JP2008037568A - Control system of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system of elevators capable of controlling a braking torque generated from a motor properly according to the load and speed of a car. <P>SOLUTION: In this control system of elevators, a car 3 and a counterweight 5 are driven by a rope 7 wrapped around the sheave 50 of a hoist, and a brake 60 mechanically stops the driving. The control system comprises synchronized first and second motors 19, 29 which drive the hoist and in which a permanent magnet is used for the field, first and second inverters 17, 27 driving the first and second motors 19, 29, respectively, a brake control part 62 releasing the brake 60 after the car 3 is stopped when the first and second inverters 17, 27 are stopped, and first and second switches S1, S2 shortcircuiting each of the phase terminals of the first and second permanent magnet synchronized motors 19, 29 through an impedance. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an elevator control system.

As described in Patent Document 1 below, a conventional elevator control system includes a permanent magnet synchronous motor using a permanent magnet as a field as a hoist, and short-circuits each phase terminal of the permanent magnet synchronous motor via an impedance. Control system for an elevator that uses a dynamic brake circuit, a capacitor for short-circuiting each phase terminal of the permanent magnet synchronous motor when the dynamic brake circuit is formed, and a drive circuit for each phase terminal of the permanent magnet synchronous motor And a switching device for switching to a capacitor.

According to such an elevator control system, in the emergency rescue operation of an elevator driven by a hoist using a permanent magnet motor, by inserting a capacitor in series with each phase winding in the motor dynamic brake circuit, Since the combined impedance of the inductance and the capacitor can be reduced at a specific rotational speed of the motor and the phase difference between the current flowing through the dynamic brake circuit and the induced voltage can be reduced, the braking torque can be increased at the specific rotational speed. can do.
WO2004-007333

However, although the elevator control system can increase the braking torque at the specific rotational speed, the braking torque is determined by the combined impedance of the motor, the inductance and the capacitor. For this reason, since the braking torque generated from the motor cannot be adjusted in multiple stages, there has been a problem that the braking torque cannot be appropriately controlled according to the load and speed of the car in the rescue operation of the car.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator control system that can appropriately control braking torque generated from a motor in accordance with the load, speed, etc. of a car.

An elevator control system according to a first aspect of the present invention is an elevator control system provided with a brake that mechanically stops driving while driving a car and a counterweight by a rope hung on a sheave of a hoisting machine. The first and second motors for driving the hoisting machine and using a permanent magnet as a field, and the first and second driving means for driving the first and second motors, respectively. The brake control means for releasing the brake after the first drive means and the second drive means are stopped and the car is stopped, and the phase terminals of the first and second permanent magnet synchronous motors are connected via impedance. And first and second switch means for short-circuiting.

The elevator control system according to the second aspect of the invention is characterized by comprising control means for closing at least one of the first and second switch means from being opened together with opening of the brake.

According to a third aspect of the present invention, there is provided an elevator control system comprising: a load detection unit that detects a load in the car; and the control unit includes a first unit that detects a load detected by the load detection detection unit when the load detected by the load detection unit is equal to or less than a predetermined reference load. The switch means or the second switch means is closed from the open state, and if the reference load is exceeded, the first switch means and the second switch means are closed from the open state.

According to a fourth aspect of the present invention, there is provided an elevator control system comprising speed detection means for detecting the speed of the car, and the control means includes first switch means if the speed detected by the speed detection means is equal to or lower than a predetermined reference speed. Alternatively, the second switch means is closed from the open state, and if the reference speed is exceeded, the first switch means and the second switch means are closed from the open state.

The first motor and the second motor in the elevator control system according to the fifth invention are arranged coaxially.

A hoisting machine in an elevator control system according to a sixth invention comprises a first hoisting machine driven by a first motor and a second hoisting machine driven by a second motor, wherein the first hoisting machine The first sheave of the upper machine and the second sheave of the second hoisting machine are characterized in that a rope for connecting the car and the counterweight is hung.

The 1st hoisting machine and the 2nd hoisting machine in the control system of the elevator concerning the 7th invention are connected with the car and the counterweight by the 1st rope and the 2nd rope, A first rope is hung on the first sheave, and a second rope is hung on the second sheave of the second hoisting machine.

According to the first aspect of the invention, the first and second motors that drive the hoisting machine and that drive the first and second motors of the synchronous type using a permanent magnet as the field, respectively, Each phase of the second drive means, the brake control means for releasing the brake after the first drive means and the second drive means are stopped and the car is stopped, and the first and second permanent magnet synchronous motors Since the first and second switch means for short-circuiting the terminals via the impedance are provided, the braking torque generated from the first motor and the second motor is stepped by controlling the opening and closing of the first and second switch means. There is an effect that can be controlled.

According to the second aspect of the invention, since the brake is released and the control means for closing at least one of the first and second switch means from the open state is provided, the braking torque is applied from the first motor or the like when the car descends. Is generated. Therefore, an increase in the speed of the car can be suppressed during the rescue operation.

According to the third aspect of the invention, the load detecting means for detecting the load in the car and the control means are configured such that the first switch means or the second detecting means is provided if the load detected by the load detecting means is equal to or less than a predetermined reference load. Since the first switch means and the second switch means are closed from the open state when the two switch means are closed from the open state and the reference load is exceeded, braking generated from the first motor or the second motor according to the load in the car The car can be braked by using torque or by using braking torque generated from the first and second motors. Therefore, there is an effect that the braking torque generated from the motor can be controlled appropriately according to the load in the car.

According to the fourth invention, the speed detecting means for detecting the speed of the car and the control means are arranged such that the first switch means or the second switch if the speed detected by the speed detecting means is equal to or lower than a predetermined reference speed. Since the first switch means and the second switch means are closed from the open state when the means is closed from the open state and the reference speed is exceeded, the braking torque generated from the first motor or the second motor is used according to the speed of the car. The car can be braked by using braking torque generated from the first and second motors. Therefore, there is an effect that the braking torque generated from the motor can be appropriately controlled according to the speed of the car.

According to the fifth, sixth, and seventh inventions, there is an effect that the invention can be applied to various elevator systems that are driven by the first motor and the second motor.

Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall view of an elevator control system showing an embodiment of the present invention, and FIG. 2 is an internal configuration diagram of the control device shown in FIG.
In FIG. 1, the elevator has a rope 7 with one end fixed to a car 3 and the other end fixed to a counterweight 5, and the rope 7 is hung on a sheave 50 of a hoisting machine. Are provided with a first motor 19 and a second motor 29 provided on the same axis, and a mechanical brake 60 for restraining and releasing the sheave 50. The sheave 50 of the hoisting machine is provided by the first and second motors 19 and 29. A brake control unit 62 that drives and controls the mechanical brake 60 is provided.

In FIG. 1, the elevator includes a control device 10 that drives a first motor 19 and a second motor 29, an encoder 20 that detects a rotational speed of the first motor 19 and generates a detected speed value Vs, and a car. 3 and a load detector 4 for detecting a load within 3, and a speed detection value and a load detection value are input to the main control unit 50, and an output of the main control unit 50 is input to the control device 10. ing.

In FIG. 2, the control device 10 includes a converter 14 in which a three-phase AC power supply 11 converts an AC voltage into a DC voltage via a switch 12, a smoothing capacitor 15 connected to the output of the converter 14, and a parallel to the smoothing capacitor 15. A first inverter 17 and a second inverter 27 that are connected to each other and convert a DC voltage into an AC of a variable frequency are provided. A first resistor R1 connected in a three-phase star is connected to a three-phase star at the output of the first inverter 17. The output of the second inverter 27 is connected to a three-phase star, and a second resistor R2 (R1> R2) having a resistance value lower than that of the first resistor R1 is connected to the output of the second inverter 27. They are connected via a three-phase second switch S2.

In the elevator, the first inverter 17 and the second inverter 27 drive the first motor 19 and the second motor 29, respectively, and move the counterweight 5 and the car 3 up and down by the rope 7 through the sheave 50 of the hoisting machine. It is formed as follows.

In FIG. 1, the main control unit 50 stores first to third speed reference values V1n, V2n, V3n having a relationship of first speed reference value V1n <second speed reference value V2n <third speed reference value V3n. And a speed determination unit 52 for determining whether or not the detected speed value Vs from the encoder 20 exceeds the first to third speed reference values V1n, V2n, V3n, and the detected speed value Vs is the first speed reference. When the value V1n is exceeded, the first switch S1 is turned on, the regenerative current generated from the first motor 19 flows through the first resistor R1, and the first brake torque τ1 is generated as shown in FIG. When the value Vs exceeds the second speed reference value V2n, the second switch S2 is turned on, and the regenerative current generated from the second motor 29 flows through the second resistor R2, and the second brake torque as shown in FIG. τ2 is generated and detected When the degree value Vs exceeds the third speed reference value V3n, the first and second switches S1 and S2 are turned on, and the respective regenerative currents generated from the first and second motors 19 and 29 become the first resistor R1, the second The third brake torque τ3 is generated by adding the first brake torque τ1 and the second brake torque τ2 through the two resistors R2.

The main control unit 50 stores first to third load reference values W1n, W2n, W3n having a relationship of first load reference value W1n <second load reference value W2n <third load reference value W3n, A load determination unit 52 for determining whether or not the detected weight value Ws from the load detector 20 exceeds the first to third load reference values W1n, W2n, and W3n is provided, and the detected weight value Ws is the first load reference value W1n. Is exceeded, the first switch S1 is turned on, the regenerative current generated from the first motor 19 flows through the first resistor R1, the first brake torque τ1 is generated, and the detected load value Ws becomes the second load reference value W2n. Is exceeded, the second switch S2 is turned on, the regenerative current generated from the second motor 29 flows through the second resistor R2, the second brake torque τ2 is generated, and the detected load value Ws becomes the third load reference value W3n. The first and beyond When the second switches S1 and S2 are turned on, the regenerative currents generated from the first and second motors 19 and 29 flow through the first resistor R1 and the second resistor R2, respectively, and the first brake torque τ1 and the second brake The third brake torque τ3 obtained by adding the torque τ2 is generated.

The operation by the car load detection in the elevator control system configured as described above will be described with reference to FIGS. FIG. 4 is a flowchart showing the operation of the control system based on the car load detection.
<Cage load detection>
Now, the control device 10 determines that the first and second inverters 17 and 27 are stopped, the car 3 is stopped from the detection position of the encoder 20, and the car 3 is stopped on an intermediate floor outside the door zone. Then (step S101), the car 3 starts to rise or fall due to the load in the car 3. The detected load value Ws from the load detector 4 is detected (step S105), and the load determination unit 54 determines whether or not the detected load value Ws exceeds the first to third reference load values W1n, W2n, and W3n. (Step S107).

If the detected load value Ws exceeds the first reference load value W1n (step S119), the main control unit 50 keeps the first switch S1 on and travels while braking the car 3 with the first brake torque τ1. (Step S121), the above steps S113 and S115 are executed, and the process ends.
If the detected load value Ws exceeds the second reference load value W2n (step S129), the main control unit 50 keeps the second switch S2 on and brakes the car 3 with the second brake torque τ2. (Step S131), the above (steps S113 and S115 are executed), and the process ends.
Further, when the detected load value Ws exceeds the third reference load value W3n (step S139), the main control unit 50 keeps the first and second switches S1 and S2 turned on and causes the car 3 to move to the third brake. The vehicle is run while braking with torque τ3 (step S141), and the above steps S113 and S115 are executed and the process is terminated.

Next, the operation by the car load detection in the elevator control system configured as described above will be described with reference to FIGS. 1 to 3 and FIG. FIG. 5 is a flowchart showing the operation of the control system by detecting the speed of the car.
<Cage speed detection>
Now, the control device 10 determines from the detection position of the encoder 20 that the first and second inverters 17 and 27 are stopped and the car 3 is stopped, and the car 3 is stopped at an intermediate floor outside the door zone. Then (step S201), the brake control unit 62 releases the brake 60, and the main control unit 50 turns on the first switch S1 to generate the first brake torque τ1 while braking the first motor 19. Ascending or descending is started by the load in the car 3 (step S203). The detection speed value Vs from the encoder 20 is detected (step S205), and the speed determination unit 52 determines whether or not the detection speed value Vs exceeds the first reference speed value V1n (step S207), and the detection speed value Vs. Exceeds the first reference speed value V1n, the main control unit 50 keeps the first switch S1 on (step S209), and the speed determination unit 52 determines that the detected speed value Vs exceeds the second reference speed value V2n. The main control unit 50 turns on the second switch S2 to generate the second brake torque τ2 from the second motor 29 and brakes the second motor 29 if it has exceeded (step S213). However, it rises or falls due to the load in the car 3 (step S217).

The speed determination unit 52 determines whether or not the detected speed value Vs exceeds the third reference speed value V3n (step S217). If the detected speed value Vs exceeds the third reference speed value V3n, the main control unit 50 controls the first and second switches S1 and S2 Is turned on and the third brake torque τ3 is generated for braking, and the vehicle 3 is raised or lowered by the load in the car 3 (step S219). Steps S221 and S223 are executed, and the process ends.
According to the elevator control system according to such an embodiment, the braking torque generated from the motor can be controlled appropriately in accordance with the speed of the car, so that the car can be rescued quickly while suppressing the speed of the car.

Embodiment 2. FIG.
In the first embodiment, the control system has one hoisting machine. However, in the present embodiment, an example in which the hoisting machine can be applied to two control systems will be described with reference to FIG. FIG. 6 shows another embodiment, and is an overall configuration diagram of a single rope type elevator system that drives a car with two hoisting machines.
In FIG. 6, the elevator system includes a first hoisting machine sheave 50 a driven by a first motor 19 and a second hoisting machine sheave 50 b driven by a second motor 29. The first sheave 50a of the machine and the second sheave 50b of the second hoisting machine are hung with the rope 7 that joins the car 3 and the counterweight 5 together. The first sheave 50a is restrained / released by the first brake 60a, and the second sheave 50b is restrained / released by the second brake 60b.
Even in such an elevator system, the same operations and effects as those of the first embodiment are obtained.

Embodiment 3 FIG.
In the present embodiment, as in the second embodiment, an example that can be applied to a control system having two hoisting machines will be described with reference to FIG. FIG. 7 shows another embodiment, and is an overall configuration diagram of a two-rope type elevator system that drives a car with two hoisting machines.
In FIG. 7, the elevator system has a first rope 7a and a second rope 7b each having one end fixed to the car 3 and a counterweight 5 fixed to the other end, and the first rope 7a. Is hung on the sheave 50a of the first hoisting machine and the first return wheel 52a, and the second rope 7b is hung on the sheave 50b of the second hoisting machine and the second return wheel 52a.
Even in such an elevator system, the same operations and effects as those of the first embodiment are obtained.

  The present invention can be applied to an elevator control system.

1 is an overall view of an elevator control system showing an embodiment of the present invention. It is a block diagram of the control apparatus of the elevator shown in FIG. FIG. 3 is a curve diagram of brake torque versus speed of the first and second motors shown in FIG. 1. It is a flowchart which shows the operation | movement by the cage load detection in the control system of the elevator which shows one embodiment of this invention. It is a flowchart which shows the operation | movement by the speed detection of the cage | basket | car in the control system of the elevator which shows one embodiment of this invention. It is a whole lineblock diagram of the elevator system of the one rope type which drives a car with two hoisting machines by other embodiments of the present invention. FIG. 5 is an overall configuration diagram of a two-rope type elevator system that drives a car with two hoisting machines according to another embodiment of the present invention.

Explanation of symbols

  3 cage, 4 load detector, 5 counterweight, 7 rope, 19 first motor, 20 encoder, 29 second motor, 50 sheave, 50a first sheave, 50b second sheave, 60 brake, S1 first switch, S2 Second switch, R1 first resistor, R2 second resistor.

Claims (7)

In an elevator control system provided with a brake and a brake that mechanically stops the drive while driving the car and the counterweight by a rope hung on the sheave of the hoisting machine,
While driving the hoisting machine, synchronous first and second motors using permanent magnets for the field,
First driving means and second driving means for respectively driving the first and second motors;
Brake control means for releasing the brake after the first drive means and the second drive means are stopped and the car is stopped;
First and second switch means for short-circuiting each phase terminal of the first and second permanent magnet synchronous motors via impedance;
An elevator control system comprising: Control means for closing at least one of the first and second switch means from being released together with releasing the brake,
The elevator control system according to claim 1, further comprising an elevator control system. Load detecting means for detecting a load in the car;
The control means closes the first switch means or the second switch means from an open state if the detection load of the load detection detection means is less than a predetermined reference load, and the first switch means if it exceeds the reference load. And closing the second switch means from open,
The elevator control system according to claim 2. Speed detecting means for detecting the speed of the car;
The control means closes the first switch means or the second switch means from the open state if the detection speed of the speed detection means is equal to or lower than a predetermined reference speed, and if the detection speed exceeds the reference speed, the first switch means and Closing the second switch means from open,
The elevator control system according to claim 2, The first motor and the second motor are arranged coaxially.
The elevator control device according to any one of claims 1 to 4, wherein The hoisting machine comprises a first hoisting machine driven by the first motor and a second hoisting machine driven by the second motor,
The first sheave of the first hoisting machine and the second sheave of the second hoisting machine are hung with a rope that joins the car and the counterweight.
The elevator control device according to any one of claims 1 to 4, wherein The first hoisting machine and the second hoisting machine are combined with a car and a counterweight with a first rope and a second rope,
The first rope is hung on the first sheave of the first hoisting machine, and the second rope is hung on the second sheave of the second hoisting machine,
The elevator control device according to claim 1.

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