also in the third embodiment, as in the second embodiment, the three-phase induction motors 7A and 7B are not increased in size, and the inverter 24 for driving them is not increased in size, and only the actual elevator operation is performed. With the three-phase induction motors 7A and 7B that can satisfy the specifications and the inverter 24 that drives the motors, there is an effect that it is possible to cope with a large torque required for a short time heavy load operation of the elevator such as an emergency stop test.

  In each of the above-described embodiments, an embodiment in which two elevators, elevator A and elevator B, are provided side by side has been illustrated and described. However, the present invention is not limited to this, and a plurality of elevators are installed. Needless to say, the elevator apparatus may be used by appropriately using the elevators therein.

  As described above, the elevator apparatus and the control method thereof according to the present invention can be realized without increasing the size of the AC motor that controls the lifting and lowering movement of the elevator car, and without increasing the size of the inverter that drives the elevator motor. A large torque can be obtained by the AC motor that satisfies the specifications only for operation and the inverter that drives the motor, and industrial applicability is great.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the elevator apparatus explaining Embodiment 1 of this invention. It is a principal block block diagram which shows the control apparatus of an elevator. It is an internal block diagram of a converter. It is a side view which shows one Embodiment of the coupling means used at the time of short-time heavy load driving | running | working of an elevator, such as an emergency stop test. It is a side view which shows other embodiment of the coupling | bonding means used at the time of heavy duty heavy duty driving | running | working of an elevator, such as an emergency stop test. It is a schematic block diagram of the elevator apparatus explaining Embodiment 2 of this invention. It is a schematic block diagram of the elevator apparatus explaining Embodiment 3 of this invention.

Explanation of symbols

1A, 1B Car 2A, 2B Rail 3A, 3B Counterweight 4A, 4B Baffle 5A, 5B Sheave 6A, 6B Rope 7A, 7B Three-phase induction motor 8A, 8B Emergency stop device 9 Coupling means 20 Converter 20a Switching element 21 Three Phase AC power supply 22 AC reactor 23 Smoothing capacitor 24 Inverter 25 Speed detector 26 Inverter controller 27 Current detector 28 Speed pattern generator 40A, 40B Sheave shaft 41, 55 Base 42A, 42B Bearing device 43A, 43B Coupling 44 Fastening tool 45 Key 50A, 50B Gear 51 Rack 52 Rack gear coupling device 53 Guide body 54 Mounting base 60 Return wheel 61 Test rope

Claims (5)

A plurality of elevators that are moved up and down by an AC motor connected to an AC power source via an inverter are installed, and each of the elevators has a cage and a counterweight in a reverse direction via a sheave that is rotationally driven by the AC motor. In an elevator device that moves up and down,
Driving torque of an AC electric motor that rotationally drives the sheave of the first elevator when one of the first elevator and the second elevator installed in the plurality of elevators is operated at a low speed and heavy load for a short time. And a coupling means for adding together the driving torque of the AC motor for rotationally driving the sheave of the second elevator. The coupling means couples a rotating shaft of an AC motor that rotationally drives the sheave of the first elevator and a rotating shaft of an AC motor that rotationally drives the sheave of the second elevator. The elevator apparatus according to claim 1. Elevator apparatus in which a plurality of elevators that are moved up and down by an AC motor connected to an AC power source via an inverter are installed, and each of the elevators is moved up and down by a sheave that is rotationally driven by the AC motor. In
When the first elevator and the first elevator of the plurality of elevators installed in the plurality of units are operated at low speed and heavy load for a short time, one end is coupled to the counterweight of the first elevator and the other end is A rope coupled to the counterweight of the second elevator, and a return wheel that is disposed between the counterweight of the first elevator and the counterweight of the second elevator and winds the rope. Set up
The first elevator AC motor is rotationally driven in the direction in which the first elevator counterweight is raised, and the second elevator AC motor is rotationally driven in the direction in which the second elevator counterweight is lowered. The elevator apparatus characterized by doing. Elevator apparatus in which a plurality of elevators that are moved up and down by an AC motor connected to an AC power source via an inverter are installed, and each of the elevators is moved up and down by a sheave that is rotationally driven by the AC motor. In
When the first elevator and the first elevator of the plurality of elevators installed in the plurality of units are operated at low speed and heavy load for a short time, one end is coupled to the counterweight of the first elevator and the other end is A rope coupled to the car of the second elevator, a return wheel disposed between the counterweight of the first elevator and the car of the second elevator and winding the rope,
The AC motor of the first elevator is rotated in the direction in which the counterweight of the first elevator is raised, and the AC motor of the second elevator is rotated in the direction in which the car of the second elevator is lowered. An elevator apparatus characterized by that. Elevator apparatus in which a plurality of elevators that are moved up and down by an AC motor connected to an AC power source via an inverter are installed, and each of the elevators is moved up and down by a sheave that is rotationally driven by the AC motor. In the control method of
Driving torque of an AC motor that rotationally drives the sheave of the first elevator when the first elevator of the plurality of elevators installed in the plurality and the first elevator of the second elevator are operated at a low speed and heavy load for a short time. And a driving torque of an AC electric motor that rotationally drives the sheave of the second elevator.

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